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Sales Systems Limited Products and Services > Fasteners > Bolts / Screws > Tapping Screws > Slotted Undercut Flat Countersunk Head Tapping Screws > Item # SUFCHTS01640XXX  
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Item # SUFCHTS01640XXX, Slotted Undercut Flat Countersunk Head Tapping Screw, with 0.312" 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.

No. 8

Nominal Size or Basic Screw Dia. (Decimal)

0.1640 in

Applicable to Screw Types1

Length for Types AB and A (L)

7/16 in

Length for Other Types (LT)

7/16 in

Max. Head Dia. (A)

0.312 in

Min. Head Dia. (A)

0.285 in

Max. Head Height (H)

0.070 in

Min. Head Height (H)

0.058 in

Max. Slot Width (J)

0.054 in

Min. Slot Width (J)

0.045 in

Max. Slot Depth (T)

0.032 in

Min. Slot Depth (T)

0.021 in

Max. Protrusion Above Gaging Dia. (F)

0.039 in

Min. Protrusion Above Gaging Dia. (F)

0.023 in

Gaging Dia. (G)

0.267 in
1 1 = Circle, 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