20mm Bore to 32mm Step Arbor Reducer Flange – Precision 1.5mm Adapter for Grinding & Saw Blade Mounting

A precision-machined arbor reducer flange that adapts a 10mm bore wheel or blade to a 12.7mm (1/2") step diameter spindle. With a 1.5mm step height and 4–5mm total adapter thickness, this low-profile flange provides a stable, centered clamping surface for setups requiring minimal axial offset. 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 10mm bore wheels to 12.7mm (1/2") 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 1/2" spindle and 10mm bore blades

Related Tools

• Machine Accessories — Full range of arbor flanges, adapters, backing plates, and spacers
• Saw Blade Arbor Adapters — Bore conversion adapters for trim saws and slab saws
• Bench Wheel Spacers — Stainless steel and aluminium spacer sets for wheel alignment
• Diamond Grinding Wheels — Full range of diamond wheels for lapidary bench grinders
• Diamond Saw Blades — Precision diamond blades for lapidary and stone cutting

Frequently Asked Questions

• Q: What does an arbor reducer flange do?
  A: An arbor reducer flange fills the gap between a wheel or blade bore and the machine spindle diameter. This flange adapts a 10mm bore wheel to a 12.7mm (1/2") spindle, ensuring the wheel is centered and clamped securely with no wobble or runout. The 1.5mm step height and 4–5mm total thickness provide correct axial positioning for setups requiring minimal offset.
• Q: Is this flange compatible with my bench grinder or saw?
  A: This flange is designed for machines with a 12.7mm (1/2") spindle diameter where the wheel or blade has a 10mm bore. Verify both your machine spindle OD and your wheel/blade bore before ordering. For other size combinations, see our full range of arbor reducer flanges.
• Q: What is the difference between 1.5mm and 3.5mm step height?
  A: The step height determines how deep the flange seats into the wheel bore. A 1.5mm step is a low-profile option suited for setups where minimal axial offset is required or where wheel bore depth is shallow. A 3.5mm step provides deeper engagement for additional stability. Choose based on your wheel bore depth and machine guard clearance.
• Q: Is this listing for a single flange or a set?
  A: This listing is for a single arbor reducer flange. If your setup requires flanges on both sides of the wheel, order two units.