The Washer,flat, cataloged under National Stock Number 5310-00-032-0263, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Lockheed Martin Corporation Div Rms - Mitchel Field. 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. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-00-032-0263 |
| Primary Part Number | 265629 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Lockheed Martin Corporation Div Rms - Mitchel Field |
| Status | ACTIVE |
| Surface Treatment Document and Classification | AMS 2408 ASSN STD SINGLE TREATMENT RESPONSE OVERALL |
| Overall Diameter | 0.859 INCHES MINIMUM AND 0.891 INCHES MAXIMUM IN |
| Material Document and Classification | QQ-B-613 1/2 HARD FED SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Cross-Sectional Shape Style | RECTANGULAR |
| Surface Treatment | TIN OVERALL |
| Peripheral Shape Style | ROUND |
| Material | COPPER ALLOY 268 OVERALL |
| Center Hole Shape Style | ROUND |
| Hole Diameter | 0.375 INCHES MINIMUM AND 0.391 INCHES MAXIMUM IN |
| Thickness | 0.016 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 |
| Part Number | Manufacturer |
|---|---|
| 265629 PRIMARY | Lockheed Martin Corporation Div Rms - Mitchel Field (USA) |
| 554-00-020201047 | Diehl Defence Gmbh & Co. Kg (DEU) |
NSN 5310-00-032-0263 is a Washer,flat, manufactured by Lockheed Martin Corporation Div Rms - Mitchel Field, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-00-032-0263 has 2 manufacturer part numbers on file: 265629 (Lockheed Martin Corporation Div Rms - Mitchel Field), 554-00-020201047 (Diehl Defence Gmbh & Co. Kg).
1 possible match (shared part number, not a government interchangeability claim): 5950-00-615-5203. Verify interchangeability with system specifications before substitution.
Key specifications for 265629: Surface Treatment Document and Classification: AMS 2408 ASSN STD SINGLE TREATMENT RESPONSE OVERALL; Overall Diameter: 0.859 INCHES MINIMUM AND 0.891 INCHES MAXIMUM IN; Material Document and Classification: QQ-B-613 1/2 HARD FED SPEC SINGLE MATERIAL RESPONSE OVERALL; 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.