Nominal thread diameter ddh a, bmin.max.r1 cNominal thread diameter ddh a, bmin.max.r1 c33,43,580,71617,517,771,33,53,94,080,7182020,331,344,54,680,7202222,331,655,55,680,7222424,331,666,66,820,7242626,331,677,67,820,8273030,331,6899,220,8303333,391,6101111,270,8333636,391,61213,513,770,8363939,391,61415,515,771,3394242,391,6a b cMedium series according to ISO 273.For square neck bolts, the hole shall be adapted to accommodate the square neck. For product grade C, a radius r1 should be used according to the following equation:r1=rmax +0,2wherermax =damax −dsmin 2Table 16 — Wedge angle, α, for tensile test under wedge loadingNominal thread diameterdmmProperty classes forbolts and screws with unthreaded shank lengthls W 2 dscrews threaded to the head and bolts and screws with unthreaded shank lengthls < 2 d4.6, 4.8, 5.6, 5.8, 6.8, 8.8, 9.8, 10.912.9/12.94.6, 4.8, 5.6, 5.8, 6.8, 8.8, 9.8, 10.912.9/12.9α ± 30'3 u d u 2010°6°6°4°20 < d u 396°4°4°4°For finished bolts and screws with head-bearing diameters above 1,7d that fail the wedge tensile test, the head may be machined to 1,7 d and re-tested on the wedge angle specified in Table 16.Moreover, for finished bolts and screws with head-bearing diameters above 1,9 d, the 10° wedge angle may be reduced to 6°.9.1.5 Test procedureThe fastener shall be tested as received.© ISO 2009 – All rights reserved 23
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