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Reciprocating saw blade for aerated concrete

Updated: 22 October 2026

You have a Thermalite or aircrete block in the opening and a short brick blade in the saw. It will not reach the far face once the shank stays on your side of the cut. A reciprocating saw blade for aerated concrete has to be a carbide tooth whose stated cut or working length clears the thickness you measure. Cement block, stone and hard clay are different materials. This page is length against block thickness. The nine-blade grid is the [reciprocating saw blade masonry comparison](/hub/saw-accessories/reciprocating-saw-blade-masonry). Peter F. checked these lengths on 20 October 2026. We did not saw a block in a lab.

You have a Thermalite or aircrete block in the opening and a short brick blade in the saw. It will not reach the far face once the shank stays on your side of the cut.

Our top picks

EZARC EZARC 450 mm aerated-concrete blade

Best overall

EZARC EZARC 450 mm aerated-concrete blade
8.4/10about £23.37
View offer
TOLESA TOLESA 300 mm 2 TPI masonry blade

Alternative

TOLESA TOLESA 300 mm 2 TPI masonry blade
8.0/10about £17.99
View offer
EXFEIN EXFEIN 305 mm masonry blades, 2-pack

Alternative

EXFEIN EXFEIN 305 mm masonry blades, 2-pack
7.8/10about £23.99
View offer
On this page
  1. 1.Aircrete is not cement block
  2. 2.Measure the block, then the working length
  3. 3.When the block needs 380 mm to 450 mm
  4. 4.3 TPI on trade blades, 2 TPI on these listings

Aircrete is not cement block

Porous aerated concrete and hollow brick are what a coarse carbide tooth is sold for. TOLESA, EXFEIN and EZARC all print the same exclusion: not stones, hard rocks, cement blocks or fine branches. MUOZLOP says it cannot cut concrete that contains stones. A garage wall of dense block is not a sort of aircrete. Thermalite, Celcon and Toplite are brand names renovators use for aircrete. Bosch’s and Hilti’s aerated pages do not name Thermalite, and no source here is a Thermalite manual telling you to use a reciprocating saw. Measure the piece. Hilti’s UK aerated blades are 3 TPI, stated for AAC, ALC and Ytong, up to 215 mm thick. That 215 mm is a Hilti limit, not a figure you can paste onto an amazon.co.uk ASIN.

Measure the block, then the working length

The shank does not enter the cut, so overall length is not the depth. Bosch’s S 1141 HM is 225 mm overall, 3 TPI, with a maximum cut of 175 mm, at £30.23 including VAT. S 1241 HM is listed for a cut under 250 mm, and S 2041 HM for a cut under 350 mm. Rawlplug’s 305 mm aerated blade prints a 255 mm working length and a cutting figure of 250 mm. In this set, EXFEIN states 305 mm total and 253 mm working, at 2 TPI, two blades at £23.99. That stated working length is the useful amazon.co.uk figure when your measured cut is around 250 mm. TOLESA is 300 mm and 2 TPI at £17.99, without a separate working-length line, so you still leave room for the shank. A Saxton of about 228 mm, or a Fyeme at 254 mm, will not cross a thick cavity wall.
EZARC EZARC 450 mm aerated-concrete blade

Testsieger

EZARC EZARC 450 mm aerated-concrete blade
8.4/10about £23.37
View offer

When the block needs 380 mm to 450 mm

The EZARC in this set is ASIN B0D7VTQXJ6, 450 mm, £23.37, 4.2 out of 5 from 402 ratings. Teeth per inch is not stated. The listing says that length can cut an entire block in one stroke. Treat that as a listing claim, not a measured depth, and do not copy 2 TPI or £19.97 from a different EZARC page. Cement blocks and stone stay excluded. Only six UK review texts are stored. MUOZLOP is three 380 mm blades at 2 TPI and £35.14. It cannot cut concrete that contains stones. A UK review on a DeWalt 18 V saw reported heavy vibration in mortar and a user who stopped. A 380 to 450 mm blade needs a saw that can hold a straight stroke. Diamond Direct states 3.6 N/mm² and 190 mm. Eclipse states bricks under 150 mm. Do not merge those two figures.

3 TPI on trade blades, 2 TPI on these listings

Bosch and Hilti publish 3 TPI for aerated concrete. TOLESA, EXFEIN and MUOZLOP print 2 TPI and still name aerated or porous concrete. That is a coarse brick pitch, not a lab result at 3 TPI. EZARC’s 450 mm pitch is not stated. Within about 175 mm of cut, a 228 to 254 mm blade belongs only with the shank allowed for. Near 250 mm, use a stated working length such as EXFEIN’s 253 mm. A full-block stroke is the 450 mm EZARC claim, with the exclusion still in force. Edge and pack count sit on the buying guide. The short-brick top pick is on the best blade page.

Common questions

Will a brick reciprocating blade cut aircrete or Thermalite?
A coarse carbide-tooth blade can, if the listing names porous aerated concrete or hollow brick and the working length clears the block you measured. A short 2 TPI brick blade does not become a Thermalite blade just because both are masonry. Cement block is excluded on TOLESA, EXFEIN and EZARC. There is no Thermalite manual in these sources telling you to use a sabre saw.
How long a blade do you need once the shank stays outside the block?
You need a stated cut or working length at least as deep as the piece. Bosch’s 225 mm aerated blade is for 175 mm. Rawlplug prints 255 mm working and a 250 mm cutting figure on a 305 mm blade. EXFEIN states 253 mm working on a 305 mm blade. Overall length alone overstates the cut by the holder.
Is 3 TPI better than 2 TPI for aerated concrete?
Bosch and Hilti publish 3 TPI for aerated concrete. TOLESA, EXFEIN and MUOZLOP print 2 TPI and still name aerated or porous concrete. 2 TPI is a coarse brick pitch, not a metal blade, and it is not a lab result at 3 TPI. Anything much finer is the wrong category. EZARC’s 450 mm pitch is not stated.
What does EZARC’s “entire block in one stroke” specify?
On ASIN B0D7VTQXJ6 it specifies a 450 mm listing claim at £23.37, 4.2 from 402 ratings, with teeth per inch not stated. It is not a measured depth. A different EZARC page at 300 mm and £19.97 is not this blade. Do not copy 2 TPI from that other listing. Cement blocks and stone remain excluded.
Does a 450 mm blade need a different saw?
It needs a saw that can hold a straight stroke. A small cordless saw often cannot. A UK review of a 380 mm blade on a DeWalt 18 V saw described heavy vibration in mortar and a stopped cut. If the shoe cannot control the length, buy a shorter blade that still clears the measured thickness, or stop.

Related pages

How to cut brick with a reciprocating saw

Reciprocating saw blade masonry

Best reciprocating saw blade for brick: short cuts

Buying a masonry reciprocating saw blade: the order

Reciprocating saw vs angle grinder for brick walls

Sources

Public UK sources and the amazon.co.uk listings compared on this page. Prices and stars stored on 20 October 2026.

  1. Bosch Professional GB, S 1141 HM aerated-concrete blade (retrieved 20.10.2026)
  2. Hilti UK aerated-concrete saw blades (retrieved 20.10.2026)
  3. Hilti UK brick saw blades (retrieved 20.10.2026)
  4. Rawlplug RT-RSB-AB reciprocating saw blades for aerated concrete (retrieved 20.10.2026)
  5. Eclipse reciprocating blade for brick (retrieved 20.10.2026)
  6. HSE CIS36, construction dust (retrieved 20.10.2026)
  7. HSE, cutting paving blocks, kerbs and flags (retrieved 20.10.2026)
  8. HSE, hand-arm vibration initial values (retrieved 20.10.2026)