The Washer,convex, cataloged under National Stock Number 5310-00-930-1499, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Naval Group Site De Brest. Government technical data includes 6 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government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 | 5310-00-930-1499 |
| Primary Part Number | EPA21410-094 |
| Item Name | Washer,convex |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Naval Group Site De Brest |
| Status | ACTIVE |
| Style Designator | CONVEX |
| Material Document and Classification | MIL-S-20166 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Outside Diameter | 2.750 INCHES NOMINAL IN |
| Material Thickness | 0.438 INCHES NOMINAL IN |
| Material | STEEL COMP M OVERALL |
| Hole Diameter | 1.877 INCHES MINIMUM AND 1.882 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 |
|---|---|
| EPA21410-094 | Naval Group Site De Brest (FRA) |
| Reference | Meaning |
|---|---|
| 41443&1 | C/1 Advisory reference — outside the item-of-supply concept U.S. Government activity |
| 414443-1 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5310-00-930-1499 is a Washer,convex, manufactured by Naval Group Site De Brest, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-00-930-1499 has 1 manufacturer part number on file: EPA21410-094 (Naval Group Site De Brest).
2 possible matches (shared part number, not a government interchangeability claim): 4720-01-010-3729, 5331-01-279-0696. Verify interchangeability with system specifications before substitution.
Key specifications for EPA21410-094: Style Designator: CONVEX; Material Document and Classification: MIL-S-20166 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL; Outside Diameter: 2.750 INCHES NOMINAL IN; Material Thickness: 0.438 INCHES NOMINAL IN. 6 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.