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  • Where specifying nominal size in decimals, zeros preceding decimal and in the fourth decimal place shall be omitted.
This type of recess has a large center opening, wide straight wings, and blunt bottom, with all edges relieved or rounded.
Unit of Measure

Manufacturer

Manufacturer

Industrial Fasteners Institute

Specifications

Product

Tapping Screws

Unit of Measure

English

Type

Type IA

Nominal Size or Basic Screw Dia.

No. 12

Nominal Size or Basic Screw Dia. (Decimal)

0.2160 in

Ref. Recess Dia. (M)

0.198 in

Ref. Recess Depth (T)

0.127 in

Ref. Recess Width (N)

0.041 in

Driver Size

2

Max. Recess Penetration Gaging Depth

0.122 in

Min. Recess Penetration Gaging Depth

0.104 in

Codes and Standards

Codes and Standards

Abstract of ASME B18.6.4 1998