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.
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. 8

Nominal Size or Basic Screw Dia. (Decimal)

N/A 0.1640 in

Head Size

N/A 5
Applicable to Screw Types1 N/A 1
2
3
4

Max. Head Dia. (A)

N/A 0.237 in

Min. Head Dia. (A)

N/A 0.215 in

Ref. Head Side Height (H)

N/A 0.060 in

Ref. Head Crown Height (C)

N/A 0.041 in

Ref. Total Head Height (O)

N/A 0.096 in

Ref. Head Radius (R)

N/A 0.019 in

Min. Shoulder Dia. for Type A Long Screws (E)

N/A 0.157 in

Min. Shoulder Dia. for Other Types Long Screws (E)

N/A 0.157 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
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