The Ring,retaining, cataloged under National Stock Number 5325-01-087-2978, is classified within Federal Supply Class 5325 (Fastening Devices) of the Hardware and Abrasives group. The manufacturer of record is Aar Allen Services, Inc Dba Aar Component Services Wellington. 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. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5325-01-087-2978 |
| Primary Part Number | 502318 |
| Item Name | Ring,retaining |
| FSC / FSG | 5325 / 53 — Fastening Devices |
| Manufacturer | Aar Allen Services, Inc Dba Aar Component Services Wellington |
| Status | ACTIVE |
| Usage Design | EXTERNAL OR INTERNAL |
| End Style | VERTEX CENTER OR ABOVE |
| Material Diameter | 0.030 INCHES MINIMUM AND 0.032 INCHES MAXIMUM IN |
| Material Document and Classification | QQ-W-423, 302 FED SPEC SINGLE MATERIAL RESPONSE |
| Cross-Sectional Shape Style | ROUND |
| Outside Diameter | 0.465 INCHES MINIMUM AND 0.470 INCHES MAXIMUM IN |
| Inside Diameter | 0.433 INCHES MINIMUM AND 0.440 INCHES MAXIMUM IN |
| Casehardening Indicator | NOT CASEHARDENED |
| Ring Style | STRAIGHT GAP |
| Surface Treatment | PASSIVATE |
| Material | STEEL COMP 302 |
| 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 |
|---|---|
| 502318 PRIMARY | Aar Allen Services, Inc Dba Aar Component Services Wellington (USA) |
NSN 5325-01-087-2978 is a Ring,retaining, manufactured by Aar Allen Services, Inc Dba Aar Component Services Wellington, classified under FSC 5325, Fastening Devices. Status: active.
NSN 5325-01-087-2978 has 1 manufacturer part number on file: 502318 (Aar Allen Services, Inc Dba Aar Component Services Wellington).
Key specifications for 502318: Usage Design: EXTERNAL OR INTERNAL; End Style: VERTEX CENTER OR ABOVE; Material Diameter: 0.030 INCHES MINIMUM AND 0.032 INCHES MAXIMUM IN; Material Document and Classification: QQ-W-423, 302 FED 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.