The O-Ring, cataloged under National Stock Number 5331-01-288-3163, is classified within Federal Supply Class 5331 (O-ring) of the Hardware and Abrasives group. The manufacturer of record is American Propulation Systems. The record lists 2 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | American Propulation Systems (CAGE 3P473); Sternpowr Marine Drives Ltd (CAGE U2917) |
| Parameter | Value |
|---|---|
| NSN | 5331-01-288-3163 |
| Primary Part Number | 15.M.4 |
| Item Name | O-Ring |
| FSC / FSG | 5331 / 53 — O-ring |
| Manufacturer | American Propulation Systems |
| 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 |
|---|---|
| 15.M.4 PRIMARY | American Propulation Systems (USA) |
| 15.M.4 | Sternpowr Marine Drives Ltd (GBR) |
| Reference | Meaning |
|---|---|
| 5331PL0837850 | 6/9 Informative reference only Jednolity Indeks Materialowy - Uniform Material Index |
| 15-M-4 | C/1 Advisory reference — outside the item-of-supply concept Zf Industrieantriebe Witten Gmbh |
NSN 5331-01-288-3163 is a O-Ring, manufactured by American Propulation Systems, classified under FSC 5331, O-ring. Status: active.
NSN 5331-01-288-3163 has 2 manufacturer part numbers on file: 15.M.4 (American Propulation Systems), 15.M.4 (Sternpowr Marine Drives Ltd).
1 possible match (shared part number, not a government interchangeability claim): 1560-01-521-1477. 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.