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NAS428-4A16
1.750 Inch Length NAS428 Crowned Hexagon Head Bolt
Description
Fastener Length: 1-3/4", Thread: 1/4-28, Thread Length: 1-23/32
Specifications
| Country of Origin | USA |
|---|---|
| Fastener Length | 1.750 |
| Features Provided | Finished head |
| Grip Length | Between 0.031 inches and 0.062 inches |
| Hardness Rating | 26.0 rockwell c and 32.0 rockwell c |
| Head Height | 0.141 |
| Head Style | Crowned hexagon |
| Head Type | Hexagon |
| Industry Standards/Certification | NAS428 |
| Length | 1 3/4, 1.750 in |
| Material | Steel |
| Material Specification | Mil-b-6812 military specification all material responses |
| Min. Tensile Strength (psi) | 125000 pounds per square inch |
| Surface Treatment | Cadmium and chromate |
| Surface Treatment Specification | Qq-p-416 type 2 cl 3 federal specification all treatment responses |
| Thread Class | 3a |
| Thread Diameter | 0.250 |
| Thread Direction | Right-hand |
| Thread Length | Between 1.688 inches and 1.719 inches |
| Thread Qty | 28 |
| Thread Qty Per Inch (tpi) | 28 |
| Thread Series | UNF |
| Thread Series Designator | Unf (fine thread) |
| Thread Size | 0.2500-28, 1/4 |
| Weight | .005 lb |
| Width Between Flats | 0.438 |
Other sizes
Parts that share this base number, ordered by size. Always verify the full specification before substituting.
Cross-reference
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Catalog data updated 2026-07-05. Report a data error