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Unit:inch

Hexalobular Socket Head Cap Screws

ASME/ANSI B 18.3 (Table 1-III) - 2012

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美标ASME/ANSI B18.3 (Table 1-III) - 2012 A Hexalobular Socket Head Cap Screws
Size
2# 3# 4# 5# 6# 8# 10# 12# 1/4
d Screw Diameter
PP UNC
UNF
UNEF
ds max=nominal size
min
dk ① max
min
k max
min
A Ref.
t min
b min
c chamfer or radius max
r chamfer or radius max
R min
Socket No.
0.086 0.099 0.112 0.125 0.138 0.164 0.19 0.216 0.25
56 48 40 40 32 32 24 24 20
64 56 48 44 40 36 32 28 28
- - - - - - - 32 32
0.086 0.099 0.112 0.125 0.138 0.164 0.19 0.216 0.25
0.0822 0.0949 0.1075 0.1202 0.1329 0.1585 0.184 0.2095 0.2435
0.14 0.161 0.183 0.205 0.226 0.27 0.312 0.324 0.375
0.134 0.154 0.176 0.198 0.216 0.257 0.298 0.314 0.354
0.086 0.099 0.112 0.125 0.138 0.164 0.19 0.216 0.25
0.083 0.095 0.108 0.121 0.134 0.159 0.185 0.21 0.244
0.094 0.094 0.111 0.111 0.132 0.178 0.2 0.2 0.221
0.019 0.019 0.022 0.022 0.026 0.036 0.040 0.040 0.044
0.62 0.62 0.75 0.75 0.75 0.88 0.88 0.88 1
0.008 0.008 0.009 0.012 0.013 0.014 0.018 0.022 0.025
0.007 0.007 0.008 0.008 0.008 0.008 0.008 0.01 0.01
0.003 0.004 0.004 0.005 0.005 0.006 0.006 - 0.007
T8 T8 T10 T10 T15 T25 T27 T27 T30
Size
5/16 3/8 7/16 1/2 9/16 5/8 3/4 7/8 1
d Screw Diameter
PP UNC
UNF
UNEF
ds max=nominal size
min
dk ① max
min
k max
min
A Ref.
t min
b min
c chamfer or radius max
r chamfer or radius max
R min
Socket No.
0.3125 0.375 0.4375 0.5 0.5625 0.625 0.75 0.875 1
18 16 14 13 12 11 10 9 8
24 24 20 20 18 18 16 14 12
32 32 28 28 24 24 20 20 20
0.3125 0.375 0.4375 0.5 0.5625 0.625 0.75 0.875 1
0.3053 0.3678 0.4294 0.4919 0.5538 0.6163 0.7406 0.8647 0.9886
0.469 0.562 0.656 0.75 0.843 0.938 1.125 1.312 1.5
0.446 0.54 0.631 0.725 0.827 0.914 1.094 1.291 1.476
0.312 0.375 0.438 0.5 0.562 0.625 0.75 0.875 1
0.306 0.368 0.43 0.492 0.554 0.616 0.74 0.864 0.988
0.312 0.352 0.446 0.446 0.529 0.619 0.795 0.882 0.882
0.055 0.062 0.078 0.078 0.093 0.108 0.139 0.154 0.154
1.12 1.25 1.38 1.5 1.5 1.75 2 2.25 2.5
0.033 0.04 0.047 0.055 0.062 0.07 0.085 0.1 0.114
0.01 0.01 0.015 0.015 0.015 0.015 0.015 0.02 0.02
0.009 0.012 0.014 0.016 - 0.021 0.025 0.031 0.034
T45 T50 T55 T55 T60 T70 T90 T100 T100
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