Choosing a diamond cutting disc comes down to three things: the material you cut, the machine you fit it to, and the rim type. Diamdisc makes diamond blades and discs from 105 mm to 300 mm in our HOWOLL factory in Linyi, Shandong, and supplies importers, wholesalers and tool brands in the UK, Europe, Australia and the Middle East. No retail, no minimum order under 300 pieces per model, and every blade is laser-marked with its real speed rating.
Choose a diamond blade by material
A diamond blade does not cut by sharpness. It grinds its way through the material with diamond grit held in a metal bond, and the bond has to wear at the same rate as the diamond. That is why a blade built for concrete glazes over on porcelain, and a porcelain blade wears out fast on engineering brick. We sort our range by what you cut.
Tile & porcelain cutting discs
Thin turbo and continuous-rim discs, 105–230 mm, with a soft bond and fine grit for porcelain, ceramic and 20 mm porcelain paving. Our best-selling line and the one UK tilers ask about most.
Concrete & masonry cutting discs
Segmented and turbo blades, 115–300 mm, plus wall chaser blades. For concrete, blocks, brick, paving flags and backer board on angle grinders and cut-off saws.
Granite & stone cutting blades
Continuous-rim blades for marble and polished stone, segmented and turbo blades for granite worktops, sandstone and quartz. Wet or dry versions.
Diamond grinding discs & cup wheels
Single-row, double-row and turbo cup wheels, 100–180 mm, M14 or 22.23 mm bore. For levelling concrete, removing tile adhesive and screed, and grinding stone edges.
Which size fits your machine?
UK users name the grinder in inches and the disc in millimetres, so an angle grinder diamond blade for a 4½-inch grinder is a 115 mm disc, and a 9-inch grinder takes 230 mm. The bore must match the spindle: 22.23 mm (7/8″) for most grinders, 25.4 mm for many saws, and 20 mm for some tile saws. The maximum speed below is calculated from the EN 13236 peripheral speed limits of 80 m/s for hand-held blades up to 230 mm and 100 m/s above that. The figure marked on each of our blades comes from the factory test record for that model.
| Blade diameter | Machine | Usual bore | Max speed (calculated) |
|---|---|---|---|
| 105 / 115 mm (4 / 4½”) | 115 mm angle grinder | 22.23 mm | 80 m/s · 13,200 rpm |
| 125 mm (5″) | 125 mm angle grinder | 22.23 mm | 80 m/s · 12,200 rpm |
| 180 mm (7″) | 180 mm grinder, wet tile saw | 22.23 / 25.4 mm | 80 m/s · 8,400 rpm |
| 230 mm (9″) | 230 mm angle grinder | 22.23 mm | 80 m/s · 6,600 rpm |
| 300 mm (12″) | Petrol cut-off saw, bench saw | 20 / 25.4 mm | 100 m/s · 6,300 rpm |
Turbo, segmented or continuous rim?
The rim is the part of a diamond disc that does the work, and the three common designs trade speed against finish.
- Continuous rim. One unbroken diamond edge. Slowest cut, cleanest edge, runs cool with water. The choice for marble, glazed ceramic and polished porcelain where chipping shows.
- Turbo rim. A continuous edge with a serrated or waved pattern that clears dust and cuts faster. The all-rounder for porcelain, granite and hard concrete, and the design used in our 115 mm tile disc.
- Segmented rim. Separate segments with gullets between them. Fastest cut and best cooling when dry, with a rougher edge. Built for concrete, block, brick and paving flags.
Two numbers matter more than the rim name on a spec sheet: rim thickness, which sets the kerf width and how much a tile edge chips, and segment height, which sets how long the blade lasts. Fewer than half of the UK product pages we surveyed state segment height, and fewer than a quarter state maximum speed. We print both on every model.
Why buy diamond saw blades direct from our factory
- Two bonding processes. Hot-pressed sintered blades for tile and stone, laser-welded segments for concrete and dry cutting. We tell you which process each model uses, because it decides whether the blade can run dry.
- Full specification on every blade. Diameter, bore, rim thickness, segment height, maximum speed in m/s and rpm, wet or dry, and the materials it is built for.
- Importer-friendly terms. Minimum order 300 pieces per standard model, 1,000 for custom specifications. Samples of standard models are free; you cover the freight.
- Private label at no extra cost. Laser-etched logo on the steel core is free. Printed boxes and blister cards are available with their own minimums.
- Lead time you can plan around. Standard models ship in 15–25 days, custom models in 25–35 days. Payment 30% deposit, 70% against the bill of lading copy.
- Export paperwork done. HS code advice, certificate of origin, packing list, and packaging printed with your importer details and batch code as the UK and EU General Product Safety Regulations require.
Popular sizes
- 115 mm turbo porcelain tile cutting disc, the 4½-inch grinder disc that makes up most of our export volume
- 125 mm diamond tile cutting disc for 5-inch grinders
- 230 mm segmented diamond blade for concrete and masonry on 9-inch grinders
- 300 mm diamond blade for petrol cut-off saws and bench saws
Diamond blade FAQ
What bore size do I need: 22.23, 25.4 or 20 mm?
Match the bore to the machine spindle. Almost all angle grinders in the UK take 22.23 mm (7/8″). Many bench and cut-off saws take 25.4 mm (1″), and some tile saws take 20 mm. We supply 22.23 mm discs with a 20 mm reducer ring on request, and can make 25.4 mm bores for any model.
What does EN 13236 mean on a diamond blade?
EN 13236 is the European safety standard for diamond and cBN tools. A blade carrying the mark must show nine items including maximum operating speed in m/s, maximum rpm, direction of rotation, dimensions, the maker’s name and a traceability code. It is not a quality grade, it is a safety declaration backed by burst-speed testing. Diamond blades do not carry CE or UKCA marks.
Can I use a diamond cutting disc dry on an angle grinder?
Only if the blade is marked for dry use. Laser-welded segmented and turbo blades are designed to run dry with intermittent cuts to let the blade cool. Continuous-rim blades for porcelain and marble cut best wet. Dry cutting concrete or stone releases silica dust, so UK sites use water suppression or an M-class extractor with an FFP3 mask.
What is the maximum RPM for a 115 mm or 230 mm diamond blade?
At the 80 m/s limit for hand-held blades, a 115 mm disc is rated about 13,200 rpm and a 230 mm disc about 6,600 rpm. Always use the rpm marked on the blade, and never fit a blade rated below the no-load speed of the grinder.
What is your minimum order for diamond blades?
300 pieces per standard model, which can be split across diameters within the same line. Custom specifications start at 1,000 pieces. One trial carton is possible for a first order after samples are approved.
Do you make private-label diamond blades?
Yes. We laser-etch your brand on the steel core at no charge and can print boxes and blister cards to your artwork. Send your logo and target spec through the quote form and we reply with a drawing and price within two working days.
Get a factory quote
Tell us the diameter, material and quantity, or send the spec sheet of the blade you buy today. Eric Li replies within two working days with price, lead time and a sample plan. Email [email protected] or use the form.