This 22mm to 12mm Grinding Wheel Bore Adapter Kit is engineered for precise arbor-hole conversion while maintaining optimal balance, concentricity, and operational safety. Manufactured from high-strength aluminum alloy, the reducer bushings deliver excellent durability, heat resistance, and dimensional accuracy, ensuring stable performance even under high-RPM grinding conditions.

You may choose from four precision-machined sizes:

1. Φ22 (small end) × Φ40 (large end) | Inner bore Φ12 | Total length 15mm

2. Φ22 (small end) × Φ40 (large end) | Inner bore Φ12 | Total length 20mm

3. Φ22 (small end) × Φ40 (large end) | Inner bore Φ12 | Total length 25mm

4. Φ22 (small end) × Φ40 (large end) | Inner bore Φ12 | Total length 45mm

These options allow you to select the exact length needed for differentgrindingwheel or spindle setups.

Hex Socket Screws (Right / Reverse Thread):

• M10 Right-Hand / Left-Hand (Reverse) Thread
• M12 Right-Hand Thread

These locking screws prevent loosening during high-RPM operation and ensure maximum safety.

Thickened Spacer / Washer Plate Options:

1. Φ37 Outer Diameter × Φ13 Inner Hole × 3mm Thickness
2. Φ40 Outer Diameter × Φ12 Inner Hole × 4.5mm Thickness
3. Φ50 Outer Diameter × Φ12 Inner Hole × 4.5mm Thickness

These heavy-duty spacers increase support area, improve wheel balance, and help achieve stable installation.

Complete Kit Includes:

• 22mm → 12mm aluminum reducer bushing (precision machined, multiple length options)
• Hex socket locking Screw (M10 RH/LH or M12 RH)
• Thickened Spacer / Washer Plate (three size options)

Perfect for mounting grinding wheels, cutting discs, sanding wheels, and diamond grinding wheels with larger bore sizes onto smaller-arbor tools. Ensures stable centering, reduced vibration, and improved safety during high-speed operation.

⭐ Key Features

• Accurate Size Conversion: Converts wheel inner bore from 22mm to 12mm
• High-Quality Aluminum Construction: Lightweight, strong, corrosion-resistant
• Reverse-Thread Safety Screw: Prevents loosening during rotation
• Thickened Spacer Options: Improves balance, support, and installation stability
• Multiple Length Choices: Fits different wheel structures and mounting depths
• Wide Compatibility: Works with angle grinders, bench grinders, polishing tools, and more
• Versatile Wheel Support: Resin wheels, diamond wheels, cup wheels, flat wheels,