The Ring,retaining, cataloged under National Stock Number 5325-01-340-1627, is classified within Federal Supply Class 5325 (Fastening Devices) of the Hardware and Abrasives group. The manufacturer of record is Nasco Aircraft Brake, Inc. Dba Nasco Aircraft Brake Inc Div Nasco. Government technical data includes 11 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 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 | 5325-01-340-1627 |
| Primary Part Number | 23821 |
| Item Name | Ring,retaining |
| FSC / FSG | 5325 / 53 — Fastening Devices |
| Manufacturer | Nasco Aircraft Brake, Inc. Dba Nasco Aircraft Brake Inc Div Nasco |
| Status | ACTIVE |
| Usage Design | INTERNAL |
| End Style | VERTEX CENTER OR ABOVE |
| Material Diameter | 0.125 INCHES NOMINAL IN |
| Material Document and Classification | MIL-W-6101 MIL SPEC SINGLE MATERIAL RESPONSE |
| Cross-Sectional Shape Style | ROUND |
| Outside Diameter | 3.770 INCHES NOMINAL IN |
| Inside Diameter | 3.520 INCHES NOMINAL IN |
| Casehardening Indicator | CASEHARDENED |
| Ring Style | STRAIGHT GAP |
| Surface Treatment | OXIDE |
| Material | STEEL |
| 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 |
|---|---|
| 23821 PRIMARY | Nasco Aircraft Brake, Inc. Dba Nasco Aircraft Brake Inc Div Nasco (USA) |
NSN 5325-01-340-1627 is a Ring,retaining, manufactured by Nasco Aircraft Brake, Inc. Dba Nasco Aircraft Brake Inc Div Nasco, classified under FSC 5325, Fastening Devices. Status: active.
NSN 5325-01-340-1627 has 1 manufacturer part number on file: 23821 (Nasco Aircraft Brake, Inc. Dba Nasco Aircraft Brake Inc Div Nasco).
2 possible matches (shared part number, not a government interchangeability claim): 5310-01-425-3062, 5133-01-443-3078. Verify interchangeability with system specifications before substitution.
Key specifications for 23821: Usage Design: INTERNAL; End Style: VERTEX CENTER OR ABOVE; Material Diameter: 0.125 INCHES NOMINAL IN; Material Document and Classification: MIL-W-6101 MIL SPEC SINGLE MATERIAL RESPONSE. 11 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.