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Description
Sherline 5/16" (.3125") WW Collet
Ensures high centering accuracy in lathes
Features a precise 3-jaw chuck design
Accommodates limited diameter range ±.001″
Maintains maximum runout of .002″ or less
Manufactured to standard WW specifications
The Sherline 5/16" (.3125") 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. A drawbar threads through the headstock into the collet's backside, drawing it into the adapter, which causes the jaws to close and securely grip the part for machining. Each collet size accommodates a limited range of diameters, approximately ±.001″ (.02mm).
WW collets are distinct from milling collets due to their through-hole design, allowing stock to pass entirely through up to a maximum diameter of 3/16″ or 4.5mm. Collets larger than this diameter, such as the 5/16" size, are referred to as "pot" chucks and are not bored through but only to a depth of .260″. These collets maintain a maximum runout of .002″ or less, provided the WW collet adapter is trued as per instructions, ensuring optimal performance.
Sherline collets are logically numbered, with inch sizes beginning with part number 1160 followed by two digits indicating the size in 64ths of an inch. 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.
