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Unit:inch

Hexalobular Socket Round Head Screws with Collar [TABLE 2.2.12-2 VI]

ASME B 18.6.3 (H12B-VI) - 2024

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美标ASME B18.6.3 (H12B-VI) - 2024 ASME18.6 Hexalobular Socket Round Head Screws with Collar [TABLE 2.2.12-2 VI]
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 *Models with different eras.

Thread Size
d
2# 3# 4# 5# 6# 8# 10# 12# 1/4 5/16 3/8 7/16 1/2
d Nominal Size
PP
M Ref.
Socket No.
P max
min
dk Ref.
dc max
min
k max
min
c Ref.
0.0860 0.0990 0.1120 0.1250 0.1380 0.1640 0.1900 0.2160 0.2500 0.3125 0.3750 0.4375 0.5000
56 48 40 40 32 32 24 24 20 18 16 14 13
0.081 0.094 0.111 0.111 0.132 0.155 0.178 0.200 0.221 0.266 0.312 0.352 0.446
T7 T8 T9 T10 T15 T20 T25 T27 T30 T40 T45 T50 T55
0.035 0.035 0.040 0.045 0.060 0.065 0.075 0.080 0.090 0.120 0.130 0.150 0.170
0.030 0.030 0.035 0.035 0.050 0.050 0.060 0.065 0.075 0.105 0.115 0.135 0.155
0.136 0.156 0.177 0.198 0.218 0.259 0.300 0.341 0.396 0.494 0.593 0.691 0.790
0.202 0.232 0.261 0.291 0.321 0.380 0.439 0.498 0.576 0.719 0.861 1.004 1.146
0.186 0.215 0.243 0.272 0.301 0.358 0.416 0.473 0.548 0.687 0.825 0.963 1.101
0.062 0.070 0.079 0.088 0.096 0.113 0.130 0.148 0.170 0.211 0.253 0.294 0.335
0.050 0.058 0.067 0.075 0.084 0.101 0.118 0.134 0.157 0.197 0.238 0.278 0.319
0.030 0.030 0.030 0.040 0.040 0.040 0.050 0.050 0.050 0.060 0.060 0.070 0.090
①,Where specifying nominal size in decimals, zeros preceding the decimal and in the fourth decimal place shall be omitted.
②,Machine Screw Length of Thread 1) Sizes No.5 and smaller. Screws of nominal lengths equal to three diameters and shorter shall have full-form threads extending to within one pitch (thread) of the bearing surface of the head, or closer, if practicable. Nominal lengths greater than three diameters, up to and including 1-1/8 in., shall have full-form threads extending to within two pitches (threads) of the bearing surface of the head, or closer, if practicable. Screws of longer nominal lengths shall, unless otherwise specified, have a minimum length of full-form thread of 1 in. 2) Sizes No.6 and smaller. Screws of nominal lengths equal to three diameters and shorter shall have full-form threads extending to within one pitch (thread) of the bearing surface of the head, or closer, if practicable. Nominal lengths greater than three diameters, up to and including 2 in., shall have full-form threads extending to within two pitches (threads) of the bearing surface of the head, or closer, if practicable. Screws of longer nominal lengths shall have a minimum length of full-form thread of 1.5 in. unless otherwise specified.
③,The diameter of body on machine screws having other than trim heads shall not be less than the Class 2A thread minimum pitch diameter nor greater than the basic major diameter of the thread.

Alternative history

ASME B 18.6.3T39-VI - 2013 ASME B 18.6.3H12B-VI - 2024
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