The Washer,flat, cataloged under National Stock Number 5310-01-508-1291, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Northrop Grumman Systems Corporation Dba Northrop Grumman Systems Corp. Government technical data includes 10 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-508-1291 |
| Primary Part Number | 6390826-9 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Northrop Grumman Systems Corporation Dba Northrop Grumman Systems Corp |
| Status | ACTIVE |
| Surface Treatment Document and Classification | AMS 2488B, TYPE 2 ASSN STD 1ST TREATMENT RESPONSE OVERALL |
| Overall Diameter | 1.312 INCHES NOMINAL IN |
| Material Document and Classification | MIL-T-9046, COMP CP-3 OR AB-2 MIL SPEC 1ST MATERIAL RESPONSE OR MIL-T-9047, COMP 6A1-4V, CONDITION A MIL SPEC 2ND MATERIAL RESPONSE OVERALL V |
| Cross-Sectional Shape Style | RECTANGULAR |
| Surface Treatment | ANODIZE OVERALL |
| Peripheral Shape Style | ROUND |
| Material | TITANIUM ALLOY UNS R56401 OVERALL |
| Center Hole Shape Style | ROUND |
| Hole Diameter | 0.765 INCHES NOMINAL IN |
| Thickness | 0.090 INCHES NOMINAL IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
NSN 5310-01-508-1291 is a Washer,flat, manufactured by Northrop Grumman Systems Corporation Dba Northrop Grumman Systems Corp, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-508-1291 has 2 manufacturer part numbers on file: 6390826-9 (Naval Sea Systems Command), 6390826-9 (Northrop Grumman Systems Corporation Dba Northrop Grumman Systems Corp).
Key specifications for 6390826-9: Surface Treatment Document and Classification: AMS 2488B, TYPE 2 ASSN STD 1ST TREATMENT RESPONSE OVERALL; Overall Diameter: 1.312 INCHES NOMINAL IN; Material Document and Classification: MIL-T-9046, COMP CP-3 OR AB-2 MIL SPEC 1ST MATERIAL RESPONSE OR MIL-T-9047, COMP 6A1-4V, CONDITION A MIL SPEC 2ND MATERIAL RESPONSE OVERALL V; Cross-Sectional Shape Style: RECTANGULAR. 10 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.