The O-Ring, cataloged under National Stock Number 5331-00-251-8506, is classified within Federal Supply Class 5331 (O-ring) of the Hardware and Abrasives group. The manufacturer of record is Lake Shore Systems, Inc.. Government technical data includes 2 specifications, cited from the U.S. Government catalog. 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 4 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5331-00-251-8506 |
| Primary Part Number | 111B |
| Item Name | O-Ring |
| FSC / FSG | 5331 / 53 — O-ring |
| Manufacturer | Lake Shore Systems, Inc. |
| Status | ACTIVE |
| Cross-Sectional Height | 0.500 INCHES NOMINAL IN |
| Material | RUBBER CHLOROPRENE CLASS CR |
| 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 |
|---|---|
| 111B PRIMARY | Lake Shore Systems, Inc. (USA) |
| Reference | Meaning |
|---|---|
| PURCHASEDETAIL5330-226-120 | 5/9 Secondary reference U.S. Government activity |
NSN 5331-00-251-8506 is a O-Ring, manufactured by Lake Shore Systems, Inc., classified under FSC 5331, O-ring. Status: active.
NSN 5331-00-251-8506 has 1 manufacturer part number on file: 111B (Lake Shore Systems, Inc.).
4 possible matches (shared part number, not a government interchangeability claim): 5905-00-323-9171, 5330-00-688-9894, 6625-00-793-1339. Verify interchangeability with system specifications before substitution.
Key specifications for 111B: Cross-Sectional Height: 0.500 INCHES NOMINAL IN; Material: RUBBER CHLOROPRENE CLASS CR. 2 specifications are documented in the U.S. Government catalog.
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.