- Thread Class
- 3A
- Thread Direction
- Right-hand
- Thread Length
- 4.688 inches minimum and 4.781 inches maximum
- Fastener Length
- 4.750 inches minimum and 4.812 inches maximum
- Head Style
- Crowned hexagon
- Head Height
- 0.141 inches nominal
- Width Between Flats
- 0.428 inches minimum and 0.440 inches maximum
- Nominal Thread Diameter
- 0.250 inches
- Grip Length
- 0.031 inches minimum and 0.062 inches maximum
- Features Provided
- Finished head
- Thread Quantity per Inch
- 28
- Minimum Tensile Strength
- 125000 pounds per square inch
- Hardness Rating
- 26.0 rockwell C minimum overall and 32.0 rockwell C maximum overall
- Material
- Steel comp 4140 overall
- Material Document and Classification
- MIL-S-5626 mil spec single material response overall
- Surface Treatment
- Cadmium overall
- Thread Series Designator
- UNF
- Specification/Standard Data
- 80205-NAS428 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.