- Thread Class
- 3A
- Thread Direction
- Right-hand
- Thread Length
- 0.188 inches maximum
- Fastener Length
- 0.188 inches nominal
- Head Style
- Headless (setscrew)
- Locking Feature
- Pellet threads or strip threads
- Point Style
- CUP
- Internal Drive Style
- Hexagon
- Nominal Thread Diameter
- 0.250 inches
- Width Across Flats
- 0.125 inches minimum and 0.127 inches maximum
- Thread Quantity per Inch
- 28
- Hardness Rating
- 33.0 rockwell C minimum overall and 40.0 rockwell C maximum overall
- Material
- Steel comp 4037 overall or steel comp 4137 overall or steel comp 4140 overall or steel comp 8630 overall or steel comp 8740 overall
- Material Document and Classification
- 66 fed std all material responses overall
- Surface Treatment
- Cadmium overall and chromate overall
- Surface Treatment Document and Classification
- QQ-P-416, type 2, class 3 fed spec single treatment response 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.