bolts › close tolerance bolts
NAS1581A3T4
Close Tolerance Bolt
Description
Close Tolerance Bolt
Specifications
| Countersink Angle | 100.0 degrees |
|---|---|
| Fastener Length | Between 0.598 inches and 0.628 inches |
| Grip Diameter | Between 0.1885 inches and 0.1895 inches |
| Grip Length | Between 0.240 inches and 0.260 inches |
| Hardness Rating | 36.0 rockwell c and 40.0 rockwell c |
| Head Diameter | Between 0.258 inches and 0.305 inches |
| Head Style | Flat countersunk |
| Internal Drive Style | Offset cruciform (torque set) |
| Material | Steel |
| 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 | Cadmium and chromate |
| Surface Treatment Specification | Qq-p-416 ty2 cl2 federal specification single treatment response |
| Thread Class | 3a |
| Thread Diameter | 0.190 |
| Thread Direction | Right-hand |
| Thread Length | Between 0.338 inches and 0.388 inches |
| Thread Qty | 32 |
| Thread Qty Per Inch (tpi) | 32 |
| Thread Series | UNJF |
| Thread Series Designator | Unjf (fine thread with external controlled root radius) |
Other sizes
Parts that share this base number, ordered by size. Always verify the full specification before substituting.
- NAS1581A3T4
- NAS1581A3T9
Cross-reference
Interchangeable
Parts that share a National Stock Number or are listed as an alternate for NAS1581A3T4 — functionally equivalent.
- NAS1581F3T4 Listed alternate #10-32 · 5/8 in · Flat countersunk · Steel
Looking for a specific part? Use the cross-reference lookup.
Catalog data updated 2026-07-05. Report a data error