\n\t| <\/td> | 4.6<\/strong><\/td>4.8<\/strong><\/td>5.6<\/strong><\/td>5.8<\/strong><\/td>6.8<\/strong><\/td>8.8<\/strong><\/td>9.8<\/strong><\/td>10.9<\/strong><\/td>12.9\/ 12.9<\/strong><\/td>\n<\/tr>\n\n\t| d \u2264<\/td> | d > <\/td> | d \u2264 <\/td>\n<\/tr>\n | \n\t16 mm\u00a0a<\/sup><\/td>16 mm\u00a0b<\/sup><\/td>| 16 mm<\/td>\n<\/tr>\n | \n\tTensile strength, Rm<\/sup>, MPa<\/td>nom.c<\/sup><\/td>| 400<\/td> | 500<\/td> | 600<\/td> | 800<\/td> | 900<\/td> | 1000<\/td> | 1200<\/td>\n<\/tr>\n | \n\t| <\/td> | min.<\/td> | 400<\/td> | 420<\/td> | 500<\/td> | 520<\/td> | 600<\/td> | 800<\/td> | 830<\/td> | 900<\/td> | 1040<\/td> | 1220<\/td>\n<\/tr>\n | \n\tLower yield strength, ReLd<\/sup>, MPa<\/td>nom.c<\/sup><\/td>| 240<\/td> | -<\/td> | 300<\/td> | -<\/td> | -<\/td> | -<\/td> | -<\/td> | -<\/td> | -<\/td> | -<\/td>\n<\/tr>\n | \n\t| <\/td> | min.<\/td> | 240<\/td> | -<\/td> | 300<\/td> | -<\/td> | -<\/td> | -<\/td> | -<\/td> | -<\/td> | -<\/td> | -<\/td>\n<\/tr>\n | \n\tStress at 0,2 % non-proportional elongation, Rp0,2<\/sup>, MPa<\/td>nom.c<\/sup><\/td>| -<\/td> | -<\/td> | -<\/td> | -<\/td> | -<\/td> | 640<\/td> | 640<\/td> | 720<\/td> | 900<\/td> | 1080<\/td>\n<\/tr>\n | \n\t| <\/td> | min.<\/td> | -<\/td> | -<\/td> | -<\/td> | -<\/td> | -<\/td> | 640<\/td> | 660<\/td> | 720<\/td> | 940<\/td> | 1100<\/td>\n<\/tr>\n | \n\tStress at 0,0048d non-proportional elongation for full-size fasteners, Rpf<\/sup>, Mpa<\/td>nom.c<\/sup><\/td>| -<\/td> | 320<\/td> | -<\/td> | 400<\/td> | 480<\/td> | -<\/td> | -<\/td> | -<\/td> | -<\/td> | -<\/td>\n<\/tr>\n | \n\t| <\/td> | min.<\/td> | -<\/td> | 340\u00a0e<\/sup><\/td>| -<\/td> | 420\u00a0e<\/sup><\/td>480\u00a0e<\/sup><\/td>| -<\/td> | -<\/td> | -<\/td> | -<\/td> | -<\/td>\n<\/tr>\n | \n\tStress under proof load, Spf<\/sup>, MPa<\/td>| nom.<\/td> | 225<\/td> | 310<\/td> | 280<\/td> | 380<\/td> | 440<\/td> | 580<\/td> | 600<\/td> | 650<\/td> | 830<\/td> | 970<\/td>\n<\/tr>\n | \n\t| Proof strength ratio<\/td> | 0,94<\/td> | 0,91<\/td> | 0,93<\/td> | 0,90<\/td> | 0,92<\/td> | 0,91<\/td> | 0,91<\/td> | 0,90<\/td> | 0,88<\/td> | 0,88<\/td>\n<\/tr>\n | \n\tSp,nom<\/sup>\/ReL,min<\/sup><\/td>\n<\/tr>\n\n\tor Sp,nom\/<\/sup>Rp0,2 min<\/sup>\u00a0or<\/td>\n<\/tr>\n\n\tSp,nom\/<\/sup>Rpf,min<\/sup><\/td>\n<\/tr>\n\n\t| Percentage elongation after fracture for machined test pieces, A, %<\/td> | min.<\/td> | 22<\/td> | -<\/td> | 20<\/td> | -<\/td> | -<\/td> | 12<\/td> | 12<\/td> | 10<\/td> | 9<\/td> | 8<\/td>\n<\/tr>\n | \n\t| Percentage reduction of area after fracture for machined test pieces, Z, %<\/td> | min.<\/td> | -<\/td> | 52<\/td> | 48<\/td> | 48<\/td> | 44<\/td>\n<\/tr>\n | \n\tElongation after fracture for full-size fasteners, Af<\/sup>\u00a0(see also Annex C)<\/td>| min.<\/td> | -<\/td> | 0,24<\/td> | -<\/td> | 0,22<\/td> | 0,20<\/td> | -<\/td> | -<\/td> | -<\/td> | -<\/td> | -<\/td>\n<\/tr>\n | \n\t| Head soundness<\/td> | <\/td> | No fracture<\/td>\n<\/tr>\n | \n\t| Vickers hardness, HV F \u2265 98 N<\/td> | min.<\/td> | 120<\/td> | 130<\/td> | 155<\/td> | 160<\/td> | 190<\/td> | 250<\/td> | 255<\/td> | 290<\/td> | 320<\/td> | 385<\/td>\n<\/tr>\n | \n\t| <\/td> | max.<\/td> | 220\u00a0g<\/td> | 250<\/td> | 320<\/td> | 335<\/td> | 360<\/td> | 380<\/td> | 435<\/td>\n<\/tr>\n | \n\t| Brinell hardness, HBW F = 30 D2<\/td> | min.<\/td> | 114<\/td> | 124<\/td> | 147<\/td> | 152<\/td> | 181<\/td> | 245<\/td> | 250<\/td> | 286<\/td> | 316<\/td> | 380<\/td>\n<\/tr>\n | \n\t| <\/td> | max.<\/td> | 209\u00a0g<\/td> | 238<\/td> | 316<\/td> | 331<\/td> | 355<\/td> | 375<\/td> | 429<\/td>\n<\/tr>\n | \n\t| Rockwell hardness, HRB<\/td> | min.<\/td> | 67<\/td> | 71<\/td> | 79<\/td> | 82<\/td> | 89<\/td> | -<\/td>\n<\/tr>\n | \n\t| <\/td> | max.<\/td> | 95,0\u00a0g<\/td> | 99,5<\/td> | -<\/td>\n<\/tr>\n | \n\t| Rockwell hardness, HRC<\/td> | min.<\/td> | -<\/td> | 22<\/td> | 23<\/td> | 28<\/td> | 32<\/td> | 39<\/td>\n<\/tr>\n | \n\t| <\/td> | max.<\/td> | -<\/td> | 32<\/td> | 34<\/td> | 37<\/td> | 39<\/td> | 44<\/td>\n<\/tr>\n | \n\t| Surface hardness, HV 0,3<\/td> | max.<\/td> | -<\/td> | -<\/td> | 390<\/td> | 435<\/td>\n<\/tr>\n | \n\t| Non-carburization, HV 0,3<\/td> | max.<\/td> | -<\/td> | h<\/sup><\/td>| h<\/td> | h<\/td>\n<\/tr>\n | \n\t| Height of non-decarburized thread zone, E, mm<\/td> | min.<\/td> | -<\/td> | 1\/2 H1<\/td> | 2\/3 H1<\/td> | 3\/4 H1<\/td>\n<\/tr>\n | \n\t| Depth of complete decarburization in the thread, G, mm<\/td> | max.<\/td> | -<\/td> | 15<\/td>\n<\/tr>\n | \n\t| Reduction of hardness after retempering, HV<\/td> | max.<\/td> | -<\/td> | 20<\/td>\n<\/tr>\n | \n\tBreaking torque, MB<\/sup>, Nm<\/td>| min.<\/td> | -<\/td> | in accordance with ISO 898-7<\/td>\n<\/tr>\n | \n\tImpact strength, KV\u00a0i j<\/sup>, J<\/td>| min.<\/td> | -<\/td> | 27<\/td> | -<\/td> | 27<\/td> | 27<\/td> | 27<\/td> | 27<\/td> | k<\/td>\n<\/tr>\n | \n\t| Surface integrity in accordance with<\/td> | <\/td> | ISO 6157-1l<\/sup><\/td>ISO 6157-3<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\n<\/div><\/div><\/div><\/div><\/div>\n a<\/sup>\u00a0Values do not apply to structural bolting.<\/p>\n<\/div>\n<\/div>\n \n b<\/sup>\u00a0For structural bolting d \u2265 M12.<\/p>\n<\/div>\n<\/div>\n \n c<\/sup>\u00a0Nominal values are specified only for the purpose of the designation system for property classes. See Clause 5.<\/p>\n<\/div>\n<\/div>\n \n d<\/sup>\u00a0In cases where the lower yield strength, ReL<\/sup>, cannot be determined, it is permissible to measure the stress at 0,2 % non-proportional elongation Rp0,2<\/sup>.<\/p>\n<\/div>\n<\/div>\n \n e<\/sup>\u00a0For the property classes 4.8, 5.8 and 6.8, the values for Rpf,min<\/sup>\u00a0are under investigation. The values at the time of publication of this part of ISO 898 are given for calculation of the proof stress ratio only. They are not test values.<\/p>\n<\/div>\n<\/div>\n \n f<\/sup>\u00a0Proof loads are specified in Tables 5 and 7.<\/p>\n<\/div>\n<\/div>\n \n g<\/sup>\u00a0Hardness determined at the end of a fastener shall be 250 HV, 238 HB or 99,5 HRB maximum.<\/p>\n<\/div>\n<\/div>\n \n h<\/sup>\u00a0Surface hardness shall not be more than 30 Vickers points above the measured base metal hardness of the fastener when determination of both surface hardness and base metal hardness are carried out with HV 0,3 (see 9.11).<\/p>\n<\/div>\n<\/div>\n \n i<\/sup>\u00a0Values are determined at a test temperature of \u221220 \u00b0C (see 9.14).<\/p>\n<\/div>\n<\/div>\n \n j<\/sup>\u00a0Applies to d \u2265 16 mm.<\/p>\n<\/div>\n<\/div>\n \n k<\/sup>\u00a0Value for KV<\/sup>\u00a0is under investigation.<\/p>\n<\/div>\n<\/div>\n \n l<\/sup>\u00a0Instead of ISO 6157-1, ISO 6157-3 may apply by agreement between the manufacturer and the purchaser.<\/p>\n<\/div>\n<\/div><\/div><\/div><\/div><\/div><\/div> Let Us Help You Find Efficiencies<\/p>\n<\/div><\/div><\/div> CONTACT US<\/a><\/p>\n<\/div><\/div><\/div><\/div><\/div><\/div><\/div><\/div><\/p>","protected":false},"excerpt":{"rendered":"","protected":false},"author":38,"featured_media":11706,"parent":11686,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_acf_changed":false,"content-type":"","footnotes":""},"class_list":["post-11893","page","type-page","status-publish","has-post-thumbnail","hentry"],"acf":[],"_links":{"self":[{"href":"https:\/\/optimas.com\/en_gb\/wp-json\/wp\/v2\/pages\/11893","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/optimas.com\/en_gb\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/optimas.com\/en_gb\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/optimas.com\/en_gb\/wp-json\/wp\/v2\/users\/38"}],"replies":[{"embeddable":true,"href":"https:\/\/optimas.com\/en_gb\/wp-json\/wp\/v2\/comments?post=11893"}],"version-history":[{"count":0,"href":"https:\/\/optimas.com\/en_gb\/wp-json\/wp\/v2\/pages\/11893\/revisions"}],"up":[{"embeddable":true,"href":"https:\/\/optimas.com\/en_gb\/wp-json\/wp\/v2\/pages\/11686"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/optimas.com\/en_gb\/wp-json\/wp\/v2\/media\/11706"}],"wp:attachment":[{"href":"https:\/\/optimas.com\/en_gb\/wp-json\/wp\/v2\/media?parent=11893"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}} | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |