Applicable to screw types as indicated by code symbols.
  • Type AB thread forming.
  • Type A thread forming, except for short lengths.
  • 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.

No. 8

Nominal Size or Basic Screw Dia. (Decimal)

0.1640 in
Applicable to Screw Types1 1
2
3
4

Max. Head Dia. (A)

0.322 in

Min. Head Dia. (A)

0.306 in

Max. Head Height (H)

0.096 in

Min. Head Height (H)

0.085 in

Max. Head Radius (R)

0.052 in

Max. Slot Width (J)

0.054 in

Min. Slot Width (J)

0.045 in

Max. Slot Depth (T)

0.058 in

Min. Slot Depth (T)

0.045 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.