The O-Ring, cataloged under National Stock Number 5331-01-213-6764, is classified within Federal Supply Class 5331 (O-ring) of the Hardware and Abrasives group. The manufacturer of record is Dover Resources, Inc. Div Norriseal. 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | Dover Resources, Inc. Div Norriseal (CAGE 1NB39) |
| Parameter | Value |
|---|---|
| NSN | 5331-01-213-6764 |
| Primary Part Number | 52561A211 |
| Item Name | O-Ring |
| FSC / FSG | 5331 / 53 — O-ring |
| Manufacturer | Dover Resources, Inc. Div Norriseal |
| 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 |
|---|---|
| 52561A211 PRIMARY | Dover Resources, Inc. Div Norriseal (USA) |
| Reference | Meaning |
|---|---|
| 560-007 | 5/9 Secondary reference U.S. Government activity |
| 52561A211 | 5/9 Secondary reference U.S. Government activity |
NSN 5331-01-213-6764 is a O-Ring, manufactured by Dover Resources, Inc. Div Norriseal, classified under FSC 5331, O-ring. Status: active.
NSN 5331-01-213-6764 has 1 manufacturer part number on file: 52561A211 (Dover Resources, Inc. Div Norriseal).
1 possible match (shared part number, not a government interchangeability claim): 6220-01-513-7204. 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.