Jacobs NO.3B Lathe Chuck

Jacobs No. 3B lathe chuck — a Jacobs drill-lathe chuck in the No. 3B size class with a taper-cap mounting. The product labeling identifies a taper cap configuration, aligning with Jacobs-taper arbors and spindle interfaces for quick, repeatable setup. It is designed to hold small drill bits or workpieces during light turning and drilling operations on compatible lathes. Common applications include hobby machining and small-batch metalworking where a reliable Jacobs chuck provides precise centering and secure grip on the workpiece. This No. 3B variant is part of Jacobs' trusted range of drill-lathe chucks, built to endure regular shop use and maintain alignment across mounting changes.