DAPRA AM138-TC068 Tapping Chuck Holder

The DAPRA AM138-TC068 Tapping Chuck Holder is a precision tapping-tool accessory designed to mount a tapping chuck in a machine-tool spindle for threaded-hole production on CNC mills and machining centers. Marketed as AM138-TC068 (also listed as AM138-TCO68), it uses a TC-type interface—TC stands for Tap Collets in Showa’s cataloging scheme—indicating its role as a dedicated tapping-holder configuration within Showa’s tapping system. As part of Showa’s AM138 family, this holder is built to deliver consistent concentricity and rigid retention, essential for accurate thread cutting and reliable tool life when used with compatible tapping chucks. The AM138-TC068 designation signals a specific size/interface combination within the AM138 line, which buyers commonly select to ensure interchangeability with other AM138 components and with Showa’s TC-based tapping solutions. In practical terms, users pair this holder with tapping tools to achieve controlled feed and alignment during threaded-hole production, helping maintain thread quality across repeated cycles in production environments. This model’s presence in catalogs and listings under the AM138-TC068/AM138-TCO68 family confirms its purpose as a dedicated tapping-chuck carrier within precision machining setups used for high-speed tapping operations.