The best 230mm diamond cutting discs, compared.
Top pick: Bosch EXPERT diamond cutting disc – Highest score, on stars and a stated 15 mm edge: 4.8 from 486 reviews at £84.43. The life claim is Bosch’s comparison, and the materials field says metal. Best value: TopsTools TTDS230 – Lowest shelf price in the joint top score band, at £8.99, with 4.6 from 263 reviews. One review lost a chunk of rim after three tile pavers. Updated October 2026.
A 230 mm diamond cutting disc is a steel wheel with a diamond rim for a large angle grinder or a compatible cut-off saw. UK shoppers also call it a 9 inch diamond blade. People buy one to cut concrete, brick, block paving, kerbs and patio slabs. A better listing, shows a 22.23 mm bore, a rim that matches the material, an EN 13236 mark where the page actually states it, and a segment height taken from the bullets rathemazon’s thickness field. Two cheap discs have UK reviews that describe pieces leaving the rim. The disc belongs on a machine rated for 230 mm, with the guard on. Concrete, brick, mortar and stone make respirable crystalline silica. The checks are on the [230mm diamond cutting disc buying guide](/hub/sanders/230mm-diamond-cutting-disc/sub/230mm-diamond-cutting-disc-buying-guide). Do not move the guard to fit it to a smaller machine. Is the usual spindle thread, not the hole.
A 230 mm diamond cutting disc is a steel wheel with a diamond rim for a large angle grinder or a compatible cut-off saw. UK shoppers also call it a 9 inch diamond blade.
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Personal buying guide
Question 1 of 2
How much masonry are you cutting?
The Bosch EXPERT disc, part 2608900663, is £84.43, with a 22.23 mm bore and a listing weight of 730 g. The scope line reads 230 x 22.23 x 2.4 x 15 mm, and the bullets say it lasts up to four times longer than Bosch 2608615031, the £11.99 universal disc in this set. That multiple is Bosch’s comparison, not a test we ran. The highlight names concrete and reinforced concrete, while the materials field says metal. The star line is 4.8 from 486 reviews, the highest stars in this table, and only five reviews were in the file. All five praise brick, block, paving slabs and a disc left on a Makita 9 inch grinder, and none of them is a complaint. An EN 13236 mark is not stated. The score leads this table on those stars and the stated 15 mm edge, with the price and the untested life claim kept in view.
Pros
Cons
Best for: Regular brick, block and slab cutting where you accept a maker’s life claim and a high shelf price.
Less suitable: One patio, or a steel cut based on the materials field.
Specifications
Common questions
Will this Bosch disc fit a 230 mm angle grinder?
The listing targets 230 mm tools with bore 22.23 mm (also 22.2 mm in some lines). Check the arrow direction and the guard before the first cut.
What materials does the listing name?
The materials field says metal. The highlight says concrete and reinforced concrete. Do not resolve that clash by cutting steel.
How is it rated on amazon.co.uk?
The raw listing shows 4.8 out of 5 from 486 reviews at £84.43. Stars are Amazon scores, not a lab test.
The Bosch PRO MultiMat disc, part 2608615065, is £25.40 for large grinders, with a 22.23 mm bore and a listing weight of 580 g. The highlight names concrete and reinforced concrete at 230 mm, while the materials field says metal, which you should not resolve by cutting steel. The item-thickness field reads 23 mm, the same order of size as the diameter, so it is not a kerf. The star line is 4.7 from 5,073 reviews, with 50 in the file. Those reviews describe concrete posts, reinforced gravel boards, block paviors and slabs, and one buyer notes that the teeth look as if they face the wrong way and then says they do not. Another review says the part number is not a Bosch Pro and calls the image misleading. One review describes several days on a small angle grinder, which is the wrong machine for a 230 mm disc. Rim type, EN 13236 and a listed maximum speed are not stated.
Pros
Cons
Best for: Block paviors, slabs and gravel boards on a 230 mm grinder, with the arrow checked before the nut goes on.
Less suitable: A small grinder, or a steel cut based on the materials field saying metal.
Specifications
Common questions
Will this Bosch disc fit a 230 mm angle grinder?
The listing targets 230 mm tools with bore 22.23 mm (also 22.2 mm in some lines). Check the arrow direction and the guard before the first cut. A small grinder is the wrong machine.
What materials does the listing name?
The materials field says metal. The highlight says concrete and reinforced concrete. Do not cut steel to settle that clash.
How is it rated on amazon.co.uk?
The raw listing shows 4.7 out of 5 from 5,073 reviews at £25.40. Stars are Amazon scores, not a lab test.
The DeWalt DT40260-QZ is £45.89, segmented, with a 22.23 mm bore and a listing weight of 272 g. The bullets say three 12 mm diamond segments, an aggressive pattern, and wet or dry cutting of concrete and masonry. The materials field says ceramic and marble, which does not match those bullets, and the item-thickness field reads 22.23 mm, which is the bore. The star line is 4.7 from 152 reviews, with 10 in the file and no criticism heading filled. Those ten mention tiles, brickwork, concrete tiles, and a disc left on the machine for regular use. Porcelain is not what the bullets describe, even where ceramic appears in the materials field. An EN 13236 mark and a listed maximum speed are not stated. Ten reviews are a thin sample beside 152 stars.
Pros
Cons
Best for: Brickwork and concrete tiles on a 230 mm grinder, if you ignore the ceramic materials field.
Less suitable: Porcelain, or a buyer who needs a stated speed and an EN 13236 mark.
Specifications
Common questions
Will this DeWalt disc fit a 230 mm angle grinder?
The listing targets 230 mm tools with bore 22.23 mm (also 22.2 mm in some lines). Check the arrow direction and the guard before the first cut.
What materials does the listing name?
The materials field says ceramic and marble. The bullets say concrete and masonry. Porcelain is not what the bullets describe.
How is it rated on amazon.co.uk?
The raw listing shows 4.7 out of 5 from 152 reviews at £45.89. Stars are Amazon scores, not a lab test.
The S&R 252.471.230 is a segmented 230 mm disc at £15.49, with a 22.2 mm bore and a listing weight of 660 g. The bullets say a 10 mm diamond height and a 2.6 mm thickness, while the item-thickness field reads 2.2 mm, so those figures do not agree. Materials named are brick, concrete, masonry and stone. The star line is 4.6 from 6,401 reviews, with 30 in the file. Those reviews include pebble concrete and 60 mm block paving on a drive, after the buyer had been using carbide discs. One review says the edge was gone within four days of work the buyer did not call heavy. An EN 13236 mark and a listed maximum speed are not on the row. The bore line says 22.2 mm, so check the fit on the spindle before you start.
Pros
Cons
Best for: Steady brick and 60 mm block on a 9 inch grinder, if the disc sits tight on the spindle.
Less suitable: A job that needs a stated speed mark or an EN 13236 line on the listing.
Specifications
Common questions
Will this S&R disc fit a 230 mm angle grinder?
The listing targets 230 mm tools with bore 22.2 mm. Check the arrow direction and the guard before the first cut. A loose fit is a reason to stop.
What materials does the listing name?
Compatible materials in the raw listing include brick, concrete, masonry and stone.
How is it rated on amazon.co.uk?
The raw listing shows 4.6 out of 5 from 6,401 reviews at £15.49. Stars are Amazon scores, not a lab test.
The Bosch turbo disc, part 2608602397, is £26.99. The amazon.co.uk title says small grinders, the highlight says Ø 230 mm for concrete and brick, and Bosch Professional UK lists the same part as 230 mm with a 22.23 mm bore, a 2.5 mm width and a 10 mm segment. The listing weight is 110 g, which is the figure Amazon shows, and this page does not correct it. The materials field says hard materials. The star line is 4.6 from 715 reviews, but only two reviews were in the file: one general praise line and one for a Stihl battery disc cutter. There is no criticism heading in that sample. An EN 13236 mark and a listed maximum speed are not stated on the Amazon row. Two reviews are not a UK verdict on chipping or life. Bosch’s UK page showed £38.70 for this part. The price used here is the amazon.co.uk shelf price.
Pros
Cons
Best for: A 230 mm grinder or disc cutter where you want a turbo rim and you have checked the Bosch UK size line.
Less suitable: A small grinder, or a choice that depends on UK complaints, because the file barely has UK comment.
Specifications
Common questions
Will this Bosch disc fit a 230 mm angle grinder?
Bosch Professional UK lists part 2608602397 as 230 mm with a 22.23 mm bore. The Amazon title says small grinders. Use the 230 mm line, and keep the guard on.
What materials does the listing name?
The materials field says hard materials. The highlight names concrete and brick.
How is it rated on amazon.co.uk?
The raw listing shows 4.6 out of 5 from 715 reviews at £26.99. Only two review texts were in the file. Stars are Amazon scores, not a lab test.
The OX X2-XL10-230 twin pack is £29.95 for two segmented discs, about £14.98 each, with a 22.23 mm bore and a listing weight of 1.2 kg for the pair. The bullets state a 10 mm segmented rim for concrete, brick, kerbs and paving, and they say the discs are for wet or dry cutting. The comparison cell for segment height reads 230 mm, which is the diameter, so use the 10 mm bullet and ignore that cell. The star line is 4.6 from 430 reviews, with 50 in the file. Those reviews include slabs, about 34 sandstone slabs in one account, roof slates and pavers. Criticism in the same file says the discs do not last, including one that liked the diamond thickness and still called the life short. An EN 13236 mark is not stated. A reviewer memory of a lower pair price is not the £29.95 shelf price.
Pros
Cons
Best for: A longer paving run where a second 10 mm segmented disc in the box is the point of the pack.
Less suitable: Anyone who will treat the 230 mm segment cell as diamond depth.
Specifications
Common questions
Will this OX disc fit a 230 mm angle grinder?
The listing targets 230 mm tools with bore 22.23 mm (also 22.2 mm in some lines). Check the arrow direction and the guard before the first cut.
What materials does the listing name?
Compatible materials in the raw listing include concrete, brick and stone. The bullets also name kerbs and paving, wet or dry.
How is it rated on amazon.co.uk?
The raw listing shows 4.6 out of 5 from 430 reviews at £29.95. Stars are Amazon scores, not a lab test.
The Tech Traders DISK-230mm is £9.99, with a 22.2 mm bore. The bullets state a maximum of 6,650 rpm, a 2.2 mm cutting width, and manufacture in accordance with EN 13236. The star line is 4.6 from 416 reviews, and 47 of those were in the file. Praise there includes Indian sandstone and an 11 m cut in a concrete slab that had been down for over 30 years. The same sample includes a disc that started to blunt after five cuts, and a review that says the teeth started flying off within five seconds on a concrete block-paving block. Another reviewer found the markings on the wrong side and said that was not a real problem in use. The materials field names stone, and the rim type is blank on the comparison row. A stated standard is not a record of how this disc behaved on that paving block.
Pros
Cons
Best for: A single garden channel in stone or old concrete, if you inspect the rim before the first touch.
Less suitable: Block paving as the first cut, after the review of teeth leaving the rim.
Specifications
Common questions
Will this Tech Traders disc fit a 230 mm angle grinder?
The listing targets 230 mm tools with bore 22.2 mm. Check the arrow direction and the guard before the first cut.
What materials does the listing name?
The materials field names stone. Sampled praise includes Indian sandstone and an old concrete slab.
How is it rated on amazon.co.uk?
The raw listing shows 4.6 out of 5 from 416 reviews at £9.99. Stars are Amazon scores, not a lab test.
The TopsTools TTDS230 is a segmented 230 mm disc at £8.99, with a 22.23 mm bore and a listing weight of 570 g. Across 263 amazon.co.uk reviews it sits at 4.6, and 33 of those were in the file we read. Several describe patio slabs and a short run of brickwork, including one that cut about thirty 4 inch blocks before the disc heated and flexed. The same file includes a review that went blunt after about 30 seconds, and another that lost a chunk of rim after three 15 mm tile pavers. The materials line names marble and stone, and one reviewer used the disc on metal, which this listing does not specify. The item-thickness field reads 2.8 mm, so treat that as a listing field rather than a measured kerf. Segment height and an EN 13236 mark are not stated.
Pros
Cons
Best for: A short patio or brick opening, if you stop the moment the rim chips or the disc flexes.
Less suitable: Tile pavers, metal, or any cut where a piece leaving the rim is unacceptable.
Specifications
Common questions
Will this TopsTools disc fit a 230 mm angle grinder?
The listing targets 230 mm tools with bore 22.23 mm (also 22.2 mm in some lines). Check the arrow direction and the guard before the first cut.
What materials does the listing name?
Compatible materials in the raw listing include marble and stone. One reviewer used the disc on metal, which this listing does not specify.
How is it rated on amazon.co.uk?
The raw listing shows 4.6 out of 5 from 263 reviews at £8.99. Stars are Amazon scores, not a lab test.
The PRODIAMANT procut-230 is £16.70, segmented, with a 22.23 mm bore, a 7 mm segment height on the comparison row and a listing weight of 620 g. The bullets name concrete, reinforced concrete, stone, brick, masonry, granite and paving stones, and they say the disc is tested to EN 13236. One bullet pairs the 22.23 mm bore with “M14”, which mixes the hole with the usual spindle thread. The item-thickness field reads 2.4 mm. The star line is 4.5 from 7,076 reviews, the largest count in this set, with 50 in the file. Those reviews include house brick, a garden wall, paving slabs, and a 50 square metre patio with concrete posts and gravel boards that one buyer said was still cutting. The criticism lines are mostly about ordinary wear rather than a rim breaking up. A 7 mm segment is shorter than the 10 mm and 15 mm claims elsewhere, so expect less diamond depth rather than a measured life.
Pros
Cons
Best for: Mixed brick, slab and paving-stone work where review volume matters more than a tall segment.
Less suitable: Hard Yorkstone all day, or anyone reading M14 as the hole size.
Specifications
Common questions
Will this PRODIAMANT disc fit a 230 mm angle grinder?
The listing targets 230 mm tools with bore 22.23 mm. M14 in a bullet is the usual spindle thread, not the hole. Check the arrow and the guard before the first cut.
What materials does the listing name?
The comparison materials include concrete, concrete products, stone, brick and masonry. The bullets also name granite and paving stones.
How is it rated on amazon.co.uk?
The raw listing shows 4.5 out of 5 from 7,076 reviews at £16.70. Stars are Amazon scores, not a lab test.
The Blue Spot 19549 twin pack is £15.10 for two 230 mm discs, about £7.55 each at that shelf price, with a stated maximum of 6,600 rpm and an EN 13236 mention in the raw listing. The materials line names roof tiles, concrete, kerb stones, slabs, pipes and bricks, and the listing weight is 1.18 kg for the pair. The star line is 4.5 from 877 reviews, with 50 in the file. Several of those describe paving slabs and block paving, including a curved pond-to-patio job. One review says the discs started buckling after two cuts in lightweight concrete blocks, and a short line still says they do not last long. Rim type and segment height are blank on the row, though the variant line says segmented. A reinforced-concrete flag on the listing is not permission to cut steel.
Pros
Cons
Best for: A patio of slabs and block where a second disc in the box matters more than a tall segment.
Less suitable: Lightweight block as the main job, after the buckling review.
Specifications
Common questions
Will this Blue Spot disc fit a 230 mm angle grinder?
The listing targets 230 mm tools with bore 22.23 mm (also 22.2 mm in some lines). Check the arrow direction and the guard before the first cut.
What materials does the listing name?
The materials line names roof tiles, concrete, kerb stones, slabs, pipes and bricks.
How is it rated on amazon.co.uk?
The raw listing shows 4.5 out of 5 from 877 reviews at £15.10. Stars are Amazon scores, not a lab test.
The Bosch Professional universal disc, part 2608615031, is £11.99 with a 22.23 mm bore and a listing weight of 509 g. The scope line reads 230 x 22.23 x 7 mm, and the highlight names concrete and brick on a large angle grinder, while the materials field names marble and stone. The star line is 4.4 from 74 reviews, the smallest count among the Bosch discs here, and only five reviews were in the file. Those five include slag-reduction blocks and Indian stone patio slabs with a cut the reviewer called free of chipping. No criticism heading was filled in that sample. This is also the disc Bosch names in the EXPERT “up to 4x” comparison, which is the maker’s line rather than a life we measured. Rim type, a listed maximum speed and an EN 13236 mark are not on this row.
Pros
Cons
Best for: A short stone or brick job where you want a named Bosch part without the EXPERT price.
Less suitable: A week of kerbs, or anyone treating the 7 mm scope figure as a measured kerf.
Specifications
Common questions
Will this Bosch disc fit a 230 mm angle grinder?
The listing targets 230 mm tools with bore 22.23 mm (also 22.2 mm in some lines). Check the arrow direction and the guard before the first cut.
What materials does the listing name?
The materials field names marble and stone. The highlight names concrete and brick.
How is it rated on amazon.co.uk?
The raw listing shows 4.4 out of 5 from 74 reviews at £11.99. Stars are Amazon scores, not a lab test.
The OX XLC15-230/22 is a turbo-segmented 230 mm disc at £15.24, with a 22.23 mm bore and a 15 mm segment height in the model line and the bullets. The highlight names granite, reinforced concrete or slab, plus wide gullets and holes for cooling and debris. The comparison materials field names concrete, and the listing weight is 530 g. The item-thickness field also reads 15 mm, which matches the stated segment height, so do not read it as the kerf. The amazon.co.uk file has no customer-review line and no sampled reviews, which is why the score sits at 0. An EN 13236 mark and a listed maximum speed are not stated. A 15 mm turbo rim is a specification claim until a buyer reports a cut.
Pros
Cons
Best for: You want the tallest stated segment in this set and you will judge the disc yourself on the first slab.
Less suitable: Anyone who buys from review volume, because this listing has none in the file.
Specifications
Common questions
Will this OX disc fit a 230 mm angle grinder?
The listing targets 230 mm tools with bore 22.23 mm (also 22.2 mm in some lines). Check the arrow direction and the guard before the first cut.
What materials does the listing name?
The comparison materials field names concrete. The highlight also names granite and slab. Reinforced concrete in a bullet is not a steel specification.
Is there a UK star rating?
The amazon.co.uk file has no customer-review line and no sampled reviews. Star rating and review count are not available from this scrape.
Twelve amazon.co.uk listings were scored on 19 October 2026. Weights sum to 100. There was no lab cut. Prices are the saved shelf prices in GBP. A materials field that clashes with the bullets, an item thickness that repeats the diameter or the bore, and a review that describes pieces leaving the rim all deduct. A very small sample is not a clean record. Neither badge means safest.
Amazon evidence
40%Star line and review count on amazon.co.uk. No review line scores as no evidence. A very small written sample does not count as a clean record.
Stated fit
25%230 mm, a bore of 22.23 mm or 22.2 mm, the rim, and a segment height taken from the bullets. A materials field that clashes with the bullets, or an item thickness that repeats the diameter or the bore, loses points.
Price
20%Shelf price in GBP against that stated fit. The lowest price inside the joint top score band is the best-value badge. A low price does not erase a review of rim damage.
Review outcome
15%What the stored UK review notes say about the cut, including rim damage, early blunting, and a disc that buckled. Pieces leaving the rim come off this block.
The checks run in this order: diameter and the guard, bore, rim and material, segment height from the bullets, speed, then the standard and the dust. The table is the twelve listings. There was no lab cut. A star row is amazon.co.uk’s figure.
A 230 mm diamond cutting disc is a steel wheel with a diamond rim for a large angle grinder or a compatible cut-off saw, sold in the UK as a 9 inch diamond blade. People buy one to cut concrete, brick, block paving, kerbs and patio slabs. The disc belongs on a machine rated for that size, with the guard on. Do not move the guard to fit it to a smaller machine. The bore is 22.23 mm. Some listings say 22.2 mm. M14 is the usual spindle thread, not the hole.
Amazon’s thickness field sometimes repeats the diameter or the bore. Segment height comes from the bullets: 7 mm, 10 mm, 12 mm or 15 mm where those figures are actually written.
Check the arrow before the nut goes on. If a segment cracks or the disc wobbles, stop. Do not keep cutting to finish a slab.
A continuous rim is the tile edge, and this set mostly does not sell one. A materials field that says metal is not a steel specification when the highlight says concrete.
Use a 230 mm disc on a 230 mm machine and leave the guard on. The hole is 22.23 mm, sometimes written 22.2 mm. M14 is the spindle thread. A segmented rim is the general choice for concrete, brick and slabs. A turbo rim is the more aggressive edge. A continuous rim is for tile, and porcelain wants a different blade. The materials field and the bullets do not always agree. Bosch EXPERT and Bosch PRO MultiMat say metal in the field and concrete in the highlight.
Do not exceed the lower of the disc mark and the spindle mark. Blue Spot states 6,600 rpm. Tech Traders states 6,650 rpm. FEPA’s 80 m/s figure is about 6,650 rpm on 230 mm by arithmetic, and it is not a mark printed on every disc here. EN 13236 is stated on PRODIAMANT, Blue Spot and Tech Traders only. Silica dust from concrete, brick, mortar and stone has an HSE workplace exposure limit of 0.1 mg/m³ over 8 hours.
Three typical situations, each with a recommendation from this comparison.
You cut masonry often enough that a stated 15 mm edge and the highest star line matter more than the shelf price. The Bosch EXPERT is £84.43, with 4.8 from 486 reviews. The “up to 4x” line is Bosch’s comparison with part 2608615031, not a test we ran.
You want the lowest price in the joint top score band and you will stop if the rim chips. The TopsTools TTDS230 is £8.99, with 4.6 from 263 reviews. One review lost a chunk of rim after three 15 mm tile pavers.
You want two discs in the box for slabs and block, at £15.10. The Blue Spot twin states 6,600 rpm and mentions EN 13236. One review says the discs buckled after two cuts in lightweight blocks.
The top pick is the Bosch EXPERT at £84.43, with 4.8 from 486 reviews and a stated 15 mm segment on a 230 mm disc. The “up to 4x” line is Bosch’s comparison with part 2608615031, not a life we measured, and the materials field says metal while the highlight says concrete. The best value is the TopsTools TTDS230 at £8.99, the lowest shelf price in the joint top score band, with 4.6 from 263 reviews and a review that lost a chunk of rim. Neither badge means safest. A masonry disc in this table is not a steel cutter.
Bosch EXPERT diamond cutting disc
Highest score, on stars and a stated 15 mm edge: 4.8 from 486 reviews at £84.43. The life claim is Bosch’s comparison, and the materials field says metal.
TopsTools TTDS230
Lowest shelf price in the joint top score band, at £8.99, with 4.6 from 263 reviews. One review lost a chunk of rim after three tile pavers.
Editorial
Peter F. is the editor for DIY & tools at productscompared.co.uk. Comparisons in this category are checked against amazon.co.uk listings, review evidence and public UK sources.
Guides on what to look for, how to use a product, and common mistakes.
Sources taken from the research digest. Listings were checked on 19.10.2026.
This article contains affiliate links. If you buy through these links we may earn a small commission, at no extra cost to you. Prices, stars and review counts come from stored amazon.co.uk listings. We did not run a lab test.
