Applicable to screw types as indicated by code symbols.
  • Type AB thread forming.
  • 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. 3

Nominal Size or Basic Screw Dia. (Decimal)

N/A 0.0990 in
Applicable to Screw Types1 N/A 1
3
4

Length for Types AB and A (L)

N/A 7/32 in

Length for Other Types (LT)

N/A 7/32 in

Max. Head Dia. (A)

N/A 0.187 in

Min. Head Dia. (A)

N/A 0.167 in

Ref. Head Side Height (H)

N/A 0.042 in

Ref. Head Crown Height (C)

N/A 0.033 in

Max. Total Head Height (O)

N/A 0.075 in

Min. Total Head Height (O)

N/A 0.059 in

Max. Slot Width (J)

N/A 0.035 in

Min. Slot Width (J)

N/A 0.027 in

Max. Slot Depth (T)

N/A 0.047 in

Min. Slot Depth (T)

N/A 0.038 in

Max. Protrusion Above Gaging Dia. (F)

N/A 0.064 in

Min. Protrusion Above Gaging Dia. (F)

N/A 0.044 in

Gaging Dia. (G)

N/A 0.148 in

Codes and Standards

Codes and Standards

N/A Abstract of ASME B18.6.4 1998
  • 1 1 = Circle, 3 = Triangle, 4 = Square
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