- Thread Class
- 3A
- Thread Direction
- Right-hand
- Thread Length
- 0.345 inches minimum and 0.395 inches maximum
- Fastener Length
- 0.855 inches minimum and 0.885 inches maximum
- Head Style
- Dished hexagon
- Head Height
- 0.125 inches minimum and 0.140 inches maximum
- Width Between Flats
- 0.429 inches minimum and 0.439 inches maximum
- Locking Feature
- Patch threads
- Grip Diameter
- 0.2485 inches minimum and 0.2495 inches maximum
- Nominal Thread Diameter
- 0.250 inches
- Grip Length
- 0.490 inches minimum and 0.510 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
- Material
- Plastic polyamide locking featuresteel comp E4340 fastener or steel comp 8740 fastener
- Material Document and Classification
- MIL-S-5000 mil spec 1ST material response fastener or MIL-S-6049 mil spec 2ND material response fastener or AMS6322 assn std 2ND material response fastener
- Surface Treatment
- Cadmium fastener and chromate fastener
- Surface Treatment Document and Classification
- QQ-P-416, type 2, class 2 fed spec single treatment response fastener
- Thread Series Designator
- UNJF
- Specification/Standard Data
- 80205-NAS6206 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.