The O-Ring, cataloged under National Stock Number 5331-01-412-0821, 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5 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government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 | 5331-01-412-0821 |
| Item Name | O-Ring |
| FSC / FSG | 5331 / 53 — O-ring |
| Status | ACTIVE |
| Cross-Sectional Height | 0.135 INCHES MINIMUM AND 0.143 INCHES MAXIMUM IN |
| Hardness Rating | 83.0 SHORE DUROMETER A MINIMUM AND 93.0 SHORE DUROMETER A MAXIMUM |
| Material Document and Classification | MIL-R-83412 TYPE 1 MIL SPEC SINGLE MATERIAL RESPONSE |
| Center Hole Diameter | 3.085 INCHES MINIMUM AND 3.133 INCHES MAXIMUM IN |
| Material | RUBBER ETHYLENE-PROPYLENE-DIENE CLASS EPDM |
| 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 |
|---|---|
| M83412/1-235 | 2/2 Government specification standardization U.S. Government activity |
| MIL-R-83412 | 4/1 Identification reference U.S. Government activity |
NSN 5331-01-412-0821 is a O-Ring, classified under FSC 5331, O-ring. Status: active.
2 possible matches (shared part number, not a government interchangeability claim): 5331-01-532-7685, 5331-01-532-7693. Verify interchangeability with system specifications before substitution.
Key specifications for 5331-01-412-0821: Cross-Sectional Height: 0.135 INCHES MINIMUM AND 0.143 INCHES MAXIMUM IN; Hardness Rating: 83.0 SHORE DUROMETER A MINIMUM AND 93.0 SHORE DUROMETER A MAXIMUM; Material Document and Classification: MIL-R-83412 TYPE 1 MIL SPEC SINGLE MATERIAL RESPONSE; Center Hole Diameter: 3.085 INCHES MINIMUM AND 3.133 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.