Cobalt Holesaws – Premium – Dart
From £3.83£4.60 EX VATINC VAT
Premium M42 grade 8% cobalt HSS holesaws from Dart. Constant pitch tooth pattern reduces chatter on thin sheet metal and cuts cleanly through stainless steel. Available in a wide range of sizes from 14mm up to 210mm.
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| Size | Price | QTY |
|---|---|---|
| 121mm | £24.60£29.52 | |
| 127mm | £27.99£33.59 | |
| 111mm | £19.72£23.66 | |
| 14mm | £3.83£4.60 | |
| 16mm | £3.83£4.60 | |
| 19mm | £3.95£4.74 | |
| 20mm | £4.07£4.88 | |
| 25mm | £4.91£5.89 | |
| 29mm | £5.99£7.19 | |
| 32mm | £5.99£7.19 | |
| 35mm | £6.59£7.91 | |
| 38mm | £6.83£8.20 | |
| 41mm | £7.43£8.92 | |
| 44mm | £7.55£9.06 | |
| 51mm | £8.15£9.78 | |
| 64mm | £9.59£11.51 | |
| 65mm | £9.59£11.51 | |
| 67mm | £9.59£11.51 | |
| 70mm | £9.95£11.94 | |
| 76mm | £10.43£12.52 | |
| 79mm | £10.55£12.66 | |
| 83mm | £10.79£12.95 | |
| 102mm | £14.39£17.27 | |
| 105mm | £17.75£21.30 | |
| 114mm | £20.39£24.47 | |
| 140mm | £29.75£35.70 | |
| 152mm | £29.99£35.99 | |
| 177mm | £34.79£41.75 | |
| 210mm | £39.59£47.51 | |
| 200mm | £37.19£44.63 |
The Dart cobalt holesaw is built for cutting metal that would eat through a standard bimetal saw in short order. Made from M42 grade HSS with 8% cobalt content, these are the ones you reach for when stainless steel, hardened sheet, or awkward alloys are on the job sheet. The cobalt content raises the heat resistance of the steel significantly, which means the teeth stay sharp longer and the saw keeps cutting where cheaper options give up.
The constant pitch tooth pattern is what sets these apart from a budget holesaw. On thin sheet metal in particular, variable pitch can cause the teeth to bite unevenly and produce that irritating chatter that walks the saw off line and leaves a rough edge. A consistent pitch keeps the cut smooth, reduces vibration, and gives you a cleaner hole with less finishing work. Anyone who has ever tried to cut a clean circle in a stainless steel panel will know exactly why this matters.
Where the Dart Cobalt Holesaw Earns Its Keep
These are a serious tool for serious applications. Electricians cutting through steel consumer unit backplates, plumbers working with stainless pipework, fabricators drilling fixing holes in mild or stainless sheet. The wide size range, from 14mm right up to 210mm, means you can get the specific size you need rather than settling for something close. That said, they are more than capable on softer materials too, though spending money on cobalt to cut timber or plastic would be a bit like using a racing tyre on a forklift.
M42 Grade Steel
M42 is a high-speed steel alloy with a cobalt addition that improves red hardness, meaning the cutting edge holds its temper even when heat builds up at the tip. This is the grade used in professional quality drills and taps for a reason. For repetitive or production work on metal, the longer tool life easily justifies the slightly higher outlay per saw compared to standard bimetal options.
Available individually across the full size range, so you can buy exactly what the job needs without committing to a kit of sizes you may never use.
Pro Tip: Use cutting fluid or even a drop of light oil on the pilot drill and saw teeth when cutting stainless, it dramatically reduces heat build-up and keeps the teeth sharp for far longer.
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