The O-Ring, cataloged under National Stock Number 5331-01-497-3960, is classified within Federal Supply Class 5331 (O-ring) of the Hardware and Abrasives group. The manufacturer of record is Rolls Royce Corp. Government technical data includes 4 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. 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 | 5331-01-497-3960 |
| Primary Part Number | MS9966-04 |
| Item Name | O-Ring |
| FSC / FSG | 5331 / 53 — O-ring |
| Manufacturer | Rolls Royce Corp |
| Status | ACTIVE |
| Cross-Sectional Height | 0.069 INCHES MINIMUM AND 0.075 INCHES MAXIMUM IN |
| Criticality Code Justification | AGAV |
| Center Hole Diameter | 0.346 INCHES MINIMUM AND 0.356 INCHES MAXIMUM IN |
| Material | RUBBER FLUOROSILICONE CLASS FQ |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | Y |
| Part Number | Manufacturer |
|---|---|
| MS9966-04 PRIMARY | Rolls Royce Corp (USA) |
NSN 5331-01-497-3960 is a O-Ring, manufactured by Rolls Royce Corp, classified under FSC 5331, O-ring. Status: active.
NSN 5331-01-497-3960 has 1 manufacturer part number on file: MS9966-04 (Rolls Royce Corp).
1 possible match (shared part number, not a government interchangeability claim): 5331-01-669-5397. Verify interchangeability with system specifications before substitution.
Key specifications for MS9966-04: Cross-Sectional Height: 0.069 INCHES MINIMUM AND 0.075 INCHES MAXIMUM IN; Criticality Code Justification: AGAV; Special Features: CONTRACTOR SUPPORTED ITEM;ROLLS-ROYCE AE2100D3 TURBOSHAFT ENGINE; Center Hole Diameter: 0.346 INCHES MINIMUM AND 0.356 INCHES MAXIMUM IN. 4 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.