Steiner AF-103437 Flywheel Autofacer

Steiner AF-103437 Flywheel Autofacer is an automatic back counterboring tool designed to machine circular features on the back side of a through-hole in a single setup. Based on Steiner’s flywheel-activated Autofacer platform, it uses inertia generated during rapid spindle acceleration to open and close the cutting blade, enabling reliable back counterboring and back spotfacing while the cutter remains fully supported in the pilot hole. The AF-103437 supports inch and metric Weldon shanks and is compatible with standard machine spindles, with a built-in shear-pin safety device to protect the tool, workpiece, and spindle from overload. Typical counterbore ranges for Autofacers span 9.5 mm to 33 mm (0.375 in to 1.299 in), depending on configuration. Steiner notes that stock Autofacers are available for quick delivery and that the Autofacer line originated with Steiner in 1968 as the OEM, underscoring a long track record in automatic back boring technology. The AF-103437 model is part of this lineage, engineered to reach through holes and automatically create precise back features without manual blade actuation, making it suitable for applications requiring back-counterboring and back spotfacing on complex assemblies where through-hole operations are required.