• 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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Unit of Measure
Items
Hex Washer Head Tapping Screws

Hex Washer Head Tapping Screw, with 0.0860" Nominal Dia.
Hex Washer Head Tapping Screws

Hex Washer Head Tapping Screw, with 0.0990" Nominal Dia.
Hex Washer Head Tapping Screws

Hex Washer Head Tapping Screw, with 0.1120" Nominal Dia.
Hex Washer Head Tapping Screws

Hex Washer Head Tapping Screw, with 0.1250" Nominal Dia.
Hex Washer Head Tapping Screws

Hex Washer Head Tapping Screw, with 0.1380" Nominal Dia.
Manufacturer N/A Industrial Fasteners Institute
Product N/A Tapping Screws
Codes and Standards N/A Abstract of ASME B18.6.4 1998
Unit of Measure N/A English
Nominal Size or Basic Screw Dia. N/A No. 2 N/A No. 3 N/A No. 4 N/A No. 5 N/A No. 6
Nominal Size or Basic Screw Dia. (Decimal) N/A 0.0860 in N/A 0.0990 in N/A 0.1120 in N/A 0.1250 in N/A 0.1380 in
Applicable to Screw Types1 N/A 1
2
3
N/A 1
2
3
N/A 1
2
3
4
N/A 1
2
3
4
N/A 1
2
3
4
Max. Width Across Flats (A) N/A 0.125 in N/A 0.125 in N/A 0.188 in N/A 0.188 in N/A 0.250 in
Min. Width Across Flats (A) N/A 0.120 in N/A 0.120 in N/A 0.181 in N/A 0.181 in N/A 0.244 in
Min. Width Across Corners (W) N/A 0.134 in N/A 0.134 in N/A 0.202 in N/A 0.202 in N/A 0.272 in
Max. Head Height (H) N/A 0.050 in N/A 0.055 in N/A 0.060 in N/A 0.070 in N/A 0.093 in
Min. Head Height (H) N/A 0.040 in N/A 0.044 in N/A 0.049 in N/A 0.058 in N/A 0.080 in
Max. Washer Dia. (B) N/A 0.166 in N/A 0.177 in N/A 0.243 in N/A 0.260 in N/A 0.328 in
Min. Washer Dia. (B) N/A 0.154 in N/A 0.163 in N/A 0.225 in N/A 0.240 in N/A 0.302 in
Max. Washer Thickness (U) N/A 0.016 in N/A 0.016 in N/A 0.019 in N/A 0.025 in N/A 0.025 in
Min. Washer Thickness (U) N/A 0.010 in N/A 0.010 in N/A 0.011 in N/A 0.015 in N/A 0.015 in
Min. Protrusion Beyond Gaging Ring (F) N/A 0.024 in N/A 0.026 in N/A 0.029 in N/A 0.035 in N/A 0.048 in
  • 1 1 = Circle, 2 = Diamond, 3 = Triangle, 4 = Square
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