The O-Ring, cataloged under National Stock Number 5331-00-251-6485, is classified within Federal Supply Class 5331 (O-ring) of the Hardware and Abrasives group. The manufacturer of record is United Technologies Corporation Dba Chemical Systems Div. Government technical data includes 5 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 5331-00-251-6485 |
| Primary Part Number | 1146138-1 |
| Item Name | O-Ring |
| FSC / FSG | 5331 / 53 — O-ring |
| Manufacturer | United Technologies Corporation Dba Chemical Systems Div |
| Status | ACTIVE |
| Cross-Sectional Height | 0.155 INCHES NOMINAL IN |
| Hardness Rating | 65.0 SHORE DUROMETER A NOMINAL |
| Center Hole Diameter | 20.986 INCHES MINIMUM AND 21.046 INCHES MAXIMUM IN |
| Material | RUBBER SYNTHETIC |
| Nuclear Hardness Critical Feature | HARDENED |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | H |
| Part Number | Manufacturer |
|---|---|
| 1146138-1 PRIMARY | United Technologies Corporation Dba Chemical Systems Div (USA) |
| Reference | Meaning |
|---|---|
| 1146138-1 | 5/9 Secondary reference Aerojet Rocketdyne Inc |
NSN 5331-00-251-6485 is a O-Ring, manufactured by United Technologies Corporation Dba Chemical Systems Div, classified under FSC 5331, O-ring. Status: active.
NSN 5331-00-251-6485 has 1 manufacturer part number on file: 1146138-1 (United Technologies Corporation Dba Chemical Systems Div).
Key specifications for 1146138-1: Cross-Sectional Height: 0.155 INCHES NOMINAL IN; Hardness Rating: 65.0 SHORE DUROMETER A NOMINAL; Special Features: DESIGN ANALYSIS; NUCLEAR HARDNESS CRITICAL; Center Hole Diameter: 20.986 INCHES MINIMUM AND 21.046 INCHES MAXIMUM IN. 5 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.