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ASME B18.6.3 Slotted Flat Countersunk Head Machine Screws

ASME B18.6.3 Slotted Flat Countersunk Head Machine Screws

ASME B18.6.3 Slotted Flat Countersunk Head Machine Screws Dimensions (mm)

Nominal Size Machine Screw Length, L These Lengths or Shorter Are Undercut Head Diameter, A Head Height, H, Ref. 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.
#0000 0.533 - - - 1.016 0.889 0.279 0.203 0.102 0.178 0.076 - - -
#000 0.864 - - - 1.524 1.397 0.406 0.279 0.178 0.229 0.127 - - -
#00 1.194 - - - 2.210 2.032 0.711 0.432 0.254 0.356 0.229 - - -
#0 1.524 3.175 4.763 3.175 2.845 2.438 0.889 0.584 0.406 0.381 0.254 0.660 0.406 1.981
#1 1.854 3.175 4.763 2.381 3.480 3.048 1.092 0.660 0.483 0.483 0.305 0.711 0.406 2.565
#2 2.184 3.175 4.763 4.763 4.115 3.658 1.295 0.787 0.584 0.584 0.381 0.737 0.432 3.150
#3 2.515 3.175 5.556 5.556 4.750 4.242 1.499 0.889 0.686 0.686 0.432 0.787 0.457 3.759
#4 2.845 4.763 6.350 6.350 5.385 4.851 1.702 0.991 0.787 0.762 0.508 0.813 0.483 4.369
#5 3.175 4.763 6.350 6.350 6.020 5.461 1.905 1.092 0.889 0.864 0.559 0.864 0.508 4.978
#6 3.505 4.763 7.938 7.938 6.655 6.045 2.108 1.219 0.991 0.965 0.610 0.914 0.533 5.588
#7 3.835 - 9.525 9.525 7.290 6.655 2.311 1.219 0.991 1.041 0.686 0.940 0.559 6.172
#8 4.166 6.350 11.113 11.113 7.925 7.239 2.540 1.372 1.143 1.143 0.737 0.991 0.584 6.782
#10 4.826 7.938 12.700 12.700 9.195 8.458 2.946 1.524 1.270 1.346 0.864 1.067 0.635 7.950
#12 5.486 9.525 14.288 14.288 10.465 9.652 3.353 1.702 1.422 1.524 0.991 1.143 0.686 9.195
#14 6.147 - 15.875 - 11.735 10.846 3.759 1.905 1.626 1.727 1.118 1.245 0.737 10.414
1/4 6.350 11.113 15.875 15.875 12.116 11.227 3.886 1.905 1.626 1.778 1.168 1.270 0.737 10.770
#16 6.807 - 19.050 - 13.005 12.065 4.166 1.905 1.626 1.905 1.245 1.321 0.787 11.608
#18 7.468 - 20.638 - 14.249 13.259 4.572 2.134 1.829 2.108 1.372 1.397 0.838 12.827
5/16 7.938 12.700 20.638 15.875 15.164 14.122 4.851 2.134 1.829 2.235 1.473 1.448 0.864 13.691
#20 8.128 - 20.638 - 15.519 14.453 4.978 2.134 1.829 2.286 1.499 1.473 0.889 14.046
#24 9.449 - 25.400 - 18.059 16.866 5.791 2.388 2.057 2.667 1.753 1.651 0.991 16.459
3/8 9.525 14.288 - 15.875 18.212 17.018 5.842 2.388 2.057 2.692 1.778 1.651 0.991 16.586
7/16 11.113 15.875 - 19.050 19.304 18.161 5.664 2.388 2.057 2.616 1.676 1.854 1.118 17.526
1/2 12.700 19.050 - 19.050 20.701 19.431 5.664 2.692 2.311 2.616 1.651 2.057 1.245 18.771
9/16 14.288 - - - 23.673 22.301 6.604 2.997 2.591 3.048 1.956 2.261 1.346 21.615
5/8 15.875 - - - 26.670 25.146 7.569 3.378 2.946 3.480 2.235 2.464 1.473 24.435
3/4 19.050 - - - 32.639 30.861 9.449 3.785 3.327 4.343 2.819 2.845 1.702 30.124

ASME B18.6.3 Slotted Flat Countersunk Head Machine Screws Dimensions (Inch)

Nominal Size Machine Screw Length, L These Lengths or Shorter Are Undercut Head Diameter, A Head Height, H, Ref. 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.
#0000 0.0210 - - - 0.040 0.035 0.011 0.008 0.004 0.007 0.003 - - -
#000 0.0340 - - - 0.060 0.055 0.016 0.011 0.007 0.009 0.005 - - -
#00 0.0470 - - - 0.087 0.080 0.028 0.017 0.010 0.014 0.009 - - -
#0 0.0600 1/8 3/16 1/8 0.112 0.096 0.035 0.023 0.016 0.015 0.010 0.026 0.016 0.078
#1 0.0730 1/8 3/16 5/32 0.137 0.120 0.043 0.026 0.019 0.019 0.012 0.028 0.016 0.101
#2 0.0860 1/8 3/16 3/16 0.162 0.144 0.051 0.031 0.023 0.023 0.015 0.029 0.017 0.124
#3 0.0990 1/8 7/32 7/32 0.187 0.167 0.059 0.035 0.027 0.027 0.017 0.031 0.018 0.148
#4 0.1120 3/16 1/4 1/4 0.212 0.191 0.067 0.039 0.031 0.030 0.020 0.032 0.019 0.172
#5 0.1250 3/16 1/4 1/4 0.237 0.215 0.075 0.043 0.035 0.034 0.022 0.034 0.020 0.196
#6 0.1380 3/16 5/16 5/16 0.262 0.238 0.083 0.048 0.039 0.038 0.024 0.036 0.021 0.220
#7 0.1510 - 3/8 3/8 0.287 0.262 0.091 0.048 0.039 0.041 0.027 0.037 0.022 0.243
#8 0.1640 1/4 7/16 7/16 0.312 0.285 0.100 0.054 0.045 0.045 0.029 0.039 0.023 0.267
#10 0.1900 5/16 1/2 1/2 0.362 0.333 0.116 0.060 0.050 0.053 0.034 0.042 0.025 0.313
#12 0.2160 3/8 9/16 9/16 0.412 0.380 0.132 0.067 0.056 0.060 0.039 0.045 0.027 0.362
#14 0.2420 - 5/8 - 0.462 0.427 0.148 0.075 0.064 0.068 0.044 0.049 0.029 0.410
1/4 0.2500 7/16 5/8 5/8 0.477 0.442 0.153 0.075 0.064 0.070 0.046 0.050 0.029 0.424
#16 0.2680 - 3/4 - 0.512 0.475 0.164 0.075 0.064 0.075 0.049 0.052 0.031 0.457
#18 0.2940 - 13/16 - 0.561 0.522 0.180 0.084 0.072 0.083 0.054 0.055 0.033 0.505
5/16 0.3125 1/2 13/16 5/8 0.597 0.556 0.191 0.084 0.072 0.088 0.058 0.057 0.034 0.539
#20 0.3200 - 13/16 - 0.611 0.569 0.196 0.084 0.072 0.090 0.059 0.058 0.035 0.553
#24 0.3720 - 1 - 0.711 0.664 0.228 0.094 0.081 0.105 0.069 0.065 0.039 0.648
3/8 0.3750 9/16 - 5/8 0.717 0.670 0.230 0.094 0.081 0.106 0.070 0.065 0.039 0.653
7/16 0.4375 5/8 - 3/4 0.760 0.715 0.223 0.094 0.081 0.103 0.066 0.073 0.044 0.690
1/2 0.5000 3/4 - 3/4 0.815 0.765 0.223 0.106 0.091 0.103 0.065 0.081 0.049 0.739
9/16 0.5625 - - - 0.932 0.878 0.260 0.118 0.102 0.120 0.077 0.089 0.053 0.851
5/8 0.6250 - - - 1.050 0.990 0.298 0.133 0.116 0.137 0.088 0.097 0.058 0.962
3/4 0.7500 - - - 1.285 1.215 0.372 0.149 0.131 0.171 0.111 0.112 0.067 1.186