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

Manufacturer

Manufacturer

N/A Industrial Fasteners Institute

Specifications

Product

N/A Tapping Screws

Unit of Measure

N/A English

Nominal Size or Basic Screw Dia.

N/A No. 20

Nominal Size or Basic Screw Dia. (Decimal)

N/A 0.3200 in
Applicable to Screw Types1 N/A 2

Max. Head Dia. (A)

N/A 0.631 in

Min. Head Dia. (A)

N/A 0.608 in

Max. Head Height (H)

N/A 0.182 in

Min. Head Height (H)

N/A 0.166 in

Max. Head Radius (R)

N/A 0.121 in

Max. Slot Width (J)

N/A 0.084 in

Min. Slot Width (J)

N/A 0.072 in

Max. Slot Depth (T)

N/A 0.108 in

Min. Slot Depth (T)

N/A 0.087 in

Codes and Standards

Codes and Standards

N/A Abstract of ASME B18.6.4 1998
  • 1 1 = Circle, 2 = Diamond, 3 = Triangle, 4 = Square
Use trailing wildcard (*) for broader results.