The Ring,retaining, cataloged under National Stock Number 5325-01-087-3556, is classified within Federal Supply Class 5325 (Fastening Devices) of the Hardware and Abrasives group. The manufacturer of record is Telemechanics Inc. Government technical data includes 9 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5325-01-087-3556 |
| Primary Part Number | 402991 |
| Item Name | Ring,retaining |
| FSC / FSG | 5325 / 53 — Fastening Devices |
| Manufacturer | Telemechanics Inc |
| Status | ACTIVE |
| Usage Design | EXTERNAL |
| End Style | VERTEX OUTSIDE PERIPHERY |
| Cross-Sectional Shape Style | RECTANGULAR |
| Outside Diameter | 1.562 INCHES NOMINAL IN |
| Major Thickness | 0.031 INCHES NOMINAL IN |
| Inside Diameter | 1.250 INCHES NOMINAL IN |
| Casehardening Indicator | NOT CASEHARDENED |
| Ring Style | STRAIGHT GAP |
| 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 |
|---|---|
| 402991 PRIMARY | Telemechanics Inc (USA) |
| Reference | Meaning |
|---|---|
| 402991 | 5/9 Secondary reference American Telephone and Telegraph Co |
NSN 5325-01-087-3556 is a Ring,retaining, manufactured by Telemechanics Inc, classified under FSC 5325, Fastening Devices. Status: active.
NSN 5325-01-087-3556 has 1 manufacturer part number on file: 402991 (Telemechanics Inc).
Key specifications for 402991: Usage Design: EXTERNAL; End Style: VERTEX OUTSIDE PERIPHERY; Cross-Sectional Shape Style: RECTANGULAR; Outside Diameter: 1.562 INCHES NOMINAL IN. 9 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.