The Nut,union, cataloged under National Stock Number 4730-00-203-0823, is classified within Federal Supply Class 4730 (Hose, Pipe, Tube, Lubrication, and Railing Fittings) of the Pipe, Tubing, Hose, and Fittings group. Government technical data includes 15 specifications, cited from the U.S. Government catalog. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4730-00-203-0823 |
| Item Name | Nut,union |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Status | ACTIVE |
| Shoulder Step Width | 0.125 INCHES NOMINAL IN |
| Shoulder Width | 0.156 INCHES NOMINAL IN |
| Thread Series | UNS |
| Material Document and Classification | QQ-B-626,1/2 H FED SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 0.812 INCHES IN |
| Nut Diameter | 1.000 INCHES NOMINAL IN |
| Nut Height | 1.000 INCHES NOMINAL IN |
| Surface Treatment | CHROMIUM OVERALL |
| Nut Style | ROUND |
| Thread Class | 2B |
| Thread Quantity Per Inch | 16 |
| Material | COPPER ALLOY 360 OVERALL |
| Smallest Inside Diameter | 0.630 INCHES NOMINAL IN |
| Shoulder Seat Diameter | 0.656 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 |
| Reference | Meaning |
|---|---|
| SCB66455 | 5/9 Secondary reference American Telephone and Telegraph Co |
| SCB66455 | 5/9 Secondary reference At and T Corp |
| SC-B-66455 | 3/2 Design control — primary reference U.S. Government activity |
NSN 4730-00-203-0823 is a Nut,union, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
Key specifications for 4730-00-203-0823: Shoulder Step Width: 0.125 INCHES NOMINAL IN; Shoulder Width: 0.156 INCHES NOMINAL IN; Thread Series: UNS; Material Document and Classification: QQ-B-626,1/2 H FED SPEC SINGLE MATERIAL RESPONSE OVERALL. 15 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.