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315mm circular saw blade 30mm bore: checks to make

Updated: 22 October 2026

You have a site saw or a workshop bench, and the next tab is a pile of 315 mm titles. Some print a 30 mm bore, some a tooth count, and a few only say the disc fits many saws. A 315mm circular saw blade 30mm bore is the right class only when your saw manual asks for both numbers together. Diameter, bore, plate, kerf, teeth, hook, and marked speed are easy to mix. Shelf prices in the saved extracts run from £19.03 to £76.95. This is a checklist, not a cut test. A qualifying purchase can earn us a commission at no extra cost to you. Prices and scores stay on the [315mm x 30mm circular saw blade comparison](/hub/saw-accessories/315mm-x-30mm-circular-saw-blade).

You have a site saw or a workshop bench, and the next tab is a pile of 315 mm titles. Some print a 30 mm bore, some a tooth count, and a few only say the disc fits many saws.

Our top picks

Trend Trend CSB/31548 combination blade, 48 teeth

Best overall

Trend Trend CSB/31548 combination blade, 48 teeth
8.8/10about £37.00
View offer
Draper Draper 24969 wood blade, 48 teeth

Alternative

Draper Draper 24969 wood blade, 48 teeth
7.1/10about £27.07
View offer
BGS Do it yourself BGS 3957 carbide blade, 30 teeth

Best value

BGS Do it yourself BGS 3957 carbide blade, 30 teeth
8.2/10about £19.03
View offer
On this page
  1. 1.Diameter and bore come as a pair
  2. 2.Plate, kerf, and the riving knife
  3. 3.Teeth, hook, and the marked speed
  4. 4.What this set does not tell you

Diameter and bore come as a pair

Start with the two numbers the arbor needs. A 315 mm blade is the class for a Makita 2712 or a Metabo TKHS 315 when the manual says so. A 305 mm blade is a different disc, even when a seller calls both of them twelve-inch. The bore has to be 30 mm as well. A loose bush will not force a 25.4 mm bore onto a 30 mm arbor. HSE guidance allows a fixed reducing ring only, and only onto a smaller arbor. It does not open a bore, and it does not turn 305 mm into 315 mm. Every listing in this set states 315 mm and 30 mm. That still does not mean each one suits your knife. If the manual is missing, stop before you compare tooth counts.

Plate, kerf, and the riving knife

Plate thickness is the body. Kerf is the width the teeth cut. HSE wants the riving knife thicker than the plate and thinner than the kerf, and within 8 mm of the blade at table level. The three Trend titles state a 3.2 mm kerf, and the item-thickness field reads 2.2 mm. The BGS 3957 bullets state a 2.2 mm plate and a 3.0 mm cutting width. A knife set for 3.2 mm can be too thick for 3.0 mm. The Draper amazon rows do not print a kerf or a plate. Draper's page for 24969 states a 3.2 mm kerf that is not in the amazon raw. The Makita 2 mm body limit is a separate check, on the saw fit page.
Trend Trend CSB/31548 combination blade, 48 teeth

Testsieger

Trend Trend CSB/31548 combination blade, 48 teeth
8.8/10about £37.00
View offer

Teeth, hook, and the marked speed

Tooth count comes after bore and diameter. Trend labels 24 teeth as a coarse rip with a +15° hook, 48 teeth as a combination with the same hook, and 72 teeth as a fine finish. The 72-tooth amazon title says +10°, and other UK shop pages disagree. The BGS row is 30 teeth and does not say rip or crosscut. A US 10-inch chart is not a 315 mm rule. Marked maximum speed must sit at or above the spindle speed. BGS states 4,200 rpm. The Trend and Draper amazon rows here do not. A cracked body, or missing tips, is scrap. The trade-off is on the tooth count page.

What this set does not tell you

The BGS details field says Metal and the bullets never name wood. A UK firewood review is not a materials specification. Draper rows name wood and sheet goods, then leave kerf, hook, plate, and rpm blank. The Trend rows state kerf and hook and still omit rpm. One UK review of the 48-tooth blade put the old disc back after a day. A 5.0 from five ratings is thinner evidence than 4.6 from 95. On 21 October 2026 Trend's shop listed the CSB/31548 at £113.69, amazon.co.uk showed £37.00, and Machine Mart showed £32.99. Who should buy which listing is on the best 315mm blade page.

Common questions

Does a 315 mm blade with a 30 mm bore fit every table saw?
No. Diameter, bore, plate, kerf, and marked speed all have to suit the manual. Trend bullets name the Makita 2712 and the Metabo TKHS 315 C and M, and still say many more. A 305 mm disc, or a 25.4 mm bore, is a different part.
How thick should the riving knife be?
HSE wants the knife thicker than the plate and thinner than the kerf, and within 8 mm of the blade at table level. A knife set for a 3.2 mm kerf can be wrong for a 3.0 mm kerf. The smallest blade should still be at least 60 per cent of the largest the saw is designed for.
What does the maximum rpm on the blade have to clear?
The figure marked on the blade has to be at or above the saw's spindle speed. The BGS listing states 4,200 rpm. The Trend and Draper amazon rows here do not. Trend's page for the 48-tooth blade states 6,000 rpm, which is a shop figure, not an amazon field. Use the 50 Hz speed in your manual.
Why does one listing say Metal when the others say wood?
The BGS details field says Metal, and the bullets do not name a workpiece. Trend and Draper bullets name wood and sheet goods. One UK review uses the BGS blade on firewood for about two hours a week and reports about four months. That review does not prove the blade cuts steel.
Can a loose reducing ring make a 30 mm bore fit a smaller arbor?
Only a fixed reducing ring, and only to take a bore down onto a smaller arbor. A ring cannot open a 30 mm bore, and it cannot turn a 305 mm blade into a 315 mm blade. If the plate is cracked, scrap it.

Related pages

254mm x 30mm circular saw blade

315mm x 30mm circular saw blade

Best 315mm table saw blade 30mm: which job it suits

How to change a table saw blade on a 315mm bench saw

Makita 2712 blade size: the 2 mm body limit checked

Circular saw blade tooth count: 24, 30, 48, 72, 96

Sources

Public UK sources and the amazon.co.uk listings compared on this page. Updated 22.10.2026.

  1. HSE: circular saw benches (retrieved 21 October 2026)
  2. HSE WIS16: circular saw benches (retrieved 21 October 2026)
  3. HSE: wood dust (retrieved 21 October 2026)
  4. HSE: woodworking standards, including BS EN 847-1 (retrieved 21 October 2026)
  5. Makita 2712 manual (retrieved 21 October 2026)
  6. Trend CSB/31524, CSB/31548 and CSB/31572 (retrieved 21 October 2026)
  7. Draper 24969 TCT circular saw blade (retrieved 21 October 2026)
  8. amazon.co.uk Trend CSB/31548 (retrieved 21 October 2026)