The Washer,flat, cataloged under National Stock Number 5310-00-580-2256, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Portland Valve Llc. Government technical data includes 7 specifications, cited from the U.S. Government catalog. The record lists 3 manufacturer part numbers 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through both NSN and commercial part number lookups. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 5310-00-580-2256 |
| Primary Part Number | S2440-8-58 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Portland Valve Llc |
| Status | ACTIVE |
| Overall Diameter | 1.062 INCHES NOMINAL IN |
| Cross-Sectional Shape Style | RECTANGULAR |
| Peripheral Shape Style | ROUND |
| Material | PLASTIC POLYAMIDE NYLON OVERALL |
| Center Hole Shape Style | ROUND |
| Hole Diameter | 0.625 INCHES NOMINAL IN |
| Thickness | 0.095 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 |
|---|---|
| 006-0009-53 | Portland Valve Llc (USA) |
| S2440-8-58 PRIMARY | Portland Valve Llc (USA) |
| S2440EPCALL1 1-4 PRIMARY | Portland Valve Llc (USA) |
| Reference | Meaning |
|---|---|
| 3328646PC006000958 | 5/9 Secondary reference U.S. Government activity |
| 580-516-1609904LINE5 | 5/9 Secondary reference U.S. Government activity |
| 5DPN36GTPC2440-8-58 | 5/9 Secondary reference Portland Valve Llc |
| 0166CPC006000958 | 5/9 Secondary reference Portland Valve Llc |
| 006-0009-58 | C/1 Advisory reference — outside the item-of-supply concept Zf Industrieantriebe Witten Gmbh |
NSN 5310-00-580-2256 is a Washer,flat, manufactured by Portland Valve Llc, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-00-580-2256 has 3 manufacturer part numbers on file: 006-0009-53 (Portland Valve Llc), S2440-8-58 (Portland Valve Llc), S2440EPCALL1 1-4 (Portland Valve Llc).
1 possible match (shared part number, not a government interchangeability claim): 5310-00-580-2258. Verify interchangeability with system specifications before substitution.
Key specifications for S2440-8-58: Overall Diameter: 1.062 INCHES NOMINAL IN; Cross-Sectional Shape Style: RECTANGULAR; Peripheral Shape Style: ROUND; Material: PLASTIC POLYAMIDE NYLON OVERALL. 7 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.