The O-Ring, cataloged under National Stock Number 5331-01-643-0502, is classified within Federal Supply Class 5331 (O-ring) of the Hardware and Abrasives group. The manufacturer of record is Emerson Automation Solutions Final Control Us Lp Dba Marine Product Team Div Marine Product Team. 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5331-01-643-0502 |
| Primary Part Number | 08664 |
| Item Name | O-Ring |
| FSC / FSG | 5331 / 53 — O-ring |
| Manufacturer | Emerson Automation Solutions Final Control Us Lp Dba Marine Product Team Div Marine Product Team |
| Status | ACTIVE |
| 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 |
|---|---|
| 08664 PRIMARY | Emerson Automation Solutions Final Control Us Lp Dba Marine Product Team Div Marine Product Team (USA) |
| Reference | Meaning |
|---|---|
| 8361PC8664 | C/1 Advisory reference — outside the item-of-supply concept Emerson Automation Solutions Final Control Us Lp Dba Marine Product Team Div Marine Product Team |
NSN 5331-01-643-0502 is a O-Ring, manufactured by Emerson Automation Solutions Final Control Us Lp Dba Marine Product Team Div Marine Product Team, classified under FSC 5331, O-ring. Status: active.
NSN 5331-01-643-0502 has 1 manufacturer part number on file: 08664 (Emerson Automation Solutions Final Control Us Lp Dba Marine Product Team Div Marine Product Team).
2 possible matches (shared part number, not a government interchangeability claim): 5998-01-688-1437, 5670-01-735-8294. Verify interchangeability with system specifications before substitution.
Key specifications for 08664: End Item Identification: VALVE ASSEMBLY,REGULATING. 0 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.