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Circular saw depth of cut

Updated: 21 October 2026

You know how thick the piece is, and you need a cordless circular saw that can sever it in one pass, including when the shoe is tilted. The same blade clears less wood at 45° than at 90°, and several listings in this set quote neither number. UK pages disagree about what a CLS stud or a 4×2 actually measures, so the only thickness that counts is the one on your tape. The [cordless circular saw comparison](/hub/power-saws/cordless-circular-saw) is the nine-listing table. Which battery is in the price sits on the [buying guide](/hub/power-saws/cordless-circular-saw/sub/cordless-circular-saw-buying-guide). Peter F. compared the listings. There was no lab test. Every millimetre below is a listing bullet or a named UK source. A qualifying purchase can earn a commission at no extra cost to you.

You know how thick the piece is, and you need a cordless circular saw that can sever it in one pass, including when the shoe is tilted.

Our top picks

Bosch Professional Bosch Professional 06016A2101

Best overall

Bosch Professional Bosch Professional 06016A2101
8.8/10about £171
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Ryobi Ryobi R18CSP-0

Rank 2

Ryobi Ryobi R18CSP-0
8.6/10about £76.95
View offer
Dong Cheng Dong Cheng DCMY165S

Best value

Dong Cheng Dong Cheng DCMY165S
7.4/10about £82.99
View offer
On this page
  1. 1.Depth is an angle, not a single millimetre
  2. 2.What these listings actually state
  3. 3.Studs, CLS, and the contradiction
  4. 4.Spare under the board

Depth is an angle, not a single millimetre

At 90° the blade is square to the shoe, and the stated depth is the deepest straight cut the listing claims. Tilt the shoe to 45° and the vertical thickness you can sever drops. The Ryobi R18CSP-0 states both: 45 mm at 90° and 32 mm at 45° on a 150 mm blade. A board that just clears at 90° will not clear once you bevel it. Dong Cheng states 59 mm at 0°, 43 mm at 45° and 39 mm at 50°. Bosch's amazon.co.uk bullets say cuts up to 57 mm and do not give a 45° split. The bevel row states 90° only. Bosch's UK family sheet for the GKS 18V-57 G gives 57 mm and 42 mm. If you use 42 mm, say it came from that manufacturer sheet, not from the Amazon row. Do not cut a bevel on a saw whose angle row only says 90°.

What these listings actually state

These are the depths on the amazon.co.uk listings, and nothing has been filled in from a typical chart. Ryobi, 150 mm: 45 mm at 90°, 32 mm at 45°. Galax Pro, 115 mm: 42.8 mm at 90°, 28 mm at 45°. Keleef, 125 mm: the title says 50 mm at 90° and 40 mm at 45°, while the angle row says 40°. TEENO 165 mm: 54 mm at 90°, 38 mm at 45°. Dong Cheng: 59 mm at 0°, 43 mm at 45°, 39 mm at 50°. Bosch: up to 57 mm, with no 45° figure on the listing. Worx WX520 is 190 mm and states no depth. The TEENO mini is 76 mm and states no depth in millimetres. The Dremel station states neither a blade diameter nor a depth. BuildWiz's table, for other saws, puts about 66 mm on 190 mm. Copying that onto the Worx would invent a depth this listing does not give.
Bosch Professional Bosch Professional 06016A2101

Testsieger

Bosch Professional Bosch Professional 06016A2101
8.8/10about £171
View offer

Studs, CLS, and the contradiction

Public UK guides do not agree what the timber is called, so this page will not pick one national stud size. BuildWiz talks about 47 mm studs and says a 150 mm saw is tight for that face, which matches the Ryobi's stated 45 mm: 45 does not clear 47 in one pass. Green Gaffer's review of this exact Ryobi treats CLS 2×4 as 38 mm actual, and says dressed 44 mm timber will not clear in one pass. On that 38 mm reading, 45 mm has a little spare at 90° and the same saw states 32 mm at 45°. Nims Casa treats a 63 mm CLS face as too thick for a 165 mm saw in one pass. A 63 mm face is beyond every 90° figure this set states, including Dong Cheng's 59 mm. Measure, then match the angle you will cut. Who each saw is for is on the best cordless circular saw page.

Spare under the board

A saw that only just clears at 90° will not clear on a bevel, and it may not leave the 5–10 mm of tooth that SGS Engineering asks you to show below the wood. If your piece is 45 mm and the saw states 45 mm, you have a claimed match and no spare. Dong Cheng's 59 mm at 0° against a 47 mm face leaves more room than the Ryobi's 45 mm, and at 45° its stated 43 mm still does not clear that 47 mm face. Bosch's up to 57 mm is silent on the Amazon row once you tilt. The family sheet's 42 mm at 45° would not clear 47 mm either. Galax at 42.8 mm is a thin-sheet figure. A UK review describes about 2 feet of 6 mm MDF on a full 2.0 Ah pack, then a jam. The plunge saw comparison is the next page when the problem is a mid-panel cut rather than thickness.

Common questions

What is the difference between depth at 90° and at 45°?
At 90° the blade is square to the shoe and the listing's larger figure applies. At 45° the blade crosses the thickness on a slant, so you can sever less vertical depth. On the Ryobi that is 45 mm against 32 mm. On the Dong Cheng it is 59 mm at 0° against 43 mm at 45°. A board that matches the 90° figure will not match the bevel. Read the angle you will actually cut, not the biggest number in the title.
Will the Ryobi's 45 mm cut a 47 mm stud?
Not in one pass. The listing states 45 mm at 90°, which is less than 47 mm, so the fibres on the far side remain. Green Gaffer's review of this model treats a CLS face as 38 mm actual, and on that measurement 45 mm does clear at 90°. At 45° the same saw states 32 mm, which does not clear 38 mm. Measure your piece. Do not assume every 4×2 in a UK article is the same thickness.
Will a 165 mm saw cut a 63 mm face in one pass?
Not on the figures in this set. The deepest 90° claims here are Dong Cheng at 59 mm, Bosch at up to 57 mm, and TEENO at 54 mm. All three are under 63 mm. One UK guide uses 63 mm as the CLS face that needs a 184–190 mm class. Another guide talks about 47 mm. Neither number replaces your tape, and the Worx 190 mm listing states no depth you could use to bridge the gap.
Why do UK pages disagree on CLS?
Because CLS, 4×2 and stud are being used for more than one finished size. BuildWiz writes about 47 mm and says 150 mm saws struggle. A review of the Ryobi uses 38 mm for CLS 2×4 and 44 mm for dressed timber that will not clear. A third source uses a 63 mm face. Those can all be real pieces in different stacks. The disagreement is a reason to measure, not a reason to pick the number that suits the saw you hoped to buy.
Does a 190 mm blade guarantee a deeper cut if the listing omits depth?
No. The Worx WX520 is the 190 mm saw in this set, at £179.99, and the listing does not state a cutting depth. BuildWiz's about 66 mm is a class figure for other 190 mm saws, not a cell on this Amazon page. Using it would invent a specification. Until the depth is stated at 90° and at the bevel, the larger blade is not a plan you can hold against a measured face.
What thickness is comfortable for the 115 mm Galax?
Thin sheet, not studs. The listing states 42.8 mm at 90° and 28 mm at 45°, and UK reviews describe short runs: about 2 feet of 6 mm MDF on a 2.0 Ah pack before a jam, and cut-outs every few inches on 20 mm wood, laminate and chipboard. A thickness under 20 mm, with spare blade below the sheet, is the comfortable class. Anything near 42.8 mm is the claimed maximum, not a comfortable pass, and the HSS blade in that kit is the wrong blade for timber.

Related pages

How to use a cordless circular saw

Cordless circular saw

Best cordless circular saw: Ryobi, Dong Cheng or Bosch

Cordless circular saw buying guide: kit versus body

Cordless circular saw vs plunge saw on a guide rail

Sources

Public UK sources used for this comparison. Listing prices, stars and review counts are the amazon.co.uk figures captured on 19 October 2026. We did not run a lab test.

  1. HSE wood dust (retrieved 19 October 2026)
  2. Control of Noise at Work Regulations 2005 (retrieved 19 October 2026)
  3. HSE noise duties for employers (retrieved 19 October 2026)
  4. Supply of Machinery (Safety) Regulations 2008 (retrieved 19 October 2026)
  5. HSE circular saw bench (retrieved 19 October 2026)
  6. Bosch Professional GKS 18V-57 G (retrieved 19 October 2026)
  7. Bosch 18 V GKS guidance PDF (retrieved 19 October 2026)
  8. BuildWiz circular saw blade classes (retrieved 19 October 2026)