The O-Ring, cataloged under National Stock Number 5331-00-945-2749, is classified within Federal Supply Class 5331 (O-ring) of the Hardware and Abrasives group. The manufacturer of record is Ontic Engineering & Manufacturing, Inc Dba Ontic Us. Government technical data includes 3 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5331-00-945-2749 |
| Primary Part Number | 1433-643376-2 |
| Item Name | O-Ring |
| FSC / FSG | 5331 / 53 — O-ring |
| Manufacturer | Ontic Engineering & Manufacturing, Inc Dba Ontic Us |
| Status | ACTIVE |
| Cross-Sectional Height | 0.057 INCHES MINIMUM AND 0.063 INCHES MAXIMUM IN |
| Center Hole Diameter | 3.141 INCHES MINIMUM AND 3.172 INCHES MAXIMUM IN |
| Material | RUBBER FLUOROCARBON CLASS FPM |
| 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 |
|---|---|
| X5-81577-545 | Parker-Hannifin Corp Div O-Ring Division (USA) |
| 1433-643376-2 PRIMARY | Ontic Engineering & Manufacturing, Inc Dba Ontic Us (USA) |
| Reference | Meaning |
|---|---|
| X5-81577-545 | 5/9 Secondary reference U.S. Government activity |
| 1433-643376-2 | 5/9 Secondary reference Parker-Hannifin Corporation Div Gas Turbine Fuel Systems |
NSN 5331-00-945-2749 is a O-Ring, manufactured by Ontic Engineering & Manufacturing, Inc Dba Ontic Us, classified under FSC 5331, O-ring. Status: active.
NSN 5331-00-945-2749 has 2 manufacturer part numbers on file: X5-81577-545 (Parker-Hannifin Corp Div O-Ring Division), 1433-643376-2 (Ontic Engineering & Manufacturing, Inc Dba Ontic Us).
Key specifications for 1433-643376-2: Cross-Sectional Height: 0.057 INCHES MINIMUM AND 0.063 INCHES MAXIMUM IN; Center Hole Diameter: 3.141 INCHES MINIMUM AND 3.172 INCHES MAXIMUM IN; Material: RUBBER FLUOROCARBON CLASS FPM. 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.