The Ring,retaining, cataloged under National Stock Number 5325-00-582-3971, is classified within Federal Supply Class 5325 (Fastening Devices) of the Hardware and Abrasives group. The manufacturer of record is Rolls-Royce Corporation. Government technical data includes 11 specifications, cited from the U.S. Government catalog. The record lists 4 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5325-00-582-3971 |
| Primary Part Number | 6726656-587 |
| Item Name | Ring,retaining |
| FSC / FSG | 5325 / 53 — Fastening Devices |
| Manufacturer | Rolls-Royce Corporation |
| Status | ACTIVE |
| Material Hardness Rating | 64.0 ROCKWELL C MINIMUM AND 71.8 ROCKWELL C MAXIMUM |
| Usage Design | INTERNAL |
| Strength Rating | ERR-060 |
| Material Document and Classification | SAE 1070-1090 ASSN STD SINGLE MATERIAL RESPONSE |
| Cross-Sectional Shape Style | DOUBLE OVAL |
| Outside Diameter | 6.077 INCHES NOMINAL IN |
| Major Thickness | 0.070 INCHES NOMINAL IN |
| Inside Diameter | 5.577 INCHES NOMINAL IN |
| Casehardening Indicator | NOT CASEHARDENED |
| Ring Style | SPECIAL FLAT |
| 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 |
|---|---|
| 6726656-587 | Rolls-Royce Corporation (USA) |
| 7M1250 | Caterpillar Inc Div Caterpillar Defense (USA) |
| 7M-1250 | Pon Equipment B.v. (NLD) |
| WH-587 | Smalley Steel Ring Co. (USA) |
| Reference | Meaning |
|---|---|
| RR587 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5325-00-582-3971 is a Ring,retaining, manufactured by Rolls-Royce Corporation, classified under FSC 5325, Fastening Devices. Status: active.
NSN 5325-00-582-3971 has 4 manufacturer part numbers on file: 6726656-587 (Rolls-Royce Corporation), 7M1250 (Caterpillar Inc Div Caterpillar Defense), 7M-1250 (Pon Equipment B.v.), WH-587 (Smalley Steel Ring Co.).
Key specifications for 6726656-587: Material Hardness Rating: 64.0 ROCKWELL C MINIMUM AND 71.8 ROCKWELL C MAXIMUM; Usage Design: INTERNAL; Strength Rating: ERR-060; Material Document and Classification: SAE 1070-1090 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.