The O-Ring, cataloged under National Stock Number 5331-01-028-8981, is classified within Federal Supply Class 5331 (O-Ring) of the Hardware and Abrasives group. The primary manufacturer of record is Sae International Dba Sae International. Government technical data includes 6 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 8 commercial cross-references from 6 manufacturers, enabling identification through both NSN and commercial part number lookups. 12 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Cancelled.
| Parameter | Value |
|---|---|
| NSN | 5331-01-028-8981 |
| Primary Part Number | AS568-256 |
| Item Name | O-Ring |
| FSC / FSG | 5331 / 53 — O-Ring |
| Manufacturer | Sae International Dba Sae International |
| Status | CANCELLED |
| Temp Rating | -65.0 FAHRENHEIT AND 450.0 FAHRENHEIT DEGF |
| Material | RUBBER |
| Hardness Rating | 70.0 SHORE DUROMETER A NOMINAL |
| Cross-Sectional Height | 0.139 INCHES NOMINAL IN |
| Center Hole Diameter | 5.687 INCHES NOMINAL IN |
| Outside Diameter | 5.969 INCHES MINIMUM AND 6.055 INCHES MAXIMUM IN |
| Acquisition Status | CANCELLED |
| HAZMAT | No |
| Part Number | Manufacturer |
|---|---|
| AS568-256 | Society of Automotive Engineers Inc (USA) |
| 5331PL0755715 | Jednolity Indeks Materialowy - Uniform Material Index (POL) |
| AS568-256 PRIMARY | Sae International Dba Sae International (USA) |
| 604-7 | Parker-Hannifin Corp Div O-Ring Division (USA) |
| 2-256 | Parker-Hannifin Corp Div O-Ring Division (USA) |
| 11614198-2 | U S Army Tank Automotive Command Amsta-Im-Mm (USA) |
| 2-256 | Zf Industrieantriebe Witten Gmbh (DEU) |
| 2-256-S604-70 | Parker-Hannifin Corp Div O-Ring Division (USA) |
NSN 5331-01-028-8981 is a O-Ring, manufactured by Sae International Dba Sae International, classified under FSC 5331 (O-Ring). Status: cancelled.
NSN 5331-01-028-8981 has 8 cross-referenced part numbers: AS568-256 (Society of Automotive Engineers Inc), 5331PL0755715 (Jednolity Indeks Materialowy - Uniform Material Index), AS568-256 (Sae International Dba Sae International), 604-7 (Parker-Hannifin Corp Div O-Ring Division), 2-256 (Parker-Hannifin Corp Div O-Ring Division) and 3 more.
There are 12 known substitutes for 5331-01-028-8981: 5935-00-068-6510, 5331-00-199-1644, 9540-00-287-9426 and 9 more. Verify interchangeability with system specifications before substitution.
Key specifications for AS568-256: Temp Rating: -65.0 FAHRENHEIT AND 450.0 FAHRENHEIT DEGF; Material: RUBBER; Hardness Rating: 70.0 SHORE DUROMETER A NOMINAL; Cross-Sectional Height: 0.139 INCHES NOMINAL IN. 6 total characteristics are documented in the Federal Logistics Information System.
NSN 5331-01-028-8981 is currently cancelled. Check with the Defense Logistics Agency for current availability and authorized substitutes.