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4.2mm metric m35 cobalt steel extremely heat resistant twist drill bit of 2pcs with straight shank to cut through hard metals such as stainless steel and cast iron, 5% cobalt m35 grade hss-co logo

4.2Mm Metric M35 Cobalt Steel Extremely Heat Resistant Twist Drill Bit Of 2Pcs With Straight Shank To Cut Through Hard Metals Such As Stainless Steel And Cast Iron, 5% Cobalt M35 Grade HSS-CO Review

5

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Average

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$$
Revainrating 4 out of 5  
Rating 
3.9
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Details

MaterialM35 Cobalt High Speed Steel
Finish TypeTitanium
Shank TypeStraight
Cutting Angle String135 Degrees
BrandLingGan

Description of 4.2Mm Metric M35 Cobalt Steel Extremely Heat Resistant Twist Drill Bit Of 2Pcs With Straight Shank To Cut Through Hard Metals Such As Stainless Steel And Cast Iron, 5% Cobalt M35 Grade HSS-CO

Cobalt Steel - Manufactured From M35 5% Cobalt Steel, With Molybdenum And Cobalt Added To Creates A Hardened Alloy, Measuring Rockwell Hardness Up To 65, For Much Faster Cutting And Extra Longer Life Span, With Up To 10 Times When Compared with an Average HSS Drill Bit. HSS Titanium Coating - Classic HSS Construction With Titanium Coating For Capability And Durability. The Cutting Edge Is Hardened And Honed For Sharpness. Flutes Form - 2 Flutes Form Helps Clear Chips And Debris Away From The Bit, Decreasing Friction And Heat For A Faster, Cooler Drilling Process, Chatter-Free Design With Staggered Cutting Teeth Ensure The Precise Countersinking And Hole Smooth Clean. Straight Shank And 135° Point Angle - Straight Shank For Standard Drill Chucks And Collet Chuck To Hold Firmly, Assuring Accurate Centering; Helical Flute For Swarf To Easily Get Out; Ideal For General Purpose Drilling Applications. For Metalworking - Particularly Successful In Cutting Through Hard Metals(Hardness Less Than Hrc38°) Such As Stainless Steel And Cast Iron, Although They Can Be Used For Softer Materials Like Copper And Aluminium, Too. Not For Hardened Steel And High Carbon Steel.

Reviews

Global ratings 5
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    2
  • 3
    0
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Type of review

Revainrating 5 out of 5

It worked well as expected

I needed to drill some holes in a 3mm-thick steel plate. It was super easy and fast with this drilling bit. I used a metal screw to punch a small mark at the drilling position first before I started drilling.

Pros
  • Flutes Form - 2 Flutes Form Helps Clear Chips And Debris Away From The Bit, Decreasing Friction And Heat For A Faster, Cooler Drilling Process, Chatter-Free Design With Staggered Cutting Teeth Ensure The Precise Countersinking And Hole Smooth Clean.
Cons
  • Can be more difficult to sharpen than other types of drill bits.

Revainrating 5 out of 5

Drills correct diameter and round hole.

I used it for drilling brass. I drill an accurate diameter hole. It has a reasonable finish. I can add no other comments as it has not been used long enough to evaluate it.

Pros
  • The bit withstood some heavy drilling and did the job I bought it for, drilled some steel with it.
Cons
  • Can be difficult to find replacement bits in some areas.

Revainrating 1 out of 5

No tapered end for drill chuck

Impossible to use unless you have a rotary hammer with a wanted to chuck because even a half inch hammer drill won't fit 14mm. I've never seen a big drill bit like this not be tapered down to fit a drill so I returned it because it's impossible to use

Pros
  • Tools & Home Improvement
Cons
  • May not cut as smoothly as some other types of bits.

Revainrating 4 out of 5

decent product in my review

this is a decent quality. Is slightly smaller than 9.4 mm closer to 9.35mm with digital caliper. Still works. Thanks for attention.

Pros
  • For the price you can’t go wrong
Cons
  • May be too expensive for those on a tight budget.

Revainrating 4 out of 5

Drills well in metal. Accurate sizing.

I needed to install a roof rack on my truck which required drilling 12 holes in the roof. Once I got started, I discovered that I had to drill through 2 layers to get the appropriate depth, not just one. But this drill bit went through the second layer just easily as the first. I ended up with 12 very clean holes. They were perfectly sized, as the inserts I was using went in nice and snug.If you're needing to drill for a GM truck roof rack, the this is the correct size drill bit for the Rivnut…

Pros
  • have not used it yet.
Cons
  • May not be suitable for those without much experience using power tools.