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Applicable to screw types as indicated by code symbols.
  • Types B and BP thread forming and Types BF and BT 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

Max. Head Dia. (A)

0.750 in

Min. Head Dia. (A)

0.710 in

Max. Head Side Height (H)

0.297 in

Min. Head Side Height (H)

0.273 in

Max. Total Head Height (O)

0.412 in

Min. Total Head Height (O)

0.362 in

Max. Slot Width (J)

0.106 in

Min. Slot Width (J)

0.091 in

Max. Slot Depth (T)

0.190 in

Min. Slot Depth (T)

0.151 in

Codes and Standards

Codes and Standards

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