The O-Ring, cataloged under National Stock Number 5331-01-339-0718, is classified within Federal Supply Class 5331 (O-ring) of the Hardware and Abrasives group. The manufacturer of record is Rulyn Inc. The record lists 1 manufacturer part number 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | Rulyn Inc (CAGE 58305) |
| Parameter | Value |
|---|---|
| NSN | 5331-01-339-0718 |
| Primary Part Number | 568-216 PIECE 10 |
| Item Name | O-Ring |
| FSC / FSG | 5331 / 53 — O-ring |
| Manufacturer | Rulyn 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 |
|---|---|
| 568-216 PIECE 10 PRIMARY | Rulyn Inc (USA) |
| Reference | Meaning |
|---|---|
| AS568-216 | C/1 Advisory reference — outside the item-of-supply concept Zf Industrieantriebe Witten Gmbh |
| B4-00-800 PIECE 10 | 5/9 Secondary reference Rulyn Inc |
NSN 5331-01-339-0718 is a O-Ring, manufactured by Rulyn Inc, classified under FSC 5331, O-ring. Status: active.
NSN 5331-01-339-0718 has 1 manufacturer part number on file: 568-216 PIECE 10 (Rulyn Inc).
1 possible match (shared part number, not a government interchangeability claim): 5331-01-667-4055. 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.