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350mm diamond blade buying guide

Updated: October 2026

A 350 mm disc can look right in an online photograph and still be unusable when it arrives: the guard may only accept 300 mm, the bore may not match the shaft, or the bond may be wrong for the material. This 350mm diamond blade buying guide puts those checks in the order that prevents an expensive mistake. Start with the saw, then confirm the bore and material before comparing segment height or price. Our [350 mm diamond blade comparison](/hub/tool-accessories/350mm-diamond-blade) shows the captured amazon.co.uk prices and specifications for five listings, but the machine manual and blade markings remain the final authority. A qualifying purchase can earn a commission at no extra cost to you.

A 350 mm disc can look right in an online photograph and still be unusable when it arrives: the guard may only accept 300 mm, the bore may not match the shaft, or the bond may be wrong for the material.

Our top picks

PRODIAMANT PRODIAMANT 350 mm, 20 mm bore

Best overall

PRODIAMANT PRODIAMANT 350 mm, 20 mm bore
9.0/10about £54.78
View offer
PRODIAMANT PRODIAMANT 350 mm, 25.4 mm bore

Alternative

PRODIAMANT PRODIAMANT 350 mm, 25.4 mm bore
8.8/10about £51.83
View offer
OX OX Contractor CG15 350 mm

Best value

OX OX Contractor CG15 350 mm
7.4/10about £30.92
View offer
On this page
  1. 1.Check the saw before the basket
  2. 2.Match the bore, ring and flanges
  3. 3.Choose the material, segment and markings
  4. 4.What the five listings actually state

Check the saw before the basket

Diameter comes first because the guard and drive system are designed around a maximum wheel size. A 350 mm blade is not an upgrade for a saw labelled for 300 mm wheels. Stihl UK specifies 300 mm cutting wheels for the TS 410 and 350 mm wheels for the TS 420. A TS 410 owner should leave this category rather than assume that a larger guard or a deeper cut can be improvised. Read the data plate and manual for the exact machine, including any suffix in the model name. Confirm the maximum diameter, permissible blade type and maximum spindle speed. None of the five retained amazon.co.uk listings states a maximum rpm in the captured data. Draper publishes 4,350 rpm for its own 350 mm model 99786; that figure belongs to the Draper blade and must not be transferred to another disc. For the TS 410, TS 420 and Husqvarna distinctions, use the 350 mm blade bore and saw-fit guide.

Match the bore, ring and flanges

Four listings state or encode a 20 mm bore: the 20 mm PRODIAMANT, OX Contractor CG15-350/20, OX Pro V10-350/20 and GVHAKG. The other PRODIAMANT is a 25.4 mm version. Those numbers are not interchangeable, and neither should be confused with the 22.23 mm bore commonly seen on angle-grinder discs. The shaft, blade bore and approved flange arrangement need to match without play. A purpose-made reducing bush can adapt some 25.4 mm blades to a 20 mm shaft when the blade and machine manufacturers permit it. Mexco, for example, sells a 25.4-to-20 mm part. The 25.4 mm PRODIAMANT listing does not say that one is included. Do not enlarge a bore or make a washer from scrap. One UK complaint in the shared PRODIAMANT review material says a washer was needed for a Stihl saw but was not supplied. If the wheel rocks, binds or sits off-centre, stop and check the machine manual.
PRODIAMANT PRODIAMANT 350 mm, 20 mm bore

Testsieger

PRODIAMANT PRODIAMANT 350 mm, 20 mm bore
9.0/10about £54.78
View offer

Choose the material, segment and markings

Diamond-blade bonds are selected for the material, so general purpose is not a promise of equal life everywhere. Both PRODIAMANT variants name concrete, reinforced concrete and masonry. The OX Contractor names bricks, slabs, roof tiles and concrete paviours. GVHAKG is the only retained listing that explicitly names asphalt. The concrete or asphalt blade guide explains why that distinction matters. Segment height is specification data, not a service-life forecast. The PRODIAMANT variants, OX Contractor and GVHAKG state 15 mm segments; the OX Pro V10 states 10 mm. PRODIAMANT states a 3.5 mm kerf and GVHAKG 3.2 mm. The OX Contractor Amazon thickness field says 15 mm, matching its segment height, so the kerf is not established by that field. EN 13236 supports marking for superabrasive cutting-off wheels. It is not a comparative endurance test. PRODIAMANT and OX Contractor state it; the captured OX Pro and GVHAKG fields do not. Inspect the physical wheel for the direction arrow, maximum speed and application markings.

What the five listings actually state

The £54.78 PRODIAMANT 20 mm blade gives the clearest combination for a common 20 mm concrete saw: 350 mm, a 15 mm turbo segment, 3.5 mm thickness, wet or dry use and EN 13236 wording. The £51.83 25.4 mm version serves the same concrete and masonry role for a different arbor. Their 4.3 stars from 1,078 ratings are shared, so the count does not isolate either bore. At £30.92, the OX Contractor is the lowest captured price. It does not provide a review line, a reliable kerf, a wet-or-dry statement or an asphalt claim. The £72.70 OX Pro V10 names reinforced concrete and metal, but the included-components line says 300/20 mm. The £50.82 GVHAKG names concrete and asphalt. Once fit and application are settled, compare the conditional picks on the best 350 mm diamond blade page.

Common questions

What should I check first on a 350 mm diamond blade?
Check whether the exact saw model accepts a 350 mm wheel. Then confirm the bore, maximum permitted speed, blade type and material application against the manual and physical markings. Price and star ratings come later because neither can make an incompatible disc safe.
Is 20 mm or 25.4 mm the usual petrol-saw bore?
There is no safe universal answer. UK dealer specifications list the Stihl TS 420 at 20 mm, while Husqvarna's UK K 770 support data gives 25.4/20 mm. Read the specification for your exact saw rather than applying a general rule about petrol cutters.
Does a taller segment mean a longer life?
Not by itself. Segment height is only one input; bond hardness, diamond concentration, material abrasiveness, water, feed pressure and undercutting also affect wear. A 15 mm segment cannot be assumed to last 50 per cent longer than a 10 mm one.
What does EN 13236 promise?
EN 13236 is a safety standard for superabrasive products and supports consistent marking and safety requirements. It does not prove that one blade cuts faster or lasts longer than another. Check the wheel's speed, direction and application markings as well.
Can I trust a high Amazon rating on these listings?
Treat it as supporting evidence only when the reviews concern the exact size. The OX Pro and GVHAKG extracts contain many comments about smaller discs, while the two PRODIAMANT bores share one rating pool. Fit and stated application are stronger purchase filters here.
Is a reducing ring included with a 25.4 mm blade?
Only if the listing or packaging says so. The 25.4 mm PRODIAMANT page does not list a ring, and suitable bushes are also sold separately. Confirm manufacturer approval and the flange arrangement before using any reducer.

Related pages

How to use a 350 mm diamond blade

350 mm diamond blade

Best 350mm diamond blade for concrete on a 20 mm saw

Concrete or asphalt diamond blade for a 350 mm saw

350mm diamond blade bore size for TS 410 and TS 420

Sources

Public UK sources for silica, training, marking and saw size. amazon.co.uk listings for B0171VPD7A, B0171VPDSO, B0D8BQZKZQ, B0H4ZJ3T28 and B0FHQF6ZJJ were checked in October 2026. Prices move.

  1. HSE CIS54, dust from cutting and drilling (retrieved 17 October 2026)
  2. HSE INDG461, respirable crystalline silica (retrieved 17 October 2026)
  3. HSE, cutting paving blocks, kerbs and flags (retrieved 17 October 2026)
  4. HSE CN6, cutting paving and kerbs (retrieved 17 October 2026)
  5. PUWER 1998 regulation 9, training (retrieved 17 October 2026)
  6. FEPA safety leaflet, diamond saws on petrol cut-off machines (retrieved 17 October 2026)
  7. OSA, marking to EN 13236 (retrieved 17 October 2026)
  8. Stihl UK, TS 410 petrol cut-off machine (retrieved 17 October 2026)