The O-Ring, cataloged under National Stock Number 5331-01-631-4284, is classified within Federal Supply Class 5331 (O-ring) of the Hardware and Abrasives group. The manufacturer of record is Norman Filter Company, L.l.c. Dba Norman Filter Co Llc. Government technical data includes 2 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. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5331-01-631-4284 |
| Primary Part Number | 521806 |
| Item Name | O-Ring |
| FSC / FSG | 5331 / 53 — O-ring |
| Manufacturer | Norman Filter Company, L.l.c. Dba Norman Filter Co Llc |
| Status | ACTIVE |
| Cross-Sectional Height | 0.139 INCHES NOMINAL IN |
| Center Hole Diameter | 1.234 INCHES NOMINAL 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 |
|---|---|
| 521806 PRIMARY | Norman Filter Company, L.l.c. Dba Norman Filter Co Llc (USA) |
NSN 5331-01-631-4284 is a O-Ring, manufactured by Norman Filter Company, L.l.c. Dba Norman Filter Co Llc, classified under FSC 5331, O-ring. Status: active.
NSN 5331-01-631-4284 has 1 manufacturer part number on file: 521806 (Norman Filter Company, L.l.c. Dba Norman Filter Co Llc).
Key specifications for 521806: Cross-Sectional Height: 0.139 INCHES NOMINAL IN; Center Hole Diameter: 1.234 INCHES NOMINAL IN. 2 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.