The O-Ring, cataloged under National Stock Number 5331-00-166-8401, is classified within Federal Supply Class 5331 (O-ring) of the Hardware and Abrasives group. The manufacturer of record is Cfm International Inc Dba Cfm International. Government technical data includes 7 specifications, cited from the U.S. Government catalog. The record lists 8 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 9 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government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: Cancelled.
| Parameter | Value |
|---|---|
| NSN | 5331-00-166-8401 |
| Primary Part Number | 649-393-156-0 |
| Item Name | O-Ring |
| FSC / FSG | 5331 / 53 — O-ring |
| Manufacturer | Cfm International Inc Dba Cfm International |
| Status | CANCELLED |
| Temp Rating | -15.0 FAHRENHEIT AND 400.0 FAHRENHEIT DEGF |
| Cross-Sectional Height | 0.100 INCHES MINIMUM AND 0.106 INCHES MAXIMUM IN |
| Outside Diameter | 4.407 INCHES MINIMUM AND 4.479 INCHES MAXIMUM IN |
| Hardness Rating | 75.0 SHORE DUROMETER A NOMINAL |
| Elongation Percentage | 125 MAXIMUM |
| Center Hole Diameter | 4.207 INCHES MINIMUM AND 4.267 INCHES MAXIMUM IN |
| Material | RUBBER FLUOROCARBON CLASS FPM |
| Acquisition Status | CANCELLED |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 153-015-10 | March Manufacturing, Inc (USA) |
| 649-393-156-0 PRIMARY | Cfm International Inc Dba Cfm International (USA) |
| 2-156V1226-75 PRIMARY | Parker-Hannifin Corp Div O-Ring Division (USA) |
| 2-156V1164-75 PRIMARY | Parker-Hannifin Corp Div O-Ring Division (USA) |
| J221P156 | General Electric Company (USA) |
| 0153-0015-1000 | March Manufacturing, Inc (USA) |
| 2-156V0747-75 PRIMARY | Parker-Hannifin Corp Div O-Ring Division (USA) |
| 649-393-156-0 | Safran Aircraft Engines (FRA) |
| Reference | Meaning |
|---|---|
| 5331001668401 | 6/9 Informative reference only E.c.a Etablissement Central Des Approvisionnements Des Forces Armees Royales |
| 2-156V747-75 | 5/9 Secondary reference Parker-Hannifin Corp Div O-Ring Division |
| M83248/1-156 | 5/9 Secondary reference U.S. Government activity |
| 5331PL2228015 | 6/9 Informative reference only Jednolity Indeks Materialowy - Uniform Material Index |
| MILR83248 | 5/9 Secondary reference U.S. Government activity |
| MS9388-156 | 5/9 Secondary reference U.S. Government activity |
| S9413-156 | 3/2 Design control — primary reference U.S. Government activity |
| SAE-AMS7276 | 3/1 Design control — primary reference Sae International Dba Sae International |
| 2-156V884-75 | 5/9 Secondary reference Parker-Hannifin Corp Div O-Ring Division |
NSN 5331-00-166-8401 is a O-Ring, manufactured by Cfm International Inc Dba Cfm International, classified under FSC 5331, O-ring. Status: cancelled.
NSN 5331-00-166-8401 has 8 manufacturer part numbers on file: 153-015-10 (March Manufacturing, Inc), 649-393-156-0 (Cfm International Inc Dba Cfm International), 2-156V1226-75 (Parker-Hannifin Corp Div O-Ring Division), 2-156V1164-75 (Parker-Hannifin Corp Div O-Ring Division), J221P156 (General Electric Company) and 3 more.
2 possible matches (shared part number, not a government interchangeability claim): 5330-01-283-5679, 5999-01-449-6706. Verify interchangeability with system specifications before substitution.
Key specifications for 649-393-156-0: Temp Rating: -15.0 FAHRENHEIT AND 400.0 FAHRENHEIT DEGF; Cross-Sectional Height: 0.100 INCHES MINIMUM AND 0.106 INCHES MAXIMUM IN; Outside Diameter: 4.407 INCHES MINIMUM AND 4.479 INCHES MAXIMUM IN; Hardness Rating: 75.0 SHORE DUROMETER A NOMINAL. 7 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.
NSN 5331-00-166-8401 is currently cancelled. Check with the Defense Logistics Agency for current availability and authorized substitutes.
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.