The Washer,flat, cataloged under National Stock Number 5310-01-080-8959, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Naval Sea Systems Command. Government technical data includes 8 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-080-8959 |
| Primary Part Number | 845-4558738 ITEM 86 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Overall Diameter | 1.750 INCHES MINIMUM AND 1.751 INCHES MAXIMUM IN |
| Material Document and Classification | QQ-N-281,CL A FED SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Cross-Sectional Shape Style | RECTANGULAR |
| Peripheral Shape Style | ROUND |
| Material | NICKEL ALLOY 400 OVERALL |
| Center Hole Shape Style | ROUND |
| Hole Diameter | 0.688 INCHES NOMINAL IN |
| Thickness | 0.140 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 |
|---|---|
| 845-4558738 ITEM 86 | Naval Sea Systems Command (USA) |
| Reference | Meaning |
|---|---|
| SS845-2050947 PIECE 18 | 5/2 Secondary reference U.S. Government activity |
| 255753 PIECE 30 | 5/9 Secondary reference Huntington Ingalls Inc Div Newport News Shipbuilding |
| 2641-809-40 ITEM 24 | 3/2 Design control — primary reference U.S. Government activity |
| 2641-405-11ITEM | C/1 Advisory reference — outside the item-of-supply concept U.S. Government activity |
| 2640-402X3 PIECE 18 | 5/2 Secondary reference U.S. Government activity |
NSN 5310-01-080-8959 is a Washer,flat, manufactured by Naval Sea Systems Command, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-080-8959 has 1 manufacturer part number on file: 845-4558738 ITEM 86 (Naval Sea Systems Command).
2 possible matches (shared part number, not a government interchangeability claim): 5310-01-633-5267, 5310-01-644-5347. Verify interchangeability with system specifications before substitution.
Key specifications for 845-4558738 ITEM 86: Overall Diameter: 1.750 INCHES MINIMUM AND 1.751 INCHES MAXIMUM IN; Material Document and Classification: QQ-N-281,CL A FED SPEC SINGLE MATERIAL RESPONSE OVERALL; Cross-Sectional Shape Style: RECTANGULAR; Peripheral Shape Style: ROUND. 8 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.