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

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

Part # BAU128.407 4 In Stock Weight <0.1 lb / <5 g
$20.15
Drill Size: .70mm
Volume pricing
Total qty Discount Per unit You save
1 – $20.15 –
2 – 3 5% off $19.14 $1.01
4 – 11 7% off $18.74 $1.41
12 + 10% off $18.13 $2.02
Add 1 more for 5% off, saves another $1.01 each.

Availability Sold out

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Description

The Busch 4205S short carbide twist drills are purpose-built for one critical application: drilling precise holes in hard metals for pavé diamond setting. The short length is intentional — pavé holes are relatively shallow, and longer drills are prone to breakage under torsional stress. These drills deliver the control and reliability that exacting stone-setting work demands.

Developed through a partnership between Busch of Germany and the world's finest micro-diamond setters, the 4205S series has become the go-to solution for what was once a drill-breaking nightmare. These carbide twist drills are trusted by setters working for the most prestigious jewelry names in the industry.

The 2-groove design actively expels material from the hole during drilling, reducing heat buildup and extending drill life. Suitable for use on platinum, high-karat white alloys, titanium, steel, gold, silver, and other metal alloys. Not for use with glass, ceramics, or gemstones. Also available as a kit of four — see part number BAU128.400.

Features

  • Short-length design minimizes torsional stress and reduces drill breakage during pavé setting work
  • Solid carbide construction for use in hard metals including platinum, titanium, and high-karat white alloys
  • 2-groove geometry expels swarf from the hole, extending drill life and improving hole quality
  • Developed in collaboration with professional micro-diamond setters and Busch of Germany
  • Suitable for gold, silver, platinum, titanium, steel, and other metal alloys
  • Sold individually — choose only the size you need

Specifications

Shank Diameter 3/32"
Drill Type 2-Groove Short Carbide Twist Drill
Series Busch 4205S
Recommended Speed 3,000–5,000 RPM
Sold As By the piece
Not For Use On Glass, ceramics, or gemstones

Available Options

Part # Drill Size
BAU128.407 0.70mm
BAU128.408 0.80mm
BAU128.409 0.90mm
BAU128.410 1.00mm

Specifications

Brand
Busch Burs
Part #
BAU128.407
Type
Drills
Dimensions
2 in x 0.05 in x 0.05 in
Shank Diameter
3/32"
Drill Type
2-Groove Short Carbide Twist Drill
Series
Busch 4205S
Recommended Speed
3,000–5,000 RPM
Sold As
By the piece
Not For Use On
Glass, ceramics, or gemstones
California Prop 65 Warning California Prop 65 Warning:
Cancer and Reproductive Harm. www.P65warnings.ca.gov.

Reviews · 1

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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.