The O-Ring, cataloged under National Stock Number 5331-01-129-0631, is classified within Federal Supply Class 5331 (O-ring) of the Hardware and Abrasives group. The manufacturer of record is The Boeing Company Div Defense. Government technical data includes 6 specifications, cited from the U.S. Government catalog. The record lists 3 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5331-01-129-0631 |
| Primary Part Number | ST7M251-14 |
| Item Name | O-Ring |
| FSC / FSG | 5331 / 53 — O-ring |
| Manufacturer | The Boeing Company Div Defense |
| Status | ACTIVE |
| Cross-Sectional Height | 0.042 INCHES MINIMUM AND 0.048 INCHES MAXIMUM IN |
| Hardness Rating | 70.0 SHORE DUROMETER A NOMINAL |
| Material Document and Classification | MIL-R-25988 TYPE 1, CLASS 1, GRADE 70 MIL SPEC SINGLE MATERIAL RESPONSE |
| Elongation Percentage | 125 MAXIMUM |
| Center Hole Diameter | 0.420 INCHES MINIMUM AND 0.432 INCHES MAXIMUM IN |
| Material | RUBBER FLUOROSILICONE CLASS FQ |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| ST7M251-14 PRIMARY | The Boeing Company Div Defense (USA) |
| 00426-045 F70 | Freudenberg-Nok General Partnership Dba International Seal Co Inc (USA) |
| 1966-020A | Parco, Llc (USA) |
| Reference | Meaning |
|---|---|
| MIL-R-25988 | 4/1 Identification reference U.S. Government activity |
| LRC63047-14 | 5/9 Secondary reference Loadholtz Rubber Co Inc |
| CGR1601-0125-14 | 5/2 Secondary reference U.S. Government activity |
| 10163890 | 6/9 Informative reference only Nimikkeistokeskus Ncb Finland |
| SZ7583-14 | 5/2 Secondary reference U.S. Government activity |
NSN 5331-01-129-0631 is a O-Ring, manufactured by The Boeing Company Div Defense, classified under FSC 5331, O-ring. Status: active.
NSN 5331-01-129-0631 has 3 manufacturer part numbers on file: ST7M251-14 (The Boeing Company Div Defense), 00426-045 F70 (Freudenberg-Nok General Partnership Dba International Seal Co Inc), 1966-020A (Parco, Llc).
Key specifications for ST7M251-14: Cross-Sectional Height: 0.042 INCHES MINIMUM AND 0.048 INCHES MAXIMUM IN; Hardness Rating: 70.0 SHORE DUROMETER A NOMINAL; Material Document and Classification: MIL-R-25988 TYPE 1, CLASS 1, GRADE 70 MIL SPEC SINGLE MATERIAL RESPONSE; Elongation Percentage: 125 MAXIMUM. 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.