screws › close tolerance screws
NAS1581F3T8
Close Tolerance Screw
Description
Flush Reduced Head Bolt
Specifications
| Alternate Part Number | NAS1581A3T8 |
|---|---|
| Countersink Angle | 99.0 degrees minimum and 101.0 degrees maximum |
| Country of Origin | USA |
| Fastener Length | 0.848 inches minimum and 0.878 inches maximum |
| Finish | Cadmium Per Ams QQ-P-416 TYPE II |
| Grip | 0.500 |
| Grip Diameter | 0.1890 inches minimum and 0.1895 inches maximum |
| Grip Length | 0.490 inches minimum and 0.510 inches maximum |
| Head Diameter | 0.2578 inches minimum and 0.3047 inches maximum |
| Head Style | Flat countersunk |
| Heat Treat | 160,000 - 180,000 PSI |
| Internal Drive Style | High-torque |
| Length | 0.863, 7/8 |
| Material | Steel |
| Material Specification | Mil-s-5626 mil spec single material response or mil-s-5000 mil spec single material response |
| NIIN | 01-477-2865 |
| NSN | 5305-01-477-2865 |
| Surface Treatment | Passivate |
| Surface Treatment Specification | Qq-p-35 fed spec single treatment response |
| Thread Class | 3a |
| Thread Diameter | 0.188 |
| Thread Direction | Right-hand |
| Thread Length | 0.363 |
| Thread Qty | 32 |
| Thread Qty Per Inch (tpi) | 32 |
| Thread Series Designator | UNJF |
| Thread Size | 10 |
| Weight | 0.0064 lb |
Other sizes
Parts that share this base number, ordered by size. Always verify the full specification before substituting.
Cross-reference
Interchangeable
Parts that share a National Stock Number or are listed as an alternate for NAS1581F3T8 — functionally equivalent.
- NAS1581A3T8 Listed alternate 7/8 in · Flat countersunk · Steel
Similar parts
Parts with matching key dimensions — often from a different standards family. Candidates for comparison only; verify the full specification before substituting.
- NAS1581F3R8 NAS #10-32 · 7/8 in · Flat countersunk · Steel
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Catalog data updated 2026-07-05. Report a data error