- Thread Class
- 3A
- Thread Direction
- Right-hand
- Thread Length
- 0.332 inches minimum and 0.403 inches maximum
- Fastener Length
- 0.826 inches minimum and 0.856 inches maximum
- Head Style
- Flat countersunk
- Head Diameter
- 0.350 inches minimum and 0.399 inches maximum
- Shoulder Diameter
- 0.2637 inches minimum first shoulder and 0.2643 inches maximum first shoulder
- Shoulder Length
- 0.428 inches minimum first shoulder and 0.448 inches maximum first shoulder
- Internal Drive Style
- Offset cruciform (torque set)
- Nominal Thread Diameter
- 0.250 inches
- Thread Quantity per Inch
- 28
- Minimum Tensile Strength
- 220000 pounds per square inch
- Hardness Rating
- 46.0 rockwell C minimum overall and 50.0 rockwell C maximum overall
- Minimum Yield Strength
- 132000 pounds per square inch
- Countersink Angle
- 99.0 degrees nominal and 101.0 degrees maximum
- Shoulder Shape
- Round first shoulder
- 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.