bolts › close tolerance bolts
NAS1581C5T6
Bolt
Description
Fastener Length: 57/64", Thread: 1/4-24, Thread Length: 33/64"
Specifications
| Countersink Angle | 100.0 degrees |
|---|---|
| Fastener Length | 0.861 inches minimum and 0.891 inches maximum |
| Grip Diameter | 0.3110 inches minimum and 0.3120 inches maximum |
| Grip Length | 0.365 inches minimum and 0.385 inches maximum |
| Head Diameter | 0.429 inches minimum and 0.479 inches maximum |
| Head Style | Flat countersunk |
| Internal Drive Style | Offset cruciform (torque set) |
| Length | 57/64 |
| Material | Iron |
| Min. Tensile Strength (psi) | 160000 pounds per square inch |
| Specification Data | 80205-nas1581 professional/industrial association standard |
| Surface Finish | 32.0 microinches grip, 32.0 microinches threads |
| Surface Treatment | Passivate |
| Thread Class | 3a |
| Thread Diameter | 0.312 |
| Thread Direction | Right-hand |
| Thread Length | 0.476 inches minimum and 0.526 inches maximum |
| Thread Qty | 24 |
| Thread Qty Per Inch (tpi) | 24 |
| Thread Series Designator | UNJF |
| Thread Size | 1/4 |
Other sizes
Parts that share this base number, ordered by size. Always verify the full specification before substituting.
- NAS1581C5T5
- NAS1581C5T6
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.
- NAS1581F5R6 NAS 1/4-24 · 7/8 in · Flat countersunk · Steel
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Catalog data updated 2026-07-05. Report a data error