The O-Ring, cataloged under National Stock Number 5331-01-644-9642, is classified within Federal Supply Class 5331 (O-ring) of the Hardware and Abrasives group. The manufacturer of record is Clemco Industries Corp. Dba Clemco Industries Corp Div Clemco. Government technical data includes 1 specification, 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 | 5331-01-644-9642 |
| Primary Part Number | 01990 |
| Item Name | O-Ring |
| FSC / FSG | 5331 / 53 — O-ring |
| Manufacturer | Clemco Industries Corp. Dba Clemco Industries Corp Div Clemco |
| Status | ACTIVE |
| Outside Diameter | 1.75 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 |
|---|---|
| 01990 PRIMARY | Clemco Industries Corp. Dba Clemco Industries Corp Div Clemco (USA) |
NSN 5331-01-644-9642 is a O-Ring, manufactured by Clemco Industries Corp. Dba Clemco Industries Corp Div Clemco, classified under FSC 5331, O-ring. Status: active.
NSN 5331-01-644-9642 has 1 manufacturer part number on file: 01990 (Clemco Industries Corp. Dba Clemco Industries Corp Div Clemco).
Key specifications for 01990: Outside Diameter: 1.75 INCHES NOMINAL IN; Part Name Assigned by Controlling Agency: O-RING. 1 specification is 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.