The Nut,union, cataloged under National Stock Number 4730-01-257-6937, is classified within Federal Supply Class 4730 (Hose, Pipe, Tube, Lubrication, and Railing Fittings) of the Pipe, Tubing, Hose, and Fittings group. The manufacturer of record is Lake Shore Systems, Inc.. Government technical data includes 12 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4730-01-257-6937 |
| Primary Part Number | 0451B0023-1 |
| Item Name | Nut,union |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Manufacturer | Lake Shore Systems, Inc. |
| Status | ACTIVE |
| Width Across Flats | 0.625 INCHES NOMINAL IN |
| Thread Series | UNF |
| Temp Rating | -20.0 FAHRENHEIT MINIMUM AND 225.0 FAHRENHEIT MAXIMUM DEGF |
| Maximum Working Pressure Rating and Service for Which Designed | 3000.0 POUNDS PER SQUARE INCH (PSI) OIL LBS |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 0.438 INCHES IN |
| Nut Height | 0.375 INCHES NOMINAL IN |
| Nut Style | HEXAGON |
| Thread Class | 2B |
| Thread Quantity Per Inch | 20 |
| Material | STEEL COMP 304 OVERALL |
| Smallest Inside Diameter | 0.250 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 |
|---|---|
| 0451B0023-1 PRIMARY | Lake Shore Systems, Inc. (USA) |
| Reference | Meaning |
|---|---|
| 0451B0023-1 | C/1 Advisory reference — outside the item-of-supply concept Lockheed Martin Corporation Div Rms |
| 6534C596-1 | C/1 Advisory reference — outside the item-of-supply concept U.S. Government activity |
| H850N-4-SS | 3/2 Design control — primary reference U.S. Government activity |
NSN 4730-01-257-6937 is a Nut,union, manufactured by Lake Shore Systems, Inc., classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
NSN 4730-01-257-6937 has 1 manufacturer part number on file: 0451B0023-1 (Lake Shore Systems, Inc.).
Key specifications for 0451B0023-1: Width Across Flats: 0.625 INCHES NOMINAL IN; Thread Series: UNF; Temp Rating: -20.0 FAHRENHEIT MINIMUM AND 225.0 FAHRENHEIT MAXIMUM DEGF; Maximum Working Pressure Rating and Service for Which Designed: 3000.0 POUNDS PER SQUARE INCH (PSI) OIL LBS. 12 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.