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  5. ASME B18.6.3 Close Tolerance 100 Degree Flat Countersunk Head Machine Screws

ASME B18.6.3 Close Tolerance 100 Degree Flat Countersunk Head Machine Screws

ASME B18.6.3 Close Tolerance 100 Degree Flat Countersunk Head Machine Screws

ASME B18.6.3 Close Tolerance 100 Degree Flat Countersunk Head Machine Screws Dimensions (mm)

Nominal Size Head Diameter, A Head Height, H Slot Width, J Slot Depth, T Protrusion Above Gaging Diameter, F Gaging Diameter, G
Max. Min. Ref. Max. Min. Max. Min. Max. Min.
4 2.845 5.385 4.775 1.245 0.991 0.787 0.610 0.432 0.635 0.483 4.242
6 3.505 6.655 5.969 1.524 1.219 0.991 0.762 0.559 0.711 0.533 5.436
8 4.166 7.925 7.163 1.829 1.372 1.143 0.914 0.686 0.787 0.584 6.629
10 4.826 9.195 8.357 2.108 1.524 1.270 1.067 0.787 0.864 0.660 7.798
1/4 6.350 12.116 11.100 2.794 1.905 1.626 1.397 1.067 1.016 0.787 10.541
5/16 7.938 15.164 13.970 3.505 2.134 1.829 1.753 1.346 1.194 0.940 13.360
3/8 9.525 18.212 16.815 4.191 2.388 2.057 2.108 1.651 1.346 1.067 16.205
7/16 11.113 21.260 19.660 4.902 2.388 2.057 2.464 1.930 1.524 1.194 19.050
1/2 12.700 24.308 22.530 5.613 2.692 2.311 2.819 2.235 1.676 1.346 21.895
9/16 14.288 27.356 25.400 6.325 2.997 2.591 3.175 2.515 1.854 1.473 24.740
5/8 15.875 30.404 28.245 7.010 3.378 2.946 3.531 2.819 2.032 1.600 27.584

ASME B18.6.3 Close Tolerance 100 Degree Flat Countersunk Head Machine Screws Dimensions (Inch)

Nominal Size Head Diameter, A Head Height, H Slot Width, J Slot Depth, T Protrusion Above Gaging Diameter, F Gaging Diameter, G
Max. Min. Ref. Max. Min. Max. Min. Max. Min.
4 0.1120 0.212 0.188 0.049 0.039 0.031 0.024 0.017 0.025 0.019 0.167
6 0.1380 0.262 0.235 0.060 0.048 0.039 0.030 0.022 0.028 0.021 0.214
8 0.1640 0.312 0.282 0.072 0.054 0.045 0.036 0.027 0.031 0.023 0.261
10 0.1900 0.362 0.329 0.083 0.060 0.050 0.042 0.031 0.034 0.026 0.307
1/4 0.2500 0.477 0.437 0.110 0.075 0.064 0.055 0.042 0.040 0.031 0.415
5/16 0.3125 0.597 0.550 0.138 0.084 0.072 0.069 0.053 0.047 0.037 0.526
3/8 0.3750 0.717 0.662 0.165 0.094 0.081 0.083 0.065 0.053 0.042 0.638
7/16 0.4375 0.837 0.774 0.193 0.094 0.081 0.097 0.076 0.060 0.047 0.750
1/2 0.5000 0.957 0.887 0.221 0.106 0.091 0.111 0.088 0.066 0.053 0.862
9/16 0.5625 1.077 1.000 0.249 0.118 0.102 0.125 0.099 0.073 0.058 0.974
5/8 0.6250 1.197 1.112 0.276 0.133 0.116 0.139 0.111 0.080 0.063 1.086