screws › close tolerance screws
NAS1580C4T6
Close Tolerance Screw
Description
Flush Reduced Head Bolt
Specifications
| Countersink Angle | 99.0 degrees minimum and 101.0 degrees maximum |
|---|---|
| Country of Origin | USA |
| Fastener Length | 0.763 inches minimum and 0.793 inches maximum |
| Grip Diameter | 0.2485 inches minimum and 0.2495 inches maximum |
| Grip Length | 0.365 inches minimum and 0.385 inches maximum |
| Head Diameter | 0.464 inches minimum and 0.507 inches maximum |
| Head Style | Flat countersunk |
| Internal Drive Style | Offset cruciform (torque set) |
| Length | 25/32 |
| Material | Iron |
| Material Specification | Ams 5731 assn std single material response or ams 5732 assn std single material response or ams 5737 assn std single material response |
| Min. Tensile Strength (psi) | 160000 pounds per square inch |
| NIIN | 01-137-3945 |
| NSN | 5305-01-137-3945 |
| Specification Data | 80205-nas1580 professional/industrial association standard |
| Surface Finish | 32.0 microinches grip, 32.0 microinches threads |
| Surface Treatment | Passivate |
| Surface Treatment Specification | Qq-p-35 fed spec single treatment response |
| Thread Class | 3a |
| Thread Diameter | 0.250 |
| Thread Direction | Right-hand |
| Thread Length | 0.378 inches minimum and 0.428 inches maximum |
| Thread Qty | 28 |
| Thread Qty Per Inch (tpi) | 28 |
| Thread Series Designator | UNJF |
| Thread Size | 1/4 |
| Weight | 0.0011 lb |
Other sizes
Parts that share this base number, ordered by size. Always verify the full specification before substituting.
- NAS1580C4T3
- NAS1580C4T5
- NAS1580C4T6
- NAS1580C4T12
- NAS1580C4T12D
- NAS1580C4T32
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.
- NAS1580A4T6 NAS 1/4-28 · 25/32 in · Flat countersunk · Steel
Looking for a specific part? Use the cross-reference lookup.
Catalog data updated 2026-07-05. Report a data error