350mm diamond blade price: what you pay in the UK

A 350mm diamond blade price can look straightforward until you compare the bore, VAT and the material the blade is meant to cut. In our October 2026 UK snapshot, five 350 mm blades on amazon.co.uk ran from £30.92 to £72.70, while selected trade retailers advertised examples from £27.53 to £80.34 including VAT. The cheapest listing is not automatically the cheapest way to finish a job, and a £70 blade does not come with a guarantee of twice the cutting life.

Peter F. checked those five amazon.co.uk listings and selected public UK trade prices in October 2026, alongside the 350 mm diamond blade comparison. The top pick there is the PRODIAMANT 350 mm blade with a 20 mm bore, ASIN B0171VPD7A, at about £54.78. This article uses advertised prices and specifications, with no laboratory blade-life test. A qualifying purchase can earn a commission at no extra cost to you.

In short

Allow roughly £31 to £73 for the 350 mm blades in this amazon.co.uk comparison, then check the bore and the stated application before you compare price. The £30.92 OX Contractor CG15 was the best-value option in that set on the price you pay up front. Price alone cannot tell you how many metres a blade will cut in your concrete, kerb or paving.

The amazon.co.uk shelf in this comparison

The useful starting point is a dated shelf price, not an assumed national average. The five amazon.co.uk listings were £30.92 for the OX Contractor CG15 350 mm, £50.82 for a GVHAKG blade, £51.83 for a 25.4 mm-bore PRODIAMANT blade, £54.78 for the 20 mm-bore PRODIAMANT blade and £72.70 for an OX Pro V10. That is an observed range of £30.92 to £72.70 in October 2026.

Those figures are a snapshot of specific listings. Marketplace prices can change, stock can move between sellers, and delivery can alter the real cost. Two discs with the same 350 mm diameter may have different bores, segment designs and stated applications. A lower price is comparable only when the blade fits your saw and is intended for the material you cut.

Why two similar-looking PRODIAMANT blades cost differently

The two PRODIAMANT prices show why diameter is only the first filter. The 25.4 mm-bore version was listed at £51.83, while the 20 mm version, the top pick here, was £54.78. If your petrol cut-off saw takes a 20 mm bore, the slightly dearer direct-fit blade may be the simpler purchase. Its 4.3-star score comes from 1,078 amazon.co.uk ratings shared with the 25.4 mm variant, so it is not a clean measure of this bore alone.

A reducing ring may let a compatible 25.4 mm blade fit a 20 mm spindle. Check the saw manual, the blade marking, the maximum speed and the fitting instructions before you assume the combination is suitable. The small saving disappears if you buy a ring, receive the wrong part or lose time on the fit. The saw fit guide matches bore and guard before a lower price counts as a saving.

Trade-counter prices for the same diameter

Trade retailers widen the apparent range. Toolstore Direct listed the OX CG15-350/20 at £27.53 including VAT. Power Tools Direct showed a CorePlus 350 mm blade at a £42.06 special price and £50.47 including VAT. Watsons listed a Mexco GPX10 350 mm, 20 mm-bore blade at £40.96 excluding VAT and £49.15 including VAT. At the upper end of these examples, Howarth Timber listed a Spectrum 350/20 blade at £80.34 including VAT.

These are reference points across different ranges, sellers and offers. Carriage, account discounts and collection can change which deal is cheapest. A merchant five minutes from site may beat an online saving if an unsuitable blade stops the job for half a day.

VAT presentation is the easiest source of a false bargain. The £40.96 Watsons figure becomes £49.15 once VAT is included. Power Tools Direct likewise displayed £42.06 and £50.47, so the VAT-inclusive amount is the fair comparison with a consumer-facing Amazon price. If you are buying for yourself rather than reclaiming VAT through a VAT-registered business, compare the amount you actually pay, including delivery.

Why an OX blade may be cheaper at a trade retailer

A trade retailer may be clearing a line, running a promotion or pricing for collection. Amazon stock can come from another seller with different delivery costs. The same brand can mean different ranges, so compare the model reference, not only the logo and the diameter.

Toolstore Direct's £27.53 CG15-350/20 and the £30.92 OX Contractor on amazon.co.uk are close. Check the specification before you treat them as the same blade. The figure that matters is the delivered, VAT-inclusive cost of the correct model in stock.

What a higher price does and does not buy

A dearer blade may use a different diamond bond, segment geometry or manufacturing specification. It may also be positioned for a particular material or for more frequent use. Those differences can matter. The shelf price itself is not evidence of longer life. None of the prices above tells you how many metres the blade will cut in your saw, through your material, with your technique.

Blade life depends on abrasive content, aggregate hardness, reinforcement, depth, cooling and how you feed the saw. Forcing the blade, twisting it or overheating it can erase a premium. Segment height is a specification. It does not guarantee metres cut. EN 13236 on these listings is a safety mark. It does not count metres cut.

Cost per metre needs controlled results or your own job records. If one £70 blade finishes three equivalent jobs and a £31 blade finishes one, the premium could pay. If both finish the same patio with segment left, the cheaper correct-fit blade can be a rational buy. Stars can reflect delivery and different materials. They do not turn mixed jobs into a life test.

Set a realistic all-in budget

For a typical 20 mm-bore petrol saw, a sensible blade-only starting budget is about £35 to £60 based on the sourced prices, with room above that for a specialist or premium model. That planning range comes from this snapshot. The cheapest or dearest disc may still be the wrong match for your material.

Budget separately for a compatible reducing ring, water supply, fuel or power, and personal protective equipment. Cutting concrete, kerbs and paving can release respirable crystalline silica, so follow the saw instructions and the risk assessment. Silica dust when cutting kerbs sits beside the blade price.

Also price the interruption, not only the consumable. Ordering an unverified 25.4 mm blade for a 20 mm machine can cost more in delay than the few pounds saved. Before checkout, confirm each of these:

1. Confirm that the blade diameter is 350 mm and permitted by the saw and guard.
2. Match the bore to the spindle, or use only a reducing arrangement that the relevant instructions permit.
3. Check that the blade's maximum operating speed is suitable for the saw.
4. Choose a blade stated for the material and for wet or dry use as applicable.
5. Compare the delivered price including VAT, carriage and any required accessories.

A 115 mm angle-grinder disc is a poor benchmark for a 350 mm blade. Diameter, construction, machine power and cutting depth differ. A 300 mm saw is the nearer size question, and its blades and guards do not fit a 350 mm machine.

How to decide whether paying extra makes sense

Start with the job. For one defined domestic task, a lower-priced compatible general-purpose blade can be a sensible choice if its stated application matches the material. For repeated trade use, consistency, supplier support and your own cost-per-job records can justify paying more. Neither situation makes the most expensive listing the automatic winner.

If you cut regularly, record the model, price, material, approximate quantity and why you retired the blade. A blade used on abrasive blocks is not comparable with one used on a different aggregate under better cooling.

For an urgent job, local stock and an easy return can be worth several pounds. For planned work, compare the exact model on amazon.co.uk and at trade sellers, then recheck the basket. The October 2026 figures will age. Buy the lowest-priced blade that fits, suits the material and matches the work you expect. Pay more when a specification, your own records or dependable supply solves a real problem. The buying guide sets bore, material and segment beside the price.