20mm Bore to 25.4mm Step Arbor Reducer Flange – Precision 1.5mm Adapter for Grinding & Saw Blade Mounting

A precision-machined arbor washer flange designed to secure buffing, polishing, and grinding wheels onto bench grinder spindles. With a 20mm outer diameter, 10mm bore, and 4mm step height, this flange provides a stable, centered clamping surface that prevents wheel slippage and reduces vibration during operation. An essential small-part upgrade for lapidary professionals, jewelers, and workshop users who demand consistent, safe wheel mounting.

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Specifications

Compatible Applications

• Buffing wheels — secure clamping flange for cotton, sisal, and felt buffing wheels on bench grinders
• Polishing wheels — stable mounting for lapidary and jewelry polishing setups
• Grinding wheels — centered support flange for light grinding and sharpening wheels
• Lapidary machines — compatible with standard 10mm spindle bench grinders and combination machines
• Workshop polishers — suitable for bench-mounted polishing motors with 10mm arbor shafts

Related Tools

• Machine Accessories — Full range of arbor adapters, flanges, backing plates, and spacers
• Bench Wheel Spacers — Stainless steel and aluminium spacer sets for precise wheel alignment
• Saw Blade Arbor Adapters — Bore conversion adapters for trim saws and slab saws
• Diamond Grinding Wheels — Full range of diamond wheels for lapidary bench grinders
• Polishing Wheels & Pads — Buffing and polishing wheels for gemstone and metal finishing

Frequently Asked Questions

• Q: What is an arbor washer flange and why do I need one?
  A: An arbor washer flange is a precision-machined clamping disc that sits between the spindle nut and the grinding or buffing wheel. It distributes clamping force evenly across the wheel face, preventing slippage, reducing vibration, and protecting the wheel bore from damage. The 4mm step height on this flange ensures the wheel is centered and held securely on the spindle.
• Q: What spindle size does this flange fit?
  A: This arbor washer flange is designed for bench grinder and polisher spindles with a 10mm shaft diameter. Verify your machine's spindle size before ordering. For other spindle sizes, see our full range of machine accessories.
• Q: Is this flange compatible with both buffing and grinding wheels?
  A: Yes — this flange is suitable for buffing, polishing, and light grinding wheels mounted on 10mm spindle bench grinders. For heavy-duty abrasive grinding, always confirm your wheel's maximum RPM rating matches your machine's operating speed.
• Q: Do I need a matching flange on both sides of the wheel?
  A: For most bench grinder setups, a flange is used on both sides of the wheel (inner and outer) to ensure balanced clamping. Check your machine's existing hardware and order accordingly. This listing is for a single flange.