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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 1/4 in |
Nominal Size or Basic Screw Dia. (Decimal) |
N/A 0.2500 in |
Head Size |
N/A 10 |
| Applicable to Screw Types1 |
N/A
1 3 4 |
Ref. Recess Dia. (M) |
N/A 0.202 in |
Ref. Recess Depth ((T) |
N/A 0.132 in |
Ref. Recess Width (N) |
N/A 0.041 in |
Driver Size |
N/A 2 |
Max. Recess Penetration Gaging Depth |
N/A 0.125 in |
Min. Recess Penetration Gaging Depth |
N/A 0.107 in |
Max. Protrusion Above Gaging Dia. (F) |
N/A 0.102 in |
Min. Protrusion Above Gaging Dia. (F) |
N/A 0.075 in |
Gaging Dia. (G) |
N/A 0.313 in |
- 1 1 = Circle, 2 = Diamond, 3 = Triangle, 4 = Square
