Design chucks

揺動引込式 UBL ボールロックチャック SOUL-Woodworthシリーズ

Designed To Chuck Difficult-to-Grip Workpieces

Design Power Chucks developed through a technical tie-up (in 1969) between N.A.Woodworth (FORKARDT / now) and TEIKOKU CHUCK are designed to meet various kinds of individual user needs and are highly regarded as Japan's number one for the Design-Chucking range and track record

A broad chucking range allows optimum machining.

The UBL Chuck is a locking type power chuck that offers high levels of gripping performance, rigidity and durability to allow secure gripping of cast or forged materials with a draft angle and workpieces with an overhang, which conventional chucks can not grip. Also, they can improve the roundness of thin-walled parts and respond to difficult-to-grip complex-shape workpieces.

Our Designs based on original technology and know-how.

In addition to such basic types as Centralizing type (for general chucking) and Compensating type (for chucking with respect to boss or center hole), many other types such as ON-OFF (switchover type), Long Stroke, Large-Diameter Through Hole, and 6-Jaw types (for ID and OD chucking) are available as standard. Also, depending on applications, Quick Jaw, Special Jaw-actuator (base jaw), or Light-weight Jaw can be selected.
Since we design the entire chuck, with safety and machining performance taken into account, reliable and comfortable operations will be ensured.


  1. Gripping either inner or outer diameter of workpiece is possible with the same chuck.
  2. The excellent drawing function ensures accurate and stable chucking.
  3. The equalizing mechanism enables chucking of uneven thickness OD parts.
  4. Heavy-duty cutting of tapered workpieces is possible with a minimum gripping allowance.
  5. The circular motion ensures long service life.
  6. The inner parts are interchangeable.
  7. The arm seal and special waterproof seal offer excellent dust and water resistance.


UBL Centralizing

(3Jaw / 2Jaw / 6Jaw)

This is a general type chuck with the chucking portion centered, and with the stopper face aligned to edge face. This type of chuck securely clamps even raw material cast/forged parts with draft (up to 20°) to ensure consistent dimensional accuracy in the axial direction even during heavy-duty cutting.
Two-jaw or three-jaw structure is available. The chuck can be easily changed for either OD (outer diameter) or ID (inner diameter) chucking.
Jaws, stoppers and other upper parts are designed according to customer's individual needs. Also, a wide variety of jaws are selectable for various kinds of workpieces.
The carbide-insert jaw and special-shape jaw are effective for machining difficult-to-cut materials. The high-tensile aluminum jaw is suitable for high-speed machining. The Master/Jawpiece type and Quick Jaw Change System(Q.J.C.) are useful for Many kind of workpiece/small lot parts machining.


Quick Jaw design


UBL Compensating

The compensating type is designed to allow the jaws to grip a workpiece at equal forces along the workpiece perimeter with respect to both center/boss holes.
Two-jaw or three-jaw structure is available. All parts except the actuator are the same with those of the Centralizing type. The compensating-type UBL Chuck offers a wide range of chucking, depending on boss and center holes.
Also, this type features excellent cost efficiency and great adaptability to complex-shape cutting and high-load machining, as will as high levels of accuracy and maintainability.
In addition, special jaws, fixed center, reference pin, dynamic balance correction, combination design, etc. can be employed according to individual customer requirements in terms of machining accuracy, cutting conditions, and grip shape.  


Spring center type