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Sales Systems Limited Products and Services > Fasteners > Bolts / Screws > Tapping Screws > Slotted Flat Countersunk Head Tapping Screws > Item # SFCHTS00990XXX  
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Item # SFCHTS00990XXX, Slotted Flat Countersunk Head Tapping Screw, with 0.187" Head Dia.

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

No. 3

Nominal Size or Basic Screw Dia. (Decimal)

0.0990 in

Applicable to Screw Types1

Length for Types AB and A (L)

7/32 in

Length for Other Types (LT)

7/32 in

Max. Head Dia. (A)

0.187 in

Min. Head Dia. (A)

0.167 in

Ref. Head Height (H)

0.059 in

Max. Slot Width (J)

0.035 in

Min. Slot Width (J)

0.027 in

Max. Slot Depth (T)

0.027 in

Min. Slot Depth (T)

0.017 in

Max. Protrusion Above Gaging Dia. (F)

0.031 in

Min. Protrusion Above Gaging Dia. (F)

0.018 in

Gaging Dia. (G)

0.148 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