Cup-Shaped Resin Abrasive Grinding Wheel 4"/5"/6" | Knife Sharpening

Cup-Shaped Resin Abrasive Grinding Wheel for Knife Sharpening & Polishing

Take your metalworking and sharpening projects to the next level with this professional-grade cup-shaped resin abrasive grinding wheel. Crafted from high-quality emery (resin bond), this grinding wheel delivers consistent, controlled material removal for a wide range of hard and brittle materials — from tungsten carbide and ceramics to precious stones and knife blades.

Key Features

• Three Size Options: Available in 4-inch (100mm), 5-inch (125mm), and 6-inch (150mm) diameters to suit your grinder or workbench setup.
• Multiple Grit Choices: Select from P80, P150, P240, or P320 — ranging from aggressive stock removal to fine finishing and polishing.
• Cup-Shaped Profile: The recessed cup design exposes the abrasive rim for precise edge work, knife sharpening, and face grinding on flat surfaces.
• High-Quality Emery Material: Resin-bonded emery construction provides durability, consistent grit exposure, and excellent cutting performance.
• Wide Compatibility: Suitable for angle grinders and bench grinders with a standard 32mm bore.
• Customizable: Available in custom configurations to meet specific workshop requirements.

Specifications

Size Reference

• 4 inch: 100(D) × 32(T) × 20(H) × 10(W) × 3(X) mm
• 5 inch: 125(D) × 32(T) × 32(H) × 10(W) × 3(X) mm
• 6 inch: 150(D) × 32(T) × 32(H) × 10(W) × 3(X) mm

Applications

This versatile grinding wheel is ideal for grinding and polishing a broad spectrum of hard and brittle materials, including:

• Tungsten carbide tools & inserts
• Glass, ceramics & ferrite
• Semiconductors & electrical carbon products
• Precious stones & gemstones
• Refractory & magnetic materials
• Iridium alloy components
• Knife blades & cutting tools

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Learn more: OSHA guidance on hand and power tools

Frequently Asked Questions

Q: What grinder is this cup-shaped resin abrasive grinding wheel compatible with?

A: This grinding wheel features a 32mm bore and is compatible with most standard bench grinders and angle grinders that accept 4-inch (100mm), 5-inch (125mm), or 6-inch (150mm) wheels. Always verify your grinder's spindle size and maximum RPM rating before mounting.

Q: Which grit size should I choose for knife sharpening?

A: For initial blade shaping or removing significant material, P80 or P150 is recommended. For refining the edge and achieving a smoother finish, P240 or P320 is ideal. Many users start with a coarser grit and work progressively to a finer one for best results.

Q: Can this grinding wheel be used on glass and ceramics?

A: Yes. The resin-bonded emery construction makes this wheel well-suited for grinding and polishing hard, brittle materials including glass, ceramics, ferrite, and precious stones, in addition to metallic materials like tungsten carbide and iridium alloy.

Q: Is this grinding wheel customizable?

A: Yes, customization is available. If you require specific dimensions or grit combinations beyond the standard options listed, custom configurations can be arranged.

Production & Packaging Notice

To maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.