Collection: Bolt-On Chuck Adapters

A bolt‑on lathe chuck adapter is a machined (or semi-machined) intermediary plate that lets you mount a larger lathe chuck onto a spindle designed for a smaller chuck. It bolts to the lathe spindle flange on one side, and to the chuck on the other.

SPINDLE FLANGE - Most mini lathes have an 80mm (3") spindle flange. HiTorque lathes usually have a 100mm (4") spindle flange. Our new 7600/7650 HiTorque Bench lathe has a 125mm (5") "locking" spindle flange.

REGISTRATION - All of our adapters are for Plain Back Chucks. Plain back chucks have standardized registration based on the size of the chuck. The correct adapter will have a registration recess (diameter) matching the spindle flange boss and a registration boss which matches the chuck's recess. Properly matching sizes ensures concentricity.

BOLT PATTERN - Similarly, plain back chucks generally have different bolt hole configurations depending on the type of chuck being mounted. 3 bolt holes (for a self-centering) or 4 holes (for independent) are used to secure the chuck to the adapter. A 6-hole spindle flange or adapter is designed to accommodate both types of chucks.

Visit Bolt on Lathe Chuck Adapter and Backplate Dimensions to view additional reference data.