The Ring,retaining, cataloged under National Stock Number 5325-00-898-7448, is classified within Federal Supply Class 5325 (Fastening Devices) of the Hardware and Abrasives group. The manufacturer of record is Allison Transmission Inc Dba Allison Transmission, Inc. Government technical data includes 5 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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.
| Parameter | Value |
|---|---|
| NSN | 5325-00-898-7448 |
| Primary Part Number | 6821639 |
| Item Name | Ring,retaining |
| FSC / FSG | 5325 / 53 — Fastening Devices |
| Manufacturer | Allison Transmission Inc Dba Allison Transmission, Inc |
| Status | ACTIVE |
| Material Hardness Rating | 48.0 ROCKWELL C NOMINAL |
| Usage Design | EXTERNAL |
| Material Document and Classification | AMS 6415 ASSN STD SINGLE MATERIAL RESPONSE |
| Surface Treatment | SILVER |
| Material | STEEL COMP 4340 |
| 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 |
|---|---|
| 6821639 | General Motors Corp (USA) |
| 6821639 PRIMARY | Allison Transmission Inc Dba Allison Transmission, Inc (USA) |
| Reference | Meaning |
|---|---|
| 6821639 | 5/9 Secondary reference Rolls-Royce Corporation |
| 6786894 | 5/9 Secondary reference Allison Transmission Inc Dba Allison Transmission, Inc |
NSN 5325-00-898-7448 is a Ring,retaining, manufactured by Allison Transmission Inc Dba Allison Transmission, Inc, classified under FSC 5325, Fastening Devices. Status: active.
NSN 5325-00-898-7448 has 2 manufacturer part numbers on file: 6821639 (General Motors Corp), 6821639 (Allison Transmission Inc Dba Allison Transmission, Inc).
1 possible match (shared part number, not a government interchangeability claim): 2590-01-565-8175. Verify interchangeability with system specifications before substitution.
Key specifications for 6821639: Material Hardness Rating: 48.0 ROCKWELL C NOMINAL; Usage Design: EXTERNAL; Material Document and Classification: AMS 6415 ASSN STD SINGLE MATERIAL RESPONSE; Surface Treatment: SILVER. 5 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.