The O-Ring, cataloged under National Stock Number 5331-00-974-6643, is classified within Federal Supply Class 5331 (O-ring) of the Hardware and Abrasives group. The manufacturer of record is Stanadyne Corporation Dba Stanadyne Diesel Systems. Government technical data includes 3 specifications, cited from the U.S. Government catalog. 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government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 | 5331-00-974-6643 |
| Primary Part Number | 12764 |
| Item Name | O-Ring |
| FSC / FSG | 5331 / 53 — O-ring |
| Manufacturer | Stanadyne Corporation Dba Stanadyne Diesel Systems |
| Status | ACTIVE |
| Cross-Sectional Height | 0.067 INCHES MINIMUM AND 0.073 INCHES MAXIMUM IN |
| Center Hole Diameter | 0.795 INCHES MINIMUM AND 0.807 INCHES MAXIMUM IN |
| Material | RUBBER SYNTHETIC |
| 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 |
|---|---|
| 12764 | Stanadyne Corporation Dba Stanadyne Diesel Systems (USA) |
| D40331 | Cnh Industrial America Llc Dba Cnh America (USA) |
| Reference | Meaning |
|---|---|
| 12764 | 3/2 Design control — primary reference U.S. Government activity |
| P92346 | 5/9 Secondary reference Laneko Engineering Co |
NSN 5331-00-974-6643 is a O-Ring, manufactured by Stanadyne Corporation Dba Stanadyne Diesel Systems, classified under FSC 5331, O-ring. Status: active.
NSN 5331-00-974-6643 has 2 manufacturer part numbers on file: 12764 (Stanadyne Corporation Dba Stanadyne Diesel Systems), D40331 (Cnh Industrial America Llc Dba Cnh America).
2 possible matches (shared part number, not a government interchangeability claim): 5340-01-645-0441, 1005-01-675-9487. Verify interchangeability with system specifications before substitution.
Key specifications for 12764: Cross-Sectional Height: 0.067 INCHES MINIMUM AND 0.073 INCHES MAXIMUM IN; Center Hole Diameter: 0.795 INCHES MINIMUM AND 0.807 INCHES MAXIMUM IN; Material: RUBBER SYNTHETIC. 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.