- Thread Class
- 3A
- Thread Direction
- Right-hand
- Thread Length
- 0.750 inches minimum and 0.810 inches maximum
- Fastener Length
- 1.312 inches nominal
- Head Style
- Double hexagon W/hole
- Head Height
- 0.330 inches nominal
- Width Between Flats
- 0.304 inches minimum and 0.313 inches maximum
- Extended Washer Diameter
- 0.438 inches nominal
- Extended Washer Thickness
- 0.060 inches minimum and 0.070 inches maximum
- First Diameter from Head
- 0.221 inches minimum and 0.231 inches maximum
- Distance from Largest Bearing Surface of Head to End of First Diameter
- 0.502 inches minimum and 0.562 inches maximum
- Nominal Thread Diameter
- 0.250 inches
- Thread Quantity per Inch
- 28
- Hardness Rating
- 26.0 rockwell C minimum overall and 32.0 rockwell C maximum overall
- Externally Relieved Body Diameter Quantity
- 1
- Special Features
- Surface finishon threads 32 microinches; grip and bearing surface of head 63 microinches
- Material
- Steel comp 8740 overall
- Material Document and Classification
- Ams 6322 assn std single material response overall
- Surface Treatment
- Cadmium overall
- Surface Treatment Document and Classification
- Ams 2400 assn std 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.