• Hex Washer Head Tapping Screws
  • Type Designations for Tapping Screws and Metallic Drive Screws
  • Where specifying nominal size in decimals, zeros preceding decimal and in the fourth decimal place shall be omitted.
  • Applicable to screw types as indicated by code symbols.
    Type AB thread forming.
    Types B and BP thread forming and Types BF and BT thread cutting.
    Type C thread forming, Appendix; and Types D, F, G, and T thread cutting.
  • A slight rounding of all edges and corners of the hex surfaces of heads shall be permissible.
  • Fillet radius R at junction of sides of hex and top of washer shall not exceed 0.15 times the basic screw diameter.
  • Dimensions across flats and across corners of the head shall be measured at the point of maximum metal. Taper of sides of hex (angle between one side and the axis) shall not exceed 2º or 0.004 in., whichever is greater, the specified width across flats being the large dimension.
  • The rounding due to lack of fill on all six corners of the head shall be reasonably uniform and the width across corners of the head shall be such that when a sharp ring having an inside diameter equal to the specified minimum width across corners is placed on the top of the head, the hex portion of the head shall protrude by an amount equal to, or greater than, the F value tabulated.
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Item #

Description

Nominal Size or Basic Screw Dia.

Max. (A)

Min. (W)

Max. (H)

Max. (B)

Max. (U)

N/A Hex Washer Head Tapping Screw, with 0.0860" Nominal Dia. N/A No. 2 N/A 0.125 in N/A 0.134 in N/A 0.050 in N/A 0.166 in N/A 0.016 in
N/A Hex Washer Head Tapping Screw, with 0.0990" Nominal Dia. N/A No. 3 N/A 0.125 in N/A 0.134 in N/A 0.055 in N/A 0.177 in N/A 0.016 in
N/A Hex Washer Head Tapping Screw, with 0.1120" Nominal Dia. N/A No. 4 N/A 0.188 in N/A 0.202 in N/A 0.060 in N/A 0.243 in N/A 0.019 in
N/A Hex Washer Head Tapping Screw, with 0.1250" Nominal Dia. N/A No. 5 N/A 0.188 in N/A 0.202 in N/A 0.070 in N/A 0.260 in N/A 0.025 in
N/A Hex Washer Head Tapping Screw, with 0.1380" Nominal Dia. N/A No. 6 N/A 0.250 in N/A 0.272 in N/A 0.093 in N/A 0.328 in N/A 0.025 in
N/A Hex Washer Head Tapping Screw, with 0.1510" Nominal Dia. N/A No. 7 N/A 0.250 in N/A 0.272 in N/A 0.093 in N/A 0.328 in N/A 0.029 in
N/A Hex Washer Head Tapping Screw, with 0.1640" Nominal Dia. N/A No. 8 N/A 0.250 in N/A 0.272 in N/A 0.110 in N/A 0.348 in N/A 0.031 in
N/A Hex Washer Head Tapping Screw, with 0.1900" Nominal Dia. N/A No. 10 N/A 0.312 in N/A 0.340 in N/A 0.120 in N/A 0.414 in N/A 0.031 in
N/A Hex Washer Head Tapping Screw, with 0.2160" Nominal Dia. N/A No. 12 N/A 0.312 in N/A 0.340 in N/A 0.155 in N/A 0.432 in N/A 0.039 in
N/A Hex Washer Head Tapping Screw, with 0.2420" Nominal Dia. N/A No. 14 N/A 0.375 in N/A 0.409 in N/A 0.190 in N/A 0.520 in N/A 0.050 in
N/A Hex Washer Head Tapping Screw, with 0.2500" Nominal Dia. N/A 1/4 in N/A 0.375 in N/A 0.409 in N/A 0.190 in N/A 0.520 in N/A 0.050 in
N/A Hex Washer Head Tapping Screw, with 0.3125" Nominal Dia. N/A 5/16 in N/A 0.500 in N/A 0.545 in N/A 0.230 in N/A 0.676 in N/A 0.055 in
N/A Hex Washer Head Tapping Screw, with 0.3200" Nominal Dia. N/A No. 20 N/A 0.500 in N/A 0.545 in N/A 0.230 in N/A 0.676 in N/A 0.055 in
N/A Hex Washer Head Tapping Screw, with 0.3720" Nominal Dia. N/A No. 24 N/A 0.562 in N/A 0.614 in N/A 0.295 in N/A 0.780 in N/A 0.063 in
N/A Hex Washer Head Tapping Screw, with 0.3750" Nominal Dia. N/A 3/8 in N/A 0.562 in N/A 0.614 in N/A 0.295 in N/A 0.780 in N/A 0.063 in
N/A Hex Washer Head Tapping Screw, with 0.4375" Nominal Dia. N/A 7/16 in N/A 0.625 in N/A 0.682 in N/A 0.348 in N/A 0.870 in N/A 0.073 in
N/A Hex Washer Head Tapping Screw, with 0.5000" Nominal Dia. N/A 1/2 in N/A 0.750 in N/A 0.820 in N/A 0.400 in N/A 1.040 in N/A 0.085 in
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