Item # item-3065, Type IA Long Screw, with 0.284" Recess Dia. On Sales Systems Ltd.

This type of recess has a large center opening, wide straight wings, and blunt bottom, with all edges relieved or rounded.

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.

Unit of Measure

Manufacturer | Specifications | Codes and Standards

Manufacturer

N/A Industrial Fasteners Institute

Specifications

Product	N/A Tapping Screws
Unit of Measure	N/A English
Type	N/A Type IA Long Screws with Shoulder
Nominal Size or Basic Screw Dia.	N/A 5/16 in
Nominal Size or Basic Screw Dia. (Decimal)	N/A 0.3125 in
Head Size	N/A 1/4 in
Applicable to Screw Types¹	N/A 1 3 4
Ref. Recess Dia. (M)	N/A 0.284 in
Ref. Recess Depth ((T)	N/A 0.168 in
Ref. Recess Width (N)	N/A 0.057 in
Driver Size	N/A 3
Max. Recess Penetration Gaging Depth	N/A 0.155 in
Min. Recess Penetration Gaging Depth	N/A 0.137 in
Max. Protrusion Above Gaging Dia. (F)	N/A 0.129 in
Min. Protrusion Above Gaging Dia. (F)	N/A 0.095 in
Gaging Dia. (G)	N/A 0.424 in

Codes and Standards

N/A Abstract of ASME B18.6.4 1998

¹ 1 = Circle, 2 = Diamond, 3 = Triangle, 4 = Square

Manufacturer

Manufacturer

Specifications

Product

Unit of Measure

Type

Nominal Size or Basic Screw Dia.

Nominal Size or Basic Screw Dia. (Decimal)

Head Size

Ref. Recess Dia. (M)

Ref. Recess Depth ((T)

Ref. Recess Width (N)

Driver Size

Max. Recess Penetration Gaging Depth

Min. Recess Penetration Gaging Depth

Max. Protrusion Above Gaging Dia. (F)

Min. Protrusion Above Gaging Dia. (F)

Gaging Dia. (G)

Codes and Standards

Codes and Standards