The Washer,concave, cataloged under National Stock Number 5310-01-534-6955, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Lockheed Martin Corporation. 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-534-6955 |
| Primary Part Number | 13506281 |
| Item Name | Washer,concave |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Lockheed Martin Corporation |
| Status | ACTIVE |
| Style Designator | RECESSED |
| Material Document and Classification | A108 ASSN STD ALL MATERIAL RESPONSES OVERALL |
| Outside Diameter | 36.0 MILLIMETERS NOMINAL MM |
| Material Thickness | 7.5 MILLIMETERS NOMINAL MM |
| Recess Diameter | 31.0 MILLIMETERS NOMINAL MM |
| Material | STEEL COMP 1010 OR STEEL COMP 1020 OVERALL |
| Hole Diameter | 22.0 MILLIMETERS MINIMUM AND 24.0 MILLIMETERS MAXIMUM MM |
| Recess Angle | 120.0 DEGREES NOMINAL |
| 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 |
|---|---|
| 13506281 PRIMARY | Lockheed Martin Corporation (USA) |
| Reference | Meaning |
|---|---|
| 13506281 | 5/9 Secondary reference Us Army Aviation and Missile Command |
NSN 5310-01-534-6955 is a Washer,concave, manufactured by Lockheed Martin Corporation, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-534-6955 has 1 manufacturer part number on file: 13506281 (Lockheed Martin Corporation).
Key specifications for 13506281: Style Designator: RECESSED; Material Document and Classification: A108 ASSN STD ALL MATERIAL RESPONSES OVERALL; Outside Diameter: 36.0 MILLIMETERS NOMINAL MM; Material Thickness: 7.5 MILLIMETERS NOMINAL MM. 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.