- Thread Class
- 3A
- Thread Direction
- Right-hand
- Thread Length
- 0.899 inches minimum and 1.000 inches maximum
- Fastener Length
- 0.970 inches minimum and 1.000 inches maximum
- Head Style
- Flat chamfer
- Head Diameter
- 0.365 inches minimum and 0.375 inches maximum
- Head Height
- 0.244 inches minimum and 0.250 inches maximum
- Locking Feature
- Strip threads
- Internal Drive Style
- Hexagon
- Nominal Thread Diameter
- 0.250 inches
- Width Across Flats
- 0.188 inches minimum and 0.190 inches maximum
- Thread Quantity per Inch
- 28
- Minimum Tensile Strength
- 80000 pounds per square inch
- Hardness Rating
- 80.0 rockwell B minimum overall
- Minimum Yield Strength
- 30000 pounds per square inch
- Material
- Steel comp 302 overall or steel comp 304 overall or steel comp 305 overall or steel comp 316 overall or steel comp 384 overall or steel comp XM-7 overall
- Material Document and Classification
- 66 fed std 1ST material response overall or 66 fed std 2ND material response overall or 66 fed std 3RD material response overall or 66 fed std 4TH material response overall or 66 fed std 5TH material response overall or astm A493 assn std 6TH material response overall
- Surface Treatment
- Cadmium overall
- Surface Treatment Document and Classification
- QQ-P-416, ty 1, cl 2 fed spec single treatment response overall
- Thread Series Designator
- UNRF
- Specification/Standard Data
- 80205-NAS 1351 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.