bolts › close tolerance bolts
NAS1204-26D
Bolt
Description
Fastener Length: 1-61/64", Thread: 1/4-28, Thread Length: 21/64"
Specifications
| Countersink Angle | 100.0 degrees |
|---|---|
| Distance From Head Largest Bearing Surface To Shank Hole Center | 1.825 inches nominal first hole |
| Fastener Length | 1.926 inches minimum and 1.956 inches maximum |
| Grip Diameter | 0.2485 inches minimum and 0.2495 inches maximum |
| Grip Length | 1.615 inches minimum and 1.635 inches maximum |
| Hardness Rating | 36.0 rockwell c minimum and 40.0 rockwell c maximum |
| Head Diameter | 0.449 inches minimum and 0.507 inches maximum |
| Head Style | Flat countersunk |
| Internal Drive Style | Cross recess type 1 |
| Length | 1 61/64 |
| Material | Steel |
| Min. Tensile Strength (psi) | 160000 pounds per square inch |
| Shank Unthreaded Hole Diameter | 0.076 inches nominal first hole |
| Specification Data | 80205-nas1204 professional/industrial association standard |
| Surface Treatment | Cadmium and chromate |
| Surface Treatment Specification | Qq-p-416 ty 2 cl 2 fed spec single treatment response |
| Thread Class | 3a |
| Thread Diameter | 0.250 |
| Thread Direction | Right-hand |
| Thread Length | 0.291 inches minimum and 0.341 inches maximum |
| Thread Qty | 28 |
| Thread Qty Per Inch (tpi) | 28 |
| Thread Series Designator | UNJF |
| Thread Size | 1/4 |
Cross-reference
Similar parts
Parts with matching key dimensions — often from a different standards family. Candidates for comparison only; verify the full specification before substituting.
- NAS1154V26 NAS 1/4-28 · 0.073 in · Flat countersunk · Titanium
Looking for a specific part? Use the cross-reference lookup.
Catalog data updated 2026-07-05. Report a data error