- Thread Class
- 3A
- Thread Direction
- Right-hand
- Thread Length
- 0.443 inches minimum and 0.510 inches maximum
- Fastener Length
- 1.265 inches minimum and 1.312 inches maximum
- Head Style
- Flat countersunk
- Head Diameter
- 0.497 inches minimum and 0.507 inches maximum
- Grip Diameter
- 0.2483 inches minimum and 0.2492 inches maximum
- Shank Unthreaded Hole Diameter
- 0.076 inches nominal first hole
- Single Shear Strength
- 4650 pounds per square inch
- Internal Drive Style
- Hexagon
- Nominal Thread Diameter
- 0.250 inches
- Grip Length
- 0.802 inches minimum and 0.822 inches maximum
- Width Across Flats
- 0.157 inches minimum and 0.159 inches maximum
- Thread Quantity per Inch
- 28
- Minimum Tensile Strength
- 160000 pounds per square inch
- Hardness Rating
- 36.0 rockwell C minimum overall and 40.0 rockwell C maximum overall
- Countersink Angle
- 100.0 degrees nominal
- Distance from Head Largest Bearing Surface to Shank Hole Center
- 1.124 inches nominal first hole
- Surface Finish
- 32.0 microinches grip
- Material
- Steel comp 4130 overall or steel comp 8630 overall or steel comp 8735 overall or steel comp 8740 overall
- Surface Treatment
- Cadmium overall and chromate overall
- Surface Treatment Document and Classification
- QQ-P-416, type 2, class 2 fed spec single treatment response overall
- Thread Series Designator
- UNJF
- Specification/Standard Data
- 80205-NAS334 professional/industrial association standard
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.