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Your cart is empty. Product advantages:
(1) The sharp edge begins to drill immediately with less force and eliminates "steping" on the work surface.
(2) Holds better than generic high-speed steel, cobalt gives high-speed steel more heat and wear resistance.
(3) This drill bit set is made of high quality cobalt ($80,000 per ton).
(4) M42 cobalt metric drill bits can cut stainless steel and hard metal, hardwood, although it can be used for softer materials such as aluminum, plastic.
Some important tips on drilling stainless steel and hard metal:
(1) The drilling speed control from 200 to 1000 rpm will make it easier for you to drill holes on stainless steel.
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Stainless Steel
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Drilling diameter: 1 rpm.
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≤ 5mm - 1000~700
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5-10 mm 700~350
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10-15mm - 350~200
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Add stainless steel tapping oil or engine oil to prevent the stainless steel from overheating and forming a very hard oxide layer. It also works for adding vinegar, soy sauce or water if you don't have motor oil.
Client d'
Reviewed in France on September 3, 2024
Percé 150 trous avec un forêt
MICK686
Reviewed in the United States on September 21, 2024
These things cut through the steel, pretty easy I couldn’t be happier with these.
ramonmartinez
Reviewed in Spain on September 19, 2024
Las usé para hacer agujeros en un pasamanos de hierro de unos 5 mm. y han aguantado bastante bien, no se ha partido ninguna.
Thomas Schwarz
Reviewed in Germany on September 16, 2024
Der Test steht leider noch aus.
TOM C.
Reviewed in the United States on August 24, 2024
4 of 5 broke during first hole drilled. 1 lasted for 6 holes. Very brittle
Andrea
Reviewed in the United States on August 12, 2024
Outstanding out of the box.... could not ask for a quicker cleaner cut.
johnjo
Reviewed in the United States on November 9, 2024
no as good on stainless steel as I had hoped
FRANCESCO
Reviewed in Italy on October 31, 2024
punte favolose
Naikikoul
Reviewed in France on August 22, 2023
J’ai pris ces forêts de 3,3 mm pour percer des mains courantes en inox pour les fixer sur des supports ad hoc après taraudage.Ils sont vraiment excellents : avec un seul j’ai pu percer sans souci 8 trous d'affilée alors qu’un Bosch à 5% de Cobalt ne perçait plus après un seul trou.
Darrellb
Reviewed in the United States on July 10, 2023
This company makes bits as good as any top brand...even better than most I'd say....you will not be disappointed with them
Great purchase
Reviewed in the United States on March 27, 2023
Best drill bits ever. Nice case and very sharp --
tom
Reviewed in the United States on June 14, 2022
My new favorite drill bits... these cut through thick steel plating easily and are fairly sturdy. I bought extra pack, because despite all efforts, these small ones will break off. I highly reccommend these Cobalt Stroton drill bits... work much better than many other brands that I have tried and last.
Hunter Harris
Reviewed in the United States on April 18, 2021
Punched through super-hardened steel like it wasn’t even there. Much better than alternative choices for M42 bits.
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