The O-Ring, cataloged under National Stock Number 5331-01-618-8443, 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 4 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5331-01-618-8443 |
| Primary Part Number | E0740 2-237 |
| Item Name | O-Ring |
| FSC / FSG | 5331 / 53 — O-ring |
| Manufacturer | Parker-Hannifin Corp Div O-Ring Division |
| Status | ACTIVE |
| Cross-Sectional Height | 0.1875 INCHES NOMINAL IN |
| Outside Diameter | 3.375 INCHES NOMINAL IN |
| Specification/standard Data | AS-568A NATIONAL STD/SPEC A |
| Center Hole Diameter | 3.000 INCHES NOMINAL IN |
| 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 |
|---|---|
| E0740 2-237 PRIMARY | Parker-Hannifin Corp Div O-Ring Division (USA) |
| Reference | Meaning |
|---|---|
| 2-337 EB153-75 | 3/9 Design control — primary reference Parker-Hannifin Corp Div O-Ring Division |
NSN 5331-01-618-8443 is a O-Ring, manufactured by Parker-Hannifin Corp Div O-Ring Division, classified under FSC 5331, O-ring. Status: active.
NSN 5331-01-618-8443 has 1 manufacturer part number on file: E0740 2-237 (Parker-Hannifin Corp Div O-Ring Division).
Key specifications for E0740 2-237: Cross-Sectional Height: 0.1875 INCHES NOMINAL IN; Outside Diameter: 3.375 INCHES NOMINAL IN; Specification/standard Data: AS-568A NATIONAL STD/SPEC A; Special Features: VOLUME CUBIC INCH 0.3466;METRIC SIZE INSIDE DIAMETER 74.96, WIDE 76.18. 4 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.