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• Sherline 4.9mm (.1929) WW Collet
• Offers precise centering for cylindrical parts
• Fits into a specially designed tapered adapter
• Allows stock up to 4.5mm to pass through
• Ensures maximum runout of .002 inches or less
• Manufactured to standard WW specifications

The Sherline 4.9mm (.1929) WW Collet offers 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 its jaws to close and securely grip the part to be machined. Each collet size accommodates a limited range of diameters, approximately ±.001″ (.02mm), providing an accurate part mounting system.

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 are known as "pot" chucks and are not bored through, being only .260″ deep. The collet's maximum runout is .002″ or less, and when the WW collet adapter is properly trued, it ensures optimal runout performance.

Sherline collets are logically numbered, with metric collets beginning with part number 1178 followed by two digits indicating the size in 0.1 mm increments. These collets are manufactured to standard WW specifications, with a shank diameter of .312-.313 and a .275-40 thread, though they are not hardened. It is crucial to verify compatibility with other manufacturers' WW collets to ensure they fit the Sherline adapter.