- Thread Class
- 3A
- Thread Direction
- Right-hand
- Thread Length
- 0.250 inches minimum
- Fastener Length
- 1.390 inches minimum and 1.437 inches maximum
- Head Style
- Flat countersunk
- Head Diameter
- 0.501 inches minimum and 0.506 inches maximum
- Grip Diameter
- 0.2485 inches minimum and 0.2495 inches maximum
- Shank Unthreaded Hole Diameter
- 0.076 inches nominal first hole
- Internal Drive Style
- High-torque
- Nominal Thread Diameter
- 0.250 inches
- Grip Length
- 0.928 inches minimum and 0.948 inches maximum
- Thread Quantity per Inch
- 28
- Countersink Angle
- 100.0 degrees nominal
- Distance from Head Largest Bearing Surface to Shank Hole Center
- 0.140 inches minimum first hole and 0.187 inches maximum first hole
- Surface Finish
- 32.0 microinches grip
- Surface Finish
- 32.0 microinches threads
- Material
- Iron alloy 660 overall
- Material Document and Classification
- Ams 5731 assn std single material response overall
- Surface Treatment
- Cadmium overall and chromate overall
- Surface Treatment Document and Classification
- QQ-P-416 type 2 class 3 fed spec all treatment responses overall
- Thread Series Designator
- UNF
Catalogue data is compiled from public DLA/FLIS sources and is provided for
identification. Availability, condition and certification are confirmed on
quotation. OmniSynk Distribution Services is a stocking distributor.