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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.
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
Specifications
Product |
N/A Tapping Screws |
Unit of Measure |
N/A English |
Type |
N/A Type IA Short Screws |
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 12 |
| Applicable to Screw Types1 |
N/A
1 3 4 |
Ref. Recess Dia. (M) |
N/A 0.264 in |
Ref. Recess Depth ((T) |
N/A 0.148 in |
Ref. Recess Width (N) |
N/A 0.056 in |
Driver Size |
N/A 3 |
Max. Recess Penetration Gaging Depth |
N/A 0.135 in |
Min. Recess Penetration Gaging Depth |
N/A 0.117 in |
Max. Protrusion Above Gaging Dia. (F) |
N/A 0.113 in |
Min. Protrusion Above Gaging Dia. (F) |
N/A 0.084 in |
Gaging Dia. (G) |
N/A 0.362 in |
- 1 1 = Circle, 2 = Diamond, 3 = Triangle, 4 = Square
