- Thread Class
- 3A
- Thread Direction
- Right-hand
- Thread Length
- 0.378 inches minimum and 0.428 inches maximum
- Fastener Length
- 1.326 inches minimum and 1.356 inches maximum
- Head Style
- Flat countersunk
- Head Diameter
- 0.350 inches minimum and 0.399 inches maximum
- Grip Diameter
- 0.2485 inches minimum and 0.2495 inches maximum
- Internal Drive Style
- Cross recess type 1
- Nominal Thread Diameter
- 0.250 inches
- Grip Length
- 0.928 inches minimum and 0.948 inches maximum
- Thread Quantity per Inch
- 28
- Minimum Tensile Strength
- 220000 pounds per square inch
- Hardness Rating
- 46.0 rockwell C minimum overall and 49.0 rockwell C maximum overall
- Countersink Angle
- 99.0 degrees minimum and 101.0 degrees maximum
- Material
- Steel comp H11 overall
- Material Document and Classification
- Ams 6487 assn std single material response overall
- Surface Treatment
- Cadmium overall
- Surface Treatment Document and Classification
- Nas 672 assn std 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.