The O-Ring, cataloged under National Stock Number 5331-01-633-7528, is classified within Federal Supply Class 5331 (O-ring) of the Hardware and Abrasives group. The manufacturer of record is Exlar Corporation. Government technical data includes 7 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5331-01-633-7528 |
| Primary Part Number | 44439 |
| Item Name | O-Ring |
| FSC / FSG | 5331 / 53 — O-ring |
| Manufacturer | Exlar Corporation |
| Status | ACTIVE |
| Temp Rating | 250.0 FAHRENHEIT DEGF |
| Cross-Sectional Height | 0.205 INCHES MINIMUM AND 0.215 INCHES MAXIMUM IN |
| Outside Diameter | 8.625 INCHES NOMINAL IN |
| Hardness Rating | 75.0 SHORE DUROMETER D NOMINAL |
| Peripheral Diameter | 8.625 INCHES NOMINAL IN |
| Center Hole Diameter | 8.175 INCHES MINIMUM AND 8.275 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 | X |
| Part Number | Manufacturer |
|---|---|
| 44439 PRIMARY | Exlar Corporation (USA) |
| Reference | Meaning |
|---|---|
| 40200 ITEM 112 | D/9 Drawing number reference only Exlar Corporation |
NSN 5331-01-633-7528 is a O-Ring, manufactured by Exlar Corporation, classified under FSC 5331, O-ring. Status: active.
NSN 5331-01-633-7528 has 1 manufacturer part number on file: 44439 (Exlar Corporation).
Key specifications for 44439: Temp Rating: 250.0 FAHRENHEIT DEGF; Cross-Sectional Height: 0.205 INCHES MINIMUM AND 0.215 INCHES MAXIMUM IN; Outside Diameter: 8.625 INCHES NOMINAL IN; Hardness Rating: 75.0 SHORE DUROMETER D NOMINAL. 7 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.