The O-Ring, cataloged under National Stock Number 5331-00-852-1578, is classified within Federal Supply Class 5331 (O-ring) of the Hardware and Abrasives group. The manufacturer of record is Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney. Government technical data includes 3 specifications, cited from the U.S. Government catalog. The record lists 3 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 5331-00-852-1578 |
| Primary Part Number | 444991 |
| Item Name | O-Ring |
| FSC / FSG | 5331 / 53 — O-ring |
| Manufacturer | Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney |
| Status | ACTIVE |
| Cross-Sectional Height | 0.205 INCHES MINIMUM AND 0.215 INCHES MAXIMUM IN |
| Center Hole Diameter | 1.165 INCHES MINIMUM AND 1.175 INCHES MAXIMUM IN |
| Material | RUBBER SYNTHETIC |
| 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 |
|---|---|
| 444991 PRIMARY | Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney (USA) |
| 444991 | Parker-Hannifin Corp Div O-Ring Division (USA) |
| 444991 | Lord Corporation Dba Lord Corp (USA) |
| Reference | Meaning |
|---|---|
| 444991 | 5/9 Secondary reference Turbo Power & Marine System Inc Sub of United Technologies Corp |
NSN 5331-00-852-1578 is a O-Ring, manufactured by Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney, classified under FSC 5331, O-ring. Status: active.
NSN 5331-00-852-1578 has 3 manufacturer part numbers on file: 444991 (Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney), 444991 (Parker-Hannifin Corp Div O-Ring Division), 444991 (Lord Corporation Dba Lord Corp).
Key specifications for 444991: Cross-Sectional Height: 0.205 INCHES MINIMUM AND 0.215 INCHES MAXIMUM IN; Center Hole Diameter: 1.165 INCHES MINIMUM AND 1.175 INCHES MAXIMUM IN; Material: RUBBER SYNTHETIC. 3 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.