The O-Ring, cataloged under National Stock Number 5331-01-643-6405, is classified within Federal Supply Class 5331 (O-ring) of the Hardware and Abrasives group. Government technical data includes 5 specifications, cited from the U.S. Government catalog. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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.
| Parameter | Value |
|---|---|
| NSN | 5331-01-643-6405 |
| Item Name | O-Ring |
| FSC / FSG | 5331 / 53 — O-ring |
| Status | ACTIVE |
| Cross-Sectional Height | 0.067 INCHES MINIMUM IN |
| Hardness Rating | 90.0 SHORE DUROMETER A NOMINAL |
| Elongation Percentage | 125 MAXIMUM |
| Center Hole Diameter | 0.369 INCHES MAXIMUM IN |
| Material | RUBBER FLUOROCARBON CLASS FPM |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| M83248/2-906 | 5/9 Secondary reference U.S. Government activity |
| 563-7286781-62 | 5/1 Secondary reference Naval Sea Systems Command |
| MIL-R-83248/2 | 4/1 Identification reference U.S. Government activity |
NSN 5331-01-643-6405 is a O-Ring, classified under FSC 5331, O-ring. Status: active.
1 possible match (shared part number, not a government interchangeability claim): 5331-01-664-3935. Verify interchangeability with system specifications before substitution.
Key specifications for 5331-01-643-6405: Cross-Sectional Height: 0.067 INCHES MINIMUM IN; Hardness Rating: 90.0 SHORE DUROMETER A NOMINAL; Elongation Percentage: 125 MAXIMUM; Center Hole Diameter: 0.369 INCHES MAXIMUM IN. 5 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.