Applicable to screw types as indicated by code symbols.
  • Types B and BP thread forming and Types BF and BT thread cutting.
  • Type C thread forming and Types D, F, G, and T thread cutting.
Unit of Measure

Manufacturer

Manufacturer

Industrial Fasteners Institute

Specifications

Product

Tapping Screws

Unit of Measure

English

Nominal Size or Basic Screw Dia.

7/16 in

Nominal Size or Basic Screw Dia. (Decimal)

0.4375 in
Applicable to Screw Types1 3
4

Max. Width Across Flats (A)

0.625 in

Min. Width Across Flats (A)

0.610 in

Min. Width Across Corners (W)

0.682 in

Max. Head Height (H)

0.348 in

Min. Head Height (H)

0.321 in

Max. Washer Dia. (B)

0.870 in

Min. Washer Dia. (B)

0.790 in

Max. Washer Thickness (U)

0.073 in

Min. Washer Thickness (U)

0.043 in

Min. Protrusion Beyond Gaging Ring (F)

0.193 in

Codes and Standards

Codes and Standards

Abstract of ASME B18.6.4 1998
  • 1 1 = Circle, 2 = Diamond, 3 = Triangle, 4 = Square
Use trailing wildcard (*) for broader results.