The Washer,spring Tension, cataloged under National Stock Number 5310-01-421-1910, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Eaton Aerospace Llc Dba Eaton Inoac Div Fuel & Motion Control Systems Division. The record lists 2 manufacturer part numbers 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Item Name | Washer,spring Tension |
| FSC / FSG | 5310 — Nuts and Washers (FSG 53) |
| Manufacturers | Barnes Group Inc. (CAGE 74197); Eaton Aerospace Llc Dba Eaton Inoac Div Fuel & Motion Control Systems Division (CAGE 17472) |
| Parameter | Value |
|---|---|
| NSN | 5310-01-421-1910 |
| Primary Part Number | 999657-08 |
| Item Name | Washer,spring Tension |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Eaton Aerospace Llc Dba Eaton Inoac Div Fuel & Motion Control Systems Division |
| 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 |
|---|---|
| B0750-056-S | Barnes Group Inc. (USA) |
| 999657-08 PRIMARY | Eaton Aerospace Llc Dba Eaton Inoac Div Fuel & Motion Control Systems Division (USA) |
| Reference | Meaning |
|---|---|
| 13017506 | 7/2 Vendor item drawing reference Combat Capabilities Development Command (ccdc) Armaments Center Dba Ccdc Div Logistics Research and Engineering Directorate |
| B0750-056-S | 5/9 Secondary reference Barnes Group Inc |
NSN 5310-01-421-1910 is a Washer,spring Tension, manufactured by Eaton Aerospace Llc Dba Eaton Inoac Div Fuel & Motion Control Systems Division, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-421-1910 has 2 manufacturer part numbers on file: B0750-056-S (Barnes Group Inc.), 999657-08 (Eaton Aerospace Llc Dba Eaton Inoac Div Fuel & Motion Control Systems Division).
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.