The Washer,flat, cataloged under National Stock Number 5310-00-039-5374, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Hamilton Sundstrand Corporation Dba Collins Aerospace. 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 3 items share a part number with this NSN in the catalog (possible match — not a government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 | 5310-00-039-5374 |
| Primary Part Number | 88939 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Hamilton Sundstrand Corporation Dba Collins Aerospace |
| Status | ACTIVE |
| Overall Diameter | 0.940 INCHES NOMINAL IN |
| Hardness Rating | 53.0 ROCKWELL C MINIMUM AND 58.0 ROCKWELL C MAXIMUM |
| Cross-Sectional Shape Style | RECTANGULAR |
| Peripheral Shape Style | ROUND |
| Material | STEEL OVERALL |
| Center Hole Shape Style | ROUND |
| Hole Diameter | 0.540 INCHES MINIMUM AND 0.548 INCHES MAXIMUM IN |
| Thickness | 0.058 INCHES MINIMUM AND 0.062 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 |
|---|---|
| 88939 PRIMARY | Hamilton Sundstrand Corporation Dba Collins Aerospace (USA) |
| 88939 | Federal Procurement Agency (USA) |
| Reference | Meaning |
|---|---|
| 5310000395374 | 6/9 Informative reference only E.c.a Etablissement Central Des Approvisionnements Des Forces Armees Royales |
NSN 5310-00-039-5374 is a Washer,flat, manufactured by Hamilton Sundstrand Corporation Dba Collins Aerospace, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-00-039-5374 has 2 manufacturer part numbers on file: 88939 (Hamilton Sundstrand Corporation Dba Collins Aerospace), 88939 (Federal Procurement Agency).
3 possible matches (shared part number, not a government interchangeability claim): 6145-00-635-3566, 6680-01-029-7317, 5130-01-682-2754. Verify interchangeability with system specifications before substitution.
Key specifications for 88939: Overall Diameter: 0.940 INCHES NOMINAL IN; Hardness Rating: 53.0 ROCKWELL C MINIMUM AND 58.0 ROCKWELL C MAXIMUM; 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.