18mm Bore to 20mm Step Arbor Reducer Flange – Precision 3.5mm Adapter for Grinding & Saw Blade Mounting

A precision-machined arbor reducer flange that adapts an 18mm bore wheel or blade to a 20mm step diameter spindle. With a 3.5mm step height and 7–8mm total adapter thickness, this flange provides extended axial engagement for wider wheels and blades requiring enhanced lateral support. Designed for bench grinders, lapidary machines, and diamond saw setups where bore-to-spindle mismatches require a reliable, vibration-free solution.

Specifications

Compatible Applications

• Grinding wheels — adapt 18mm bore wheels to 20mm spindle diameter on bench grinders
• Diamond saw blades — secure blade mounting where bore and spindle sizes differ
• Lapidary machines — compatible with standard lapidary bench grinders and combination machines
• Polishing and buffing setups — centered flange support for smooth, vibration-free operation
• Workshop saws — trim saws and slab saws with 20mm spindle and 18mm bore blades