- Thread Class
- 3A
- Thread Direction
- Right-hand
- Thread Length
- 0.323 inches minimum
- Fastener Length
- 0.484 inches minimum and 0.516 inches maximum
- Head Style
- Flat countersunk
- Head Diameter
- 0.480 inches minimum and 0.531 inches maximum
- Internal Drive Style
- Hexagon
- Nominal Thread Diameter
- 0.250 inches
- Width Across Flats
- 0.156 inches minimum and 0.158 inches maximum
- Thread Quantity per Inch
- 28
- Minimum Tensile Strength
- 160000 pounds per square inch
- Hardness Rating
- 36.0 rockwell C minimum and 43.0 rockwell C maximum overall
- Minimum Yield Strength
- 130000 pounds per square inch
- Countersink Angle
- 80.0 degrees minimum and 84.0 degrees maximum
- Material
- Steel overall
- Material Document and Classification
- 66 fed std single material response overall
- Surface Treatment
- Cadmium and chromate overall
- Surface Treatment Document and Classification
- QQ-P-416 ty 2 cl 3 fed spec single treatment response overall
- Thread Series Designator
- UNF
- Nondefinitive Spec/STD Data
- 4 type
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.