WW Collet to 5/8″ Adapter


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Product Description

About the Adjustable Tailstock Tool Holder


Held in the Adjustable Tailstock Tool Holder (not included), the collet adapter allows the use of WW (or 8 mm) collets in the lathe tailstock. Using collets in the tailstock means you can hold extremely small drills accurately on center. Drills of only a few thousandths of an inch can easily break if not perfectly centered. Complete instructions are provided with the adapter to help you “perfectly” align the headstock and tailstock of your Sherline lathe. When you consider the alternative of spending thousands of dollars for a jeweler’s lathe that is far less versatile, the time is well spent.

The WW collet to 5/8″ adapter holds Sherline WW collets with a shank diameter of .312-.313″. Other manufacturers make collets that vary in size up to .314-.315″. The 8.0 mm adapter is made to hold collets of that size. If your collets are not made by Sherline, measure them carefully to see which adapter you should use.

We also offer a collet adapter with a hex retaining cap (P/N 20871) for those who want to hold the collet adapter in our 5/8″ Gang-Tool Post mounted on our Chucker Lathe. The hex cap is more easily tightened using a 1″ hex wrench (P/N 65025) than the knurled cap can be by hand. Using a wrench allows you to tighten the retaining cap tight enough to keep the drill from moving or spinning in the collet when drilling into your part.

The improper use of machine tools and their accessories can result in serious injury. Before using this tool, thoroughly read the instructions and make sure you understand its proper and safe use.


Always wear safety glasses when operating machine tools.

Download PDF 2085 Instructions

Instructions PDF Download

Body and Retaining Ring Material 12L14 Steel
Body Coating Black oxide
Collet Capacity #2085: WW (.312-.313 in.), #2086: 8mm (.312-.313 in.)
Knurled Cap
Part No. Description Quantity
20880 Sherline WW Adapter Body (Inch) 1
20890 8mm WW Adapter Body (Metric) 1
20870 Knurled Retaining Cap 1
Hex Cap
Part No. Description Quantity
20880 Sherline WW Adapter Body (Inch) 1
20890 8mm WW Adapter Body (Metric) 1
20871 Hex Retaining Cap 1

Click the P/N below to download a zipped version of the IGS 3D CAD file. You will need to extract the zip file before viewing the IGS file.
2085(2086 metric) WW Collet Tailstock Adapter 3D IGS model
20870 Retaining Ring 3D IGS model
You need an IGS viewer to view .igs files. CLICK HERE to download a FREE IGS viewer.