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For the short taper lathe chuck spindle noses Type A, D and C (DIN) measure the pilot diameter and length, bolt circle diameter and diameter of the holes.  In the case of an A type mount check the number of bolt circles (one for A2 and two for A1).  All chucks with a1 mount can be installed on a-1 spindle nose only.
All chucks with A2 mount can be installed on A1 or A2 spindle noses.

For the long taper spindle noses (Type L), check the pilot diameter, length and thread size.
For the threaded spindle noses, check the thread diameter, number of threads per inch and length, pilot diameter and length, plus overall length.
Click here for detailed spindle dimension drawings


Scroll Type Manual Chuck (Manual Actuated Self-Centering - available in 2-jaw, 2-3 jaw, 3-jaw, 4-jaw, and 6-jaw models)
A manual type lathe chuck is actuated by using a t-handle wrench inserted into the access holes on the outside diameter of the chuck.  When the t-handle wrench is inserted  into the actuating hole and turned clockwise it turns an internal scroll.  The actuation of the scroll in turn causes the jaws to move simultaneously with exactly the same amount of movement toward center.  If the t-wrench is turned counter clockwise the jaws move outward toward the outside of the chuck.  The manual chuck may be equipped with solid one piece jaws or 2 piece jaws with a removable top jaw.

Independent Jaw Chucks (Manual Actuated Not Self-Centering - available with 4-jaws)
An independent jaw chuck is designed with 4 jaws which may be moved independently of on another.  A t-handle wrench is used to actuate a screw on each jaw independently.  When the t-wrench in inserted into the end of a jaw screw and turned clockwise the jaw moves  to the center of the chuck.  These chucks may be used to center an irregular shaped work part or to position a work part off center by choice.   Independent chuck are available with solid one piece jaws or 2 piece jaws with a removable top jaw.

Combination Jaw Lathe Chucks (Manually actuated)
A combination chuck combines the scroll self-centering action of a scroll chuck with the independent jaw movement of an independent jaw chuck.  This chuck may be used as a scroll chuck and move all the jaws simultaneously or one jaw at a time.  Combination chucks are available with 2 piece jaws with a removable top jaw.


Standard Pull Back Collet Chucks
These collet chucks actuate the collet by pulling the collet back into a tapered spindle.  As the collet is pulled back, the tapered spindle causes the collet to close down to clamp the work part.  In this type of collet chuck there is no work part length control.  If the workpart size changes, the linear location of the part will change.  Available most popular collet configurations in manual and power actuated models.

Push type, Controlled Length Collet Chucks
These collet chucks maintain an accurate non-changing collet position.  If the work part outside diameter varies, there will be no linear variation in the work part.  A diameter size variation adaptation feature automatically controls the work part length even if work part diameter varies.  The collet is actuated by moving the collet or a sleeve forward to actuate the collet.  Available in most standard collet configurations in manual and power actuated models.

Multiple Position Collet Chucks
These collet chucks offer multiple clamping positions in one fixture.  They are available in most standard collet configurations in pull back or push type actuating features.  Available in most standard collet configurations in manual or power actuated models.

These precision collet chucks may be mounted directly to American Standard (A4, A5, A6, A8) and Camlock (D4, D5, D6, D8) style spindles or special fixtures. Collet chucks are also frequently used on cylindrical grinders, rotary tables, and many other machines.
Some collet chucks are available for other types of machines where a stationary non-moving situation is required. There are manually actuated, air actuated, and hydraulic actuated models. Just browse the choices below and choose the unit which is best for your application.


What is and expanding mandrel or expanding collet?

These expanding  mandrels and expanding mandrel collets are  high quality 5C expanding collets, 2J expanding collets, 16C expanding collets, B40 exapanding collets, B60 expanding collets, 3j expanding collets and other special sizes with diameter capacities of 3/8" to 6" and expandable lengths from 3/8" to 3".   They are designed for use with standard air collet or hydraulic cylinders or other collet fixtures. Expanding collets hold on the inside diameters or inside dimensions of workpieces.

The exanding collet provides an expanding member to locate and hold work from the inside, using your present 5C, 16C and 3J, B40, AND B60  equipment - lathes, milling machines, grinders, fixtures, etc. with no extra attachments. Accuracy within .0005 is not unusual on concentricity and the expanding collet enables you to hold close shoulder tolerances.
  • Requires no special adapters
  • Rigid one piece body construction
  • Actuated by machine draw tube or collet fixture
  • Available from 3/8 to 6 diameter
  • Available from 3/8 to 3 expandable length
  • Available in dead length designs
  • Special expanding collet configurations available
  • Internal collet chucking
  • Economical and accurate
How are the expanding collets used?
The expanding collet is inserted into the spindle of your machine and it's threaded draw bar until the 5c or 16c taper seats. The conventional movement of the draw bar will expand and release the clamping member.".

The  taper on the collet, once seated, on dead length collets there will be no variation of work part length if i.d. varies.  The expanding collet may be removed and replaced in a machine without affecting its accuracy as with any standard collet.  The expanding collet can operate with the spindle moving.

Expanding collets may be transferred to any machine using standard 5C, 16C,  3J, B40,or B60 collets.  Therefore, it may be switched from machine to machine for use in turning, grinding, machining, drilling, milling, etc., saving valuable time.


The pull type collet in one which is forcefully pulled back into a taper to create the clamping action.  The actuating taper is located in the spindle of the machine.  The collet is pulled back into the taper by a manual or power driven draw tube.  Examples:  5C, 16C, 2J, 3J, and many more.
The push type collet is one in which the collet body is held stationary as a power driven tapered sleeve moves foward to actuate the collet.  The tapered sleeve is normally air or hydraulically actuated.
Examples:  B42, B60, and many more.
Quick change collets are designed for rapid collet size change.  These collets reduce set up time by reducing the collet change time.  They normally require a change apparatus to facilitate the collet change procedure.
Collets which clamp on the outside diameter of a round, hex, or square work part.
Collets specifically designed to clamp on the inside diameter of a work part.

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