bolts › close tolerance bolts
NAS1580C4T18
Close Tolerance Bolt
Description
Fastener Length: 1-17/32", Thread: 1/4-28, Thread Length: 27/64"
Specifications
| Countersink Angle | Between 99.0 degrees and 101.0 degrees |
|---|---|
| Fastener Length | Between 1.513 inches and 1.543 inches |
| Grip Diameter | Between 0.2485 inches and 0.2495 inches |
| Grip Length | Between 1.115 inches and 1.135 inches |
| Head Diameter | Between 0.464 inches and 0.506 inches |
| Head Style | Flat countersunk |
| Internal Drive Style | Offset cruciform (torque set) |
| Material | Iron |
| Material Specification | Ams5731 assn standard single material response or ams5732 assn standard single material response or ams5737 assn standard single material response |
| Min. Tensile Strength (psi) | 160000 pounds per square inch |
| Specification Data | 80205-1580 professional/industrial association standard |
| Surface Finish | 32.0 microinches grip, 32.0 microinches threads |
| Surface Treatment | Passivate |
| Surface Treatment Specification | Qq-p-35 federal specification single treatment response |
| Thread Class | 3a |
| Thread Diameter | 0.250 |
| Thread Direction | Right-hand |
| Thread Length | Between 0.378 inches and 0.428 inches |
| Thread Qty | 28 |
| Thread Qty Per Inch (tpi) | 28 |
| Thread Series | UNJF |
| Thread Series Designator | Unjf (fine thread with external controlled root radius) |
| Thread Size | 1/4 |
Other sizes
Parts that share this base number, ordered by size. Always verify the full specification before substituting.
Cross-reference
No interchangeable or dimensionally similar parts are on record for NAS1580C4T18. Try the cross-reference lookup to search by a different part number.
Catalog data updated 2026-07-05. Report a data error