The O-Ring, cataloged under National Stock Number 5331-01-388-2909, is classified within Federal Supply Class 5331 (O-ring) of the Hardware and Abrasives group. The manufacturer of record is Rafael. 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5331-01-388-2909 |
| Primary Part Number | 5-944N304-75 |
| Item Name | O-Ring |
| FSC / FSG | 5331 / 53 — O-ring |
| Manufacturer | Rafael |
| Status | ACTIVE |
| Temp Rating | -65.0 FAHRENHEIT AND 225.0 FAHRENHEIT DEGF |
| Cross-Sectional Height | 0.135 INCHES MINIMUM AND 0.143 INCHES MAXIMUM IN |
| Hardness Rating | 75.0 SHORE DUROMETER A NOMINAL |
| Elongation Percentage | 164 MAXIMUM |
| Center Hole Diameter | 18.780 INCHES MINIMUM AND 18.980 INCHES MAXIMUM IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL B — Remove Demilitarization Key Points |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 5-944N304-75 PRIMARY | Rafael (ISR) |
| 408270089 | Rafael (ISR) |
| Reference | Meaning |
|---|---|
| 5-944N304-75 | 3/9 Design control — primary reference Rafael |
NSN 5331-01-388-2909 is a O-Ring, manufactured by Rafael, classified under FSC 5331, O-ring. Status: active.
NSN 5331-01-388-2909 has 2 manufacturer part numbers on file: 5-944N304-75 (Rafael), 408270089 (Rafael).
Key specifications for 5-944N304-75: Temp Rating: -65.0 FAHRENHEIT AND 225.0 FAHRENHEIT DEGF; Cross-Sectional Height: 0.135 INCHES MINIMUM AND 0.143 INCHES MAXIMUM IN; Hardness Rating: 75.0 SHORE DUROMETER A NOMINAL; Elongation Percentage: 164 MAXIMUM. 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.
NSN 5331-01-388-2909 has DEMIL Code B. Demilitarization may be required before disposal or transfer to non-military entities.
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.