The O-Ring, cataloged under National Stock Number 5331-01-351-2736, 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Item Name | O-Ring |
| FSC / FSG | 5331 — O-ring (FSG 53) |
| Manufacturers | Caterpillar Inc Div Caterpillar Defense (CAGE 11083); Navantia Sa Sme. Div Navantia Hq (CAGE 0141B); Navantia - Propulsion Y Energia Motores - Cartagena (CAGE 409BB) |
| Parameter | Value |
|---|---|
| NSN | 5331-01-351-2736 |
| Primary Part Number | 6I4545 |
| 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 |
|---|---|
| 6I4545 PRIMARY | Caterpillar Inc Div Caterpillar Defense (USA) |
| 9Y6521 ITEM 2 | Caterpillar Inc Div Caterpillar Defense (USA) |
| 6I-4545 | Navantia Sa Sme. Div Navantia Hq (ESP) |
| 6I-4545 | Navantia - Propulsion Y Energia Motores - Cartagena (ESP) |
| Reference | Meaning |
|---|---|
| 8T0115 | 5/9 Secondary reference Caterpillar Inc Div Caterpillar Defense |
| 6I-4545 | C/1 Advisory reference — outside the item-of-supply concept Zf Industrieantriebe Witten Gmbh |
NSN 5331-01-351-2736 is a O-Ring, manufactured by Caterpillar Inc Div Caterpillar Defense, classified under FSC 5331, O-ring. Status: active.
NSN 5331-01-351-2736 has 4 manufacturer part numbers on file: 6I4545 (Caterpillar Inc Div Caterpillar Defense), 9Y6521 ITEM 2 (Caterpillar Inc Div Caterpillar Defense), 6I-4545 (Navantia Sa Sme. Div Navantia Hq), 6I-4545 (Navantia - Propulsion Y Energia Motores - Cartagena).
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.