The Inverted Nut,tube Coupling, cataloged under National Stock Number 4730-00-423-8262, 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 Caterpillar Inc Div Caterpillar Defense. Government technical data includes 13 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 | 4730-00-423-8262 |
| Primary Part Number | 1A5911 |
| Item Name | Inverted Nut,tube Coupling |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Manufacturer | Caterpillar Inc Div Caterpillar Defense |
| Status | ACTIVE |
| Width Across Flats | 0.563 INCHES NOMINAL IN |
| Seat Angle in Deg | 35.0 |
| Tube Outside Diameter for Which Designed | 0.375 INCHES NOMINAL IN |
| Style Designator | INVERTED NUT, TUBE, COMPRESSION |
| Material Document and Classification | SAE 72 ASSN STD SINGLE MATERIAL RESPONSE |
| Thread Direction | RIGHT-HAND |
| Casehardening Indicator | NOT CASEHARDENED |
| Thread Size | 9/16-18 |
| Screw Thread Series Designator | UNF |
| Thread Class | 3A A |
| Material | COPPER ALLOY 360 |
| Fabrication Method | BAR STOCK, MACHINED |
| Smallest Inside Diameter | 0.375 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 |
|---|---|
| 1A5911 PRIMARY | Caterpillar Inc Div Caterpillar Defense (USA) |
NSN 4730-00-423-8262 is a Inverted Nut,tube Coupling, manufactured by Caterpillar Inc Div Caterpillar Defense, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
NSN 4730-00-423-8262 has 1 manufacturer part number on file: 1A5911 (Caterpillar Inc Div Caterpillar Defense).
Key specifications for 1A5911: Width Across Flats: 0.563 INCHES NOMINAL IN; Seat Angle in Deg: 35.0; Tube Outside Diameter for Which Designed: 0.375 INCHES NOMINAL IN; Style Designator: INVERTED NUT, TUBE, COMPRESSION. 13 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.