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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.

7/16 in

Nominal Size or Basic Screw Dia. (Decimal)

0.4375 in
Applicable to Screw Types1 3

Max. Head Dia. (A)

0.625 in

Min. Head Dia. (A)

0.589 in

Max. Head Side Height (H)

0.265 in

Min. Head Side Height (H)

0.242 in

Max. Total Head Height (O)

0.368 in

Min. Total Head Height (O)

0.321 in

Max. Slot Width (J)

0.094 in

Min. Slot Width (J)

0.081 in

Max. Slot Depth (T)

0.170 in

Min. Slot Depth (T)

0.135 in

Codes and Standards

Codes and Standards

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