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ASME B18.6.3 Slotted Undercut 82-deg Flat Countersunk Head Screw

ASME B18.6.3 Slotted Undercut 82-deg Flat Countersunk Head Screw

ASME B18.6.3 Slotted Undercut 82-deg Flat Countersunk Head Screw Dimensions (mm)

Nominal Size or Basic Screw Diameter Machine Screw Length, L These Lengths or Shorter Are Undercut, L Head Diameter, A Head Height, H Slot Width, J Slot Depth, T Protrusion Above Gaging Diameter, F Gaging Diameter, G
Type A & AB Tapping Screws Other Types of Tapping Screws Max. Min. Max. Min. Max. Min. Max. Min. Max. Min.
0 - 0.0600 3.175 4.762 3.175 2.845 2.438 0.635 0.457 0.584 0.406 0.279 0.178 - - -
1 - 0.0730 3.175 4.762 3.969 3.480 3.048 0.787 0.584 0.660 0.483 0.356 0.229 - - -
2 - 0.0860 3.175 4.762 4.762 4.115 3.658 0.914 0.711 0.787 0.584 0.406 0.279 0.737 0.432 3.150
3 - 0.0990 3.175 5.556 5.556 4.750 4.242 1.067 0.838 0.889 0.686 0.483 0.305 0.787 0.457 3.759
4 - 0.1120 4.762 6.350 6.350 5.385 4.851 1.194 0.965 0.991 0.787 0.559 0.356 0.813 0.483 4.369
5 - 0.1250 4.762 6.350 6.350 6.020 5.461 1.346 1.092 1.092 0.889 0.610 0.406 0.864 0.508 4.978
6 - 0.1380 4.762 7.938 7.938 6.655 6.045 1.499 1.219 1.219 0.991 0.686 0.432 0.914 0.533 5.588
8 - 0.1640 6.350 11.112 11.112 7.925 7.239 1.778 1.473 1.372 1.143 0.813 0.533 0.991 0.584 6.782
10 - 0.1900 7.938 12.700 12.700 9.195 8.458 2.057 1.727 1.524 1.270 0.940 0.610 1.067 0.635 7.950
1/4 - 0.2500 11.112 15.875 15.875 12.116 11.227 2.718 2.337 1.905 1.626 1.270 0.813 1.270 0.737 10.770
5/16 - 0.3125 12.700 20.638 15.875 15.164 14.122 3.404 2.946 2.134 1.829 1.575 1.041 1.448 0.864 13.691
3/8 - 0.3750 14.288 ... 15.875 18.212 17.018 4.089 3.556 2.388 2.057 1.905 1.245 1.651 0.991 16.586

ASME B18.6.3 Slotted Undercut 82-deg Flat Countersunk Head Screw Dimensions (Inch)

Nominal Size or Basic Screw Diameter Machine Screw Length, L These Lengths or Shorter Are Undercut, L Head Diameter, A Head Height, H Slot Width, J Slot Depth, T Protrusion Above Gaging Diameter, F Gaging Diameter, G
Type A & AB Tapping Screws Other Types of Tapping Screws Max. Min. Max. Min. Max. Min. Max. Min. Max. Min.
0 - 0.0600 1/8 3/16 1/8 0.112 0.096 0.025 0.018 0.023 0.016 0.011 0.007 - - -
1 - 0.0730 1/8 3/16 5/32 0.137 0.120 0.031 0.023 0.026 0.019 0.014 0.009 - - -
2 - 0.0860 1/8 3/16 3/16 0.162 0.144 0.036 0.028 0.031 0.023 0.016 0.011 0.029 0.017 0.124
3 - 0.0990 1/8 7/32 7/32 0.187 0.167 0.042 0.033 0.035 0.027 0.019 0.012 0.031 0.018 0.148
4 - 0.1120 3/16 1/4 1/4 0.212 0.191 0.047 0.038 0.039 0.031 0.022 0.014 0.032 0.019 0.172
5 - 0.1250 3/16 1/4 1/4 0.237 0.215 0.053 0.043 0.043 0.035 0.024 0.016 0.034 0.020 0.196
6 - 0.1380 3/16 5/16 5/16 0.262 0.238 0.059 0.048 0.048 0.039 0.027 0.017 0.036 0.021 0.220
8 - 0.1640 1/4 7/16 7/16 0.312 0.285 0.070 0.058 0.054 0.045 0.032 0.021 0.039 0.023 0.267
10 - 0.1900 5/16 1/2 1/2 0.362 0.333 0.081 0.068 0.060 0.050 0.037 0.024 0.042 0.025 0.313
1/4 - 0.2500 7/16 5/8 5/8 0.477 0.442 0.107 0.092 0.075 0.064 0.050 0.032 0.050 0.029 0.424
5/16 - 0.3125 1/2 13/16 5/8 0.597 0.556 0.134 0.116 0.084 0.072 0.062 0.041 0.057 0.034 0.539
3/8 - 0.3750 9/16 ... 5/8 0.717 0.670 0.161 0.140 0.094 0.081 0.075 0.049 0.065 0.039 0.653