The O-Ring, cataloged under National Stock Number 5331-00-931-6751, is classified within Federal Supply Class 5331 (O-Ring) of the Hardware and Abrasives group. The primary manufacturer of record is Military Standards Promulgated by Military Departments Under Authority of Defense Standardization Manual 4120 3-M. Government technical data includes 7 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 3 commercial cross-references from 3 manufacturers, enabling identification through both NSN and commercial part number lookups. 4 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5331-00-931-6751 |
| Primary Part Number | MS28778-20 |
| Item Name | O-Ring |
| FSC / FSG | 5331 / 53 — O-Ring |
| Manufacturer | Military Standards Promulgated by Military Departments Under Authority of Defense Standardization Manual 4120 3-M |
| Status | ACTIVE |
| Elongation Percentage | 80 MAXIMUM |
| Material | PLASTIC POLYTETRAFLUOROETHYLENE |
| Center Hole Diameter | 1.465 INCHES MINIMUM AND 1.485 INCHES MAXIMUM IN |
| Temp Rating | -65.0 FAHRENHEIT AND 160.0 FAHRENHEIT DEGF |
| Hardness Rating | 90.0 SHORE DUROMETER A NOMINAL |
| Outside Diameter | 1.711 INCHES NOMINAL IN |
| Cross-Sectional Height | 0.114 INCHES MINIMUM AND 0.122 INCHES MAXIMUM IN |
| Acquisition Status | ACTIVE |
| HAZMAT | No |
| Part Number | Manufacturer |
|---|---|
| MS28778-20 | Military Standards Promulgated by Military Departments Under Authority of Defense Standardization Manual 4120 3-M |
| MS28778-20 | Society of Automotive Engineers Inc (USA) |
| MS28778-20 | Sae International Dba Sae International (USA) |
NSN 5331-00-931-6751 is a O-Ring, manufactured by Military Standards Promulgated by Military Departments Under Authority of Defense Standardization Manual 4120 3-M, classified under FSC 5331 (O-Ring). Status: active.
NSN 5331-00-931-6751 has 3 cross-referenced part numbers: MS28778-20 (Military Standards Promulgated by Military Departments Under Authority of Defense Standardization Manual 4120 3-M), MS28778-20 (Society of Automotive Engineers Inc), MS28778-20 (Sae International Dba Sae International).
There are 4 known substitutes for 5331-00-931-6751: 5331-00-803-7208, 5331-00-816-3546, 5330-00-922-5947 and 1 more. Verify interchangeability with system specifications before substitution.
Key specifications for MS28778-20: Elongation Percentage: 80 MAXIMUM; Material: PLASTIC POLYTETRAFLUOROETHYLENE; Center Hole Diameter: 1.465 INCHES MINIMUM AND 1.485 INCHES MAXIMUM IN; Temp Rating: -65.0 FAHRENHEIT AND 160.0 FAHRENHEIT DEGF. 7 total characteristics are documented in the Federal Logistics Information System.