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Sales Systems Limited Products and Services > Fasteners > Bolts / Screws > Tapping Screws > Slotted Flat Countersunk Head Tapping Screws > Item # SFCHTS03125XXX  
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Item # SFCHTS03125XXX, Slotted Flat Countersunk Head Tapping Screw, with 0.597" Head 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

Length for Types AB and A (L)

13/16 in

Length for Other Types (LT)

5/8 in

Max. Head Dia. (A)

0.597 in

Min. Head Dia. (A)

0.556 in

Ref. Head Height (H)

0.191 in

Max. Slot Width (J)

0.084 in

Min. Slot Width (J)

0.072 in

Max. Slot Depth (T)

0.088 in

Min. Slot Depth (T)

0.058 in

Max. Protrusion Above Gaging Dia. (F)

0.057 in

Min. Protrusion Above Gaging Dia. (F)

0.034 in

Gaging Dia. (G)

0.539 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)

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