20mm Bore to 25mm Step Arbor Reducer Flange – Precision 1.5mm Adapter for Grinding & Saw Blade Mounting

A precision-machined arbor reducer flange that adapts a 20mm bore wheel or blade to a 32mm 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 20mm bore wheels to 32mm 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 32mm spindle and 20mm 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 20mm bore wheel to a 32mm 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 32mm spindle diameter where the wheel or blade has a 20mm 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.