The O-Ring, cataloged under National Stock Number 5331-00-402-0081, is classified within Federal Supply Class 5331 (O-ring) of the Hardware and Abrasives group. The manufacturer of record is R & B Plastics Inc. Government technical data includes 3 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5331-00-402-0081 |
| Primary Part Number | S4540031-11 |
| Item Name | O-Ring |
| FSC / FSG | 5331 / 53 — O-ring |
| Manufacturer | R & B Plastics Inc |
| Status | ACTIVE |
| Cross-Sectional Height | 0.047 INCHES MINIMUM AND 0.053 INCHES MAXIMUM IN |
| Center Hole Diameter | 0.562 INCHES MINIMUM AND 0.572 INCHES MAXIMUM IN |
| Material | PLASTIC POLYTETRAFLUOROETHYLENE |
| 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 |
|---|---|
| S4540031-11 PRIMARY | R & B Plastics Inc (USA) |
| Reference | Meaning |
|---|---|
| S4540031-11 | 5/2 Secondary reference U.S. Government activity |
NSN 5331-00-402-0081 is a O-Ring, manufactured by R & B Plastics Inc, classified under FSC 5331, O-ring. Status: active.
NSN 5331-00-402-0081 has 1 manufacturer part number on file: S4540031-11 (R & B Plastics Inc).
Key specifications for S4540031-11: Cross-Sectional Height: 0.047 INCHES MINIMUM AND 0.053 INCHES MAXIMUM IN; Center Hole Diameter: 0.562 INCHES MINIMUM AND 0.572 INCHES MAXIMUM IN; Material: PLASTIC POLYTETRAFLUOROETHYLENE. 3 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.