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ASTM F837 F468

ASME B 18.6.3 - 2013 

Dimensions of Slotted Binding Head Screws

(Machine Screws Only)

(ASTM F837, F468)

Thread Size
d
0000# 000# ④ 00# ④ 0# 1# 2# 3# 4#
d Nominal Size
PP UNC
dk max
min
k max
min
f max
min
n max
min
t max
min
0.0210 0.0340 0.0470 0.0600 0.0730 0.0860 0.0990 0.1120
160 120 90 80 64 56 48 40
0.046 0.073 0.098 0.126 0.153 0.181 0.208 0.235
0.040 0.067 0.090 0.119 0.145 0.171 0.197 0.223
0.014 0.021 0.028 0.032 0.041 0.050 0.059 0.068
0.009 0.015 0.023 0.026 0.035 0.043 0.052 0.061
0.006 0.008 0.011 0.012 0.015 0.018 0.022 0.025
0.003 0.005 0.007 0.008 0.011 0.013 0.016 0.018
0.008 0.012 0.017 0.023 0.026 0.031 0.035 0.039
0.004 0.006 0.010 0.016 0.019 0.023 0.027 0.031
0.009 0.013 0.018 0.018 0.024 0.030 0.036 0.042
0.005 0.009 0.012 0.009 0.014 0.020 0.025 0.030
Thread Size
d
5# 6# 8# 10# 12# 1/4 5/16 3/8
d Nominal Size
PP UNC
dk max
min
k max
min
f max
min
n max
min
t max
min
0.1250 0.1380 0.1640 0.1900 0.2160 0.2500 0.3125 0.3750
40 32 32 24 24 20 18 16
0.263 0.290 0.344 0.399 0.454 0.525 0.656 0.788
0.249 0.275 0.326 0.378 0.430 0.498 0.622 0.746
0.078 0.087 0.105 0.123 0.141 0.165 0.209 0.253
0.069 0.078 0.095 0.112 0.130 0.152 0.194 0.235
0.029 0.032 0.039 0.045 0.052 0.061 0.077 0.094
0.021 0.024 0.029 0.034 0.039 0.046 0.059 0.071
0.043 0.048 0.054 0.060 0.067 0.075 0.084 0.094
0.035 0.039 0.045 0.050 0.056 0.064 0.072 0.081
0.048 0.053 0.065 0.077 0.089 0.105 0.134 0.163
0.035 0.040 0.050 0.060 0.070 0.084 0.108 0.132
②,Break sharp edge on head where spherical and conical surfaces meet.
③,Unless otherwise specified by purchaser, slotted binding head machine screws shall not be undercut.
⑤,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.
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.
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