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Busch 4205S 2 Groove Short Carbide Twist Drills 3/32" Shanks-0.70mm to 1.0mm-By the Piece

Part # BAU128.407
Original price $20.15 - Original price $20.15
Original price
$20.15
$20.15 - $20.15
Current price $20.15
Availability:
2 in stock, ready to be shipped
Availability:
3 in stock, ready to be shipped
Availability:
4 in stock, ready to be shipped
Availability:
4 in stock, ready to be shipped
Drill Size: .70mm

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Product Details

These Busch 4205S short carbide twist drills are made for just one application: Drilling precise holes in hard metals for pave diamond setting. Short drills make sense because the holes drilled are relatively shallow and long drills have a tendency to break due to torsional stress.

These short carbide burs are used by the world’s finest micro-diamond setters who set stones for the world’s greatest jewelry brand names. Developed by a partnership between those parties and Busch of Germany, these drills are the perfect solution for once was a drill breaking nightmare.

Use these drills on hard metals such as platinum, high karat white alloys, titanium, steel as well as gold, silver and other alloys. The 2-groove design helps expel material from the hole extending drill life. Recommended speed for use: 3,000-5,000 rpm. Not for use with glass, ceramics or gemstones. These carbide twist drills are sold by the piece. Also available in a kit of 4, see part number BAU128.400.

Choose from 4 sizes:
  • BAU128.407  0.70mm
  • BAU128.408  0.80mm
  • BAU128.409  0.90mm
  • BAU128.410  1.00mm

Sold by the piece



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Customer Reviews

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A
Anonymous
good, but an experts tool

Carbide drill bits are wonderful in the way they just kind of melt through metals like platinum or harder white golds. Clean, bright cuts, round holes. No dull drills. But, and it's a big but, these things are more than just a little fragile. While the short length helps, they're still very easy to break with even a slight error. When I first tried these, I managed about two holes per drill before breaking them. I've gotten better. But use them gently, well braced so you don't bend or torque them, and at high speed only (very important). Much more than carbide burrs, you really need to use them at high speeds and with a precise touch, or they'll not last long enough to justify their higher cost. Don't forget a good lube. If/when you break them, if the broken tip is stuck in the metal, it can be dissolved with fresh pickle, just like a high speed steel bit.