Best 40 mm Forstner bit
Updated: 2026-10-23
Best is the wrong word if you want one bit for every cupboard, hand drill and oak worktop. A 40 mm Forstner bit in this amazon.co.uk set is a conditional fit: a long review trail, rank 1, or a set that also contains 35 mm. This page says which listing to open, and who should skip it. Prices and review counts are in the [40 mm Forstner bit comparison](/hub/drilling-and-accessories/forstner-bit-40mm). The Products Compared editorial team used those listings on 20 October 2026. A qualifying purchase can earn us a commission at no extra cost to you.
Best is the wrong word if you want one bit for every cupboard, hand drill and oak worktop.
Best is the wrong word if you want one bit for every cupboard, hand drill and oak worktop. A 40 mm Forstner bit in this amazon.co.uk set is a conditional fit: a long review trail, rank 1, or a set that also contains 35 mm. This page says which listing to open, and who should skip it. Prices and review counts are in the 40 mm Forstner bit comparison. The Products Compared editorial team used those listings on 20 October 2026. A qualifying purchase can earn us a commission at no extra cost to you.
Our top picks
| Badge | Product | Listed diameter | Tip stated | Machine note | Note | Price | Offer |
|---|---|---|---|---|---|---|---|
| Best overall |  TA-VIGOR TA-VIGOR 40 mm, carbide tip | 40 mm | Tungsten carbide | Bench drill, vertical drill or CNC; water on hardwood | 7.0 | about £9.46 | View offer |
| Alternative |  HSAWBIT HSAWBIT 40 mm, hex | 40 mm (minimum bore 39 mm) | High-speed steel | Hand drill or bench press; no impact driver | 6.3 | about £12.99 | View offer |
 ASNOMY ASNOMY 40 mm, carbide tipped | 40 mm (minimum bore printed as 1.56 inches) | Tungsten carbide tipped | Above 40 mm, listing prefers a fixed drill or a vice | 8.5 | about £11.89 | View offer |
On this page
What this page can call a strong fit
Eleven amazon.co.uk listings include a 40 mm cutter. Singles run from £8.68 to £14.99. Review counts run from 1 to 2,476. HSAWBIT's rank 1 in Forstner Bits is Amazon's list position, not a counted test of the rim. A strong fit means the diameter lines agree, the machine note matches your drill, and the sample includes complaints. Conflicts on diameter and steel are on the 40 mm Forstner bit buying guide.
A large review trail versus rank 1
Open ASNOMY, at £11.89 with 4.3 from 2,476 reviews, when you have a drill press or a vice. Bullets and table both say tungsten carbide, the shank is 10 mm, and drilling depth is stated as 60 mm. One buyer abandoned a hand drill after a grab. Skip it if you cannot clamp the work.
Open HSAWBIT, at £12.99 with 4.6 from 287 reviews, if you will stay off an impact driver. It allows a hand drill or a bench press and tells you to wear eye protection. Reviews include plywood and burning in hardwood. The minimum-bore line says 39 mm beside a 40 mm cutter.
The set and the thin price
Open the YOKOCUT set, at £18.72 with 4.2 from 148 reviews, when you need 35 mm and 40 mm together. Sizes run from 30 mm to 60 mm on hex shanks, with YG8 carbide spurs in the bullets. Reviews include blunt MDF, walking until a pillar drill, and a chipped 60 mm edge. Skip it for one hole: 720 g of sizes you may not clamp by hand.
TA-VIGOR, at £9.46 with 4.7 from 28 reviews, agrees on 40 mm and carbide. The usage line is a bench drill, a vertical drill or a CNC router, not a hand drill. Shank diameter and cutting depth are not stated.
Thin files and named bits outside
Skip Flintronic at £8.99 when a 41 mm line sits against a 40 mm title. Leave this set for Bosch's EXPERT Wood 40 mm at £45.80, or a Famag Bormax 2.0 at £42 including VAT, when hardwood on a press is the whole job. Those pages are a price ceiling, not scored rows. A higher price does not turn a 40 mm cutter into a 35 mm cup.
Common questions
Which 40 mm bit has the most reviews?
ASNOMY, at 4.3 from 2,476 amazon.co.uk reviews and £11.89. HPHOPE is next at 748 reviews, then HSAWBIT at 287. The count is the listing line. Some texts on the ASNOMY and HSAWBIT pages name other diameters from the same brand, so the figure is not a pure tally of 40 mm holes. It is still the largest sample in this set.
Which listing is rank 1 in Forstner Bits?
HSAWBIT's listing shows rank 1 in Forstner Bits, at £12.99 with 4.6 from 287 reviews. Rank is Amazon's category list in the file, not a count of cuts and not a certificate. ASNOMY has far more reviews and is not that rank-1 line. Use rank as a popularity signal, then read the 39 mm minimum-bore line and the impact-driver ban before you buy.
Is the cheapest bit the best value?
Not on one review. FBBEVWBK is the cheapest single at £8.68 and shows 5.0 from one rating, with a review title that says "Not happy". TA-VIGOR at £9.46 has carbide in the bullets and the table, an agreed 40 mm diameter, and 4.7 from 28 reviews, which is a clearer bargain if you have a bench drill. Cheap and unreviewed is a spec purchase. It is not a verdict on edge life.
Should I buy the set if I also need 35 mm?
Yes, if you will use more than one size and you can put the larger bits in a pillar drill. The YOKOCUT set at £18.72 includes 35 mm and 40 mm. Skip it when the only hole you need is 40 mm, or when blunt-MDF reviews and a chipped 60 mm edge are enough to send you to a single bit with a larger review sample.
When is a Bosch or Famag bit the better spend?
When you want a named 40 mm catalogue bit and the amazon.co.uk listing in front of you disagrees with itself, or when hardwood on a press is the whole job. Bosch's EXPERT Wood 40 mm is listed at £45.80, and a Famag Bormax 2.0 40 mm is listed at £42 including VAT at Elsons. They are outside this scored set. They do not remove the need to clamp the work and keep the rim slow.
Can a 4.8 score from six ratings win?
No. YUEDAHOMEE is 4.8 from six ratings at £12.99, and one review describes a 35 mm bit rather than the 40 mm title. Six ratings cannot outrank 2,476 reviews that include both praise and grab warnings. A high average on a tiny sample is a reason to measure the bit, not a reason to treat it as the strongest record.
Related pages
Sources
Public UK sources from the research digest, last checked on 20 October 2026. Shelf prices and star lines are the amazon.co.uk figures in the product display for this comparison.
- HSE: PPE overview (retrieved 20 October 2026)
- Consumer Rights Act 2015, section 19 (retrieved 20 October 2026)
- Bosch Professional UK, 40 mm Forstner bit 2 608 577 019 (retrieved 20 October 2026)
- Hart Wholesale, Blum 71B3550 (retrieved 20 October 2026)
- Furnica, 35 mm hinge cup guide (retrieved 20 October 2026)
- Katz-Moses Tools, Forstner speeds (US shop, rule of thumb) (retrieved 20 October 2026)
- Famag Tool UK, classic 40 mm Forstner bit (retrieved 20 October 2026)
- amazon.co.uk listings for the ASINs in this comparison (retrieved 20 October 2026)