bolts › machine bolts
NAS428K4A12
Machine Bolt
Description
Fastener Length: 1-1/4", Thread: 1/4-28, Thread Length: 1-7/32", NAS428 series bolt
Specifications
| Fastener Length | 1.250 |
|---|---|
| Features Provided | Finished head |
| Grip Length | 0.031 inches minimum and 0.062 inches maximum |
| Hardness Rating | 26.0 rockwell c minimum and 32.0 rockwell c maximum |
| Head Height | 0.141 |
| Head Style | Crowned hexagon |
| Length | 1 1/4 |
| Material | Steel |
| Material Specification | Mil-b-6812 mil spec all material responses |
| Min. Tensile Strength (psi) | 125000 pounds per square inch |
| Special Features | As modified by slotted shank |
| Surface Treatment | Cadmium and chromate |
| Surface Treatment Specification | Qq-p-416 fed spec all treatment responses |
| Thread Class | 3a |
| Thread Diameter | 0.250 |
| Thread Direction | Right-hand |
| Thread Length | 1.188 inches minimum and 1.219 inches maximum |
| Thread Qty | 28 |
| Thread Qty Per Inch (tpi) | 28 |
| Thread Series Designator | UNF |
| Thread Size | 1/4 |
| Width Between Flats | 0.438 |
Other sizes
Parts that share this base number, ordered by size. Always verify the full specification before substituting.
- NAS428K4A6
- NAS428K4A7
- NAS428K4A10
- NAS428K4A11
- NAS428K4A12
Cross-reference
No interchangeable or dimensionally similar parts are on record for NAS428K4A12. Try the cross-reference lookup to search by a different part number.
Catalog data updated 2026-07-05. Report a data error