The O-Ring, cataloged under National Stock Number 5331-01-422-1539, is classified within Federal Supply Class 5331 (O-ring) of the Hardware and Abrasives group. The manufacturer of record is Oerlikon Metco Us Inc. 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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.
| Item Name | O-Ring |
| FSC / FSG | 5331 — O-ring (FSG 53) |
| Manufacturers | Oerlikon Metco Us Inc (CAGE 01FK3) |
| Parameter | Value |
|---|---|
| NSN | 5331-01-422-1539 |
| Primary Part Number | ATC-129 |
| Item Name | O-Ring |
| FSC / FSG | 5331 / 53 — O-ring |
| Manufacturer | Oerlikon Metco Us Inc |
| Status | ACTIVE |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Part Number | Manufacturer |
|---|---|
| ATC-129 PRIMARY | Oerlikon Metco Us Inc (USA) |
| 4MP129 | Oerlikon Metco Us Inc (USA) |
| Reference | Meaning |
|---|---|
| ATC-129 | 5/9 Secondary reference Metco Inc Sub of the Perkin-Elmer Corp |
| 4MP129 | 5/9 Secondary reference Metco Inc Sub of the Perkin-Elmer Corp |
NSN 5331-01-422-1539 is a O-Ring, manufactured by Oerlikon Metco Us Inc, classified under FSC 5331, O-ring. Status: active.
NSN 5331-01-422-1539 has 2 manufacturer part numbers on file: ATC-129 (Oerlikon Metco Us Inc), 4MP129 (Oerlikon Metco Us Inc).
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.