These extended pin jaws are specifically designed for laser marking operations that require holding parts with outer diameters up to 6" (153 mm) and inner diameters as small as 0.66" (16.7 mm), using Sherline 3-jaw chucks manufactured after 2014*. Each top jaw features four holes for 3/16" hard-steel dowel pins (not included) and mounts to the master jaws using a socket head cap screw (not included).

These jaws are intended for light-duty holding only and are not suitable for machining or any application requiring more than finger-tight clamping force. They are ideal for securely holding round parts—either internally or externally—during laser marking.

Compatible with all Sherline 3-jaw chucks.

*NOTE: Chucks manufactured before 2014 require custom fitting of each jaw. You may either send your chuck to Sherline for modification or measure the width of each jaw (A, B, and C) using micrometers and submit the measurements for proper fitting.