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Sales Systems Limited Products and Services > Fasteners > Bolts / Screws > Tapping Screws > Slotted Flat Countersunk Head Tapping Screws > Item # SFCHTS02940XXX  
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Item # SFCHTS02940XXX, Slotted Flat Countersunk Head Tapping Screw, with 0.561" Head Dia.

Applicable to screw types as indicated by code symbols.
  • Type A thread forming, except for short lengths.

Manufacturer  · Specifications  · Codes and Standards



Industrial Fasteners Institute



Tapping Screws

Unit of Measure


Nominal Size or Basic Screw Dia.

No. 18

Nominal Size or Basic Screw Dia. (Decimal)

0.2940 in

Applicable to Screw Types1

Length for Types AB and A (L)

13/16 in

Max. Head Dia. (A)

0.561 in

Min. Head Dia. (A)

0.522 in

Ref. Head Height (H)

0.180 in

Max. Slot Width (J)

0.084 in

Min. Slot Width (J)

0.072 in

Max. Slot Depth (T)

0.083 in

Min. Slot Depth (T)

0.054 in

Max. Protrusion Above Gaging Dia. (F)

0.055 in

Min. Protrusion Above Gaging Dia. (F)

0.033 in

Gaging Dia. (G)

0.505 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