The O-Ring, cataloged under National Stock Number 5331-01-556-5165, is classified within Federal Supply Class 5331 (O-ring) of the Hardware and Abrasives group. The manufacturer of record is Nd Defense Llc. 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Item Name | O-Ring |
| FSC / FSG | 5331 — O-ring (FSG 53) |
| Manufacturers | Nd Defense Llc (CAGE 338X5) |
| Parameter | Value |
|---|---|
| NSN | 5331-01-556-5165 |
| Primary Part Number | 1844447C1 |
| Item Name | O-Ring |
| FSC / FSG | 5331 / 53 — O-ring |
| Manufacturer | Nd Defense Llc |
| Status | ACTIVE |
| 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 |
|---|---|
| 1844447C1 PRIMARY | Nd Defense Llc (USA) |
| Reference | Meaning |
|---|---|
| EMD-1484 | D/9 Drawing number reference only Nd Defense Llc |
NSN 5331-01-556-5165 is a O-Ring, manufactured by Nd Defense Llc, classified under FSC 5331, O-ring. Status: active.
NSN 5331-01-556-5165 has 1 manufacturer part number on file: 1844447C1 (Nd Defense Llc).
1 possible match (shared part number, not a government interchangeability claim): 5331-01-566-5646. Verify interchangeability with system specifications before substitution.
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.