The O-Ring, cataloged under National Stock Number 5331-00-004-3179, is classified within Federal Supply Class 5331 (O-ring) of the Hardware and Abrasives group. The manufacturer of record is Watts Automatic Control Valve Inc. Government technical data includes 3 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government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 | 5331-00-004-3179 |
| Primary Part Number | 012-328 |
| Item Name | O-Ring |
| FSC / FSG | 5331 / 53 — O-ring |
| Manufacturer | Watts Automatic Control Valve Inc |
| Status | ACTIVE |
| Cross-Sectional Height | 0.205 INCHES MINIMUM AND 0.215 INCHES MAXIMUM IN |
| Center Hole Diameter | 1.840 INCHES MINIMUM AND 1.860 INCHES MAXIMUM IN |
| Material | RUBBER ETHYLENE-PROPYLENE CLASS EPM |
| 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 |
|---|---|
| 012-328 PRIMARY | Watts Automatic Control Valve Inc (USA) |
| Reference | Meaning |
|---|---|
| 10012-328 | 5/9 Secondary reference Muesco Inc Dba Muesco Mallay Inc |
| 10012-328 | 5/9 Secondary reference Watts Automatic Control Valve Inc |
NSN 5331-00-004-3179 is a O-Ring, manufactured by Watts Automatic Control Valve Inc, classified under FSC 5331, O-ring. Status: active.
NSN 5331-00-004-3179 has 1 manufacturer part number on file: 012-328 (Watts Automatic Control Valve Inc).
2 possible matches (shared part number, not a government interchangeability claim): 5985-01-598-7905, 5340-01-625-0125. Verify interchangeability with system specifications before substitution.
Key specifications for 012-328: Cross-Sectional Height: 0.205 INCHES MINIMUM AND 0.215 INCHES MAXIMUM IN; Center Hole Diameter: 1.840 INCHES MINIMUM AND 1.860 INCHES MAXIMUM IN; Material: RUBBER ETHYLENE-PROPYLENE CLASS EPM. 3 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.