The Nut,plain,extended Washer,hexago, cataloged under National Stock Number 5310-01-287-3581, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. Government technical data includes 18 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-287-3581 |
| Item Name | Nut,plain,extended Washer,hexago |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Status | ACTIVE |
| Washer Outside Diameter | 2.480 INCHES MINIMUM AND 2.500 INCHES MAXIMUM IN |
| Width Across Flats | 1.739 INCHES MINIMUM AND 1.752 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | MIL-P-23377 MIL SPEC SINGLE TREATMENT RESPONSE AND MIL-C-83286 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL EXCEPT THREADS |
| Thread Series | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Hardness Rating | 39.5 ROCKWELL C MINIMUM AND 43.0 ROCKWELL C MAXIMUM |
| Hole Configuration Style | CONFIGURATION B |
| Washer Thickness | 0.297 INCHES MINIMUM AND 0.317 INCHES MAXIMUM IN |
| Material Document and Classification | AMS 6414 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 1.500 INCHES IN |
| Drilled Hole Diameter | 0.069 INCHES MINIMUM AND 0.076 INCHES MAXIMUM IN |
| Surface Treatment | PAINT OVERALL |
| Countersink Angle | 90.0 DEGREES NOMINAL BASE |
| Nut Style | HEXAGON |
| Thread Class | 3B |
| Thread Quantity Per Inch | 12 |
| Material | STEEL COMP 4340 OVERALL |
| Hole Type and Quantity | 3 DRILLED |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| PL214-010-198-103 | 5/9 Secondary reference U.S. Government activity |
| 214-010-198-103 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5310-01-287-3581 is a Nut,plain,extended Washer,hexago, classified under FSC 5310, Nuts and Washers. Status: active.
Key specifications for 5310-01-287-3581: Overall Height: 1.590 INCHES MINIMUM AND 1.610 INCHES MAXIMUM IN; Washer Outside Diameter: 2.480 INCHES MINIMUM AND 2.500 INCHES MAXIMUM IN; Width Across Flats: 1.739 INCHES MINIMUM AND 1.752 INCHES MAXIMUM IN; Surface Treatment Document and Classification: MIL-P-23377 MIL SPEC SINGLE TREATMENT RESPONSE AND MIL-C-83286 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL EXCEPT THREADS. 18 specifications are documented in the U.S. Government catalog.
No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-16.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.