K11 3-Jaw Welding Chuck
Heavy-Duty Self-Centering Chuck with Large Through-Hole
The K11 3-Jaw Welding Chuck is a heavy-duty self-centering chuck designed for secure and accurate clamping of round workpieces in welding, cutting and machining applications.
It adopts a planar scroll thread structure. Through the gear and scroll mechanism, the three jaws move simultaneously to automatically center the workpiece during clamping.
The K11 Series features high self-centering accuracy, high rigidity, strong clamping force and convenient workpiece setup, making it suitable for demanding workholding applications.
Jaw Configuration: 3-Jaw
Available Models: K11 400 – K11 1500
Maximum Clamping Range: Up to Ø1500 mm
Maximum Clamping Force: Up to 120 kN
Maximum Input Torque: Up to 1000 Nm
K11 Series Manual Welding Chuck Features
3-Jaw Self-Centering Design
Three jaws move simultaneously through the scroll mechanism, allowing round workpieces to be centered automatically during clamping.
Heavy-Duty Construction
The K11 Series is designed for applications requiring high rigidity and strong workholding capability.
High Clamping Force
Depending on the model, maximum specified clamping force ranges from 60 kN to 120 kN.
Large Through-Hole
The large center opening provides clearance for pipes, shafts, cylinders and other round workpieces.
High Self-Centering Accuracy
The synchronized three-jaw mechanism helps reduce manual alignment and improves setup efficiency.
Custom Options
The standard K11 product is supplied as a 3-jaw self-centering chuck.
For special applications, non-standard chuck configurations may be available upon request, including customized jaw lengths and alternative multi-jaw designs.
K11 Welding Chuck Performance Specifications
| Model | Maximum Input Torque | Maximum Clamping Force | Reverse Jaw Clamping Range | Positive Jaw Clamping Range |
| K11 400 / 500 | 500 Nm | 60 kN | Ø100–400 / Ø100–500 mm | Ø50–400 / Ø100–500 mm |
| K11 630 | 800 Nm | 72 kN | Ø200–630 mm | Ø100–600 mm |
| K11 800 | 900 Nm | 80 kN | Ø100–800 mm | Ø200–800 mm |
| K11 1000 | 1000 Nm | 90 kN | Ø300–1000 mm | Ø200–1000 mm |
| K11 1200 | 1000 Nm | 100 kN | Ø400–1200 mm | Ø300–1000 mm |
| K11 1500 | 1000 Nm | 120 kN | Ø500–1500 mm | Ø400–1500 mm |
These values are based on the supplied K11 Series technical table.
Connection Size Parameters
| Model | D | D1 | D2 (H7) | D3 | H | H1 | H2 | L | Z-d |
| K11 400 | Ø400 | Ø368 | Ø340 | Ø170 | 100 | 40 | 6 | 125 | 3-M16 |
| K11 500 | Ø500 | Ø465 | Ø440 | Ø240 | 115 | 45 | 6 | 185 | 6-M16 |
| K11 630 | Ø630 | Ø590 | Ø560 | Ø320 | 125 | 50 | 12 | 250 | 6-M16 |
| K11 800 | Ø800 | Ø760 | Ø730 | Ø480 | 130 | 50 | 12 | 320 | 6-M16 |
| K11 1000 | Ø1000 | Ø950 | Ø902 | Ø642 | 150 | 60 | 15 | 350 | 6-M20 |
| K11 1200 | Ø1200 | Ø1140 | Ø1080 | Ø850 | 150 | 60 | 15 | 350 | 9-M20 |
| K11 1500 | Ø1500 | Ø1440 | Ø1380 | Ø1100 | 150 | 80 | 15 | 425 | 9-M20 |
Dimensions in mm.
These connection dimensions are based on the supplied technical data and are intended for product selection and equipment matching.
Positive Jaw & Reverse Jaw Clamping
Positive Jaw Clamping
Positive jaws are used for the normal internal clamping range of each K11 model.
For example:
- K11 1000
Positive Jaw Range: Ø200–1000 mm - K11 1500
Positive Jaw Range: Ø400–1500 mm
Reverse Jaw Clamping
Reverse jaws can be used when a different or larger clamping diameter is required.
For example:
- K11 1200
Reverse Jaw Range: Ø400–1200 mm
The available range varies by model, so the workpiece diameter and jaw arrangement should be confirmed before selection.
Typical Applications
Welding Positioners
K11 chucks can be used as heavy-duty workholding devices on suitable welding positioners.
Pipe & Cylinder Welding
The large through-hole and strong clamping capacity make the series suitable for pipes and cylindrical workpieces.
Heavy Fabrication
The high rigidity and clamping force make K11 chucks suitable for larger fabricated components and demanding workholding applications.
CNC & Machining Equipment
The product catalogue also lists applications on:
- Machining centers
- Lathes
- Milling machines
- CNC drilling machines
- Welding equipment
- Cutting equipment
This makes the K11 Series more versatile than a welding-only chuck.
How to Select a K11 Welding Chuck
1. Workpiece Diameter
Determine the minimum and maximum diameter of the workpiece.
2. Required Clamping Force
Choose the model according to the required holding force.
K11 models provide up to 120 kN maximum specified clamping force.
3. Workpiece Geometry
Consider whether the workpiece is a pipe, cylinder, shaft, flange or another circular component.
4. Jaw Configuration
Determine whether standard 3-jaw, 4-jaw, 6-jaw, 8-jaw or a custom arrangement is required.
5. Equipment Interface
Check D, D1, D2, D3 and mounting-hole dimensions against the welding positioner, rotary table or machine tool.
6. Operating Condition
For heavy workpieces, consider clamping position, workpiece length and center of gravity before final selection.
K11 Model Selection Guide
| Maximum Required Diameter | Model to Consider | Max. Clamping Force |
| Up to Ø400 mm | K11 400 | 60 kN* |
| Up to Ø500 mm | K11 500 | 60 kN* |
| Up to Ø630 mm | K11 630 | 72 kN |
| Up to Ø800 mm | K11 800 | 80 kN |
| Up to Ø1000 mm | K11 1000 | 90 kN |
| Up to Ø1200 mm | K11 1200 | 100 kN |
| Up to Ø1500 mm | K11 1500 | 120 kN |
* The source table presents K11 400 / 500 as one combined performance row.
Note: This table is for preliminary diameter selection only. Final selection should also consider workpiece weight, jaw configuration, clamping range, rigidity requirements and equipment mounting dimensions.
Custom K11 Welding Chucks
The K11 Series can be customized for special workpieces and equipment requirements.
Available customization options include:
- Custom chuck diameter
- Custom jaw length
- 4-jaw configuration
- 6-jaw configuration
- 8-jaw configuration
- Special multi-jaw arrangements
- Other non-standard self-centering chuck designs
The catalogue explicitly supports customized sizes and forms of non-standard self-centering chucks.
K11 vs. WP vs. WPS vs. WPT Welding Chucks
| Feature | K11 Series | WP Series | WPS Series | WPT Series |
| Main Positioning | Heavy-duty self-centering | Lightweight welding | High-force large through-bore | Wide-range positioner chuck |
| Max. Diameter | Ø1500 mm | Ø950 mm | Ø1250 mm | Ø2000 mm |
| Max. Clamping Force | 120 kN | Listed in kg | 100 kN | 70 kN |
| Main Strength | Rigidity & clamping force | Quick clamping | High force & large bore | Large range & load |
| Custom Jaws | 4 / 6 / 8 / Custom | 4 / 6 / Custom | 4 / 6 / Custom | Not specifically listed |
| Welding Positioner Use | Yes | Yes | Yes | Primary application |
| Machine Tool Use | Yes | Not highlighted | Not highlighted | Not highlighted |
Why Choose K11 Welding Chucks?
- High Clamping Force
Up to 120 kN maximum specified clamping force. - Heavy-Duty Rigidity
Designed for stable workholding of larger and heavier components. - Large Through-Hole
Suitable for pipes, shafts and cylindrical workpieces. - Automatic Self-Centering
Synchronized jaw movement improves setup efficiency. - Wide Model Range
Available from K11 400 to K11 1500. - Custom Jaw Options
4-jaw, 6-jaw, 8-jaw and non-standard configurations are available.
Request a Quote
Looking for a K11 Welding Chuck?
Send us your workpiece and equipment information for model selection and quotation.
K11 Model: __________
Workpiece Type: __________
Minimum Diameter: __________ mm
Maximum Diameter: __________ mm
Workpiece Length: __________ mm
Workpiece Weight: __________ kg
Required Jaw Configuration: 3 / 4 / 6 / 8 / Custom
Required Clamping Range: __________ mm
Equipment / Positioner Model: __________
Mounting Dimensions: __________
Quantity: __________
For replacement applications, please send us photos, drawings or mounting dimensions of your existing chuck and equipment.
Frequently Asked Questions
The K11 Series is a self-centering chuck using a planar scroll thread mechanism. The gear and scroll drive the jaws simultaneously to automatically center the workpiece.
The supplied technical data includes K11 400, K11 500, K11 630, K11 800, K11 1000, K11 1200 and K11 1500.
The largest listed model, K11 1500, has a maximum specified clamping force of 120 kN.
No. The catalogue also lists machining centers, lathes, milling machines, CNC drilling machines and cutting equipment as suitable applications.
Yes. The catalogue states that custom jaw lengths and 4-jaw, 6-jaw, 8-jaw and other non-standard configurations can be supplied.
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