The O-Ring, cataloged under National Stock Number 5331-01-437-0556, is classified within Federal Supply Class 5331 (O-ring) of the Hardware and Abrasives group. The manufacturer of record is Mackay Communications Inc Dba Mackay Marine. 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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.
| Item Name | O-Ring |
| FSC / FSG | 5331 — O-ring (FSG 53) |
| Manufacturers | Mackay Communications Inc Dba Mackay Marine (CAGE 3K816) |
| Parameter | Value |
|---|---|
| NSN | 5331-01-437-0556 |
| Primary Part Number | M2L3143-1A ITEM 4 |
| Item Name | O-Ring |
| FSC / FSG | 5331 / 53 — O-ring |
| Manufacturer | Mackay Communications Inc Dba Mackay Marine |
| 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 |
|---|---|
| M2L3143-1A ITEM 4 PRIMARY | Mackay Communications Inc Dba Mackay Marine (USA) |
| Reference | Meaning |
|---|---|
| 0630-3039 | 5/9 Secondary reference Mackay Communications Inc Dba Mackay Marine |
NSN 5331-01-437-0556 is a O-Ring, manufactured by Mackay Communications Inc Dba Mackay Marine, classified under FSC 5331, O-ring. Status: active.
NSN 5331-01-437-0556 has 1 manufacturer part number on file: M2L3143-1A ITEM 4 (Mackay Communications Inc Dba Mackay Marine).
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.