The O-Ring, cataloged under National Stock Number 5331-01-485-6438, 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 5 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 5331-01-485-6438 |
| Primary Part Number | ST1946-163 |
| Item Name | O-Ring |
| FSC / FSG | 5331 / 53 — O-ring |
| Manufacturer | Rtx Corporation Div Pratt & Whitney |
| Status | ACTIVE |
| Cross-Sectional Height | 0.100 INCHES MINIMUM AND 0.106 INCHES MAXIMUM IN |
| Hardness Rating | 70.0 SHORE DUROMETER A MINIMUM AND 80.0 SHORE DUROMETER A MAXIMUM |
| Material Document and Classification | MIL-R-83451/1 MIL SPEC SINGLE MATERIAL RESPONSE |
| Center Hole Diameter | 5.952 INCHES MINIMUM AND 6.022 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 |
|---|---|
| ST1946-163 PRIMARY | Rtx Corporation Div Pratt & Whitney (USA) |
| ST1946-163 PRIMARY | Parker-Hannifin Corp Div O-Ring Division (USA) |
| ST1946-163 PRIMARY | Acushnet Rubber Company, Inc. Dba Precix (USA) |
| ST1946-163 | Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney (USA) |
| ST1946-163 PRIMARY | Freudenberg-Nok General Partnership Dba International Seal Co Inc (USA) |
| Reference | Meaning |
|---|---|
| 5331PL0658572 | 6/9 Informative reference only Jednolity Indeks Materialowy - Uniform Material Index |
| AMS-R-83485/1-163 | 5/9 Secondary reference U.S. Government activity |
NSN 5331-01-485-6438 is a O-Ring, manufactured by Rtx Corporation Div Pratt & Whitney, classified under FSC 5331, O-ring. Status: active.
NSN 5331-01-485-6438 has 5 manufacturer part numbers on file: ST1946-163 (Rtx Corporation Div Pratt & Whitney), ST1946-163 (Parker-Hannifin Corp Div O-Ring Division), ST1946-163 (Acushnet Rubber Company, Inc. Dba Precix), ST1946-163 (Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney), ST1946-163 (Freudenberg-Nok General Partnership Dba International Seal Co Inc).
1 possible match (shared part number, not a government interchangeability claim): 5331-01-540-4486. Verify interchangeability with system specifications before substitution.
Key specifications for ST1946-163: Cross-Sectional Height: 0.100 INCHES MINIMUM AND 0.106 INCHES MAXIMUM IN; Hardness Rating: 70.0 SHORE DUROMETER A MINIMUM AND 80.0 SHORE DUROMETER A MAXIMUM; Material Document and Classification: MIL-R-83451/1 MIL SPEC SINGLE MATERIAL RESPONSE; Center Hole Diameter: 5.952 INCHES MINIMUM AND 6.022 INCHES MAXIMUM IN. 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.
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.