EN 13236 diamond blade: what the safety mark means

The blade in the box is 350 mm, the listing mentions EN 13236, and it is tempting to treat that line as a quality grade. An EN 13236 diamond blade is a diamond cutting product whose maker claims it meets a European safety standard for that class of product. It is not a score for how many kerbs the rim will finish, and it is not the same claim as a mark on the saw.

This page uses the FEPA leaflet for diamond blades on petrol cut-off saws, the OSA marking note, OX Tools' definition, and the amazon.co.uk text captured for five 350 mm blades in our 350 mm diamond blade comparison. We did not run a lab test and did not measure cutting life. A qualifying purchase through our amazon.co.uk links can earn a commission at no extra cost to you.

In short

EN 13236 is a safety standard for diamond cutting products, not a diamond grade or a life test. Both PRODIAMANT bores and the OX Contractor state the mark in the listing. The OX Pro V10 and GVHAKG bullets do not, which is a gap in the text, not proof the steel is blank.

What the mark is

OX Tools describes EN 13236 as the European standard for the safety requirements of diamond cutting products. The comparison uses the 2019 edition. On a UK listing you will also see BS EN 13236, the same number in its British form. The claim belongs to the blade. It does not transfer to the saw, the guard, or the person on the handles.

FEPA's leaflet for diamond blades on petrol cut-off machines says not to use a blade that lacks the mark. It covers hand-held saws in the 300–420 mm class, so a 350 mm disc cutter sits in that scope, and it treats wet cutting as the petrol-saw default. It is not written for an angle grinder. The buying guide puts diameter first for that reason.

The OSA marking note lists direction of rotation, the EN 13236 reference, dimensions, speed, restrictions, and a traceability code. FEPA treats those markings as mandatory once a product claims the standard. Abrasives Safety says a product without the mark may not meet the standard. These sources do not state a UK criminal offence for selling an unmarked blade. Do not fit a blade that lacks the mark. An oSa logo, when printed, is the Organisation for the Safety of Abrasives. It is a prompt to find the number, the speed, and the size, not a life grade or a stand-in for a missing maximum speed.

What you should read on the blade

Read the steel before the stars. You want a rotation arrow that agrees with the saw, the size (350 mm here, with a 20 mm or a 25.4 mm bore), a maximum speed, the maker, a traceability code, and any wet or dry limit. The saw-fit guide separates those bores. The 25.4 mm PRODIAMANT does not list a reduction ring, so the right standard on the wrong bore still will not run true.

None of the five kept amazon.co.uk listings states an rpm. The standard requires the marking. It does not give one speed to memorise, and a speed copied from a different disc does not belong on these blades. If the steel has no speed or no arrow, a bullet that mentions EN 13236 does not fill the gap. The blade's maximum has to be at least the saw's spindle speed, and you can check that only when both numbers are printed. PRODIAMANT states wet or dry. The OX Contractor listing does not. If the print is ground off, painted over, or only on a sticker, leave the blade off the saw.

What it does not prove

The usual misreading is life. Segment height is diamond left to wear, not a certificate of metres. Both PRODIAMANT bores, the OX Contractor, and the GVHAKG blade state 15 mm. The OX Pro V10 states 10 mm. No kept listing publishes a life in metres. One UK complaint on the shared PRODIAMANT reviews mentions about 7 m of 5 inch concrete. That is one job, not an average, and the mark does not turn it into a test result.

The mark does not match the bond to the ground. PRODIAMANT names concrete, reinforced concrete, granite, kerbs, brick, and masonry. The OX Contractor names bricks, slabs, roof tiles, and concrete paviours. GVHAKG names asphalt as well as concrete. EN 13236 does not add asphalt to a blade that never states it. Asphalt can undercut a hard concrete bond, which is why the concrete and asphalt page treats them as different products at the same diameter.

It does not replace the guard, the water, or a straight cut. A marked blade still makes silica in concrete, and this page did not measure that exposure.

Which listings state it

Prices below are the captured amazon.co.uk figures from October 2026, in pounds, as Amazon showed them. They are a snapshot, not today's shelf.

Both PRODIAMANT listings state EN 13236. The 20 mm blade, B0171VPD7A, model 833800-350-20, was £54.78: a 350 mm turbo, 15 mm segment, 3.5 mm thick, wet or dry. The 25.4 mm blade, B0171VPDSO, was £51.83, with no reduction ring listed, so it is the wrong box for a 20 mm arbor. The 4.3 from 1,078 ratings is shared across both bores. Asphalt is not named. One complaint said a Stihl saw needed a washer that was not supplied. The mark does not fix that flange.

The OX Contractor CG15-350/20, B0D8BQZKZQ, was £30.92 and also states the mark. It is a 20 mm, 15 mm turbo for bricks, slabs, roof tiles, and concrete paviours. OX calls the line entry-level general purpose. There is no review line, wet or dry is not stated, and the thickness field repeats the 15 mm segment, so kerf is unknown. It is the lowest captured price that names the standard, and a poor fit if you need asphalt or a stated kerf. Who should skip each row is on the best 350 mm blades page.

The OX Pro V10, B0H4ZJ3T28, model V10-350/20, was £72.70. The captured bullets do not state EN 13236 or wet or dry. The title says 350 mm, while the included-components line says 300/20, and most of the 28 ratings describe smaller discs. It is the row that names metal, with a 10 mm segment. A missing bullet is not proof the steel is blank.

The GVHAKG blade, B0FHQF6ZJJ, was £50.82. It names concrete and asphalt, a 20 mm bore, 24 segments, a 15 mm height, and 3.2 mm thickness, and it states wet or dry. EN 13236 is not in the captured fields, and many of the 46 ratings describe smaller discs. If asphalt is the job, this is the row that says so. A silent bullet is neither a fail nor a pass.

If the blade has no mark

Leave the blade in the box if the core has no EN 13236 line, no arrow, or no maximum speed. You need that print and the saw's speed plate before the first cut.

Match the bore in the same check. A 25.4 mm PRODIAMANT on a 20 mm arbor, or a 20 mm blade packed with a washer the box did not include, is outside the fit these listings describe. The standard number does not license a homemade spacer.

Stop if the blade wobbles, if you grind sideways, or if the off-cut pinches the rim. A crack, a missing segment, or a glazed rim means the blade is finished. Water on a petrol saw is the leaflet's default, and it does not cancel a missing speed. Prefer a listing that states EN 13236 once the bore and the material already match. That is why the 20 mm PRODIAMANT is the top pick for concrete and masonry on a 20 mm saw. Skip it if you need asphalt named, or if the arbor is 25.4 mm, and still read the core.