The O-Ring, cataloged under National Stock Number 5331-01-727-6819, is classified within Federal Supply Class 5331 (O-ring) of the Hardware and Abrasives group. The manufacturer of record is Caterpillar Inc Div Caterpillar Defense. 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. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5331-01-727-6819 |
| Primary Part Number | 243-3565 |
| Item Name | O-Ring |
| FSC / FSG | 5331 / 53 — O-ring |
| Manufacturer | Caterpillar Inc Div Caterpillar Defense |
| Status | ACTIVE |
| Outside Diameter | 78.54 INCHES NOMINAL IN |
| Cross-Sectional Diameter | 0.135 INCHES NOMINAL IN |
| 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 |
|---|---|
| 243-3565 PRIMARY | Caterpillar Inc Div Caterpillar Defense (USA) |
NSN 5331-01-727-6819 is a O-Ring, manufactured by Caterpillar Inc Div Caterpillar Defense, classified under FSC 5331, O-ring. Status: active.
NSN 5331-01-727-6819 has 1 manufacturer part number on file: 243-3565 (Caterpillar Inc Div Caterpillar Defense).
Key specifications for 243-3565: Outside Diameter: 78.54 INCHES NOMINAL IN; Special Features: 71.7 MILLIMETER INNER DIAMETER O-RING SEAL MM; Part Name Assigned by Controlling Agency: O-RING SEAL; Cross-Sectional Diameter: 0.135 INCHES NOMINAL IN. 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.