3C Step Collet

The 3C Step Collet features a 2″ diameter and 1″ depth, making it an excellent addition for machinists using the Sherline 3C headstock. It can be easily machined to size and is specifically designed to hold larger workpieces.

A 1/4″ (6.35 mm) dowel pin is included to provide a gripping surface during the boring process. This helps minimize runout and ensures greater accuracy in the finished bore. Once machined to the desired diameter and depth, the collet effectively becomes a custom chuck—ideal for parts too large for standard 3C collets.

Other head sizes may be available. Please contact Sherline for additional options and pricing.

NOTE: This step collet is designed to grip material only at the face end, not through the collet. Maximum gripping depth is approximately 3/4″ to 7/8″ (19.05 mm to 22.23 mm).

Contact us to inquire about other available step collet head sizes.

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Individual WW Collets

Collets offer a fast and accurate way to mount cylindrical parts or bar stock in a lathe. Each collet functions like a miniature precision 3-jaw chuck and fits into a tapered adapter mounted in the headstock. A drawbar passes through the headstock and threads into the rear of the collet, pulling it into the adapter. This action causes the collet jaws to close and securely grip the workpiece. Collets are known for their exceptional centering accuracy, but each collet size accommodates only a limited diameter range—typically ±.001" (0.02 mm).

WW Collets vs. Milling Collets

Unlike milling collets, WW collets feature a through-hole, allowing material to pass completely through both the collet and drawbar. The maximum diameter stock that can pass through is 3/16" (4.5 mm), although WW collets are available in sizes up to 5/16" (8.0 mm). Collets larger than the through-hole capacity are sometimes referred to as “pot chucks,” as they are only bored to a depth of approximately .260".

Collet Accuracy

Sherline WW collets are precision-made and have a maximum runout of .002" or less. When the WW collet adapter is properly trued as recommended in the instructions, runout is minimized, providing optimal accuracy. Pot chucks (collets larger than 3/16" or 4.5 mm) are not bored through and may exhibit increased runout if your part extends far beyond the front of the collet.

Logical Part Numbering

Sherline collets are organized by size for easy identification:

  • Inch Collets: Part numbers begin with 1160, followed by two digits representing the size in 64ths of an inch.

    • Example: P/N 116013 is 13/64"; P/N 116016 is 1/4" (16/64").

  • Metric Collets: Part numbers begin with 1178, followed by two digits representing the size in 0.1 mm increments.

    • Example: P/N 117813 is 1.3 mm.

Compatibility and Specifications

Sherline WW collets are manufactured in-house to standard WW specifications but are not hardened. The shank diameter is .312–.313", and the thread is .275-40. While some third-party WW collets may not fit properly, Sherline offers an optional .315" adapter and drawbar set (P/N 1163) to accommodate select 8 mm collets from other manufacturers.

Available Sizes

Sherline WW collets are offered in:

  • Inch sizes from 1/64" to 5/16", in 64th-inch increments.

  • Metric sizes from 0.3 mm to 8.0 mm, in 0.1 mm increments.

Special inch sizes up to .320" can be custom ordered with approximately a 3-week lead time. Please contact us for details.

Quck Order

If you are ordering a lot of different size collets please use the quick order table below to make it easier!

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2100-2102 WW Collet Pot Chucks
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1160 WW Collet Set
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View For Pricing  Select options This product has multiple variants. The options may be chosen on the product page