The Ring,retaining, cataloged under National Stock Number 5325-01-201-4778, is classified within Federal Supply Class 5325 (Fastening Devices) of the Hardware and Abrasives group. Government technical data includes 11 specifications, cited from the U.S. Government catalog. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5325-01-201-4778 |
| Item Name | Ring,retaining |
| FSC / FSG | 5325 / 53 — Fastening Devices |
| Status | ACTIVE |
| Material Hardness Rating | 45.0 ROCKWELL C MINIMUM AND 52.0 ROCKWELL C MAXIMUM |
| Usage Design | INTERNAL |
| Surface Treatment Document and Classification | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE |
| Material Document and Classification | AMS 5520 ASSN STD SINGLE MATERIAL RESPONSE |
| Cross-Sectional Shape Style | RECTANGULAR |
| Outside Diameter | 3.363 INCHES MINIMUM AND 3.473 INCHES MAXIMUM IN |
| Major Thickness | 0.1098 INCHES MINIMUM AND 0.1120 INCHES MAXIMUM IN |
| Casehardening Indicator | NOT CASEHARDENED |
| Ring Style | INTERNAL |
| Surface Treatment | PASSIVATE |
| Material | STEEL COMP 632 |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| 1213E2815 FIND 61 | 5/1 Secondary reference Lockheed Martin Corporation Div Rms |
| MS16625-4306 | 2/2 Government specification standardization U.S. Government activity |
| MIL-DTL-21248 | 4/1 Identification reference U.S. Government activity |
| 5325PL1390730 | 6/9 Informative reference only Jednolity Indeks Materialowy - Uniform Material Index |
| 1213E2815 FIND 61 | 5/9 Secondary reference Martin Marietta Technologies Inc Sub of Martin Marietta Corp Aero and Naval Systems |
NSN 5325-01-201-4778 is a Ring,retaining, classified under FSC 5325, Fastening Devices. Status: active.
Key specifications for 5325-01-201-4778: Material Hardness Rating: 45.0 ROCKWELL C MINIMUM AND 52.0 ROCKWELL C MAXIMUM; Usage Design: INTERNAL; Surface Treatment Document and Classification: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE; Material Document and Classification: AMS 5520 ASSN STD 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.