- Thread Class
- 3A
- Thread Direction
- Right-hand
- Thread Length
- 3.259 inches minimum and 3.407 inches maximum
- Fastener Length
- 3.390 inches minimum and 3.437 inches maximum
- Head Style
- Hexagon
- Head Height
- 0.209 inches minimum and 0.229 inches maximum
- Width Between Flats
- 0.428 inches minimum and 0.440 inches maximum
- Hole Diameter
- 0.070 inches minimum and 0.080 inches maximum
- Nominal Thread Diameter
- 0.250 inches
- Grip Length
- 0.030 inches minimum and 0.060 inches maximum
- Hole Quantity
- 3
- Hole Type
- Drilled
- Features Provided
- Finished head
- Thread Quantity per Inch
- 28
- Hardness Rating
- 36.0 rockwell C minimum overall and 40.0 rockwell C maximum overall
- Hole Configuration Style
- Hexagon corners
- Material
- Steel comp 4140 overall or steel comp 8740 overall or steel comp 8630 overall or steel comp 8735 overall or steel comp 4130 overall or steel comp 4037 overall
- Surface Treatment
- Cadmium overall and chromate overall
- Surface Treatment Document and Classification
- QQ-P-416, ty 2 cl 2 fed spec single treatment response overall
- Thread Series Designator
- UNJF
- Specification/Standard Data
- 80205-NAS564 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.