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The Sherline 7.3mm (.2874) WW Collet provides a precise and efficient method for mounting cylindrical parts or bar stock in a lathe, ensuring high centering accuracy. This collet functions as a small, precision 3-jaw chuck that fits into a specially designed tapered adapter within the headstock. The drawbar, threading through the headstock and into the collet's backside, pulls the collet into the adapter, causing the jaws to close and securely grip the part for machining. Each collet size accommodates a limited range of diameters, approximately ±.001″ (.02mm), ensuring precise part mounting.
WW collets are distinct from milling collets due to their through-hole design, allowing stock with a maximum diameter of 3/16″ or 4.5mm to pass entirely through. Collets larger than this diameter, known as "pot" chucks, are not bored through but are instead bored to a depth of .260″. This design may result in increased runout further from the collet's front, depending on the setup and part length.
Sherline collets are manufactured to standard WW specifications, with a shank diameter of .312-.313 and a .275-40 thread. They are not hardened and are designed to fit Sherline's specific drawbar and adapter. It is advisable to verify compatibility with WW collets from other manufacturers before purchase. Sherline offers a slightly larger adapter and drawbar set to accommodate some other brands of 8 mm collets.
1x Sherline 7.3mm (.2874) WW Collet
7.3 mm (0.2874")
ZIP Files
Maximum runout of .002″ or less
Collet sizes above 3/16″ (4.5mm) are considered pot chucks and are not bored through
Bored to a depth of .260″
Shank diameter of .312-.313
Thread size of .275-40
Manufactured to standard WW specifications
Metric sizes range from .3 mm to 8.0 mm in .1 mm increments
