The Ring,backup, cataloged under National Stock Number 2590-01-104-4081, is classified within Federal Supply Class 2590 (Miscellaneous Vehicular Components) of the Vehicular Equipment Components group. The manufacturer of record is Caterpillar Inc Div Caterpillar Defense. Government technical data includes 2 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 2590-01-104-4081 |
| Primary Part Number | 538158 |
| Item Name | Ring,backup |
| FSC / FSG | 2590 / 25 — Miscellaneous Vehicular Components |
| Manufacturer | Caterpillar Inc Div Caterpillar Defense |
| Status | ACTIVE |
| General Characteristics Item Description | 10.000 IN. OD BY 9.500 IN. ID IN |
| Criticality Code Justification | FEAT |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | Y |
| Part Number | Manufacturer |
|---|---|
| 538158 | Caterpillar Inc Div Caterpillar Defense (USA) |
| Reference | Meaning |
|---|---|
| 897448 | 3/9 Design control — primary reference Remco Hydraulics Inc Sierra Cylinders Product Line |
NSN 2590-01-104-4081 is a Ring,backup, manufactured by Caterpillar Inc Div Caterpillar Defense, classified under FSC 2590, Miscellaneous Vehicular Components. Status: active.
NSN 2590-01-104-4081 has 1 manufacturer part number on file: 538158 (Caterpillar Inc Div Caterpillar Defense).
1 possible match (shared part number, not a government interchangeability claim): 5895-01-531-7679. Verify interchangeability with system specifications before substitution.
Key specifications for 538158: General Characteristics Item Description: 10.000 IN. OD BY 9.500 IN. ID IN; Criticality Code Justification: FEAT; Special Features: WEAPON SYSTEM ESSENTIAL; End Item Identification: MX MISSILE. 2 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.