The O-Ring, cataloged under National Stock Number 5331-00-931-6756, is classified within Federal Supply Class 5331 (O-Ring) of the Hardware and Abrasives group. The primary manufacturer of record is Leonardo Spa Aeronautics Division - Pomigliano D'arco Site. Government technical data includes 7 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 8 commercial cross-references from 8 manufacturers, enabling identification through both NSN and commercial part number lookups. 1 verified substitute exists in the FLIS interchangeability database. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5331-00-931-6756 |
| Primary Part Number | MS28778-3 |
| Item Name | O-Ring |
| FSC / FSG | 5331 / 53 — O-Ring |
| Manufacturer | Leonardo Spa Aeronautics Division - Pomigliano D'arco Site |
| Status | ACTIVE |
| Temp Rating | -65.0 FAHRENHEIT AND 160.0 FAHRENHEIT DEGF |
| Center Hole Diameter | 0.296 INCHES MINIMUM AND 0.306 INCHES MAXIMUM IN |
| Elongation Percentage | 80 MAXIMUM |
| Material | PLASTIC POLYTETRAFLUOROETHYLENE |
| Hardness Rating | 90.0 SHORE DUROMETER A NOMINAL |
| Cross-Sectional Height | 0.061 INCHES MINIMUM AND 0.067 INCHES MAXIMUM IN |
| Outside Diameter | 0.429 INCHES NOMINAL IN |
| Acquisition Status | ACTIVE |
| HAZMAT | No |
| Part Number | Manufacturer |
|---|---|
| MS28778-3 | Leonardo Spa Aeronautics Division - Pomigliano D'arco Site (ITA) |
| SP202D903 | Honeywell International Inc. Div Aerospace - Torrance (USA) |
| 5331PL0899171 | Jednolity Indeks Materialowy - Uniform Material Index (POL) |
| MS28778-3 | Military Standards Promulgated by Military Departments Under Authority of Defense Standardization Manual 4120 3-M |
| MS28778-3 | Sae International Dba Sae International (USA) |
| MS28778-3 | Society of Automotive Engineers Inc (USA) |
| MS28778-3ES | Eriks B.v. (NLD) |
| AS568A-903 | Clark Gasket Co., Inc. (USA) |
NSN 5331-00-931-6756 is a O-Ring, manufactured by Leonardo Spa Aeronautics Division - Pomigliano D'arco Site, classified under FSC 5331 (O-Ring). Status: active.
NSN 5331-00-931-6756 has 8 cross-referenced part numbers: MS28778-3 (Leonardo Spa Aeronautics Division - Pomigliano D'arco Site), SP202D903 (Honeywell International Inc. Div Aerospace - Torrance), 5331PL0899171 (Jednolity Indeks Materialowy - Uniform Material Index), MS28778-3 (Military Standards Promulgated by Military Departments Under Authority of Defense Standardization Manual 4120 3-M), MS28778-3 (Sae International Dba Sae International) and 3 more.
There is 1 known substitute for 5331-00-931-6756: 5331-00-835-7485. Verify interchangeability with system specifications before substitution.
Key specifications for MS28778-3: Temp Rating: -65.0 FAHRENHEIT AND 160.0 FAHRENHEIT DEGF; Center Hole Diameter: 0.296 INCHES MINIMUM AND 0.306 INCHES MAXIMUM IN; Elongation Percentage: 80 MAXIMUM; Material: PLASTIC POLYTETRAFLUOROETHYLENE. 7 total characteristics are documented in the Federal Logistics Information System.