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Since 1958, Dunham Tool has designed and manufactured innovative, high quality and high accuracy workholding, toolholding and spindle solutions for manufacturing industries worldwide. |
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Dunham Expanding Collets:
5C, 16C, 3J Systems:
Lathes, Grinders, Special Machines: Dunham Tool's Expanding Collets are designed for holding workpieces on their inside diameters for a variety of operations on Lathes, Cylindrical Grinders, Polishing Machines and many Special Machining, Laser Joining and Assembly Machines. Please see below for Dunham CAD Layout and Assembly Drawings detailing the complete range of Dunham 5C, 16C and 3J Expanding Collets.
 | | Dunham 3J Expanding Collet |
Dunham Collets are designed for use with all standard 5C, 16C and 3J Collet Chucks, Spindles, etc. By design, Dunham Expanding Collets are a 'true length' or 'dead length' workholding tool because the Collet's male taper remains fixed on the Collet Chuck's female taper, which permits exceptionally accurate and repeatable control of the workpiece location.
We manufacture Dunham Expanding Collets in 29 standard sizes to accomodate workpiece diameters ranging from 1/4" to 6" and workpiece lengths up to 3". Dunham Collets are designed to be 'finish machined' by the end user on their machine(s), assuring that the Dunham Expanding Collet is optimally matched (TIR) for maximum concentricity relative to the end user's spindle. While 'finish machining' by the end user yields maximum accuracies (and cost savings), Dunham will also machine the collet to the customer's specifications.
Dunham Expanding Collets were originally designed in 1958 by our founder, Russell Dunham, and we were awarded a patent for his design in 1959.
 | | Dunham Expanding Collet Size Chart |
 | | Dunham Expanding Collet Assembly Drawing |
Dunham Expanding Collets are one of a wide range of Dunham workholding and spindle devices: 50M Spindle Headstocks, Cartridge Spindles, Collet Chucks, Collet and Chuck Actuators and Cylinders, machineable Expanding Mandrels, Bar Puller Systems, as well as 5C, 16C, and 3J 'Plug and Play'
Collet Chucking Systems for all Lathes, Rotary Tables, Grinding Machines and Special Machines, Thru Hole and
No Thru Hole Kits available:
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Dunham Collet Chucks:
Drawtube Style:
5C, 16C, 3J:
Other Sizes Available |
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The Dunham Expanding Collets are one of a wide range of Dunham Workholding and Spindle solutions:
50M Precision Spindles:
Collet Chucks:
Collet and Chuck Actuators/Cylinders: machineable
Expanding Mandrels:
Bar Puller Systems
5C, 16C, and 3J
'Plug and Play'
Collet Chucking Systems for all Lathes, Rotary Tables, Grinding Machines and Special Machines:
Thru Hole and
No Thru Hole Kits available:
 | | Dunham Bar Pull System: 3/16" to 2 1/2" Diameters: 3MM to 34MM Diameters: |
 | | Dunham Model 50M Spindle, Pulley and Air Collet Closer |
Please call or email us for any additional technical information or applications assistance that you may need. You will receive immediate and complete assistance. All Dunham products are designed and manufactured in the USA. |
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