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STROTON 5% Cobalt M35 Drill Bits Set for Stainless Steel (1/16"-1/2",17PCS)
Why choose STROTON cobalt drill bits?
The research shows that HSS with M35 cobalt has a higher temperature resistance and Red hardness, a greater wear resistance(Hardness) and a higher heat treat response than HSS without cobalt .
- Red hardness, it causes the hardened steel to have an ability to maintain hardness at approximately 860-880 ℃.
- 66-69 HRC,it means that the drill bits has 3X cutting ability and 3X durability.
- This drill bits set is made of Premium Cobalt (80,000 dollars per ton).
Truly Made of 5% Cobalt Alloy Steel
- This drill bits set definitely have more cobalt in them than the "Cobalt" bits that HF sells--which are just Cobalt coated or only a tiny amount of cobalt tipped.
- Compared with ordinary high speed steel, 5% cobalt provides better heat and wear resistance,and Hold up Better.
3X Drilling Efficiency + 3X Tool Life
- Split Point desigh tip starts drilling immediately with less force and eliminates "walking" across the work surface.
- Ideal for Stainless steel,Hardened Steel,Cast Iron,Aluminum,Copper,Plastic and Hardwood.
- The drill bit can be used for mechanical maintenance, such as drilling out bolts and screws.
Be vertical to the workpiece
- Non-vertical use may cause the drill bit to break.
- Using a drill press with sufficient power will make drilling easier.
Keep low speed:200 to 1000 RPM
- Too high speed may burn the bit tip.
- Drill bits diameter：
- 1/16≤3/16，RPM（1000~700）
- 3/16-3/8， RPM（700~350）
- 3/8-1/2， RPM（350~200）
Use cutting fluid to stay cool
- Add Cutting Fluid or engine oil to prevent the stainless steel from overheating.
- It also works adding some vinegar, soy sauce or water.
Remain steady and patient
- The drilling shall be started slowly by applying force slowly and gently until the drill bit starts chipping.
Customer
Reviewed in the United States on February 15, 2025
Bought for work. Sharp, nice quality, sturdy case, and nice selection of sizes.
terrence trask
Reviewed in the United States on February 24, 2024
ive been trying off and on to drill thruogh a snowblaower auger shaft for a while and ruined a few bits and a lot of time to get a 1/4" into this 1.5 " shaft i ordered these bits and using oil every 10 to 15 seconds was through it in about 1.5 minuts! wow if you want high quality bits buy them they are very inexpensive and the best Ive ever used!!
Charles Mackenzie
Reviewed in the United States on November 14, 2024
Held up drilling pipe
Crystal Hipple
Reviewed in the United States on October 7, 2024
So far these are working great. Used to to drill holes for rivets while replacing rocker panels. I broke 4 other bits before switching these and they worked really well. I did break 1 of the 1/8 after 8 holes so we'll see how good the warranty is.
Rod
Reviewed in Canada on October 20, 2024
Seemed like a decent set with a good container, unfortunately some of the bits have been used and broken or damaged then switched. I can only assume it was at manufacturing location. Somebody needs to step up quality control as well as replace workers somewhere along this process. Sad that people act like this.
Md
Reviewed in the United States on April 19, 2024
Excellent bits. Should you ever find yourself drilling a bunch of small holes in titanium at a low speed with cutting oil these blow right through. Spent a bunch of money on Milwaukee titanium coded drill index that wouldn’t cut got hot and lost their edge.
happy harry
Reviewed in the United States on April 11, 2024
Not along lasting as hoped
Mark Massingill
Reviewed in the United States on August 31, 2023
Edit:The seller responded to me immediately and made it right. I do appreciate how swiftly the stepped up and that they did not give me any run around or hassle. I can honestly say Stroton does stand behind their products. For this reason, I updated the review to 3 stars. I still had a bad experience with the product but I had an excellent experience with the seller.Original review:Fist use, I drilled a 7/64 pilot hole into a head bolt that had snapped off in the block, I was happy with the performance of that bit, drilling and removing broken torque to yield head bolts was the reason I bought these bits. However, as soon as I stepped up to the 1/4 bit to drill the final size for the extractor I was using I ran into problems, the cutting edges of the bit snapped off the bit tip as soon as they grabbed, never even really dug in, just heard a crunch as soon as I started the drill. I've been welding, drilling and working with metal for decades, I've never had a bit break like this, where the tip just crumbled as soon as the bit started to grab. I was manually drilling, with an 18v drill, starting the drill slowly with very little pressure and using a cutting oil. The bit is still full length, the center point is intact, the sharpened cutting edges just broke off as thin flakes as soon as I started the drill. I wouldn't recommend these bits. I don't care what their warranty is, if you cannot use a bit, if they are that poor of a quality, do you really want to have to put jobs on hold waiting on replacements that might not be any better in quality? The set comes with two 1/4 inch bits, I didn't even bother to try the other one. I wouldn't trust it to be any better in quality. My guess is that the bit was overheated during their sharpening process, making the tip overly brittle so that the cutting edges just snapped away as soon as any cutting pressure was applied.I got these cobalt bits specifically for drilling into the harder metal of the broken torque to yield head bolts that broke on removal, leaving the threaded portion in the block. Now I'm out the cost of the bits and still have 5 broken bolts to remove. It's a nice case but it's full of bits I cannot trust. Don't waste your money.
scott pelton
Reviewed in the United States on April 24, 2023
Probably similar to most titanium coated 6% cobalt M35 split point bits. What stands out is the very well designed plastic case. Much sturdier and easier to use than the cheap, thin metal cases others use that don't close properly and the bits all jumble up and fall out. They also include a spare 1/16, 3/32, 1/8, 1/4" bits in case you break one. They also offer to replace any bit should you even damage/break it - free. Haven't needed this yet. Seems to be the better buy in this price range. much better than previous sets I've purchased. Love the case, it even has a real hinge and separate insert drill holders - holds bits tightly. Great buy!
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