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Your cart is empty.This 8-inch diamond flat lap disc features a 80 grit finish that delivers an ultra-smooth, highly polished surface. The 1/2-inch arbor makes it compatible with most grinding and polishing machines. Ideal for shaping, grinding, sanding and lapping a variety of materials including gemstones, glass, ceramics and more, it efficiently removes material while maintaining an even, flat surface. The diamond grit particles cut quickly and precisely for fast stock removal without risk of overheating or damaging delicate workpieces. Cleanup is simple, as swarf wipes away easily. Whether you need to flatten, contour or refine edges, this durable lap wheel handles the task efficiently and delivers a blemish-free, mirror-like finish every time.
Jas0nB0rne
July 10, 2025
no issues using this at 4500 rpm on my home made lapidary machine
BJD
July 7, 2025
they don't last as long as name brand discs but for the price I can buy 3 of these for the same price as the name brand, so it's a better deal.
Kelly D
July 6, 2025
I was nervous about the quality of these discs based on the price but I was pleasantly surprised. I use the discs to lap stones and have purchased 320, 500, 1500 grits. The diamond spread is even, the cutting speed is fast, and the final result is spot on. I came back and bought backups too!
Audrey Williams
May 12, 2025
Fast delivery
Bill M
January 12, 2025
This 8 inch diamond lap discs look decent enough and should work well on my lapping machine although I plan to use it for rough grinding facets on engraving tools, which I discovered the quick change tool holders fit perfectly in the faceting manipulator arm on my dad’s old gem faceting machine. And that eliminates the need to buy an over priced angle guide set. I can set the angles on the faceting arm and let the machine and these diamond lap discs do the rest.The main negative factor I see with this disc (which I’ve noticed with others as well) is the fact that there are no markings on the disc to identify the grit. With this being the coarsest disc I have at 240 grit it won’t be easy to get mixed up with other discs. However, I would suggest marking the backs of them as soon as you take them out of the packets to ensure no mix-ups in grit sizes, especially if you store your discs in a index rack.The price on these discs are really good compared to some I’ve seen and will likely last just as long as any other bonded disc. The disc I received has a washer impression around the arbor that looks as though it had been used and it rusting, but the grinding surface looks unused. So I’m not sure if the impression is from the manufacturing process or something else. Seems to be common as even the images in the listing have similar markings.
Dovetailed
November 19, 2024
Not surprisingly, like many diamond sharpening implements, I found this wheel needed some breaking-in before it cut cleanly and uniformly. I think most manufacturers ship diamond cutters fresh out of the plating tank, which leaves a small fraction of poorly adhered diamonds right on the surface, inadequately captured by the plating. I used a piece of tool steel to "dress" the wheel after finding the initial grind a bit coarse and uneven. The finish was much improved after a half dozen passes across the full radius with the tempered shaft of a broken HSS endmill. After that, the wheel has done a good job sharpening a couple of carbide circular saw blades and a carbide boring bar without noticeable degradation.
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