The O-Ring, cataloged under National Stock Number 5331-01-395-4646, is classified within Federal Supply Class 5331 (O-ring) of the Hardware and Abrasives group. The manufacturer of record is Meggitt Oregon Inc Dba Meggitt Oregon Inc Div Meggitt Polymers & Composites. Government technical data includes 3 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5331-01-395-4646 |
| Primary Part Number | ST7M258H550 |
| Item Name | O-Ring |
| FSC / FSG | 5331 / 53 — O-ring |
| Manufacturer | Meggitt Oregon Inc Dba Meggitt Oregon Inc Div Meggitt Polymers & Composites |
| Status | ACTIVE |
| Temp Rating | -65.0 FAHRENHEIT AND 600.0 FAHRENHEIT DEGF |
| Cross-Sectional Height | 0.260 INCHES MINIMUM AND 0.280 INCHES MAXIMUM IN |
| Center Hole Diameter | 5.470 INCHES MINIMUM AND 5.500 INCHES MAXIMUM IN |
| 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 |
|---|---|
| ST7M258H550 PRIMARY | Meggitt Oregon Inc Dba Meggitt Oregon Inc Div Meggitt Polymers & Composites (USA) |
| 600-550 | Meggitt Oregon Inc Dba Meggitt Oregon Inc Div Meggitt Polymers & Composites (USA) |
| Reference | Meaning |
|---|---|
| ST7M258H550 | 7/2 Vendor item drawing reference The Boeing Company Div Defense |
| 600-550 | 5/9 Secondary reference Rsa Engineered Products, Llc Dba Rsa Engineered Products Llc |
NSN 5331-01-395-4646 is a O-Ring, manufactured by Meggitt Oregon Inc Dba Meggitt Oregon Inc Div Meggitt Polymers & Composites, classified under FSC 5331, O-ring. Status: active.
NSN 5331-01-395-4646 has 2 manufacturer part numbers on file: ST7M258H550 (Meggitt Oregon Inc Dba Meggitt Oregon Inc Div Meggitt Polymers & Composites), 600-550 (Meggitt Oregon Inc Dba Meggitt Oregon Inc Div Meggitt Polymers & Composites).
Key specifications for ST7M258H550: Temp Rating: -65.0 FAHRENHEIT AND 600.0 FAHRENHEIT DEGF; Cross-Sectional Height: 0.260 INCHES MINIMUM AND 0.280 INCHES MAXIMUM IN; Center Hole Diameter: 5.470 INCHES MINIMUM AND 5.500 INCHES MAXIMUM IN. 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.