The Ring,retaining, cataloged under National Stock Number 5325-00-285-2131, is classified within Federal Supply Class 5325 (Fastening Devices) of the Hardware and Abrasives group. The manufacturer of record is Caterpillar Inc Div Caterpillar Defense. 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 5325-00-285-2131 |
| Primary Part Number | 3F8181 |
| Item Name | Ring,retaining |
| FSC / FSG | 5325 / 53 — Fastening Devices |
| Manufacturer | Caterpillar Inc Div Caterpillar Defense |
| Status | ACTIVE |
| Usage Design | INTERNAL |
| End Style | VERTEX BELOW CENTER |
| Cross-Sectional Shape Style | ROUNDED CORNERS |
| Outside Diameter | 2.150 INCHES NOMINAL IN |
| Major Thickness | 0.093 INCHES NOMINAL IN |
| Inside Diameter | 1.964 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 |
|---|---|
| 3F8181 PRIMARY | Caterpillar Inc Div Caterpillar Defense (USA) |
| Reference | Meaning |
|---|---|
| 9JA861 | 3/1 Design control — primary reference U.S. Government activity |
NSN 5325-00-285-2131 is a Ring,retaining, manufactured by Caterpillar Inc Div Caterpillar Defense, classified under FSC 5325, Fastening Devices. Status: active.
NSN 5325-00-285-2131 has 1 manufacturer part number on file: 3F8181 (Caterpillar Inc Div Caterpillar Defense).
Key specifications for 3F8181: Usage Design: INTERNAL; End Style: VERTEX BELOW CENTER; Cross-Sectional Shape Style: ROUNDED CORNERS; Outside Diameter: 2.150 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.