- Thread Class
- 3A
- Thread Direction
- Right-hand
- Thread Length
- 0.283 inches minimum and 0.334 inches maximum
- Fastener Length
- 1.981 inches minimum and 2.001 inches maximum
- Head Style
- Dished hexagon
- Head Height
- 0.126 inches minimum and 0.141 inches maximum
- Width Between Flats
- 0.430 inches minimum and 0.439 inches maximum
- Grip Diameter
- 0.2483 inches minimum and 0.2492 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
- 1.562 inches minimum and 1.578 inches maximum
- Thread Quantity per Inch
- 28
- Hardness Rating
- 36.0 rockwell C minimum and 43.0 rockwell C maximum overall
- Distance from Head Largest Bearing Surface to Shank Hole Center
- 1.881 inches minimum and 1.911 inches maximum first hole
- Surface Finish
- 63.0 microinches bearing surface of head
- Surface Finish
- 63.0 microinches grip
- Special Features
- Retaining element in shank
- Material
- Steel comp E4340 or steel comp 4340 or steel comp 8740 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
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.