The Washer,lock, cataloged under National Stock Number 5310-00-252-0212, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Marathonnorco Aerospace, Inc. Dba Marathon Power Technologies Company. Government technical data includes 5 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. 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 | 5310-00-252-0212 |
| Primary Part Number | 6560-21 |
| Item Name | Washer,lock |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Marathonnorco Aerospace, Inc. Dba Marathon Power Technologies Company |
| Status | ACTIVE |
| Style Designator | SPLIT HELICAL-RIGHT HAND |
| Outside Diameter | 0.312 INCHES NOMINAL IN |
| Material Thickness | 0.032 INCHES NOMINAL IN |
| Material | STEEL CORROSION RESISTING OVERALL |
| Hole Diameter | 0.188 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 |
|---|---|
| 6560-21 PRIMARY | Marathonnorco Aerospace, Inc. Dba Marathon Power Technologies Company (USA) |
NSN 5310-00-252-0212 is a Washer,lock, manufactured by Marathonnorco Aerospace, Inc. Dba Marathon Power Technologies Company, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-00-252-0212 has 1 manufacturer part number on file: 6560-21 (Marathonnorco Aerospace, Inc. Dba Marathon Power Technologies Company).
2 possible matches (shared part number, not a government interchangeability claim): 1680-00-497-6283, 5955-01-357-2523. Verify interchangeability with system specifications before substitution.
Key specifications for 6560-21: Style Designator: SPLIT HELICAL-RIGHT HAND; Outside Diameter: 0.312 INCHES NOMINAL IN; Material Thickness: 0.032 INCHES NOMINAL IN; Material: STEEL CORROSION RESISTING OVERALL. 5 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.