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.
This type of recess consists of two intersecting slots with parallel sides converging to a slightly truncated apex at bottom of recess.
Unit of Measure

Manufacturer

Manufacturer

Industrial Fasteners Institute

Specifications

Product

Tapping Screws

Unit of Measure

English

Type

Type II

Nominal Size or Basic Screw Dia.

No. 5

Nominal Size or Basic Screw Dia. (Decimal)

0.1250 in
Applicable to Screw Types1 1
2
3
4

Max. Head Dia. (A)

0.245 in

Min. Head Dia. (A)

0.231 in

Max. Head Height (H)

0.089 in

Min. Head Height (H)

0.079 in

Min. Head Radius (R)

0.015 in

Ref. Recess Dia. (M)

0.152 in

Ref. Recess Depth (T)

0.083 in

Ref. Recess Width (N)

0.034 in

Driver Size

2

Max. Recess Penetration Gaging Depth

0.066 in

Min. Recess Penetration Gaging Depth

0.052 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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