Manual Welding Chucks
Self-Centering Chucks for Welding, Cutting & Workpiece Positioning
MecBase supplies manual self-centering welding chucks for holding and positioning pipes, flanges, cylinders and other workpieces during welding and cutting operations.
Our available chuck configurations include large through-bore, lightweight, heavy-duty and wide-range designs, with chuck sizes covering applications from small fabrication work to large-diameter workpieces.
Standard models use synchronized jaws for self-centering. Depending on the series and application, custom 4-jaw, 6-jaw, 8-jaw and special multi-jaw configurations can also be supplied.
These chucks can be used with welding positioners, rotary welding systems, machine tools and other industrial equipment.
Manual Welding Chuck Features
Wide Clamping Range
Standard and reversed jaw configurations allow one chuck to accommodate different workpiece diameters.
Heavy-Duty Capacity
Available models provide load capacities from 30 kg to 1,200 kg, covering both lightweight and heavy fabrication applications.
Reversible Jaws
The jaws can be reversed to increase the available clamping diameter for larger pipes, flanges and cylindrical workpieces.
Extended Clamping Range
Selected WP models can be equipped with jaw extension tubes to significantly increase their working diameter.
Large Through-Bore Design
The WP600/WPS600 features a large through-bore suitable for large-diameter and long pipe applications.
Custom Configurations
Custom welding chucks and jaw configurations can be evaluated according to workpiece and equipment requirements.
Product Range at a Glance
| Series | Models | Max. Workpiece Range | Max. Clamping Force | Load Capacity* | Main Feature |
| WP | WP200–WP900 | Ø950 mm | —** | 1000 kg | Lightweight, large through-bore |
| WPS | WPS600–WPS1250 | Ø1250 mm | 100 kN | — | High clamping force, large bore |
| WPT | WPT600–WPT2000 | Ø2000 mm | 70 kN | 2000 kg | Very wide clamping range |
| K11/K12/K13 | Up to 1500 | Ø1500 mm | 120 kN | — | High rigidity, heavy-duty |
* Where load capacity is specified in the catalogue.
** WP Series catalogue specifies allowable clamping force in kg rather than kN.
WPS Series
Large Through-Bore Self-Centering Welding Chucks
The WPS Series combines features of lightweight welding chucks and machine-tool chucks.
A bevel-gear and scroll mechanism drives the jaws simultaneously in the radial direction, providing automatic workpiece centering.
The design offers high clamping force while reducing overall chuck thickness and weight. According to the manufacturer’s design description, the reduced profile helps lower the workpiece center distance when installed on welding equipment.
Available Sizes: WPS600–WPS1250
Maximum Clamping Range: up to Ø1250 mm
Maximum Clamping Force: up to 100 kN
Maximum Input Torque: up to 500 Nm
Best suited for:
Large through-bore applications, pipe fabrication, welding positioners and heavy workpieces.
WPS Series Technical Specifications
| Model | Chuck Ø | Max. Input Torque | Max. Clamping Force | Standard Jaw Range | Reversed Jaw Range |
| WPS600 | 605 mm | 400 Nm | 65 kN | Ø100–600 | Ø200–600 |
| WPS700 | 705 mm | 400 Nm | 70 kN | Ø100–700 | Ø200–700 |
| WPS750 | 755 mm | 400 Nm | 72 kN | Ø200–750 | Ø300–750 |
| WPS900 | 905 mm | 500 Nm | 75 kN | Ø200–900 | Ø300–900 |
| WPS960 | 960 mm | 500 Nm | 80 kN | Ø300–960 | Ø400–960 |
| WPS1100 | 1100 mm | 500 Nm | 90 kN | Ø400–1100 | Ø500–1100 |
| WPS1250 | 1300 mm | 500 Nm | 100 kN | Ø400–1250 | Ø500–1250 |
WP Series
Lightweight Large Through-Bore Welding Chucks
The WP Series is designed as a lightweight manual welding chuck with a large central opening.
The handle directly drives the scroll mechanism, allowing relatively quick manual clamping and release. The series is intended for welding and cutting applications where easy operation and reduced chuck thickness are important.
Available Sizes: WP200–WP900
Load Capacity: 30–1000 kg
Standard/Reversed Jaw Configurations
Custom Extended Jaws Available
Best suited for:
General pipe welding, flange fabrication and welding positioners.
WP Series Technical Specifications
| Model | Chuck Ø | Allowable Clamping Force | Load Capacity | Standard Jaw Range | Reversed Jaw Range |
| WP200 | 200 mm | 200 kg | 30 kg | Ø20–130 | Ø110–210 |
| WP300 | 300 mm | 250 kg | 120 kg | Ø20–190 | Ø170–300 |
| WP400 | 400 mm | 350 kg | 240 kg | Ø120–250 | Ø250–400 |
| WP500 | 500 mm | 600 kg | 600 kg | Ø200–340 | Ø360–500 |
| WP600 | 600 mm | 1200 kg | 1000 kg | Ø60–410 | Ø400–700 |
| WP750 | 750 mm | 1400 kg | 1000 kg | Ø250–580 | Ø550–850 |
| WP900 | 900 mm | 1500 kg | 1000 kg | Ø400–700 | Ø550–950 |
K11 / K12 / K13 Series
Heavy-Duty Self-Centering Chucks
The K11, K12 and K13 Series use a scroll mechanism in which the jaws move simultaneously to automatically center the workpiece.
Compared with the lightweight welding chuck series, these chucks are designed around high rigidity, high clamping force and accurate self-centering.
The catalogue identifies applications including machining centers, lathes, milling machines, CNC drilling machines, welding and cutting equipment.
Available Diameter: up to Ø1500 mm
Maximum Clamping Force: up to 120 kN
Maximum Input Torque: up to 1000 Nm
Custom jaw lengths and 4-jaw, 6-jaw, 8-jaw and other special chuck configurations are available according to application requirements.
K11 / K12 / K13 Series Technical Specifications
| Model | Max. Input Torque | Max. Clamping Force | Reversed Jaw Range | Standard Jaw Range |
| K11 400 / 500 | 500 Nm | 60 kN | Ø100–400 / Ø100–500 | Ø50–400 / Ø100–500 |
| K11 630 | 800 Nm | 72 kN | Ø200–630 | Ø100–600 |
| K11 800 | 900 Nm | 80 kN | Ø100–800 | Ø200–800 |
| K11 1000 | 1000 Nm | 90 kN | Ø300–1000 | Ø200–1000 |
| K11 1200 | 1000 Nm | 100 kN | Ø400–1200 | Ø300–1000 |
| K11 1500 | 1000 Nm | 120 kN | Ø500–1500 | Ø400–1500 |
WPT Series
Wide-Range Self-Centering Welding Chucks
The WPT Series features an open three-arm structure and is designed primarily for welding positioners and other welding/cutting equipment.
Its open structure provides a particularly wide clamping range while maintaining self-centering operation. The catalogue specifies load capacities of up to 2000 kg, depending on model.
Available Sizes: WPT600–WPT2000
Clamping Range: up to Ø2000 mm
Load Capacity: up to 2000 kg
Maximum Clamping Force: up to 70 kN
Best suited for:
Large pipes, tanks, cylinders and applications requiring a particularly wide diameter range.
WPT Series Technical Specifications
| Model | Max. Input Torque | Max. Clamping Force | Load Capacity | Clamping Range |
| WPT600 | 250 Nm | 35 kN | 1000 kg | Ø100–600 |
| WPT1000 | 300 Nm | 45 kN | 1500 kg | Ø200–1000 |
| WPT1200 | 300 Nm | 45 kN | 1500 kg | Ø200–1200 |
| WPT1500 | 400 Nm | 65 kN | 2000 kg | Ø300–1500 |
| WPT1600 | 500 Nm | 65 kN | 2000 kg | Ø300–1600 |
| WPT1800 | 500 Nm | 65 kN | 2000 kg | Ø300–1800 |
| WPT2000 | 600 Nm | 70 kN | 2000 kg | Ø300–2000 |
Custom Jaw Configurations
- 3-Jaw Self-Centering Chucks
Standard solution for pipes, flanges and cylindrical components. - 4-Jaw Chucks
Available for applications requiring additional support or different workpiece geometries. - 6-Jaw Chucks
Suitable for applications requiring multiple contact points around the workpiece. - 8-Jaw & Multi-Jaw Chucks
Available on selected heavy-duty/custom configurations. - Custom Irregular-Jaw Chucks
Jaw quantity, length and arrangement can be customized for special workpiece geometries.
Typical Applications
- Welding Positioners
- Mount the chuck onto a compatible welding positioner to grip and center the workpiece during rotation.
- Pipe & Flange Welding
- Suitable for holding circular pipes, flanges and fabricated components during circumferential welding.
- Welding & Cutting Systems
- Suitable for workpiece holding during welding and cutting operations.
- Tank & Vessel Fabrication
- Large WPT and WPS configurations can accommodate large-diameter cylindrical components, subject to load and center-of-gravity requirements.
- Machine Tool Applications
- K11/K12/K13 configurations can also be used with lathes, milling machines, machining centers and CNC drilling equipment, according to the catalogue.
How to Select a Manual Welding Chuck
① Workpiece Diameter
Provide minimum and maximum clamping diameter.
② Workpiece Weight
Provide the maximum total workpiece weight.
③ Workpiece Length
Long workpieces can significantly change the load acting on the chuck.
④ Center of Gravity
Especially important when the welding positioner tilts the workpiece.
⑤ Required Through-Bore
Specify whether long pipes need to pass through the center of the chuck.
⑥ Mounting Interface
Provide the welding positioner table diameter and mounting-hole dimensions.
⑦ Jaw Configuration
3-jaw, 4-jaw, 6-jaw, 8-jaw or custom.
⑧ Application
Welding / Cutting / Positioner / Machine Tool / Other.
Request a Quote
Need Help Selecting the Right Chuck?
Send us your workpiece and equipment information. We can evaluate the suitable chuck series, size, jaw configuration and mounting arrangement.
Workpiece: __________
Min. Diameter: __________ mm
Max. Diameter: __________ mm
Length: __________ mm
Maximum Weight: __________ kg
Jaw Configuration: 3 / 4 / 6 / 8 / Custom
Welding Positioner Model: __________
Positioner Table Diameter: __________ mm
Quantity: __________
Frequently Asked Questions
A self-centering welding chuck uses mechanically linked jaws that move together to center and clamp the workpiece.
The WP Series focuses on a lightweight, large-through-bore structure with fast manual clamping, while the WPS Series uses a bevel-gear and scroll mechanism and provides higher specified clamping forces for larger workpieces.
WPT is a wide-range self-centering chuck designed primarily for welding positioners and welding/cutting equipment. Models cover clamping ranges up to Ø2000 mm.
No. Depending on the series and application, custom 4-jaw, 6-jaw, 8-jaw and special multi-jaw configurations can be produced.
Yes. The catalogue specifically provides for extended/custom jaw configurations on several series.
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