The Washer,lock, cataloged under National Stock Number 5310-01-533-8737, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Department of Defense Project Manager-Mobile Electric Power. Government technical data includes 7 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. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-533-8737 |
| Primary Part Number | 88-20556-33 |
| Item Name | Washer,lock |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Department of Defense Project Manager-Mobile Electric Power |
| Status | ACTIVE |
| Style Designator | SPLIT HELICAL-RIGHT HAND |
| Material Document and Classification | PHOSPHOR BRONZE IN ACCORDANCE WITH AMSE B18.21.1 OR TIN-BRASS, COMPOSITION 425 (UNS C42500) NATIONAL SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Outside Diameter | 1.073 INCHES MAXIMUM IN |
| Material Thickness | 0.156 INCHES MINIMUM IN |
| Surface Treatment | CADMIUM OR ZINC OVERALL |
| Material | COPPER ALLOY OVERALL |
| Hole Diameter | 0.628 INCHES MINIMUM AND 0.641 INCHES MAXIMUM 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 |
|---|---|
| 88-20556-33 PRIMARY | Department of Defense Project Manager-Mobile Electric Power (USA) |
NSN 5310-01-533-8737 is a Washer,lock, manufactured by Department of Defense Project Manager-Mobile Electric Power, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-533-8737 has 1 manufacturer part number on file: 88-20556-33 (Department of Defense Project Manager-Mobile Electric Power).
Key specifications for 88-20556-33: Style Designator: SPLIT HELICAL-RIGHT HAND; Material Document and Classification: PHOSPHOR BRONZE IN ACCORDANCE WITH AMSE B18.21.1 OR TIN-BRASS, COMPOSITION 425 (UNS C42500) NATIONAL SPEC SINGLE MATERIAL RESPONSE OVERALL; Outside Diameter: 1.073 INCHES MAXIMUM IN; Material Thickness: 0.156 INCHES MINIMUM IN. 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.