The F series and 5C collets intend to retain round stock material in a lathe, but several essential distinctions must consider. This blog composition will review the primary differences between the F series and 5Ccollets. About Collet, 16C Emergency is the assiduity standard for lathe and millwork. It handles spherical stock with a periphery of around 1 ′ ′( 25 mm). Without any problems, a 5c collet may give excellent concentricity to speed up setup over three jaw chucks. The 5C collets are handy and extensively available in metric and inch sizes.