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

Manufacturer

Manufacturer

Industrial Fasteners Institute

Specifications

Product

Tapping Screws

Unit of Measure

English

Nominal Size or Basic Screw Dia.

No. 24

Nominal Size or Basic Screw Dia. (Decimal)

0.3720 in
Applicable to Screw Types1 2

Length for Types AB and A (L)

1 in

Max. Head Dia. (A)

0.711 in

Min. Head Dia. (A)

0.664 in

Ref. Head Side Height (H)

0.228 in

Ref. Head Crown Height (C)

0.116 in

Ref. Total Head Height (O)

0.344 in

Max. Slot Width (J)

0.094 in

Min. Slot Width (J)

0.081 in

Max. Slot Depth (T)

0.204 in

Min. Slot Depth (T)

0.168 in

Max. Protrusion Above Gaging Dia. (F)

0.181 in

Min. Protrusion Above Gaging Dia. (F)

0.138 in

Gaging Dia. (G)

0.648 in

Codes and Standards

Codes and Standards

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