The O-Ring, cataloged under National Stock Number 5331-01-494-7451, 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 5 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5331-01-494-7451 |
| Primary Part Number | ST7M251-5 |
| Item Name | O-Ring |
| FSC / FSG | 5331 / 53 — O-ring |
| Manufacturer | The Boeing Company Div Defense |
| Status | ACTIVE |
| Cross-Sectional Height | 0.023 INCHES MINIMUM AND 0.027 INCHES MAXIMUM IN |
| Hardness Rating | 70.0 SHORE DUROMETER A NOMINAL |
| Material Document and Classification | MIL-R-25988,TYPE I,CLASS 1,GRADE 70 MIL SPEC SINGLE MATERIAL RESPONSE |
| Center Hole Diameter | 0.141 INCHES MINIMUM AND 0.151 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 |
|---|---|
| 00146-025-F70 | Freudenberg-Nok General Partnership Dba International Seal Co Inc (USA) |
| ST7M251-5 PRIMARY | The Boeing Company Div Defense (USA) |
| Reference | Meaning |
|---|---|
| 7M80-5 | 5/9 Secondary reference The Boeing Company Div Defense |
| SZ7583-5 | 5/2 Secondary reference U.S. Government activity |
| CGR1601-0125-5 | 5/2 Secondary reference U.S. Government activity |
| 1966-014 | C/1 Advisory reference — outside the item-of-supply concept Parco, Llc |
NSN 5331-01-494-7451 is a O-Ring, manufactured by The Boeing Company Div Defense, classified under FSC 5331, O-ring. Status: active.
NSN 5331-01-494-7451 has 2 manufacturer part numbers on file: 00146-025-F70 (Freudenberg-Nok General Partnership Dba International Seal Co Inc), ST7M251-5 (The Boeing Company Div Defense).
Key specifications for ST7M251-5: Cross-Sectional Height: 0.023 INCHES MINIMUM AND 0.027 INCHES MAXIMUM IN; Hardness Rating: 70.0 SHORE DUROMETER A NOMINAL; Material Document and Classification: MIL-R-25988,TYPE I,CLASS 1,GRADE 70 MIL SPEC SINGLE MATERIAL RESPONSE; Special Features: BOLT DIA 5/32. 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.