{"id":11933,"date":"2024-04-16T10:54:46","date_gmt":"2024-04-16T15:54:46","guid":{"rendered":"https:\/\/optimas.com\/?page_id=11933"},"modified":"2024-11-22T15:21:05","modified_gmt":"2024-11-22T21:21:05","slug":"bsw-bsf-thread-dimensions-chart","status":"publish","type":"page","link":"https:\/\/optimas.com\/en_gb\/technical-resources\/bsw-bsf-thread-dimensions-chart\/","title":{"rendered":"BSW\/BSF Thread Dimensions Chart"},"content":{"rendered":"<p><div class=\"fusion-fullwidth fullwidth-box fusion-builder-row-1 fusion-flex-container has-pattern-background has-mask-background nonhundred-percent-fullwidth non-hundred-percent-height-scrolling max\" style=\"--awb-border-radius-top-left:0px;--awb-border-radius-top-right:0px;--awb-border-radius-bottom-right:0px;--awb-border-radius-bottom-left:0px;--awb-padding-right:0px;--awb-padding-left:0px;--awb-flex-wrap:wrap;\" ><div class=\"fusion-builder-row fusion-row fusion-flex-align-items-flex-start fusion-flex-content-wrap\" style=\"max-width:104%;margin-left: calc(-4% \/ 2 );margin-right: calc(-4% \/ 2 );\"><div class=\"fusion-layout-column fusion_builder_column fusion-builder-column-0 fusion_builder_column_1_1 1_1 fusion-flex-column max1200\" style=\"--awb-bg-size:cover;--awb-width-large:100%;--awb-margin-top-large:0px;--awb-spacing-right-large:1.92%;--awb-margin-bottom-large:20px;--awb-spacing-left-large:1.92%;--awb-width-medium:100%;--awb-order-medium:0;--awb-spacing-right-medium:1.92%;--awb-spacing-left-medium:1.92%;--awb-width-small:100%;--awb-order-small:0;--awb-spacing-right-small:1.92%;--awb-spacing-left-small:1.92%;\"><div class=\"fusion-column-wrapper fusion-column-has-shadow fusion-flex-justify-content-flex-start fusion-content-layout-column\"><nav class=\"fusion-breadcrumbs fusion-breadcrumbs-1\" style=\"--awb-alignment:left;--awb-font-size:16;--awb-text-color:#e87722;--awb-breadcrumb-sep:&#039;\/&#039;;text-align:left;\" aria-label=\"Breadcrumb\"><ol class=\"awb-breadcrumb-list\"><li class=\"fusion-breadcrumb-item awb-breadcrumb-sep awb-home\" ><a href=\"https:\/\/optimas.com\/en_gb\/\" class=\"fusion-breadcrumb-link\"><span >Home<\/span><\/a><\/li><\/ol><\/nav><\/div><\/div><\/div><\/div><div class=\"fusion-fullwidth fullwidth-box fusion-builder-row-2 fusion-flex-container has-pattern-background has-mask-background nonhundred-percent-fullwidth non-hundred-percent-height-scrolling\" style=\"--awb-border-radius-top-left:0px;--awb-border-radius-top-right:0px;--awb-border-radius-bottom-right:0px;--awb-border-radius-bottom-left:0px;--awb-padding-right:0px;--awb-padding-left:0px;--awb-flex-wrap:wrap;\" ><div class=\"fusion-builder-row fusion-row fusion-flex-align-items-flex-start fusion-flex-content-wrap\" style=\"max-width:104%;margin-left: calc(-4% \/ 2 );margin-right: calc(-4% \/ 2 );\"><div class=\"fusion-layout-column fusion_builder_column fusion-builder-column-1 fusion_builder_column_1_1 1_1 fusion-flex-column max1200\" style=\"--awb-bg-size:cover;--awb-width-large:100%;--awb-margin-top-large:0px;--awb-spacing-right-large:1.92%;--awb-margin-bottom-large:20px;--awb-spacing-left-large:1.92%;--awb-width-medium:100%;--awb-order-medium:0;--awb-spacing-right-medium:1.92%;--awb-spacing-left-medium:1.92%;--awb-width-small:100%;--awb-order-small:0;--awb-spacing-right-small:1.92%;--awb-spacing-left-small:1.92%;\"><div class=\"fusion-column-wrapper fusion-column-has-shadow fusion-flex-justify-content-flex-start fusion-content-layout-column\"><div class=\"fusion-builder-row fusion-builder-row-inner fusion-row fusion-flex-align-items-flex-start fusion-flex-content-wrap\" style=\"--awb-flex-grow:0;--awb-flex-grow-medium:0;--awb-flex-grow-small:0;--awb-flex-shrink:0;--awb-flex-shrink-medium:0;--awb-flex-shrink-small:0;width:104% !important;max-width:104% !important;margin-left: calc(-4% \/ 2 );margin-right: calc(-4% \/ 2 );\"><div class=\"fusion-layout-column fusion_builder_column_inner fusion-builder-nested-column-0 fusion_builder_column_inner_2_5 2_5 fusion-flex-column\" style=\"--awb-bg-size:cover;--awb-width-large:40%;--awb-margin-top-large:0px;--awb-spacing-right-large:4.8%;--awb-margin-bottom-large:0px;--awb-spacing-left-large:4.8%;--awb-width-medium:100%;--awb-order-medium:0;--awb-spacing-right-medium:1.92%;--awb-spacing-left-medium:1.92%;--awb-width-small:100%;--awb-order-small:0;--awb-spacing-right-small:1.92%;--awb-spacing-left-small:1.92%;\"><div class=\"fusion-column-wrapper fusion-column-has-shadow fusion-flex-justify-content-flex-start fusion-content-layout-column\"><div class=\"fusion-image-element\" style=\"--awb-caption-title-font-family:var(--h2_typography-font-family);--awb-caption-title-font-weight:var(--h2_typography-font-weight);--awb-caption-title-font-style:var(--h2_typography-font-style);--awb-caption-title-size:var(--h2_typography-font-size);--awb-caption-title-transform:var(--h2_typography-text-transform);--awb-caption-title-line-height:var(--h2_typography-line-height);--awb-caption-title-letter-spacing:var(--h2_typography-letter-spacing);\"><span class=\"fusion-imageframe imageframe-none imageframe-1 hover-type-none\"><img decoding=\"async\" width=\"573\" height=\"436\" title=\"standard\" src=\"https:\/\/optimas.com\/wp-content\/uploads\/2024\/04\/standard.jpg\" alt class=\"img-responsive wp-image-11706\" srcset=\"https:\/\/optimas.com\/wp-content\/uploads\/2024\/04\/standard-200x152.jpg 200w, https:\/\/optimas.com\/wp-content\/uploads\/2024\/04\/standard-400x304.jpg 400w, https:\/\/optimas.com\/wp-content\/uploads\/2024\/04\/standard.jpg 573w\" sizes=\"(max-width: 1024px) 100vw, (max-width: 640px) 100vw, 573px\" \/><\/span><\/div><\/div><\/div><div class=\"fusion-layout-column fusion_builder_column_inner fusion-builder-nested-column-1 fusion_builder_column_inner_3_5 3_5 fusion-flex-column fusion-flex-align-self-center\" style=\"--awb-bg-size:cover;--awb-width-large:60%;--awb-margin-top-large:0px;--awb-spacing-right-large:3.2%;--awb-margin-bottom-large:0px;--awb-spacing-left-large:3.2%;--awb-width-medium:100%;--awb-order-medium:0;--awb-spacing-right-medium:1.92%;--awb-spacing-left-medium:1.92%;--awb-width-small:100%;--awb-order-small:0;--awb-spacing-right-small:1.92%;--awb-spacing-left-small:1.92%;\"><div class=\"fusion-column-wrapper fusion-column-has-shadow fusion-flex-justify-content-flex-start fusion-content-layout-column\"><div class=\"fusion-text fusion-text-1\"><div class=\"fusion-text fusion-text-1\">\n<h2>BSW and BSF Thread Dimensions Chart<\/h2>\n<\/div>\n<div class=\"fusion-text fusion-text-2\">\n<p>Optimas are a full-service supply chain and manufacturing solutions provider. Before you design your next product or make updates to an existing product, consider partnering with Optimas to take advantage of our many capabilities.<\/p>\n<\/div>\n<\/div><div class=\"fusion-separator fusion-full-width-sep\" style=\"align-self: center;margin-left: auto;margin-right: auto;margin-top:20px;margin-bottom:20px;width:100%;\"><\/div><div class=\"fusion-text fusion-text-2\"><p><a class=\"linkOrangeButton\" href=\"https:\/\/optimas.com\/en_gb\/contact\/\">SPEAK TO AN EXPERT<\/a><\/p>\n<\/div><\/div><\/div><\/div><\/div><\/div><\/div><\/div><div class=\"fusion-fullwidth fullwidth-box fusion-builder-row-3 fusion-flex-container has-pattern-background has-mask-background nonhundred-percent-fullwidth non-hundred-percent-height-scrolling\" style=\"--awb-border-radius-top-left:0px;--awb-border-radius-top-right:0px;--awb-border-radius-bottom-right:0px;--awb-border-radius-bottom-left:0px;--awb-flex-wrap:wrap;\" ><div class=\"fusion-builder-row fusion-row fusion-flex-align-items-flex-start fusion-flex-content-wrap\" style=\"max-width:104%;margin-left: calc(-4% \/ 2 );margin-right: calc(-4% \/ 2 );\"><div class=\"fusion-layout-column fusion_builder_column fusion-builder-column-2 fusion_builder_column_1_1 1_1 fusion-flex-column\" style=\"--awb-bg-size:cover;--awb-width-large:100%;--awb-margin-top-large:0px;--awb-spacing-right-large:1.92%;--awb-margin-bottom-large:20px;--awb-spacing-left-large:1.92%;--awb-width-medium:100%;--awb-order-medium:0;--awb-spacing-right-medium:1.92%;--awb-spacing-left-medium:1.92%;--awb-width-small:100%;--awb-order-small:0;--awb-spacing-right-small:1.92%;--awb-spacing-left-small:1.92%;\"><div class=\"fusion-column-wrapper fusion-column-has-shadow fusion-flex-justify-content-flex-start fusion-content-layout-column\"><div class=\"fusion-separator fusion-full-width-sep\" style=\"align-self: center;margin-left: auto;margin-right: auto;width:100%;\"><div class=\"fusion-separator-border sep-single sep-solid\" style=\"--awb-height:20px;--awb-amount:20px;border-color:#e0dede;border-top-width:1px;\"><\/div><\/div><\/div><\/div><\/div><\/div><div class=\"fusion-fullwidth fullwidth-box fusion-builder-row-4 fusion-flex-container has-pattern-background has-mask-background nonhundred-percent-fullwidth non-hundred-percent-height-scrolling\" style=\"--awb-border-radius-top-left:0px;--awb-border-radius-top-right:0px;--awb-border-radius-bottom-right:0px;--awb-border-radius-bottom-left:0px;--awb-flex-wrap:wrap;\" ><div class=\"fusion-builder-row fusion-row fusion-flex-align-items-flex-start fusion-flex-content-wrap\" style=\"max-width:104%;margin-left: calc(-4% \/ 2 );margin-right: calc(-4% \/ 2 );\"><div class=\"fusion-layout-column fusion_builder_column fusion-builder-column-3 fusion_builder_column_1_1 1_1 fusion-flex-column max1200\" style=\"--awb-bg-size:cover;--awb-width-large:100%;--awb-margin-top-large:0px;--awb-spacing-right-large:1.92%;--awb-margin-bottom-large:20px;--awb-spacing-left-large:1.92%;--awb-width-medium:100%;--awb-order-medium:0;--awb-spacing-right-medium:1.92%;--awb-spacing-left-medium:1.92%;--awb-width-small:100%;--awb-order-small:0;--awb-spacing-right-small:1.92%;--awb-spacing-left-small:1.92%;\"><div class=\"fusion-column-wrapper fusion-column-has-shadow fusion-flex-justify-content-flex-start fusion-content-layout-column\"><div class=\"fusion-separator fusion-full-width-sep\" style=\"align-self: center;margin-left: auto;margin-right: auto;margin-top:10px;margin-bottom:10px;width:100%;\"><\/div><div class=\"fusion-text fusion-text-3\"><div class=\"fusion-text fusion-text-4\">\n<h2>British Standard Whitworth (BSW)<\/h2>\n<p>BSW is an imperial-unit-based screw thread standard, devised and specified by Joseph Whitworth in 1841 and later adopted as a British Standard. It was the world\u2019s first national screw thread standard, and is the basis for many other standards, such as BSF, BSP, BSCon, and BSCopper.<\/p>\n<\/div>\n<div class=\"fusion-separator fusion-full-width-sep\"><\/div>\n<div class=\"fusion-text fusion-text-5\">\n<h2>British Standard Fine (BSF)<\/h2>\n<p>British Standard Fine (BSF) is a screw thread form, as a fine-pitch alternative to British Standard Whitworth (BSW) thread. It was used for steel bolts and nuts on much British machinery, including cars, prior to adoption of Unified, and later Metric, standards. For highly stressed conditions, especially in motorcycles, a finer thread, British Standard Cycle (BSC), was used as well.<\/p>\n<\/div>\n<div class=\"fusion-separator fusion-full-width-sep\"><\/div>\n<div class=\"fusion-text fusion-text-6\">\n<p>Tolerances should be considered when designing products.\u00a0 Values related to drilling and tapping can differ significantly depending on factors such as operating temperature and material.<\/p>\n<\/div>\n<div class=\"fusion-separator fusion-full-width-sep\"><\/div>\n<div class=\"fusion-text fusion-text-7\">\n<p>Optimas are a full-service supply chain and manufacturing solutions provider.\u00a0 \u00a0Before you design your next product or make updates to an existing product, consider partnering with Optimas to take advantage of our many capabilities.<\/p>\n<\/div>\n<\/div><div class=\"fusion-separator fusion-full-width-sep\" style=\"align-self: center;margin-left: auto;margin-right: auto;margin-top:10px;margin-bottom:10px;width:100%;\"><\/div><div class=\"fusion-text fusion-text-4\"><p style=\"font-size: 18px;\" data-fusion-font=\"true\">For guidance only.<\/p>\n<\/div><\/div><\/div><\/div><\/div><div class=\"fusion-fullwidth fullwidth-box fusion-builder-row-5 fusion-flex-container has-pattern-background has-mask-background nonhundred-percent-fullwidth non-hundred-percent-height-scrolling overflow-x :scroll;\" style=\"--awb-border-radius-top-left:0px;--awb-border-radius-top-right:0px;--awb-border-radius-bottom-right:0px;--awb-border-radius-bottom-left:0px;--awb-flex-wrap:wrap;\" ><div class=\"fusion-builder-row fusion-row fusion-flex-align-items-flex-start fusion-flex-content-wrap\" style=\"max-width:104%;margin-left: calc(-4% \/ 2 );margin-right: calc(-4% \/ 2 );\"><div class=\"fusion-layout-column fusion_builder_column fusion-builder-column-4 fusion_builder_column_1_1 1_1 fusion-flex-column max1200\" style=\"--awb-bg-size:cover;--awb-width-large:100%;--awb-margin-top-large:0px;--awb-spacing-right-large:1.92%;--awb-margin-bottom-large:20px;--awb-spacing-left-large:1.92%;--awb-width-medium:100%;--awb-order-medium:0;--awb-spacing-right-medium:1.92%;--awb-spacing-left-medium:1.92%;--awb-width-small:100%;--awb-order-small:0;--awb-spacing-right-small:1.92%;--awb-spacing-left-small:1.92%;\"><div class=\"fusion-column-wrapper fusion-column-has-shadow fusion-flex-justify-content-flex-start fusion-content-layout-column\"><div class=\"fusion-tabs fusion-tabs-1 classic nav-not-justified overflow-x: scroll; horizontal-tabs icon-position-left mobile-mode-accordion\" style=\"--awb-title-border-radius-top-left:0px;--awb-title-border-radius-top-right:0px;--awb-title-border-radius-bottom-right:0px;--awb-title-border-radius-bottom-left:0px;--awb-alignment:start;--awb-inactive-color:#ebeaea;--awb-background-color:#ffffff;--awb-border-color:#ebeaea;--awb-active-border-color:#ee7724;\"><div class=\"nav\"><ul class=\"nav-tabs\" role=\"tablist\" aria-orientation=\"horizontal\"><li class=\"active\" role=\"presentation\"><a class=\"tab-link\" data-toggle=\"tab\" role=\"tab\" aria-controls=\"tab-3fc7befb2be53241a13\" aria-selected=\"true\" tabindex=\"0\" id=\"fusion-tab-3fc7befb2be53241a13\" href=\"#tab-3fc7befb2be53241a13\"><h4 class=\"fusion-tab-heading\">BSW<\/h4><\/a><\/li><li  role=\"presentation\"><a class=\"tab-link\" data-toggle=\"tab\" role=\"tab\" aria-controls=\"tab-91c1031a76ceccd9245\" aria-selected=\"false\" tabindex=\"-1\" id=\"fusion-tab-91c1031a76ceccd9245\" href=\"#tab-91c1031a76ceccd9245\"><h4 class=\"fusion-tab-heading\">BSF<\/h4><\/a><\/li><\/ul><\/div><div class=\"tab-content\"><div class=\"nav fusion-mobile-tab-nav\"><ul class=\"nav-tabs\" role=\"tablist\" aria-orientation=\"horizontal\"><li class=\"active\" role=\"presentation\"><a class=\"tab-link\" data-toggle=\"tab\" role=\"tab\" aria-controls=\"tab-3fc7befb2be53241a13\" aria-selected=\"true\" tabindex=\"0\" id=\"mobile-fusion-tab-3fc7befb2be53241a13\" href=\"#tab-3fc7befb2be53241a13\"><h4 class=\"fusion-tab-heading\">BSW<\/h4><\/a><\/li><\/ul><\/div><div class=\"tab-pane fade fusion-clearfix in active\" role=\"tabpanel\" tabindex=\"0\" aria-labelledby=\"fusion-tab-3fc7befb2be53241a13\" id=\"tab-3fc7befb2be53241a13\">\n<table id=\"tablepress-18\" class=\"tablepress tablepress-id-18\">\n<thead>\n<tr class=\"row-1\">\n\t<th class=\"column-1\">Thread Size<\/th><th class=\"column-2\">Threads per Inch<\/th><th colspan=\"2\" class=\"column-3\">External Major Diameter<\/th><th colspan=\"2\" class=\"column-5\">Internal Minor Diameter<\/th><th colspan=\"2\" class=\"column-7\">Drill Size Clearance Hole<\/th><th colspan=\"2\" class=\"column-9\">Drill Size Tapped Hole<\/th>\n<\/tr>\n<\/thead>\n<tbody class=\"row-striping row-hover\">\n<tr class=\"row-2\">\n\t<td class=\"column-1\"><b>BSW 55<\/b><\/td><td class=\"column-2\"><\/td><td class=\"column-3\"><b>INCH<\/b><\/td><td class=\"column-4\"><b>MM<\/b><\/td><td class=\"column-5\"><b>INCH<\/b><\/td><td class=\"column-6\"><b>MM<\/b><\/td><td class=\"column-7\"><b>INCH<\/b><\/td><td class=\"column-8\"><b>MM<\/b><\/td><td class=\"column-9\"><b>INCH<\/b><\/td><td class=\"column-10\"><b>MM<\/b><\/td>\n<\/tr>\n<tr class=\"row-3\">\n\t<td class=\"column-1\">1\/16<\/td><td class=\"column-2\">60<\/td><td class=\"column-3\">0.0620<\/td><td class=\"column-4\">1.59<\/td><td class=\"column-5\">0.0410<\/td><td class=\"column-6\">1.05<\/td><td class=\"column-7\"><\/td><td class=\"column-8\">1.99<\/td><td class=\"column-9\"><\/td><td class=\"column-10\">1.15<\/td>\n<\/tr>\n<tr class=\"row-4\">\n\t<td class=\"column-1\">3\/32<\/td><td class=\"column-2\">48<\/td><td class=\"column-3\">0.0940<\/td><td class=\"column-4\">2.38<\/td><td class=\"column-5\">0.0670<\/td><td class=\"column-6\">1.70<\/td><td class=\"column-7\"><\/td><td class=\"column-8\">2.67<\/td><td class=\"column-9\"><\/td><td class=\"column-10\">1.90<\/td>\n<\/tr>\n<tr class=\"row-5\">\n\t<td class=\"column-1\">1\/8<\/td><td class=\"column-2\">40<\/td><td class=\"column-3\">0.1250<\/td><td class=\"column-4\">3.18<\/td><td class=\"column-5\">0.0930<\/td><td class=\"column-6\">2.36<\/td><td class=\"column-7\">9\/64<\/td><td class=\"column-8\">3.57<\/td><td class=\"column-9\"># 38<\/td><td class=\"column-10\">2.60<\/td>\n<\/tr>\n<tr class=\"row-6\">\n\t<td class=\"column-1\">5\/32<\/td><td class=\"column-2\">32<\/td><td class=\"column-3\">0.1560<\/td><td class=\"column-4\">3.97<\/td><td class=\"column-5\">0.1160<\/td><td class=\"column-6\">2.95<\/td><td class=\"column-7\">11\/64<\/td><td class=\"column-8\">4.37<\/td><td class=\"column-9\">1\/8<\/td><td class=\"column-10\">3.20<\/td>\n<\/tr>\n<tr class=\"row-7\">\n\t<td class=\"column-1\">3\/16<\/td><td class=\"column-2\">24<\/td><td class=\"column-3\">0.1870<\/td><td class=\"column-4\">4.75<\/td><td class=\"column-5\">0.1340<\/td><td class=\"column-6\">3.40<\/td><td class=\"column-7\">13\/64<\/td><td class=\"column-8\">5.16<\/td><td class=\"column-9\"># 27<\/td><td class=\"column-10\">3.70<\/td>\n<\/tr>\n<tr class=\"row-8\">\n\t<td class=\"column-1\">7\/32<\/td><td class=\"column-2\">24<\/td><td class=\"column-3\">0.2190<\/td><td class=\"column-4\">5.60<\/td><td class=\"column-5\">0.1660<\/td><td class=\"column-6\">4.22<\/td><td class=\"column-7\">15\/64<\/td><td class=\"column-8\">5.95<\/td><td class=\"column-9\"># 19<\/td><td class=\"column-10\">4.30<\/td>\n<\/tr>\n<tr class=\"row-9\">\n\t<td class=\"column-1\">1\/4<\/td><td class=\"column-2\">20<\/td><td class=\"column-3\">0.2500<\/td><td class=\"column-4\">6.35<\/td><td class=\"column-5\">0.1860<\/td><td class=\"column-6\">4.72<\/td><td class=\"column-7\">17\/64<\/td><td class=\"column-8\">6.75<\/td><td class=\"column-9\"># 9<\/td><td class=\"column-10\">5.00<\/td>\n<\/tr>\n<tr class=\"row-10\">\n\t<td class=\"column-1\">5\/16<\/td><td class=\"column-2\">18<\/td><td class=\"column-3\">0.3120<\/td><td class=\"column-4\">7.92<\/td><td class=\"column-5\">0.2410<\/td><td class=\"column-6\">6.12<\/td><td class=\"column-7\">21\/64<\/td><td class=\"column-8\">8.33<\/td><td class=\"column-9\">1\/4<\/td><td class=\"column-10\">6.40<\/td>\n<\/tr>\n<tr class=\"row-11\">\n\t<td class=\"column-1\">3\/8<\/td><td class=\"column-2\">16<\/td><td class=\"column-3\">0.3750<\/td><td class=\"column-4\">9.53<\/td><td class=\"column-5\">0.2950<\/td><td class=\"column-6\">7.49<\/td><td class=\"column-7\">25\/64<\/td><td class=\"column-8\">9.92<\/td><td class=\"column-9\">5\/16<\/td><td class=\"column-10\">8.00<\/td>\n<\/tr>\n<tr class=\"row-12\">\n\t<td class=\"column-1\">7\/16<\/td><td class=\"column-2\">14<\/td><td class=\"column-3\">0.4370<\/td><td class=\"column-4\">11.10<\/td><td class=\"column-5\">0.3460<\/td><td class=\"column-6\">8.79<\/td><td class=\"column-7\">29\/64<\/td><td class=\"column-8\">11.51<\/td><td class=\"column-9\">U<\/td><td class=\"column-10\">9.40<\/td>\n<\/tr>\n<tr class=\"row-13\">\n\t<td class=\"column-1\">1\/2<\/td><td class=\"column-2\">12<\/td><td class=\"column-3\">0.5000<\/td><td class=\"column-4\">12.70<\/td><td class=\"column-5\">0.3930<\/td><td class=\"column-6\">9.98<\/td><td class=\"column-7\">17\/32<\/td><td class=\"column-8\">13.49<\/td><td class=\"column-9\">27\/64<\/td><td class=\"column-10\">10.80<\/td>\n<\/tr>\n<tr class=\"row-14\">\n\t<td class=\"column-1\">9\/16<\/td><td class=\"column-2\">12<\/td><td class=\"column-3\">0.5630<\/td><td class=\"column-4\">14.29<\/td><td class=\"column-5\">0.4560<\/td><td class=\"column-6\">11.58<\/td><td class=\"column-7\">19\/32<\/td><td class=\"column-8\">15.08<\/td><td class=\"column-9\">15\/32<\/td><td class=\"column-10\">12.00<\/td>\n<\/tr>\n<tr class=\"row-15\">\n\t<td class=\"column-1\">5\/8<\/td><td class=\"column-2\">11<\/td><td class=\"column-3\">0.6250<\/td><td class=\"column-4\">15.88<\/td><td class=\"column-5\">0.5090<\/td><td class=\"column-6\">12.93<\/td><td class=\"column-7\">21\/32<\/td><td class=\"column-8\">16.67<\/td><td class=\"column-9\">17\/32<\/td><td class=\"column-10\">13.50<\/td>\n<\/tr>\n<tr class=\"row-16\">\n\t<td class=\"column-1\">11\/16<\/td><td class=\"column-2\">11<\/td><td class=\"column-3\">0.6880<\/td><td class=\"column-4\">17.48<\/td><td class=\"column-5\">0.5710<\/td><td class=\"column-6\">14.50<\/td><td class=\"column-7\"><\/td><td class=\"column-8\">17.75<\/td><td class=\"column-9\"><\/td><td class=\"column-10\">15.00<\/td>\n<\/tr>\n<tr class=\"row-17\">\n\t<td class=\"column-1\">3\/4<\/td><td class=\"column-2\">10<\/td><td class=\"column-3\">0.7500<\/td><td class=\"column-4\">19.05<\/td><td class=\"column-5\">0.6220<\/td><td class=\"column-6\">15.80<\/td><td class=\"column-7\">25\/32<\/td><td class=\"column-8\">19.84<\/td><td class=\"column-9\">21\/32<\/td><td class=\"column-10\">17.00<\/td>\n<\/tr>\n<tr class=\"row-18\">\n\t<td class=\"column-1\">13\/16<\/td><td class=\"column-2\">10<\/td><td class=\"column-3\">0.8130<\/td><td class=\"column-4\">20.65<\/td><td class=\"column-5\">0.6840<\/td><td class=\"column-6\">17.37<\/td><td class=\"column-7\"><\/td><td class=\"column-8\">21.00<\/td><td class=\"column-9\"><\/td><td class=\"column-10\">18.00<\/td>\n<\/tr>\n<tr class=\"row-19\">\n\t<td class=\"column-1\">7\/8<\/td><td class=\"column-2\">9<\/td><td class=\"column-3\">0.8750<\/td><td class=\"column-4\">22.23<\/td><td class=\"column-5\">0.7330<\/td><td class=\"column-6\">18.62<\/td><td class=\"column-7\">29\/32<\/td><td class=\"column-8\">23.02<\/td><td class=\"column-9\">49\/64<\/td><td class=\"column-10\">19.50<\/td>\n<\/tr>\n<tr class=\"row-20\">\n\t<td class=\"column-1\">15\/16<\/td><td class=\"column-2\">9<\/td><td class=\"column-3\">0.9380<\/td><td class=\"column-4\">23.83<\/td><td class=\"column-5\">0.7950<\/td><td class=\"column-6\">20.19<\/td><td class=\"column-7\"><\/td><td class=\"column-8\">24.00<\/td><td class=\"column-9\"><\/td><td class=\"column-10\">20.75<\/td>\n<\/tr>\n<tr class=\"row-21\">\n\t<td class=\"column-1\">1<\/td><td class=\"column-2\">8<\/td><td class=\"column-3\">1.0000<\/td><td class=\"column-4\">25.40<\/td><td class=\"column-5\">0.8400<\/td><td class=\"column-6\">21.34<\/td><td class=\"column-7\">1 1\/16<\/td><td class=\"column-8\">26.99<\/td><td class=\"column-9\">7\/8<\/td><td class=\"column-10\">22.50<\/td>\n<\/tr>\n<tr class=\"row-22\">\n\t<td class=\"column-1\">1 1\/8<\/td><td class=\"column-2\">7<\/td><td class=\"column-3\">1.1250<\/td><td class=\"column-4\">28.58<\/td><td class=\"column-5\">0.9420<\/td><td class=\"column-6\">23.93<\/td><td class=\"column-7\">1 3\/16<\/td><td class=\"column-8\">30.16<\/td><td class=\"column-9\">1<\/td><td class=\"column-10\">25.50<\/td>\n<\/tr>\n<tr class=\"row-23\">\n\t<td class=\"column-1\">1 1\/4<\/td><td class=\"column-2\">7<\/td><td class=\"column-3\">1.2500<\/td><td class=\"column-4\">31.75<\/td><td class=\"column-5\">1.0670<\/td><td class=\"column-6\">27.10<\/td><td class=\"column-7\">1 5\/16<\/td><td class=\"column-8\">33.34<\/td><td class=\"column-9\">1 7\/16<\/td><td class=\"column-10\">28.50<\/td>\n<\/tr>\n<tr class=\"row-24\">\n\t<td class=\"column-1\">1 3\/8<\/td><td class=\"column-2\">6<\/td><td class=\"column-3\">1.3750<\/td><td class=\"column-4\">34.93<\/td><td class=\"column-5\">1.1620<\/td><td class=\"column-6\">29.51<\/td><td class=\"column-7\">1 7\/16<\/td><td class=\"column-8\">36.51<\/td><td class=\"column-9\">1 7\/32<\/td><td class=\"column-10\">31.00<\/td>\n<\/tr>\n<tr class=\"row-25\">\n\t<td class=\"column-1\">1 1\/2<\/td><td class=\"column-2\">6<\/td><td class=\"column-3\">1.5000<\/td><td class=\"column-4\">38.10<\/td><td class=\"column-5\">1.2870<\/td><td class=\"column-6\">32.69<\/td><td class=\"column-7\">1 9\/16<\/td><td class=\"column-8\">39.69<\/td><td class=\"column-9\">1 11\/32<\/td><td class=\"column-10\">34.50<\/td>\n<\/tr>\n<tr class=\"row-26\">\n\t<td class=\"column-1\">1 5\/8<\/td><td class=\"column-2\">5<\/td><td class=\"column-3\">1.6250<\/td><td class=\"column-4\">41.28<\/td><td class=\"column-5\">1.3690<\/td><td class=\"column-6\">34.77<\/td><td class=\"column-7\"><\/td><td class=\"column-8\">41.50<\/td><td class=\"column-9\"><\/td><td class=\"column-10\">35.50<\/td>\n<\/tr>\n<tr class=\"row-27\">\n\t<td class=\"column-1\">1 3\/4<\/td><td class=\"column-2\">5<\/td><td class=\"column-3\">1.7500<\/td><td class=\"column-4\">44.45<\/td><td class=\"column-5\">1.4940<\/td><td class=\"column-6\">37.95<\/td><td class=\"column-7\"><\/td><td class=\"column-8\">45.00<\/td><td class=\"column-9\"><\/td><td class=\"column-10\">38.50<\/td>\n<\/tr>\n<tr class=\"row-28\">\n\t<td class=\"column-1\">1 7\/8<\/td><td class=\"column-2\">4.5<\/td><td class=\"column-3\">1.8750<\/td><td class=\"column-4\">47.63<\/td><td class=\"column-5\">1.5910<\/td><td class=\"column-6\">40.40<\/td><td class=\"column-7\"><\/td><td class=\"column-8\">48.00<\/td><td class=\"column-9\"><\/td><td class=\"column-10\">41.25<\/td>\n<\/tr>\n<tr class=\"row-29\">\n\t<td class=\"column-1\">2<\/td><td class=\"column-2\">4.5<\/td><td class=\"column-3\">2.0000<\/td><td class=\"column-4\">50.80<\/td><td class=\"column-5\">1.7150<\/td><td class=\"column-6\">43.57<\/td><td class=\"column-7\"><\/td><td class=\"column-8\">51.00<\/td><td class=\"column-9\"><\/td><td class=\"column-10\">44.50<\/td>\n<\/tr>\n<tr class=\"row-30\">\n\t<td class=\"column-1\">2 1\/4<\/td><td class=\"column-2\">4<\/td><td class=\"column-3\"><\/td><td class=\"column-4\"><\/td><td class=\"column-5\"><\/td><td class=\"column-6\"><\/td><td class=\"column-7\"><\/td><td class=\"column-8\"><\/td><td class=\"column-9\"><\/td><td class=\"column-10\">50.00<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<!-- #tablepress-18 from cache -->\n<p><img decoding=\"async\" class=\"alignnone size-full wp-image-9562\" src=\"https:\/\/international.optimas.com\/wp-content\/uploads\/2022\/04\/bsw-whitworth-thread.jpg\" alt=\"BSW British Standard Whitworth Thread Form\" width=\"600\" height=\"349\" \/><\/p>\n<\/div><div class=\"nav fusion-mobile-tab-nav\"><ul class=\"nav-tabs\" role=\"tablist\" aria-orientation=\"horizontal\"><li  role=\"presentation\"><a class=\"tab-link\" data-toggle=\"tab\" role=\"tab\" aria-controls=\"tab-91c1031a76ceccd9245\" aria-selected=\"false\" tabindex=\"-1\" id=\"mobile-fusion-tab-91c1031a76ceccd9245\" href=\"#tab-91c1031a76ceccd9245\"><h4 class=\"fusion-tab-heading\">BSF<\/h4><\/a><\/li><\/ul><\/div><div class=\"tab-pane fade fusion-clearfix\" role=\"tabpanel\" tabindex=\"0\" aria-labelledby=\"fusion-tab-91c1031a76ceccd9245\" id=\"tab-91c1031a76ceccd9245\">\n<table id=\"tablepress-19\" class=\"tablepress tablepress-id-19\">\n<thead>\n<tr class=\"row-1\">\n\t<th class=\"column-1\">Thread Size<\/th><th class=\"column-2\">Threads per Inch<\/th><th colspan=\"2\" class=\"column-3\">External Major Diameter<\/th><th colspan=\"2\" class=\"column-5\">Internal Major Diameter<\/th><th colspan=\"2\" class=\"column-7\">Drill Size Clearance Hole<\/th><th colspan=\"2\" class=\"column-9\">Drill Size Tapped Hole<\/th>\n<\/tr>\n<\/thead>\n<tbody class=\"row-striping row-hover\">\n<tr class=\"row-2\">\n\t<td class=\"column-1\"><b>BSF 55<\/b><\/td><td class=\"column-2\"><\/td><td class=\"column-3\"><b>INCH<\/b><\/td><td class=\"column-4\"><b>MM<\/b><\/td><td class=\"column-5\"><b>INCH<\/b><\/td><td class=\"column-6\"><b>MM<\/b><\/td><td class=\"column-7\"><b>INCH<\/b><\/td><td class=\"column-8\"><b>MM<\/b><\/td><td class=\"column-9\"><b>INCH<\/b><\/td><td class=\"column-10\"><b>MM<\/b><\/td>\n<\/tr>\n<tr class=\"row-3\">\n\t<td class=\"column-1\">3\/16<\/td><td class=\"column-2\">32<\/td><td class=\"column-3\">0.1875<\/td><td class=\"column-4\">4.76<\/td><td class=\"column-5\">0.1475<\/td><td class=\"column-6\">3.75<\/td><td class=\"column-7\"><\/td><td class=\"column-8\">4.90<\/td><td class=\"column-9\"># 22<\/td><td class=\"column-10\">4.00<\/td>\n<\/tr>\n<tr class=\"row-4\">\n\t<td class=\"column-1\">7\/32<\/td><td class=\"column-2\">28<\/td><td class=\"column-3\">0.2188<\/td><td class=\"column-4\">5.56<\/td><td class=\"column-5\">0.1730<\/td><td class=\"column-6\">4.39<\/td><td class=\"column-7\"><\/td><td class=\"column-8\">5.70<\/td><td class=\"column-9\"># 15<\/td><td class=\"column-10\">4.60<\/td>\n<\/tr>\n<tr class=\"row-5\">\n\t<td class=\"column-1\">1\/4<\/td><td class=\"column-2\">26<\/td><td class=\"column-3\">0.2500<\/td><td class=\"column-4\">6.35<\/td><td class=\"column-5\">0.2000<\/td><td class=\"column-6\">5.08<\/td><td class=\"column-7\">17\/64<\/td><td class=\"column-8\">6.75<\/td><td class=\"column-9\"># 3<\/td><td class=\"column-10\">5.50<\/td>\n<\/tr>\n<tr class=\"row-6\">\n\t<td class=\"column-1\">9\/32<\/td><td class=\"column-2\">26<\/td><td class=\"column-3\">0.2800<\/td><td class=\"column-4\">7.14<\/td><td class=\"column-5\">0.2300<\/td><td class=\"column-6\">5.89<\/td><td class=\"column-7\"><\/td><td class=\"column-8\"><\/td><td class=\"column-9\"><\/td><td class=\"column-10\">6.10<\/td>\n<\/tr>\n<tr class=\"row-7\">\n\t<td class=\"column-1\">5\/16<\/td><td class=\"column-2\">22<\/td><td class=\"column-3\">0.3125<\/td><td class=\"column-4\">7.94<\/td><td class=\"column-5\">0.2540<\/td><td class=\"column-6\">6.45<\/td><td class=\"column-7\">21\/64<\/td><td class=\"column-8\">8.33<\/td><td class=\"column-9\">17\/64<\/td><td class=\"column-10\">6.75<\/td>\n<\/tr>\n<tr class=\"row-8\">\n\t<td class=\"column-1\">3\/8<\/td><td class=\"column-2\">20<\/td><td class=\"column-3\">0.3750<\/td><td class=\"column-4\">9.53<\/td><td class=\"column-5\">0.3110<\/td><td class=\"column-6\">7.90<\/td><td class=\"column-7\">25\/64<\/td><td class=\"column-8\">9.92<\/td><td class=\"column-9\">21\/64<\/td><td class=\"column-10\">8.33<\/td>\n<\/tr>\n<tr class=\"row-9\">\n\t<td class=\"column-1\">7\/16<\/td><td class=\"column-2\">18<\/td><td class=\"column-3\">0.4375<\/td><td class=\"column-4\">11.11<\/td><td class=\"column-5\">0.3660<\/td><td class=\"column-6\">9.30<\/td><td class=\"column-7\">29\/64<\/td><td class=\"column-8\">11.51<\/td><td class=\"column-9\">3\/8<\/td><td class=\"column-10\">9.53<\/td>\n<\/tr>\n<tr class=\"row-10\">\n\t<td class=\"column-1\">1\/2<\/td><td class=\"column-2\">16<\/td><td class=\"column-3\">0.5000<\/td><td class=\"column-4\">12.70<\/td><td class=\"column-5\">0.4200<\/td><td class=\"column-6\">10.67<\/td><td class=\"column-7\">17\/32<\/td><td class=\"column-8\">13.49<\/td><td class=\"column-9\">7\/16<\/td><td class=\"column-10\">11.11<\/td>\n<\/tr>\n<tr class=\"row-11\">\n\t<td class=\"column-1\">9\/16<\/td><td class=\"column-2\">16<\/td><td class=\"column-3\">0.5625<\/td><td class=\"column-4\">14.29<\/td><td class=\"column-5\">0.4820<\/td><td class=\"column-6\">12.24<\/td><td class=\"column-7\">19\/32<\/td><td class=\"column-8\">15.08<\/td><td class=\"column-9\">1\/2<\/td><td class=\"column-10\">12.70<\/td>\n<\/tr>\n<tr class=\"row-12\">\n\t<td class=\"column-1\">5\/8<\/td><td class=\"column-2\">14<\/td><td class=\"column-3\">0.6250<\/td><td class=\"column-4\">15.88<\/td><td class=\"column-5\">0.5330<\/td><td class=\"column-6\">13.54<\/td><td class=\"column-7\">21\/32<\/td><td class=\"column-8\">16.67<\/td><td class=\"column-9\">9\/16<\/td><td class=\"column-10\">14.29<\/td>\n<\/tr>\n<tr class=\"row-13\">\n\t<td class=\"column-1\">11\/16<\/td><td class=\"column-2\">14<\/td><td class=\"column-3\">0.6875<\/td><td class=\"column-4\">17.46<\/td><td class=\"column-5\">0.5960<\/td><td class=\"column-6\">15.14<\/td><td class=\"column-7\"><\/td><td class=\"column-8\">17.75<\/td><td class=\"column-9\"><\/td><td class=\"column-10\">15.50<\/td>\n<\/tr>\n<tr class=\"row-14\">\n\t<td class=\"column-1\">3\/4<\/td><td class=\"column-2\">12<\/td><td class=\"column-3\">0.7500<\/td><td class=\"column-4\">19.05<\/td><td class=\"column-5\">0.6430<\/td><td class=\"column-6\">16.33<\/td><td class=\"column-7\">25\/32<\/td><td class=\"column-8\">19.84<\/td><td class=\"column-9\">43\/64<\/td><td class=\"column-10\">17.07<\/td>\n<\/tr>\n<tr class=\"row-15\">\n\t<td class=\"column-1\">13\/16<\/td><td class=\"column-2\">12<\/td><td class=\"column-3\">0.8100<\/td><td class=\"column-4\">20.64<\/td><td class=\"column-5\">0.7100<\/td><td class=\"column-6\">17.92<\/td><td class=\"column-7\"><\/td><td class=\"column-8\"><\/td><td class=\"column-9\"><\/td><td class=\"column-10\">18.25<\/td>\n<\/tr>\n<tr class=\"row-16\">\n\t<td class=\"column-1\">7\/8<\/td><td class=\"column-2\">11<\/td><td class=\"column-3\">0.8750<\/td><td class=\"column-4\">22.23<\/td><td class=\"column-5\">0.7590<\/td><td class=\"column-6\">19.28<\/td><td class=\"column-7\">29\/32<\/td><td class=\"column-8\">23.02<\/td><td class=\"column-9\">25\/32<\/td><td class=\"column-10\">19.84<\/td>\n<\/tr>\n<tr class=\"row-17\">\n\t<td class=\"column-1\">1<\/td><td class=\"column-2\">10<\/td><td class=\"column-3\">1.0000<\/td><td class=\"column-4\">25.40<\/td><td class=\"column-5\">0.8750<\/td><td class=\"column-6\">22.15<\/td><td class=\"column-7\">1 1\/16<\/td><td class=\"column-8\">26.99<\/td><td class=\"column-9\">29\/32<\/td><td class=\"column-10\">23.02<\/td>\n<\/tr>\n<tr class=\"row-18\">\n\t<td class=\"column-1\">1 1\/8<\/td><td class=\"column-2\">9<\/td><td class=\"column-3\">1.1250<\/td><td class=\"column-4\">28.58<\/td><td class=\"column-5\">0.9830<\/td><td class=\"column-6\">24.97<\/td><td class=\"column-7\">1 3\/16<\/td><td class=\"column-8\">30.16<\/td><td class=\"column-9\">1 1\/64<\/td><td class=\"column-10\">25.80<\/td>\n<\/tr>\n<tr class=\"row-19\">\n\t<td class=\"column-1\">1 1\/4<\/td><td class=\"column-2\">9<\/td><td class=\"column-3\">1.2500<\/td><td class=\"column-4\">31.75<\/td><td class=\"column-5\">1.1080<\/td><td class=\"column-6\">28.14<\/td><td class=\"column-7\">1 5\/16<\/td><td class=\"column-8\">33.34<\/td><td class=\"column-9\">1 9\/64<\/td><td class=\"column-10\">28.97<\/td>\n<\/tr>\n<tr class=\"row-20\">\n\t<td class=\"column-1\">1 3\/8<\/td><td class=\"column-2\">8<\/td><td class=\"column-3\">1.3750<\/td><td class=\"column-4\">34.93<\/td><td class=\"column-5\">1.2150<\/td><td class=\"column-6\">30.86<\/td><td class=\"column-7\">1 7\/16<\/td><td class=\"column-8\">36.51<\/td><td class=\"column-9\">1 1\/4<\/td><td class=\"column-10\">31.75<\/td>\n<\/tr>\n<tr class=\"row-21\">\n\t<td class=\"column-1\">1 1\/2<\/td><td class=\"column-2\">8<\/td><td class=\"column-3\">1.5000<\/td><td class=\"column-4\">38.10<\/td><td class=\"column-5\">1.3400<\/td><td class=\"column-6\">34.04<\/td><td class=\"column-7\">1 9\/16<\/td><td class=\"column-8\">39.69<\/td><td class=\"column-9\">1 3\/8<\/td><td class=\"column-10\">34.93<\/td>\n<\/tr>\n<tr class=\"row-22\">\n\t<td class=\"column-1\">1 5\/8<\/td><td class=\"column-2\">8<\/td><td class=\"column-3\">1.6300<\/td><td class=\"column-4\">41.30<\/td><td class=\"column-5\">1.4600<\/td><td class=\"column-6\">37.21<\/td><td class=\"column-7\"><\/td><td class=\"column-8\"><\/td><td class=\"column-9\"><\/td><td class=\"column-10\">37.50<\/td>\n<\/tr>\n<tr class=\"row-23\">\n\t<td class=\"column-1\">1 3\/4<\/td><td class=\"column-2\">7<\/td><td class=\"column-3\">1.7500<\/td><td class=\"column-4\">44.45<\/td><td class=\"column-5\">1.5670<\/td><td class=\"column-6\">39.80<\/td><td class=\"column-7\"><\/td><td class=\"column-8\">45.00<\/td><td class=\"column-9\"><\/td><td class=\"column-10\">41.00<\/td>\n<\/tr>\n<tr class=\"row-24\">\n\t<td class=\"column-1\">2<\/td><td class=\"column-2\">7<\/td><td class=\"column-3\">2.0000<\/td><td class=\"column-4\">50.80<\/td><td class=\"column-5\">1.8170<\/td><td class=\"column-6\">46.15<\/td><td class=\"column-7\"><\/td><td class=\"column-8\">52.00<\/td><td class=\"column-9\"><\/td><td class=\"column-10\">47.00<\/td>\n<\/tr>\n<tr class=\"row-25\">\n\t<td class=\"column-1\">2 1\/4<\/td><td class=\"column-2\">6<\/td><td class=\"column-3\">2.2500<\/td><td class=\"column-4\">57.15<\/td><td class=\"column-5\">2.0366<\/td><td class=\"column-6\">51.73<\/td><td class=\"column-7\"><\/td><td class=\"column-8\">58.00<\/td><td class=\"column-9\"><\/td><td class=\"column-10\">53.00<\/td>\n<\/tr>\n<tr class=\"row-26\">\n\t<td class=\"column-1\">2 1\/2<\/td><td class=\"column-2\">6<\/td><td class=\"column-3\">2.5000<\/td><td class=\"column-4\">63.50<\/td><td class=\"column-5\">2.2866<\/td><td class=\"column-6\">58.08<\/td><td class=\"column-7\"><\/td><td class=\"column-8\">64.00<\/td><td class=\"column-9\"><\/td><td class=\"column-10\">58.00<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<!-- #tablepress-19 from cache --><\/div><\/div><\/div><\/div><\/div><\/div><\/div><div class=\"fusion-fullwidth fullwidth-box fusion-builder-row-6 fusion-flex-container has-pattern-background has-mask-background nonhundred-percent-fullwidth 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