The O-Ring, cataloged under National Stock Number 5331-01-477-7364, is classified within Federal Supply Class 5331 (O-ring) of the Hardware and Abrasives group. The manufacturer of record is Leonardo Spa Helicopters Division - Production Site. 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5331-01-477-7364 |
| Primary Part Number | M83485/1-139 |
| Item Name | O-Ring |
| FSC / FSG | 5331 / 53 — O-ring |
| Manufacturer | Leonardo Spa Helicopters Division - Production Site |
| Status | ACTIVE |
| Cross-Sectional Height | 2.375 INCHES NOMINAL IN |
| Center Hole Diameter | 2.187 INCHES NOMINAL 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 |
|---|---|
| M83485/1-139 | Leonardo Spa Helicopters Division - Production Site (ITA) |
| M83485/1-139 | Sae International Dba Sae International (USA) |
| Reference | Meaning |
|---|---|
| M83485/1-139 | 5/9 Secondary reference U.S. Government activity |
| M83485/1-139 | 2/2 Government specification standardization U.S. Government activity |
NSN 5331-01-477-7364 is a O-Ring, manufactured by Leonardo Spa Helicopters Division - Production Site, classified under FSC 5331, O-ring. Status: active.
NSN 5331-01-477-7364 has 2 manufacturer part numbers on file: M83485/1-139 (Leonardo Spa Helicopters Division - Production Site), M83485/1-139 (Sae International Dba Sae International).
Key specifications for M83485/1-139: Cross-Sectional Height: 2.375 INCHES NOMINAL IN; Special Features: THICKNESS IS 2.175 INCH IN; Center Hole Diameter: 2.187 INCHES NOMINAL 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.