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Sales Systems Limited Products and Services > Fasteners > Bolts / Screws > Tapping Screws > Hex Washer Head Tapping Screws > Item # HWHTS03125XXX  
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Item # HWHTS03125XXX, Hex Washer Head Tapping Screw, with 0.3125" Nominal Dia.

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.

Manufacturer  · Specifications  · Codes and Standards



Industrial Fasteners Institute



Tapping Screws

Unit of Measure


Nominal Size or Basic Screw Dia.

5/16 in

Nominal Size or Basic Screw Dia. (Decimal)

0.3125 in

Applicable to Screw Types1

Max. Width Across Flats (A)

0.500 in

Min. Width Across Flats (A)

0.489 in

Min. Width Across Corners (W)

0.545 in

Max. Head Height (H)

0.230 in

Min. Head Height (H)

0.208 in

Max. Washer Dia. (B)

0.676 in

Min. Washer Dia. (B)

0.624 in

Max. Washer Thickness (U)

0.055 in

Min. Washer Thickness (U)

0.035 in

Min. Protrusion Beyond Gaging Ring (F)

0.125 in
1 1 = Circle, 2 = Diamond, 3 = Triangle, 4 = Square

Codes and Standards

Codes and Standards

Abstract of ASME B18.6.4 1998


Type Designations for Tapping Screws and Metallic Drive Screws
(PDF, 206KB)

Distributor of Industry Standard and Military Specification Threaded Fasteners