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Makita B-65399 Impact Gold 14 Pc. Titanium Coating Drill Bit Set, 1/4 In. Hex Shank $11 + Free Shipping w/ Prime or on $35+
$11
$29
62% off
Amazon
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Amazon [amazon.com] has Makita B-65399 Impact Gold 14 Pc. Titanium Coating Drill Bit Set, 1/4 In. Hex Shank on sale for $11
Shipping is free w/ Amazon Prime or on $35+
Description
Shipping is free w/ Amazon Prime or on $35+
Description
- Titanium nitride (TiN) coating lasts 2.5x longer than non-coated bits
- 135 degree split point geometry for faster starts and reduced walking
- Impact rated: For use in 1/4 inches Hex impact drivers
- For drilling holes in ferrous metal, wood, plastic, non-ferrous metal, cast iron and stainless steel
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Community Notes
About the Poster
Amazon [amazon.com] has Makita B-65399 Impact Gold 14 Pc. Titanium Coating Drill Bit Set, 1/4 In. Hex Shank on sale for $11
Shipping is free w/ Amazon Prime or on $35+
Description
Shipping is free w/ Amazon Prime or on $35+
Description
- Titanium nitride (TiN) coating lasts 2.5x longer than non-coated bits
- 135 degree split point geometry for faster starts and reduced walking
- Impact rated: For use in 1/4 inches Hex impact drivers
- For drilling holes in ferrous metal, wood, plastic, non-ferrous metal, cast iron and stainless steel
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15 Comments
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I bought the Dewalt Black and Golds about a month back and I think I will just keep those. $10 for that 14 pc set. Not "Titanium" like these but also not hex shank grafted like these. I've also read that these grafted ones can have more drill runout if they aren't mounted in the hex shank 100% straight.....
I bought the Dewalt Black and Golds about a month back and I think I will just keep those. $10 for that 14 pc set. Not "Titanium" like these but also not hex shank grafted like these. I've also read that these grafted ones can have more drill runout if they aren't mounted in the hex shank 100% straight.....
I believe the titanium coating is designed to prevent oxidation and reduce friction to keep temps lower and structural integrity of the cutting edge intact. The black oxide coating does the same I believe. A bit of cutting oil and a lower RPM is MUCH more important than coating TBH. Most people just go full tilt on hard materials and ruin their bits. Cobalt has higher heat tolerance, but still dramatically underperforms at higher RPMs and without oil. It's night and day. Technique is as important as the tool itself.
Ok rant complete
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I believe the titanium coating is designed to prevent oxidation and reduce friction to keep temps lower and structural integrity of the cutting edge intact. The black oxide coating does the same I believe. A bit of cutting oil and a lower RPM is MUCH more important than coating TBH. Most people just go full tilt on hard materials and ruin their bits. Cobalt has higher heat tolerance, but still dramatically underperforms at higher RPMs and without oil. It's night and day. Technique is as important as the tool itself.
Ok rant complete
Cobalt is harder, but is also more brittle.
Cobalt is harder, but is also more brittle.
Cobalt steel is generally more brittle. However, the project farm testing showed the Bosch 8% cobalt M42 bits took essentially the same torque before cracking as the DeWalt HSS bits did, which was very impressive.
The review also showed the DeWalt HSS couldn't successfully drill harder metal whereas several cobalt easily could. At the same or similar toughness, I think the cobalt, at least the Bosch cobalt bits, are a very attractive value.
Cobalt steel is generally more brittle. However, the project farm testing showed the Bosch 8% cobalt M42 bits took essentially the same torque before cracking as the DeWalt HSS bits did, which was very impressive.
The review also showed the DeWalt HSS couldn't successfully drill harder metal whereas several cobalt easily could. At the same or similar toughness, I think the cobalt, at least the Bosch cobalt bits, are a very attractive value.
I bought the Dewalt Black and Golds about a month back and I think I will just keep those. $10 for that 14 pc set. Not "Titanium" like these but also not hex shank grafted like these. I've also read that these grafted ones can have more drill runout if they aren't mounted in the hex shank 100% straight.....
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