The O-Ring, cataloged under National Stock Number 5331-01-231-5213, is classified within Federal Supply Class 5331 (O-ring) of the Hardware and Abrasives group. The manufacturer of record is Stanley M. Proctor Company, Llc. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | Stanley M. Proctor Company, Llc (CAGE 7A368) |
| Parameter | Value |
|---|---|
| NSN | 5331-01-231-5213 |
| Primary Part Number | 568218-21 |
| Item Name | O-Ring |
| FSC / FSG | 5331 / 53 — O-ring |
| Manufacturer | Stanley M. Proctor Company, 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 |
|---|---|
| 568218-21 | Stanley M. Proctor Company, Llc (USA) |
| Reference | Meaning |
|---|---|
| LL-HX4-2935 | 5/9 Secondary reference Defense Logistics Agency Dba Defense Supply Center Philadelphia |
| 568218-38 | 5/9 Secondary reference U.S. Government activity |
| PL-52699 PIECE 10 | 5/9 Secondary reference U.S. Government activity |
| 568218-21 | 3/9 Design control — primary reference U.S. Government activity |
| P00461NRP | 5/9 Secondary reference Defense Logistics Agency Dba Defense Supply Center Philadelphia |
NSN 5331-01-231-5213 is a O-Ring, manufactured by Stanley M. Proctor Company, Llc, classified under FSC 5331, O-ring. Status: active.
NSN 5331-01-231-5213 has 1 manufacturer part number on file: 568218-21 (Stanley M. Proctor Company, Llc).
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.