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.

1/2 in

Nominal Size or Basic Screw Dia. (Decimal)

0.5000 in
Applicable to Screw Types1 3
4

Max. Width Across Flats (A)

0.750 in

Min. Width Across Flats (A)

0.735 in

Min. Width Across Corners (W)

0.820 in

Max. Head Height (H)

0.400 in

Min. Head Height (H)

0.367 in

Min. Protrusion Beyond Gaging Ring (F)

0.220 in

Codes and Standards

Codes and Standards

Abstract of ASME B18.6.4 1998
  • 1 1 = Circle, 2 = Diamond, 3 = Triangle, 4 = Square
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