- Thread Class
- 3A
- Thread Direction
- Right-hand
- Thread Length
- 0.400 inches minimum and 0.450 inches maximum
- Fastener Length
- 0.535 inches minimum and 0.565 inches maximum
- Head Style
- Dished hexagon
- Head Height
- 0.125 inches minimum and 0.135 inches maximum
- Width Between Flats
- 0.430 inches minimum and 0.439 inches maximum
- Grip Diameter
- 0.2485 inches minimum and 0.2495 inches maximum
- Shank Unthreaded Hole Diameter
- 0.076 inches minimum and 0.086 inches maximum first hole
- Nominal Thread Diameter
- 0.250 inches
- Grip Length
- 0.115 inches minimum and 0.135 inches maximum
- Thread Quantity per Inch
- 28
- Minimum Tensile Strength
- 160000 pounds per square inch
- Hardness Rating
- 36.0 rockwell C minimum and 40.0 rockwell C maximum overall
- Distance from Head Largest Bearing Surface to Shank Hole Center
- 0.347 inches minimum and 0.397 inches maximum first hole
- Surface Finish
- 32.0 microinches threads
- Surface Finish
- 63.0 microinches bearing surface of head
- Surface Finish
- 63.0 microinches grip
- Material
- Steel comp E4340 or steel comp 4140 or steel comp 8740 or steel comp 8735 or steel comp 6150 overall
- Surface Treatment
- Cadmium 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-NAS6604 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.