Torx\u00ae Pan Head, Slot Pan Head and Flat Head Machine Screws<\/h1>\n
Optimas designed the Parts Imperial Blog Series to provide detailed information about the fasteners you use and the ones you may need. Curated to help you find the right parts, these technical releases supply information on components\u2019 specifications, applications and standards. This Imperial Series is comprised of five types of components: flat washers, hex cap screws, locknuts, machine screws and tapping screws. Once you have determined the parts suited for your application, Optimas can source them through manufacturing and distribution, ensuring you get the parts you need.<\/p>\n
The Torx\u00ae slot, pan and flat head machine screws are designed to hold metal components together and have a specified minimum tensile strength of 60,000 psi. They are designed to be used with a mating machine screw nut, a standard hex nut of Grade 2 or higher strength, or a mating tapped thread. The threads are Class 2A thread fit and thread length is 1\u201d minimum for diameters up to #5 included and 1-1\/2\u201d minimum for all sizes #6 and larger.<\/p>\n
The Torx\u00ae drive allows installation and removal with a mating Torx\u00ae driver bit.* The Torx\u00ae recess provides excellent ability to apply sufficient torque to the fastener. Serviceability will require access to a Torx\u00ae driver bit.**<\/p>\n
*Installation and removal of the Torx\u00ae slot pan head machine screw can be done with a slotted screwdriver. The added slot of a slot pan head allows serviceability with common tools.<\/p>\n
** The countersunk head of the Torx\u00ae flat head machine screw requires an 80\u00b0 included angle countersink.<\/p>\n
Specification Resources<\/p>\n
Dimensional and material requirements are controlled by ASME B18.6.3 and Torx\u00ae licensed standards. This type of fastener is generally available in sizes #4 through 1\/2\u201d diameter and length as shown in the tables listed below. Other lengths are possible.<\/p>\n
\u00a0Torx\u00ae Pan Head Machine Screws<\/h2>\n<\/div><\/div><\/div>![\"Top](\"https:\/\/optimas.com\/wp-content\/uploads\/2022\/11\/Torx-Pan-Head-Machine-Screws.png\" "\\"Torx")
<\/span><\/div><\/div><\/div>![\"Torx\u00ae](\"https:\/\/optimas.com\/wp-content\/uploads\/2022\/11\/Torx-Pan-Head-Machine-Screw.png\" "\\"Torx")
<\/span><\/div><\/div><\/div><\/div><\/div> Torx\u00ae Pan Head Machine Screws<\/h4>\n\n
\n \n THREAD SIZE<\/th>\n #4<\/th>\n #5<\/th>\n #6<\/th>\n #8<\/th>\n #10<\/th>\n 1\/4\"<\/th>\n 5\/16\"<\/th>\n 3\/8\"<\/th>\n 7\/16\"<\/th>\n 1\/2\"<\/th>\n \n <\/tr>\n\n \n THREAD PITCH<\/td>\n 40 UNC<\/td>\n 48 UNF<\/td>\n\n 40 UNC<\/td>\n 44 UNF<\/td>\n\n 32 UNC<\/td>\n 40 UNF<\/td>\n\n\n 32 UNC<\/td>\n 36 UNF<\/td>\n\n 24 UNC<\/td>\n 32 UNF<\/td>\n\n 20 UNC<\/td>\n 28 UNF<\/td>\n\n 18 UNC<\/td>\n 24 UNF<\/td>\n\n 16 UNC<\/td>\n 24 UNF<\/td>\n\n 14 UNC<\/td>\n 20 UNF<\/td>\n\n 13 UNC<\/td>\n 20 UNF<\/td>\n <\/tr>\n\n \n \n HEAD DIAMETER\n <\/td>\n .205\/.219<\/td>\n .231\/.245<\/td>\n .256\/.270<\/td>\n .306\/.322<\/td>\n .357\/.373<\/td>\n .473\/.492<\/td>\n .594\/.615<\/td>\n .716\/.740<\/td>\n .837\/.863<\/td>\n .958\/.987<\/td>\n <\/tr>\n\n \n \n HEAD HEIGHT \n <\/td>\n .070\/.080<\/td>\n .079\/.089<\/td>\n .087\/.097<\/td>\n .105\/.115<\/td>\n .122\/.133<\/td>\n .162\/.175<\/td>\n .203\/.218<\/td>\n .244\/.261<\/td>\n .284\/.305<\/td>\n .325\/.348<\/td>\n <\/tr>\n\n \n\n \n \n THREAD LENGTH\n <\/td>\n Fully threaded up to 1-1\/8\u201d included. Longer lengths \nare 1\u201d min. thread length.<\/td>\n\n Fully threaded up to 2\u201d included. Longer lengths are 1-1\/2\u201d min. thread length.<\/td>\n <\/tr>\n\n \n \n DRIVER SIZE\n <\/td>\n\n \n T10\n <\/td>\n\n \n T15\n <\/td>\n\n \n T20\n <\/td>\n\n \n T25\n <\/td>\n\n \n T30\n <\/td>\n\n \n T40\n <\/td>\n\n \n T45\n <\/td>\n\n \n T50\n <\/td>\n\n \n T55\n <\/td>\n\n <\/tr>\n\n \n \n 1\/8 - 1\/2 (Lengths)<\/td>\n \u2013.02 (Length Tolerance)<\/td>\n \u2013.03 (Length Tolerance)<\/td>\n <\/tr>\n \n \n 5\/8 - 1 (Lengths)<\/td>\n \u2013.03 (Length Tolerance)<\/td>\n \u2013.03 (Length Tolerance)<\/td>\n <\/tr>\n \n\n \n 1-1\/8 - 2 (Lengths)<\/td>\n \u2013.06 (Length Tolerance)<\/td>\n <\/tr>\n\n \n 2-1\/4 - Over 6 (Lengths)<\/td>\n \u2013.09 (Length Tolerance)<\/td>\n <\/tr>\n \n <\/tbody><\/table>\n\n*Common dimensions of Torx\u00ae pan head machine screws are given in inches.<\/p><\/div><\/div><\/div><\/div>
\u00a0Torx\u00ae Slot Pan Head Machine Screws<\/h2>\n<\/div><\/div><\/div>![\"Top](\"https:\/\/optimas.com\/wp-content\/uploads\/2022\/11\/Torx-Slot-Pan-Head-Machine-Screws.png\" "\\"Torx")
<\/span><\/div><\/div><\/div>![\"Torx\u00ae](\"https:\/\/optimas.com\/wp-content\/uploads\/2022\/11\/Torx-Slot-Pan-Head-Machine-Screw.png\" "\\"Torx")
<\/span><\/div><\/div><\/div> Torx\u00ae Slot Pan Head Machine Screws<\/h4>\n\n
\n \n THREAD SIZE<\/th>\n #4<\/th>\n #5<\/th>\n #6<\/th>\n #8<\/th>\n #10<\/th>\n 1\/4\"<\/th>\n 5\/16\"<\/th>\n 3\/8\"<\/th>\n 7\/16\"<\/th>\n 1\/2\"<\/th>\n \n <\/tr>\n\n \n THREAD PITCH<\/td>\n 40 UNC<\/td>\n 48 UNF<\/td>\n\n 40 UNC<\/td>\n 44 UNF<\/td>\n\n 32 UNC<\/td>\n 40 UNF<\/td>\n\n\n 32 UNC<\/td>\n 36 UNF<\/td>\n\n 24 UNC<\/td>\n 32 UNF<\/td>\n\n 20 UNC<\/td>\n 28 UNF<\/td>\n\n 18 UNC<\/td>\n 24 UNF<\/td>\n\n 16 UNC<\/td>\n 24 UNF<\/td>\n\n 14 UNC<\/td>\n 20 UNF<\/td>\n\n 13 UNC<\/td>\n 20 UNF<\/td>\n <\/tr>\n\n \n \n HEAD DIAMETER\n <\/td>\n .205\/.219<\/td>\n .231\/.245<\/td>\n .256\/.270<\/td>\n .306\/.322<\/td>\n .357\/.373<\/td>\n .473\/.492<\/td>\n .594\/.615<\/td>\n .716\/.740<\/td>\n .837\/.863<\/td>\n .958\/.987<\/td>\n <\/tr>\n\n \n \n HEAD HEIGHT \n <\/td>\n .070\/.080<\/td>\n .079\/.089<\/td>\n .087\/.097<\/td>\n .105\/.115<\/td>\n .122\/.133<\/td>\n .162\/.175<\/td>\n .203\/.218<\/td>\n .244\/.261<\/td>\n .284\/.305<\/td>\n .325\/.348<\/td>\n <\/tr>\n\n \n \n SLOT WIDTH\n <\/td>\n .035 min.<\/td>\n .039 min.<\/td>\n .045 min.<\/td>\n .050 min.<\/td>\n .064 min.<\/td>\n .072 min.<\/td>\n .081 min.<\/td>\n .081 min.<\/td>\n .091 min.<\/td>\n <\/tr>\n\n \n \n THREAD LENGTH\n <\/td>\n Fully threaded up to 1-1\/8\u201d included. Longer lengths \nare 1\u201d min. thread length.<\/td>\n\n Fully threaded up to 2\u201d included. Longer lengths are 1-1\/2\u201d min. thread length.<\/td>\n <\/tr>\n\n \n \n DRIVER SIZE\n <\/td>\n\n \n T10\n <\/td>\n\n \n T15\n <\/td>\n\n \n T20\n <\/td>\n\n \n T25\n <\/td>\n\n \n T30\n <\/td>\n\n \n T40\n <\/td>\n\n \n T45\n <\/td>\n\n \n T50\n <\/td>\n\n \n T55\n <\/td>\n\n <\/tr>\n\n \n \n \n 1\/8 - 1\/2 (Lengths)<\/td>\n \u2013.02 (Length Tolerance)<\/td>\n \u2013.03 (Length Tolerance)<\/td>\n <\/tr>\n \n\n \n 5\/8 - 1 (Lengths)<\/td>\n \u2013.03 (Length Tolerance)<\/td>\n \u2013.03 (Length Tolerance)<\/td>\n <\/tr>\n\n\n \n 1-1\/8 - 2 (Lengths)<\/td>\n \u2013.06 (Length Tolerance)<\/td>\n <\/tr>\n \n\n \n 2-1\/4 - Over 6 (Lengths)<\/td>\n \u2013.09 (Length Tolerance)<\/td>\n <\/tr>\n \n <\/tbody><\/table>\n\n*Common dimensions of Torx\u00ae slot pan head machine screws are given in inches.<\/p><\/div><\/div><\/div><\/div>
\u00a0Torx\u00ae Flat Head Machine Screws<\/h2>\n<\/div><\/div><\/div>![\"Torx\u00ae](\"https:\/\/optimas.com\/wp-content\/uploads\/2022\/11\/Torx-Flat-Head-Machine-Screws.png\" "\\"Torx")
<\/span><\/div><\/div><\/div>![\"Torx\u00ae](\"https:\/\/optimas.com\/wp-content\/uploads\/2022\/11\/Torx-Flat-Head-Machine-Screw.png\" "\\"Torx")
<\/span><\/div><\/div><\/div> Torx\u00ae Flat Head Machine Screws<\/h4>\n\n
\n \n THREAD SIZE<\/th>\n #4<\/th>\n #5<\/th>\n #6<\/th>\n #8<\/th>\n #10<\/th>\n 1\/4\"<\/th>\n 5\/16\"<\/th>\n 3\/8\"<\/th>\n 7\/16\"<\/th>\n 1\/2\"<\/th>\n \n <\/tr>\n\n \n THREAD PITCH<\/td>\n 40 UNC<\/td>\n 48 UNF<\/td>\n\n 40 UNC<\/td>\n 44 UNF<\/td>\n\n 32 UNC<\/td>\n 40 UNF<\/td>\n\n\n 32 UNC<\/td>\n 36 UNF<\/td>\n\n 24 UNC<\/td>\n 32 UNF<\/td>\n\n 20 UNC<\/td>\n 28 UNF<\/td>\n\n 18 UNC<\/td>\n 24 UNF<\/td>\n\n 16 UNC<\/td>\n 24 UNF<\/td>\n\n 14 UNC<\/td>\n 20 UNF<\/td>\n\n 13 UNC<\/td>\n 20 UNF<\/td>\n <\/tr>\n\n \n \n HEAD DIAMETER\n <\/td>\n .205\/.219<\/td>\n .231\/.245<\/td>\n .256\/.270<\/td>\n .306\/.322<\/td>\n .357\/.373<\/td>\n .473\/.492<\/td>\n .594\/.615<\/td>\n .716\/.740<\/td>\n .837\/.863<\/td>\n .958\/.987<\/td>\n <\/tr>\n\n \n \n HEAD HEIGHT \n <\/td>\n .070\/.080<\/td>\n .079\/.089<\/td>\n .087\/.097<\/td>\n .105\/.115<\/td>\n .122\/.133<\/td>\n .162\/.175<\/td>\n .203\/.218<\/td>\n .244\/.261<\/td>\n .284\/.305<\/td>\n .325\/.348<\/td>\n <\/tr>\n\n \n \n ANGLE\n <\/td>\n 80\u00b0 \/ 82\u00b0<\/td>\n <\/tr>\n\n \n \n THREAD LENGTH\n <\/td>\n Fully threaded up to 1-1\/8\u201d included. Longer lengths \nare 1\u201d min. thread length.<\/td>\n\n Fully threaded up to 2\u201d included. Longer lengths are 1-1\/2\u201d min. thread length.<\/td>\n <\/tr>\n\n \n \n DRIVER SIZE\n <\/td>\n\n \n T8\n <\/td>\n\n \n T10\n <\/td>\n\n \n T15\n <\/td>\n\n \n T20\n <\/td>\n\n \n T27\n <\/td>\n\n \n T40\n <\/td>\n\n \n T50\n <\/td>\n <\/tr>\n\n \n \n \n 1\/8 - 1\/2 (Lengths)<\/td>\n \u2013.02 (Length Tolerance)<\/td>\n \u2013.03 (Length Tolerance)<\/td>\n <\/tr>\n \n\n\n \n 5\/8 - 1 (Lengths)<\/td>\n \u2013.03 (Length Tolerance)<\/td>\n \u2013.03 (Length Tolerance)<\/td>\n <\/tr>\n \n\n \n 1-1\/8 - 2 (Lengths)<\/td>\n \u2013.06 (Length Tolerance)<\/td>\n <\/tr>\n\n\n \n 2-1\/4 - Over 6 (Lengths)<\/td>\n \u2013.09 (Length Tolerance)<\/td>\n <\/tr>\n \n <\/tbody><\/table>\n\n*Common dimensions of Torx\u00ae slot pan head machine screws are given in inches.<\/p><\/div><\/div><\/div><\/div><\/p>","protected":false},"excerpt":{"rendered":"","protected":false},"author":1,"featured_media":5929,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"content-type":"","footnotes":""},"categories":[47],"tags":[],"class_list":["post-5905","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-product-expertise"],"acf":[],"_links":{"self":[{"href":"https:\/\/optimas.com\/en_gb\/wp-json\/wp\/v2\/posts\/5905","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/optimas.com\/en_gb\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/optimas.com\/en_gb\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/optimas.com\/en_gb\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/optimas.com\/en_gb\/wp-json\/wp\/v2\/comments?post=5905"}],"version-history":[{"count":0,"href":"https:\/\/optimas.com\/en_gb\/wp-json\/wp\/v2\/posts\/5905\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/optimas.com\/en_gb\/wp-json\/wp\/v2\/media\/5929"}],"wp:attachment":[{"href":"https:\/\/optimas.com\/en_gb\/wp-json\/wp\/v2\/media?parent=5905"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/optimas.com\/en_gb\/wp-json\/wp\/v2\/categories?post=5905"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/optimas.com\/en_gb\/wp-json\/wp\/v2\/tags?post=5905"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
<\/span><\/div><\/div><\/div><\/span><\/div><\/div><\/div><\/div><\/div>Torx\u00ae Pan Head Machine Screws<\/h4>\n\n
| THREAD SIZE<\/th>\n | #4<\/th>\n | #5<\/th>\n | #6<\/th>\n | #8<\/th>\n | #10<\/th>\n | 1\/4\"<\/th>\n | 5\/16\"<\/th>\n | 3\/8\"<\/th>\n | 7\/16\"<\/th>\n | 1\/2\"<\/th>\n \n <\/tr>\n\n | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| THREAD PITCH<\/td>\n | 40 UNC<\/td>\n | 48 UNF<\/td>\n\n | 40 UNC<\/td>\n | 44 UNF<\/td>\n\n | 32 UNC<\/td>\n | 40 UNF<\/td>\n\n\n | 32 UNC<\/td>\n | 36 UNF<\/td>\n\n | 24 UNC<\/td>\n | 32 UNF<\/td>\n\n | 20 UNC<\/td>\n | 28 UNF<\/td>\n\n | 18 UNC<\/td>\n | 24 UNF<\/td>\n\n | 16 UNC<\/td>\n | 24 UNF<\/td>\n\n | 14 UNC<\/td>\n | 20 UNF<\/td>\n\n | 13 UNC<\/td>\n | 20 UNF<\/td>\n <\/tr>\n\n | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| \n HEAD DIAMETER\n <\/td>\n | .205\/.219<\/td>\n | .231\/.245<\/td>\n | .256\/.270<\/td>\n | .306\/.322<\/td>\n | .357\/.373<\/td>\n | .473\/.492<\/td>\n | .594\/.615<\/td>\n | .716\/.740<\/td>\n | .837\/.863<\/td>\n | .958\/.987<\/td>\n <\/tr>\n\n | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| \n HEAD HEIGHT \n <\/td>\n | .070\/.080<\/td>\n | .079\/.089<\/td>\n | .087\/.097<\/td>\n | .105\/.115<\/td>\n | .122\/.133<\/td>\n | .162\/.175<\/td>\n | .203\/.218<\/td>\n | .244\/.261<\/td>\n | .284\/.305<\/td>\n | .325\/.348<\/td>\n <\/tr>\n\n \n\n | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| \n THREAD LENGTH\n <\/td>\n | Fully threaded up to 1-1\/8\u201d included. Longer lengths \nare 1\u201d min. thread length.<\/td>\n\n | Fully threaded up to 2\u201d included. Longer lengths are 1-1\/2\u201d min. thread length.<\/td>\n <\/tr>\n\n | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| \n DRIVER SIZE\n <\/td>\n\n | \n T10\n <\/td>\n\n | \n T15\n <\/td>\n\n | \n T20\n <\/td>\n\n | \n T25\n <\/td>\n\n | \n T30\n <\/td>\n\n | \n T40\n <\/td>\n\n | \n T45\n <\/td>\n\n | \n T50\n <\/td>\n\n | \n T55\n <\/td>\n\n <\/tr>\n\n \n | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 1\/8 - 1\/2 (Lengths)<\/td>\n | \u2013.02 (Length Tolerance)<\/td>\n | \u2013.03 (Length Tolerance)<\/td>\n <\/tr>\n \n | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 5\/8 - 1 (Lengths)<\/td>\n | \u2013.03 (Length Tolerance)<\/td>\n | \u2013.03 (Length Tolerance)<\/td>\n <\/tr>\n \n\n | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 1-1\/8 - 2 (Lengths)<\/td>\n | \u2013.06 (Length Tolerance)<\/td>\n <\/tr>\n\n | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 2-1\/4 - Over 6 (Lengths)<\/td>\n | \u2013.09 (Length Tolerance)<\/td>\n <\/tr>\n \n <\/tbody><\/table>\n\n *Common dimensions of Torx\u00ae pan head machine screws are given in inches.<\/p><\/div><\/div><\/div><\/div> \u00a0Torx\u00ae Slot Pan Head Machine Screws<\/h2>\n<\/div><\/div><\/div><\/span><\/div><\/div><\/div><\/span><\/div><\/div><\/div>Torx\u00ae Slot Pan Head Machine Screws<\/h4>\n\n
|