What are the types and specifications of oilstones?
2 Answers
Oilstones are classified into the following types and specifications: Types of oilstones: WA white oilstone, WA+Cr2O3 oilstone, sulfur-impregnated oilstone, graphite oilstone, ruby oilstone, GC (green silicon carbide oilstone), CBN (cubic boron nitride oilstone), CVD (diamond oilstone), SC (cubic silicon carbide oilstone). Hardness of oilstones: The hardness of the oilstone should be selected based on the hardness of the material being processed. For harder materials, use a lower hardness oilstone; for softer materials, use a higher hardness oilstone. Common hardness grades include: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, -5, -15, -25, -35, -50; sulfur-impregnated oilstones have hardness grades of: -10, -30, -50, -60, -80, -100, -110.
When I first started learning about car maintenance, I was also completely confused about oil stones. Actually, oil stones are grinding tools, similar to sandpaper, mainly categorized by model and specifications. First, let's talk about materials: common types include aluminum oxide oil stones, silicon carbide oil stones, and diamond oil stones, which are highly wear-resistant but more expensive. In terms of specifications, grit size is key—coarser grits like 800 are suitable for removing large burrs, while finer grits like 2000 can polish cylinder surfaces precisely. Shape is also important: bar-shaped ones fit narrow gaps, cylindrical ones target small holes, and plate-shaped ones are for flat surfaces. As for dimensions, lengths of 10-20 cm are most common, widths vary between 1-3 cm, and thicknesses are typically around 0.5-1 cm. When choosing, consider what parts you're grinding—for example, fine grit is better for engine piston rings to avoid scratches. Don’t buy the cheapest ones, as quality can be inconsistent and may damage parts. I recommend beginners start with a multi-grit set—affordable and practical.
