The Washer,flat, cataloged under National Stock Number 5310-01-251-7574, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Avox Systems Inc Dba Avox Systems Inc. Government technical data includes 8 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government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 | 5310-01-251-7574 |
| Primary Part Number | 56976 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Avox Systems Inc Dba Avox Systems Inc |
| Status | ACTIVE |
| Overall Diameter | 0.382 INCHES MINIMUM AND 0.398 INCHES MAXIMUM IN |
| Material Document and Classification | ZZ-R-765 FED SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Cross-Sectional Shape Style | RECTANGULAR |
| Peripheral Shape Style | ROUND |
| Material | RUBBER SILICONE CLASS Q OVERALL |
| Center Hole Shape Style | ROUND |
| Hole Diameter | 0.226 INCHES MINIMUM AND 0.242 INCHES MAXIMUM IN |
| Thickness | 0.026 INCHES MINIMUM AND 0.036 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 |
NSN 5310-01-251-7574 is a Washer,flat, manufactured by Avox Systems Inc Dba Avox Systems Inc, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-251-7574 has 2 manufacturer part numbers on file: 56976 (Avox Systems Inc Dba Avox Systems Inc), 56976-00 (Avox Systems Inc Dba Avox Systems Inc).
2 possible matches (shared part number, not a government interchangeability claim): 1630-01-672-9238, 6150-01-692-8962. Verify interchangeability with system specifications before substitution.
Key specifications for 56976: Overall Diameter: 0.382 INCHES MINIMUM AND 0.398 INCHES MAXIMUM IN; Material Document and Classification: ZZ-R-765 FED SPEC SINGLE MATERIAL RESPONSE OVERALL; Cross-Sectional Shape Style: RECTANGULAR; Peripheral Shape Style: ROUND. 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.