The O-Ring, cataloged under National Stock Number 5331-01-527-7570, is classified within Federal Supply Class 5331 (O-ring) of the Hardware and Abrasives group. The manufacturer of record is Caterpillar Inc Div Caterpillar Defense. 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Item Name | O-Ring |
| FSC / FSG | 5331 — O-ring (FSG 53) |
| Manufacturers | Caterpillar Inc Div Caterpillar Defense (CAGE 11083); Hastings Deering (aust) Pty Ltd (CAGE ZF912); Westrac Equipment Pty Ltd (CAGE Z02C9); William Adams Pty Ltd (CAGE Z8Q46) |
| Parameter | Value |
|---|---|
| NSN | 5331-01-527-7570 |
| Primary Part Number | 2257739 |
| Item Name | O-Ring |
| FSC / FSG | 5331 / 53 — O-ring |
| Manufacturer | Caterpillar Inc Div Caterpillar Defense |
| Status | ACTIVE |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Part Number | Manufacturer |
|---|---|
| 2257739 PRIMARY | Caterpillar Inc Div Caterpillar Defense (USA) |
| 225-7739 | Hastings Deering (aust) Pty Ltd (AUS) |
| 225-7739 | Westrac Equipment Pty Ltd (AUS) |
| 225-7739 | William Adams Pty Ltd (AUS) |
| Reference | Meaning |
|---|---|
| 10076261 | 6/9 Informative reference only Nimikkeistokeskus Ncb Finland |
NSN 5331-01-527-7570 is a O-Ring, manufactured by Caterpillar Inc Div Caterpillar Defense, classified under FSC 5331, O-ring. Status: active.
NSN 5331-01-527-7570 has 4 manufacturer part numbers on file: 2257739 (Caterpillar Inc Div Caterpillar Defense), 225-7739 (Hastings Deering (aust) Pty Ltd), 225-7739 (Westrac Equipment Pty Ltd), 225-7739 (William Adams Pty Ltd).
1 possible match (shared part number, not a government interchangeability claim): 1650-01-673-1924. Verify interchangeability with system specifications before substitution.
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.