- Thread Class
- 3A
- Thread Direction
- Right-hand
- Thread Length
- 0.289 inches minimum and 0.375 inches maximum
- Fastener Length
- 0.345 inches minimum and 0.375 inches maximum
- Head Style
- Flat chamfer
- Head Diameter
- 0.262 inches minimum and 0.270 inches maximum
- Head Height
- 0.159 inches minimum and 0.164 inches maximum
- Hole Diameter
- 0.044 inches minimum and 0.050 inches maximum
- Internal Drive Style
- Hexagon
- Nominal Thread Diameter
- 0.164 inches
- Width Across Flats
- 0.141 inches minimum and 0.143 inches maximum
- Hole Quantity
- 6
- Hole Type
- Drilled
- Thread Quantity per Inch
- 36
- Hardness Rating
- 33.0 rockwell C minimum and 42.0 rockwell C maximum overall
- Hole Configuration Style
- Round internal hexagon
- Part Name Assigned BY Controlling Agency
- Bolt B056
- Material
- Iron alloy 660 overall
- Material Document and Classification
- AMS5731 assn std single material response or AMS5737 assn std single material response overall
- Surface Treatment
- Passivate overall
- Thread Series Designator
- UNRF
- Specification/Standard Data
- 80205-NAS51351 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.