The O-Ring, cataloged under National Stock Number 5331-01-412-4828, 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through both NSN and commercial part number lookups. 10 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5331-01-412-4828 |
| Primary Part Number | ST1946-904 |
| Item Name | O-Ring |
| FSC / FSG | 5331 / 53 — O-ring |
| Manufacturer | Rtx Corporation Div Pratt & Whitney |
| Status | ACTIVE |
| Cross-Sectional Height | 0.069 INCHES MINIMUM AND 0.075 INCHES MAXIMUM IN |
| Hardness Rating | 70.0 SHORE DUROMETER A MINIMUM AND 80.0 SHORE DUROMETER A MAXIMUM |
| Criticality Code Justification | FEAT |
| Material Document and Classification | MIL-R-83485 TYPE 1 MIL SPEC SINGLE MATERIAL RESPONSE |
| Center Hole Diameter | 0.346 INCHES MINIMUM AND 0.356 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 |
|---|---|
| ST1946-904 PRIMARY | Rtx Corporation Div Pratt & Whitney (USA) |
| ST1946-904 PRIMARY | Freudenberg-Nok General Partnership Dba International Seal Co Inc (USA) |
| ST1946-904 | Acushnet Rubber Company, Inc. Dba Precix (USA) |
| ST1946-904 | Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney (USA) |
| ST1946-904 PRIMARY | Parker-Hannifin Corp Div O-Ring Division (USA) |
| Reference | Meaning |
|---|---|
| AMC-R-83485 | 5/9 Secondary reference U.S. Government activity |
| 3-904 V0835-75 | 5/9 Secondary reference Parker-Hannifin Corp Div O-Ring Division |
| M83485/1-904 | 5/9 Secondary reference U.S. Government activity |
| 5331PL0658559 | 6/9 Informative reference only Jednolity Indeks Materialowy - Uniform Material Index |
| 5330PL2194124 | 6/9 Informative reference only Jednolity Indeks Materialowy - Uniform Material Index |
| M83485/1-904 | 5/9 Secondary reference U.S. Government activity |
| ST1051-04 | 5/9 Secondary reference Acushnet Rubber Company, Inc. Dba Precix |
| MIL-R-83485 | 5/9 Secondary reference U.S. Government activity |
| V0835 3-904 | 5/9 Secondary reference Parker-Hannifin Corp Div O-Ring Division |
| ST1051-04 | 5/9 Secondary reference Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney |
NSN 5331-01-412-4828 is a O-Ring, manufactured by Rtx Corporation Div Pratt & Whitney, classified under FSC 5331, O-ring. Status: active.
NSN 5331-01-412-4828 has 5 manufacturer part numbers on file: ST1946-904 (Rtx Corporation Div Pratt & Whitney), ST1946-904 (Freudenberg-Nok General Partnership Dba International Seal Co Inc), ST1946-904 (Acushnet Rubber Company, Inc. Dba Precix), ST1946-904 (Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney), ST1946-904 (Parker-Hannifin Corp Div O-Ring Division).
2 possible matches (shared part number, not a government interchangeability claim): 5331-01-464-8595, 5331-01-670-1690. Verify interchangeability with system specifications before substitution.
Key specifications for ST1946-904: Cross-Sectional Height: 0.069 INCHES MINIMUM AND 0.075 INCHES MAXIMUM IN; Hardness Rating: 70.0 SHORE DUROMETER A MINIMUM AND 80.0 SHORE DUROMETER A MAXIMUM; Criticality Code Justification: FEAT; Material Document and Classification: MIL-R-83485 TYPE 1 MIL SPEC 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.