Accusize Industrial Tools R8 to 20 mm Thread Adapter Shank for JSN20 2600-4022 Self-Reversing Tapping Head, 2600-4066

For connecting the Accusize self‑reversing tapping head 2600‑4022 to a machine spindle, the R8 to 20 mm threaded adapter shank provides a secure and accurate interface. The shank is machined from hardened and precision‑ground alloy steel, with a Jacobs‑style M20 thread ground to master gauges for accurate fit. The R8 taper (approx. 3.5 in per foot) used in milling machines and held by a drawbar ensures a reliable connection: it fits directly into the spindle without requiring additional adapters and provides stable retention during tapping operations. When paired with the self‑reversing tapping head, the adapter helps deliver controlled depth, chatter‑free operation and preset torque control. Suitable for machinists, maintenance professionals and engineers, this adapter supports light to medium duty tapping in steel, cast iron, aluminum and other common materials, and fits milling machines with R8 spindles(BridgePort) and Morse Taper spindles.

• R8 taper to 20 mm threaded mount (M20) connects the Accusize 2600‑4022 self‑reversing tapping head to Bridgeport and manual milling machines(Drawbar thread: 7/16"-20). The adapter fits directly into a R8 spindle and provides a secure 20 mm threaded interface for the tapping head.
• Built from hardened and precision‑ground alloy steel, the shank is machined to tight tolerances. Jacobs‑style threaded end is precision ground to master gauges for accurate alignment and fit with the tapping head.
• The R8 taper was developed for milling machines and is retained by a drawbar. Its taper provides stable retention in the spindle; the M20 thread offers a self‑holding connection to the tapping head.
• Designed for light to medium duty tapping, this adapter allows quick tool changes between drilling and tapping operations. Use it with self‑reversing tapping heads for controlled depth, chatter‑free tapping and adjustable torque.
• Ideal for machinists, maintenance professionals and engineers, the adapter enables accurate internal threading in steel, cast iron, aluminum and similar metals. Suitable for use on manual or CNC milling machines.