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Unit:inch

Cross Recess Indented Regular and Large Hex Head Screws

ASME B 18.6.3 (T30-I) - 2013

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美标ASME B18.6.3 (T30-I) - 2013 ASME18.6.3 Cross Recess Indented Regular and Large Hex Head Screws
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Thread Size
d
1# 2# 3# 4# 5# 6# 7# 8#
d Nominal Size
PP
M Ref.
Socket No.
P max
min
s1 Regular Head max
min
s2 Large Head max
min
e1 Regular Head min
e2 Large Head min
k max
min
0.0730 0.0860 0.0990 0.1120 0.1250 0.1380 0.1510 0.1640
64 56 48 40 40 32 / 32
0.072 0.086 0.092 0.097 0.105 0.148 0.148 0.168
0 1 1 1 1 2 2 2
0.054 0.054 0.060 0.067 0.076 0.089 0.089 0.115
0.036 0.036 0.042 0.049 0.058 0.064 0.064 0.090
0.125 0.125 0.188 0.188 0.188 0.250 0.250 0.250
0.120 0.120 0.181 0.181 0.181 0.244 0.244 0.244
/ / / 0.219 0.250 / / 0.312
/ / / 0.213 0.244 / / 0.305
0.134 0.134 0.202 0.202 0.202 0.272 0.272 0.272
/ / / 0.238 0.272 / / 0.340
0.044 0.050 0.055 0.060 0.070 0.093 0.093 0.110
0.036 0.040 0.044 0.049 0.058 0.080 0.080 0.096
Thread Size
d
10# 12# 14# 1/4 5/16 20# 24# 3/8
d Nominal Size
PP
M Ref.
Socket No.
P max
min
s1 Regular Head max
min
s2 Large Head max
min
e1 Regular Head min
e2 Large Head min
k max
min
0.1900 0.2160 0.2420 0.2500 0.3125 0.3200 0.3720 0.3750
24 24 / 20 18 / / 16
0.178 0.247 0.277 0.277 0.359 0.359 0.387 0.387
2 3 3 3 4 4 4 4
0.127 0.152 0.186 0.186 0.234 0.234 0.267 0.267
0.102 0.127 0.161 0.161 0.210 0.210 0.243 0.243
0.312 0.312 0.375 0.375 0.500 0.500 0.562 0.562
0.305 0.305 0.367 0.367 0.489 0.489 0.551 0.551
/ 0.375 0.438 0.438 / / / /
/ 0.367 0.428 0.428 / / / /
0.340 0.340 0.409 0.409 0.545 0.545 0.614 0.614
/ 0.409 0.477 0.477 / / / /
0.120 0.155 0.190 0.190 0.230 0.230 0.295 0.295
0.105 0.139 0.172 0.172 0.208 0.208 0.270 0.270
①,A slight rounding of all edges and comers of the hex surfaces of indented hex heads shall be permissible, provided the diameter of the bearing circle is equal to no less than 90% of the specified minimum width-across-flats dimension.
②,Where specifying nominal size in decimals, zeros preceding the decimal and in the fourth decimal place shall be omitted.
③,Sizes 7, 14, 20, and 24 are for tapping screws only.
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