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Sales Systems Limited Products and Services > Fasteners > Bolts / Screws > Tapping Screws > Slotted Flat Countersunk Head Tapping Screws > Item # SFCHTS02500XXX  
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Item # SFCHTS02500XXX, Slotted Flat Countersunk Head Tapping Screw, with 0.477" 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.

1/4 in

Nominal Size or Basic Screw Dia. (Decimal)

0.2500 in

Applicable to Screw Types1

Length for Types AB and A (L)

5/8 in

Length for Other Types (LT)

5/8 in

Max. Head Dia. (A)

0.477 in

Min. Head Dia. (A)

0.442 in

Ref. Head Height (H)

0.153 in

Max. Slot Width (J)

0.075 in

Min. Slot Width (J)

0.064 in

Max. Slot Depth (T)

0.070 in

Min. Slot Depth (T)

0.046 in

Max. Protrusion Above Gaging Dia. (F)

0.050 in

Min. Protrusion Above Gaging Dia. (F)

0.029 in

Gaging Dia. (G)

0.424 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