40mm Arbor Reducer Ring for 12.7mm Shaft | Grinding Wheel Adapter 3.5mm Step

This 40mm arbor reducer ring is designed for converting multiple shaft sizes to fit diamond blades, cutting discs, and grinding wheels.

Compatible with shaft sizes 10mm, 12.7mm (1/2"), 16mm, 18mm, and 20mm, this precision-machined reducer ring allows conversion to common bore sizes including 22.2mm, 25mm, 25.4mm (1"), 30mm, and 32mm.

The ring features a flat side and a hub (step) side for accurate positioning and stable mounting. Available in two step heights:

• 1.5mm step – ideal for cutting discs
• 3.5mm step – ideal for grinding wheels

Key Features:

• OD 40mm universal size
• Multi-shaft compatibility (10–20mm)
• High concentricity for reduced vibration
• Flat + hub design for secure fit
• Durable alloy steel construction

Applications:

• Diamond saw blades
• Cutting discs
• Grinding wheels
• Lapidary & stone processing tools