- Thread Class
- 3A
- Thread Direction
- Right-hand
- Thread Length
- 0.721 inches minimum
- Fastener Length
- 1.491 inches nominal
- Head Style
- Double hexagon W/hole
- Head Height
- 0.435 inches nominal
- Width Between Flats
- 0.492 inches minimum and 0.502 inches maximum
- Extended Washer Diameter
- 0.740 inches minimum and 0.750 inches maximum
- Extended Washer Thickness
- 0.099 inches nominal
- Grip Diameter
- 0.4360 inches minimum and 0.4370 inches maximum
- Nominal Thread Diameter
- 0.438 inches
- Grip Length
- 0.750 inches nominal
- Thread Quantity per Inch
- 20
- Minimum Tensile Strength
- 180000 pounds per square inch
- Hardness Rating
- 39.0 rockwell C minimum overall and 43.0 rockwell C maximum overall
- Material
- Steel comp E4340 overall or steel comp 8740 overall or steel comp 6150 overall or steel comp 4140 overall
- Material Document and Classification
- MIL-S-5000 mil spec 1ST material response overall or MIL-S-6049 mil spec 2ND material response overall or MIL-S-8503 mil spec 3RD material response overall or MIL-S-5626 mil spec 4TH material response overall
- Surface Treatment
- Cadmium overall and chromate overall
- Surface Treatment Document and Classification
- QQ-B-416 TY2, class 3 fed spec single treatment response overall
- Thread Series Designator
- UNF
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.