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NAS1581F3R8
Close Tolerance Screw
Description
Flush Reduced Head Bolt
Specifications
| Alternate Part Number | NAS1581A3R8 |
|---|---|
| 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 |
| Grip Diameter | 0.1885 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 |
| Internal Drive Style | Offset cruciform (torque set) |
| Length | 7/8 |
| Material | Steel |
| Material Specification | Mil-s-5626 mil spec 1st material response or mil-s-5000 mil spec 2nd material response or mil-s-6049 mil spec 3rd material response |
| Min. Tensile Strength (psi) | 160000 pounds per square inch |
| Surface Treatment | Cadmium and chromate |
| Surface Treatment Specification | Qq-p-416, type 2, class 2 fed spec all treatment responses |
| Thread Class | 3a |
| Thread Diameter | 0.190 |
| Thread Direction | Right-hand |
| Thread Length | 0.363 inches maximum |
| Thread Qty | 32 |
| Thread Qty Per Inch (tpi) | 32 |
| Thread Series Designator | UNJF |
| Thread Size | 10 |
| Weight | .005 lb |
Other sizes
Parts that share this base number, ordered by size. Always verify the full specification before substituting.
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.
- NAS1581F3T8 NAS #10-32 · 7/8 in · Flat countersunk · Steel
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Catalog data updated 2026-07-05. Report a data error