- Thread Class
- 3A
- Thread Direction
- Right-hand
- Thread Length
- 0.437 inches minimum and 0.516 inches maximum
- Fastener Length
- 3.390 inches minimum and 3.437 inches maximum
- Head Style
- Hexagon
- Head Height
- 0.140 inches minimum and 0.172 inches maximum
- Width Between Flats
- 0.428 inches minimum and 0.440 inches maximum
- Grip Diameter
- 0.2487 inches minimum and 0.2492 inches maximum
- Shank Unthreaded Hole Diameter
- 0.076 inches nominal first hole
- Nominal Thread Diameter
- 0.250 inches
- Grip Length
- 2.921 inches minimum and 2.953 inches maximum
- Thread Quantity per Inch
- 28
- Minimum Tensile Strength
- 125000 pounds per square inch
- Hardness Rating
- 26.0 rockwell C minimum and 32.0 rockwell C maximum overall
- Distance from Head Largest Bearing Surface to Shank Hole Center
- 3.233 inches minimum first hole and 3.265 inches maximum first hole
- Surface Finish
- 63.0 microinches grip
- Material
- Steel comp 8740 or steel comp 8630 or steel comp 8735 or steel comp 4037 or steel comp 4140 or steel comp 4130 overall
- Material Document and Classification
- MIL-S-6049 mil spec 1ST material response or MIL-S-6050 mil spec 2ND material response or MIL-S-6098 mil spec 3RD material response or ams 6300 assn std 4TH material response or MIL-S-5626 mil spec 5TH material response or MIL-S-6758 mil spec 6TH material response overall
- Surface Treatment
- Cadmium and chromate overall
- Surface Treatment Document and Classification
- QQ-P-416 type 2 class 3 fed spec all treatment responses 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.