The O-Ring, cataloged under National Stock Number 5331-00-728-2272, is classified within Federal Supply Class 5331 (O-ring) of the Hardware and Abrasives group. The manufacturer of record is Rtx Corporation Div Pratt & Whitney. Government technical data includes 3 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5331-00-728-2272 |
| Primary Part Number | 571011 |
| Item Name | O-Ring |
| FSC / FSG | 5331 / 53 — O-ring |
| Manufacturer | Rtx Corporation Div Pratt & Whitney |
| Status | ACTIVE |
| Cross-Sectional Height | 0.112 INCHES MINIMUM AND 0.120 INCHES MAXIMUM IN |
| Center Hole Diameter | 0.918 INCHES MINIMUM AND 0.930 INCHES MAXIMUM IN |
| Material | RUBBER SYNTHETIC |
| 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 |
|---|---|
| 571011 | Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney (USA) |
| 571011 PRIMARY | Rtx Corporation Div Pratt & Whitney (USA) |
| Reference | Meaning |
|---|---|
| 571011 | 5/9 Secondary reference Micron Machine Corp |
| 571011 | 5/9 Secondary reference Tokyo Judogi Kogyo Co. |
| 571011 | 5/9 Secondary reference Richmond Lox Equipment Co Sub of Richmond Tank Car Co |
NSN 5331-00-728-2272 is a O-Ring, manufactured by Rtx Corporation Div Pratt & Whitney, classified under FSC 5331, O-ring. Status: active.
NSN 5331-00-728-2272 has 2 manufacturer part numbers on file: 571011 (Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney), 571011 (Rtx Corporation Div Pratt & Whitney).
1 possible match (shared part number, not a government interchangeability claim): 5340-01-334-3423. Verify interchangeability with system specifications before substitution.
Key specifications for 571011: Cross-Sectional Height: 0.112 INCHES MINIMUM AND 0.120 INCHES MAXIMUM IN; Center Hole Diameter: 0.918 INCHES MINIMUM AND 0.930 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.
NSN 5331-00-728-2272 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.