The Ring,retaining, cataloged under National Stock Number 5325-00-526-4056, is classified within Federal Supply Class 5325 (Fastening Devices) of the Hardware and Abrasives group. The manufacturer of record is Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney. Government technical data includes 10 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through both NSN and commercial part number lookups. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5325-00-526-4056 |
| Primary Part Number | 4044390 |
| Item Name | Ring,retaining |
| FSC / FSG | 5325 / 53 — Fastening Devices |
| Manufacturer | Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney |
| Status | ACTIVE |
| Usage Design | EXTERNAL |
| End Style | VERTEX CENTER OR ABOVE |
| Material Diameter | 0.061 INCHES MINIMUM AND 0.063 INCHES MAXIMUM IN |
| Material Document and Classification | AMS 5687 ASSN STD SINGLE MATERIAL RESPONSE |
| Cross-Sectional Shape Style | ROUND |
| Outside Diameter | 0.326 INCHES MINIMUM AND 0.332 INCHES MAXIMUM IN |
| Inside Diameter | 0.200 INCHES MINIMUM AND 0.210 INCHES MAXIMUM IN |
| Casehardening Indicator | NOT CASEHARDENED |
| Ring Style | STRAIGHT GAP |
| Material | NICKEL ALLOY 600 |
| 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 |
|---|---|
| 4044390 PRIMARY | Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney (USA) |
| Reference | Meaning |
|---|---|
| 4044390 | 5/9 Secondary reference Hoffmann-Werke |
| 4044390 | C/1 Advisory reference — outside the item-of-supply concept U.S. Government activity |
| 4044390 | C/1 Advisory reference — outside the item-of-supply concept Turbo Power & Marine System Inc Sub of United Technologies Corp |
| 4044390 | C/1 Advisory reference — outside the item-of-supply concept U.S. Government activity |
| 4044390 | C/1 Advisory reference — outside the item-of-supply concept Dcp Spring Acquisition Company, Inc. Dba New England Spring Div New England Spring |
NSN 5325-00-526-4056 is a Ring,retaining, manufactured by Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney, classified under FSC 5325, Fastening Devices. Status: active.
NSN 5325-00-526-4056 has 1 manufacturer part number on file: 4044390 (Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney).
Key specifications for 4044390: Usage Design: EXTERNAL; End Style: VERTEX CENTER OR ABOVE; Material Diameter: 0.061 INCHES MINIMUM AND 0.063 INCHES MAXIMUM IN; Material Document and Classification: AMS 5687 ASSN STD SINGLE MATERIAL RESPONSE. 10 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.