The O-Ring, cataloged under National Stock Number 5331-01-439-9955, is classified within Federal Supply Class 5331 (O-ring) of the Hardware and Abrasives group. The manufacturer of record is Acushnet Rubber Company, Inc. Dba Precix. Government technical data includes 3 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through both NSN and commercial part number lookups. 6 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 5331-01-439-9955 |
| Primary Part Number | ST1946-127 |
| Item Name | O-Ring |
| FSC / FSG | 5331 / 53 — O-ring |
| Manufacturer | Acushnet Rubber Company, Inc. Dba Precix |
| Status | ACTIVE |
| Cross-Sectional Height | 0.100 INCHES MINIMUM AND 0.106 INCHES MAXIMUM IN |
| Center Hole Diameter | 1.412 INCHES MINIMUM AND 1.436 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 |
|---|---|
| ST1946-127 PRIMARY | Acushnet Rubber Company, Inc. Dba Precix (USA) |
| ST1946-127 | Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney (USA) |
| ST1946-127 PRIMARY | Freudenberg-Nok General Partnership Dba International Seal Co Inc (USA) |
| ST1946-127 PRIMARY | Parker-Hannifin Corp Div O-Ring Division (USA) |
| ST1946-127 PRIMARY | Rtx Corporation Div Pratt & Whitney (USA) |
| Reference | Meaning |
|---|---|
| AMC-R-83485 | 5/9 Secondary reference U.S. Government activity |
| M83485/1-127 | 5/9 Secondary reference U.S. Government activity |
| 5331PL0848134 | 6/9 Informative reference only Jednolity Indeks Materialowy - Uniform Material Index |
| M83485/1-127 | 5/9 Secondary reference U.S. Government activity |
| MIL-R-83485 | 5/9 Secondary reference U.S. Government activity |
| 5331PL2028372 | 6/9 Informative reference only Jednolity Indeks Materialowy - Uniform Material Index |
NSN 5331-01-439-9955 is a O-Ring, manufactured by Acushnet Rubber Company, Inc. Dba Precix, classified under FSC 5331, O-ring. Status: active.
NSN 5331-01-439-9955 has 5 manufacturer part numbers on file: ST1946-127 (Acushnet Rubber Company, Inc. Dba Precix), ST1946-127 (Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney), ST1946-127 (Freudenberg-Nok General Partnership Dba International Seal Co Inc), ST1946-127 (Parker-Hannifin Corp Div O-Ring Division), ST1946-127 (Rtx Corporation Div Pratt & Whitney).
1 possible match (shared part number, not a government interchangeability claim): 5331-01-646-7895. Verify interchangeability with system specifications before substitution.
Key specifications for ST1946-127: Cross-Sectional Height: 0.100 INCHES MINIMUM AND 0.106 INCHES MAXIMUM IN; Center Hole Diameter: 1.412 INCHES MINIMUM AND 1.436 INCHES MAXIMUM IN; Material: RUBBER FLUOROCARBON CLASS FPM. 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.