The O-Ring, cataloged under National Stock Number 5331-00-531-7451, is classified within Federal Supply Class 5331 (O-ring) of the Hardware and Abrasives group. The manufacturer of record is Parker-Hannifin Corp Div O-Ring Division. Government technical data includes 5 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5331-00-531-7451 |
| Primary Part Number | 2-168N304-75 |
| Item Name | O-Ring |
| FSC / FSG | 5331 / 53 — O-ring |
| Manufacturer | Parker-Hannifin Corp Div O-Ring Division |
| Status | ACTIVE |
| Cross-Sectional Height | 0.100 INCHES MINIMUM AND 0.106 INCHES MAXIMUM IN |
| Outside Diameter | 7.392 INCHES MINIMUM AND 7.494 INCHES MAXIMUM IN |
| Hardness Rating | 75.0 SHORE DUROMETER A NOMINAL |
| Center Hole Diameter | 7.207 INCHES MINIMUM AND 7.267 INCHES MAXIMUM IN |
| Material | RUBBER BUTADIENE-ACRYLONITRILE CLASS NBR |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 2-168N304-75 PRIMARY | Parker-Hannifin Corp Div O-Ring Division (USA) |
| ARP568-168MILP25732 | Sae International Dba Sae International (USA) |
| Reference | Meaning |
|---|---|
| ARP568-168MILP25732 | 5/9 Secondary reference U.S. Government activity |
| ARP568-168 | C/1 Advisory reference — outside the item-of-supply concept Zf Industrieantriebe Witten Gmbh |
| 2-168N304-75 | 5/9 Secondary reference U.S. Government activity |
| 2-168N304-7 | C/1 Advisory reference — outside the item-of-supply concept U.S. Government activity |
| 68-743 | 5/9 Secondary reference U.S. Government activity |
NSN 5331-00-531-7451 is a O-Ring, manufactured by Parker-Hannifin Corp Div O-Ring Division, classified under FSC 5331, O-ring. Status: active.
NSN 5331-00-531-7451 has 2 manufacturer part numbers on file: 2-168N304-75 (Parker-Hannifin Corp Div O-Ring Division), ARP568-168MILP25732 (Sae International Dba Sae International).
Key specifications for 2-168N304-75: Cross-Sectional Height: 0.100 INCHES MINIMUM AND 0.106 INCHES MAXIMUM IN; Outside Diameter: 7.392 INCHES MINIMUM AND 7.494 INCHES MAXIMUM IN; Hardness Rating: 75.0 SHORE DUROMETER A NOMINAL; Center Hole Diameter: 7.207 INCHES MINIMUM AND 7.267 INCHES MAXIMUM IN. 5 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.