The Washer,recessed, cataloged under National Stock Number 5310-01-357-1645, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Senior Operations Llc Dba Metal Bellows Div Metal Bellows. 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Item Name | Washer,recessed |
| FSC / FSG | 5310 — Nuts and Washers (FSG 53) |
| Manufacturers | Senior Operations Llc Dba Metal Bellows Div Metal Bellows (CAGE 07649) |
| Parameter | Value |
|---|---|
| NSN | 5310-01-357-1645 |
| Primary Part Number | 8777-1 |
| Item Name | Washer,recessed |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Senior Operations Llc Dba Metal Bellows Div Metal Bellows |
| Status | ACTIVE |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Part Number | Manufacturer |
|---|---|
| 8777-1 PRIMARY | Senior Operations Llc Dba Metal Bellows Div Metal Bellows (USA) |
| Reference | Meaning |
|---|---|
| 8777-1 | 3/9 Design control — primary reference Senior Flexonics Inc |
| 87771-1 | C/1 Advisory reference — outside the item-of-supply concept Zf Industrieantriebe Witten Gmbh |
NSN 5310-01-357-1645 is a Washer,recessed, manufactured by Senior Operations Llc Dba Metal Bellows Div Metal Bellows, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-357-1645 has 1 manufacturer part number on file: 8777-1 (Senior Operations Llc Dba Metal Bellows Div Metal Bellows).
1 possible match (shared part number, not a government interchangeability claim): 8465-01-616-3845. Verify interchangeability with system specifications before substitution.
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.