The O-Ring, cataloged under National Stock Number 5331-01-501-3064, 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 6 specifications, cited from the U.S. Government catalog. The record lists 5 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5331-01-501-3064 |
| Primary Part Number | ST1946-256 |
| Item Name | O-Ring |
| FSC / FSG | 5331 / 53 — O-ring |
| Manufacturer | Rtx Corporation Div Pratt & Whitney |
| Status | ACTIVE |
| Temp Rating | -40.0 FAHRENHEIT AND 400.0 FAHRENHEIT DEGF |
| Cross-Sectional Height | 0.135 INCHES MINIMUM AND 0.143 INCHES MAXIMUM IN |
| Hardness Rating | 70.0 SHORE DUROMETER A MINIMUM AND 80.0 SHORE DUROMETER A MAXIMUM |
| Material Document and Classification | AMS-R-83485 ASSN STD SINGLE MATERIAL RESPONSE |
| Center Hole Diameter | 5.699 INCHES MINIMUM AND 5.769 INCHES MAXIMUM IN |
| Material | RUBBER FLUOROCARBON CLASS FPM |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | F |
| Part Number | Manufacturer |
|---|---|
| ST1946-256 PRIMARY | Rtx Corporation Div Pratt & Whitney (USA) |
| ST1946-256 PRIMARY | Acushnet Rubber Company, Inc. Dba Precix (USA) |
| ST1946-256 PRIMARY | Freudenberg-Nok General Partnership Dba International Seal Co Inc (USA) |
| ST1946-256 PRIMARY | Parker-Hannifin Corp Div O-Ring Division (USA) |
| ST1946-256 | Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney (USA) |
| Reference | Meaning |
|---|---|
| V0835 2-256 | 5/9 Secondary reference Parker-Hannifin Corp Div O-Ring Division |
| 2-256 V0835-75 | 5/9 Secondary reference Parker-Hannifin Corp Div O-Ring Division |
| 5331PL0848138 | 6/9 Informative reference only Jednolity Indeks Materialowy - Uniform Material Index |
NSN 5331-01-501-3064 is a O-Ring, manufactured by Rtx Corporation Div Pratt & Whitney, classified under FSC 5331, O-ring. Status: active.
NSN 5331-01-501-3064 has 5 manufacturer part numbers on file: ST1946-256 (Rtx Corporation Div Pratt & Whitney), ST1946-256 (Acushnet Rubber Company, Inc. Dba Precix), ST1946-256 (Freudenberg-Nok General Partnership Dba International Seal Co Inc), ST1946-256 (Parker-Hannifin Corp Div O-Ring Division), ST1946-256 (Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney).
Key specifications for ST1946-256: Temp Rating: -40.0 FAHRENHEIT AND 400.0 FAHRENHEIT DEGF; Cross-Sectional Height: 0.135 INCHES MINIMUM AND 0.143 INCHES MAXIMUM IN; Hardness Rating: 70.0 SHORE DUROMETER A MINIMUM AND 80.0 SHORE DUROMETER A MAXIMUM; Material Document and Classification: AMS-R-83485 ASSN STD SINGLE MATERIAL RESPONSE. 6 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.