ANSI/ASME B 18.6.3 - 2013 Dimensions of Plain and Slotted Hex Washer Head Screws


Unit: inch
美标ANSI/ASME B18.6.3 - 2013 ANSI/ASME18.6 Dimensions of Plain and Slotted Hex Washer Head Screws
美标ANSI/ASME B18.6.3 - 2013 ANSI/ASME18.6 Dimensions of Plain and Slotted Hex Washer Head Screws
Thread Size
d
2# 3# 4# 5# 6# 7# 8# 10# 12#
d Nominal Size
PP UNC
s min
max
e min
h max
min
dc max
min
c max
min
n max
min
t max
min
0.0860 0.0990 0.1120 0.1250 0.1380 0.1510 0.1640 0.1900 0.2160
56 48 40 40 32 - 32 24 24
0.125 0.125 0.188 0.188 0.250 0.250 0.250 0.312 0.312
0.120 0.120 0.181 0.181 0.244 0.244 0.244 0.305 0.305
0.134 0.134 0.202 0.202 0.272 0.272 0.272 0.340 0.340
0.050 0.055 0.060 0.070 0.093 0.093 0.110 0.120 0.155
0.040 0.044 0.049 0.058 0.080 0.080 0.096 0.105 0.139
0.166 0.177 0.243 0.260 0.328 0.328 0.348 0.414 0.432
0.154 0.163 0.225 0.240 0.302 0.302 0.322 0.384 0.398
0.016 0.016 0.019 0.025 0.025 0.029 0.031 0.031 0.039
0.010 0.010 0.011 0.015 0.015 0.017 0.019 0.019 0.022
- - 0.039 0.043 0.048 0.048 0.054 0.060 0.067
- - 0.031 0.035 0.039 0.039 0.045 0.050 0.056
- - 0.042 0.049 0.053 0.053 0.074 0.080 0.103
- - 0.025 0.030 0.033 0.033 0.052 0.057 0.077
Thread Size
d
14# 1/4 5/16 20# 24# 3/8 7/16 1/2
d Nominal Size
PP UNC
s min
max
e min
h max
min
dc max
min
c max
min
n max
min
t max
min
0.2420 0.2500 0.3125 0.3200 0.3720 0.3750 0.4375 0.5000
- 20 18 - - 16 14 13
0.375 0.375 0.500 0.500 0.562 0.562 0.625 0.750
0.367 0.367 0.489 0.489 0.551 0.551 0.610 0.735
0.409 0.409 0.545 0.545 0.614 0.614 0.682 0.820
0.190 0.190 0.230 0.230 0.295 0.295 0.348 0.400
0.172 0.172 0.208 0.208 0.270 0.270 0.321 0.367
0.520 0.520 0.676 0.676 0.780 0.780 0.870 1.040
0.480 0.480 0.624 0.624 0.720 0.720 0.790 0.960
0.050 0.050 0.055 0.055 0.063 0.063 0.073 0.085
0.030 0.030 0.035 0.035 0.037 0.037 0.043 0.050
0.075 0.075 0.084 0.084 0.084 0.094 0.094 0.106
0.064 0.064 0.072 0.072 0.072 0.081 0.081 0.091
0.111 0.111 0.134 0.134 0.134 0.168 0.175 0.195
0.083 0.083 0.100 0.100 0.100 0.131 0.140 0.155
②,Unless otherwise specified by purchaser, hex washer head screws are not slotted.
③,Fillet radius, R, at the edges and corners of the sides of the hex and the top of the washer shall not exceed 0.15 times the basic screw diameter.
④,Shape of indentation optional.
⑥,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.
⑦,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.
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