The Tee,pipe to Tube, cataloged under National Stock Number 4730-00-423-9989, 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 23 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4730-00-423-9989 |
| Primary Part Number | 6B9588 |
| Item Name | Tee,pipe to Tube |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Manufacturer | Caterpillar Inc Div Caterpillar Defense |
| Status | ACTIVE |
| Furnished Items and Quantity | 2 FERRULE SLEEVE AND 2 SHORT COUPLING NUT |
| Connection Style | COMPRESSION (TUBE) FIRST END |
| Connection Style | PLAIN (PIPE) THIRD END |
| Connection Style | COMPRESSION (TUBE) SECOND END |
| Seat Nominal Radius | 0.062 INCHES FIRST END IN |
| Seat Nominal Radius | 0.062 INCHES SECOND END IN |
| Connection Type | THREADED EXTERNAL PIPE THIRD END |
| Connection Type | THREADED EXTERNAL TUBE FIRST END |
| Connection Type | THREADED EXTERNAL TUBE SECOND END |
| Nominal Outside Diameter Tube Accommodated | 0.375 INCHES FIRST END IN |
| Nominal Outside Diameter Tube Accommodated | 0.188 INCHES SECOND END IN |
| Leg Length | 1.060 INCHES NOMINAL SECOND END IN |
| Leg Length | 1.060 INCHES NOMINAL FIRST END IN |
| Leg Length | 1.090 INCHES NOMINAL THIRD END IN |
| Nominal Thread Size | 0.375 INCHES SECOND END IN |
| Nominal Thread Size | 0.562 INCHES FIRST END IN |
| Nominal Thread Size | 0.250 INCHES THIRD END IN |
| Thread Class | 2A SECOND END A |
| Thread Class | 2A FIRST END A |
| Material | COPPER ALLOY OVERALL |
| Thread Series Designator | NPT THIRD END |
| Thread Series Designator | UNF FIRST END |
| Thread Series Designator | UNF SECOND END |
| 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 |
|---|---|
| 6B9588 PRIMARY | Caterpillar Inc Div Caterpillar Defense (USA) |
| Reference | Meaning |
|---|---|
| 43232 | 5/9 Secondary reference Imperial |
| 43232 1-4X3-8 | 5/9 Secondary reference Imperial |
NSN 4730-00-423-9989 is a Tee,pipe to Tube, manufactured by Caterpillar Inc Div Caterpillar Defense, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
NSN 4730-00-423-9989 has 1 manufacturer part number on file: 6B9588 (Caterpillar Inc Div Caterpillar Defense).
2 possible matches (shared part number, not a government interchangeability claim): 4320-01-288-9716, 6140-01-414-9800. Verify interchangeability with system specifications before substitution.
Key specifications for 6B9588: Furnished Items and Quantity: 2 FERRULE SLEEVE AND 2 SHORT COUPLING NUT; Connection Style: COMPRESSION (TUBE) FIRST END; Connection Style: PLAIN (PIPE) THIRD END; Connection Style: COMPRESSION (TUBE) SECOND END. 23 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.