- Thread Class
- 3A
- Thread Direction
- Right-hand
- Thread Length
- 0.425 inches nominal
- Fastener Length
- 3.097 inches minimum and 3.125 inches maximum
- Head Style
- Dished hexagon
- Head Height
- 0.125 inches minimum and 0.140 inches maximum
- Width Between Flats
- 0.429 inches minimum and 0.439 inches maximum
- Grip Diameter
- 0.248 inches minimum and 0.250 inches maximum
- Shank Unthreaded Hole Diameter
- 0.076 inches minimum first hole and 0.086 inches maximum first hole
- End Item Identification
- Acft, C-133
- Nominal Thread Diameter
- 0.250 inches
- Grip Length
- 2.678 inches minimum and 2.698 inches maximum
- Features Provided
- Finished head
- Thread Quantity per Inch
- 28
- Hardness Rating
- 36.0 rockwell C minimum overall and 40.0 rockwell C maximum overall
- Distance from Head Largest Bearing Surface to Shank Hole Center
- 2.924 inches minimum first hole and 2.944 inches maximum first hole
- Surface Finish
- 125.0 microinches first hole
- Surface Finish
- 125.0 microinches grip
- Surface Finish
- 125.0 microinches sides of head
- Surface Finish
- 125.0 microinches top of head
- Surface Finish
- 32.0 microinches bearing surface of head
- Surface Finish
- 32.0 microinches threads
- Material
- Steel comp 4340 overall or steel comp 8740 overall
- Material Document and Classification
- MIL-S-5000, G43400 mil spec 1ST material response overall or MIL-S-6049 mil spec 2ND material response overall or ams 6322, G87400 assn std 2ND material response overall
- Surface Treatment
- Cadmium overall and chromate overall
- Surface Treatment Document and Classification
- QQ-P-416, type 2, class 2 fed spec all treatment responses overall
- Supplementary Features
- Intmd lg SPEC/-42 P 0.062 in./
- Thread Series Designator
- UNJF
- Specification/Standard Data
- 80205-NAS6604 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.