The Koike Aronson LD4 is a compact benchtop welding positioner that tilts from 0 to 105° across 8 fixed positions, handles up to 400 lb, and delivers a 300-amp rotary ground for MIG and TIG welding of small weldments and pipe flanges.
Engineered and manufactured by Aronson craftsmen in the USA, the LD4 Portable Benchtop Positioner sets the standard for build quality and performance in its class. Designed for smaller weldments — including pipe flanges with the optional 3-jaw chuck — it pairs precise, repeatable rotation with rugged worm-gear durability.
More than a welding positioner, the LD4 doubles as a smooth, controlled turntable for precision assembly and part positioning. In fabrication shops, pipe-welding training centers, and welding schools, it provides the controlled movement, repeatability, and toughness serious professionals demand.
Key Features
- 8 Fixed Tilting Positions: Tilt from 0 to 105° in 15° increments for repeatable, hands-free angle setup.
- Self-Locking Worm Gear Drive: Locks the tilt angle for maximum stability while welding — no drift under load.
- 300 A Rotary Ground: A 300-amp rotary ground connection keeps current flowing cleanly through full rotation.
- MIG & TIG Ready: 3/8" NPT tapped thru-holes at each end of the shaft supply inert shielding gas for TIG.
- Configurable Worktable: Four 9/16" T-slots accept fixtures fast; a 3/8" thru-hole passes cables and piping through the spindle.
- Momentary Foot Switch: Hands-free start/stop on an 8 ft cord for productive, two-handed welding.
- Optional 3-Jaw Self-Centering Chuck: Available in three sizes with an enclosed faceplate that blocks flux and weld spatter.
View full specifications, comparison & FAQ
Specifications
| Specification | Detail |
|---|---|
| Type | Benchtop tilting/rotating welding positioner |
| Rated Load Capacity | 400 lb |
| Tilt Range | 0° to 105° in 15° increments (8 fixed positions) |
| Tilt Mechanism | Self-locking worm gear drive |
| Ground Connection | 300 A rotary ground |
| Shielding Gas Ports | 3/8" NPT tapped thru-holes at each shaft end (for TIG) |
| Worktable | Four 9/16" T-slots; 3/8" center thru-hole through the spindle |
| Foot Control | Momentary foot switch, 8 ft cord |
| Welding Processes | MIG and TIG |
| Optional Chuck | 3-jaw self-centering scroll chuck (3 sizes), enclosed faceplate |
| Country of Origin | Made in USA (Koike Aronson) |
| SKU | LD0000 |
Best For
- Welding pipe flanges (with the optional 3-jaw chuck)
- Small weldments and sub-assemblies
- Pipe-welding training centers and welding schools
- Fabrication shop precision assembly
- Field and small-workshop work where a compact footprint matters
- General part positioning as a controlled turntable
How the LD4 Compares to Other Benchtop Positioners
| Model | Capacity | Tilt Range | Ground | Pipe-Flange Chuck | Made In |
|---|---|---|---|---|---|
| Koike LD4 | 400 lb | 0–105° (8 positions) | 300 A | Optional 3-jaw, enclosed faceplate | USA |
| MAC PS-1F | 200 lb | 0–90° | 500 A | Optional | USA |
| MAC PS-2F | 550 lb | 0–90° | 500 A | Optional | USA |
| Key Plant VP0.05 | 220 lb | 0–90° | — | Optional | Imported |
Frequently Asked Questions
What is the Koike LD4 welding positioner?
The Koike Aronson LD4 is a compact benchtop welding positioner that tilts from 0 to 105° across 8 fixed positions and provides a 300-amp rotary ground for MIG and TIG welding of small weldments and pipe flanges. It is built in the USA by Koike Aronson.
How far does the LD4 tilt?
The LD4 tilts from 0 to 105° in 15° increments, giving 8 fixed tilting positions. A self-locking worm gear drive holds the selected angle securely while you weld.
What is the load capacity of the LD4 positioner?
The LD4 has a rated load capacity of 400 lb, making it well suited to small weldments, pipe flanges, and precision sub-assemblies on the benchtop.
Can the LD4 weld pipe flanges?
Yes. With the optional 3-jaw self-centering scroll chuck it holds pipe and flanges securely, and a 3/8" thru-hole in the spindle lets you pass cables or piping through the center for clean rotation.
Is the LD4 compatible with MIG and TIG welding?
Yes. The LD4 is MIG- and TIG-ready, with a 300-amp rotary ground connection and 3/8" NPT tapped thru-holes at each end of the shaft for inert shielding-gas connections.
Where is the Koike LD4 made?
The LD4 is engineered and manufactured in the USA by Koike Aronson, built by the same Aronson craftsmen behind the company’s larger industrial positioners.
Who is the LD4 positioner best for?
It suits fabrication shops, pipe-welding training centers, welding schools, and precision-assembly work — anywhere you need controlled, repeatable rotation and tilting for smaller weldments in a compact footprint.
What controls and accessories are included?
The LD4 includes a momentary foot switch on an 8 ft cord for hands-free operation and a worktable with four 9/16" T-slots for fast fixture setup. The 3-jaw self-centering chuck is available as an option in three sizes.
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Great benchtop table
This table was a rock solid investment, we will be ordering more soon
