The O-Ring, cataloged under National Stock Number 5331-00-405-0820, is classified within Federal Supply Class 5331 (O-ring) of the Hardware and Abrasives group. The manufacturer of record is Mine Safety Appliances Company. 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. 3 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 | 5331-00-405-0820 |
| Primary Part Number | 68542 |
| Item Name | O-Ring |
| FSC / FSG | 5331 / 53 — O-ring |
| Manufacturer | Mine Safety Appliances Company |
| Status | ACTIVE |
| Cross-Sectional Height | 0.084 INCHES MINIMUM AND 0.090 INCHES MAXIMUM IN |
| Center Hole Diameter | 0.465 INCHES MINIMUM AND 0.475 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 |
| Part Number | Manufacturer |
|---|---|
| 68542 PRIMARY | Mine Safety Appliances Company (USA) |
NSN 5331-00-405-0820 is a O-Ring, manufactured by Mine Safety Appliances Company, classified under FSC 5331, O-ring. Status: active.
NSN 5331-00-405-0820 has 1 manufacturer part number on file: 68542 (Mine Safety Appliances Company).
3 possible matches (shared part number, not a government interchangeability claim): 5360-00-505-9119, 9320-00-935-9196, 6680-01-172-6108. Verify interchangeability with system specifications before substitution.
Key specifications for 68542: Cross-Sectional Height: 0.084 INCHES MINIMUM AND 0.090 INCHES MAXIMUM IN; Center Hole Diameter: 0.465 INCHES MINIMUM AND 0.475 INCHES MAXIMUM IN; Material: RUBBER FLUOROCARBON CLASS FPM. 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.