Skip to content
Contact Us Jewelry School Partners Frequently Asked Questions Submit Tax Exemption
Busch Carbide 70 Hart Burs Fig 446AU 3/32" Shank .90mm-2.30mm-By the Piece - Otto Frei
Busch Carbide 70 Hart Burs Fig 446AU 3/32" Shank .90mm-2.30mm-By the Piece - Otto Frei
Busch Burs

Busch Fig 446AU Carbide 70 Hart Burs 3/32" Shank .90mm-2.30mm By the Piece

Part # BAU118.611 Out of Stock Weight -- lb / -- g
$21.95
Volume pricing
Total qty Discount Per unit You save
1 — $21.95 —
2 – 3 5% off $20.85 $1.10
4 – 11 7% off $20.41 $1.54
12 + 10% off $19.75 $2.20
Add 1 more for 5% off, saves another $1.10 each.
Bur Size: 1.10mm

Sold by the piece, Busch Fig 446AU carbide 70° hart burs are designed for cutting clean, accurate stone seats in prongs on precious and hard metals. The sharp carbide blades bite smoothly into the metal, providing a controlled, predictable feel at the handpiece.

Features

  • 70° hart profile engineered specifically for cutting prong seats for stone setting.
  • Carbide construction for extremely long service life compared to steel or tungsten vanadium burs.
  • Suitable for use on platinum, titanium, steel, and standard gold alloys.
  • Precision Busch blade geometry provides aggressive yet controllable cutting action.
  • Calibrated diameter range to match common prong and stone seat dimensions.

Specifications

Property Value
Bur Type 70° hart bur, Fig 446AU
Application Cutting stone seats in prongs
Material Carbide
Diameter Range 0.90–2.30 mm (0.035–0.091 in)
Shank 3/32 in (approx. 2.38 mm)
Recommended Speed 2,000–10,000 RPM
Sold By Piece
Manufactured In Germany
Brand Busch

Available Options

Part # Diameter
BAU118.609 0.90 mm (0.035 in)
BAU118.610 1.00 mm (0.039 in)
BAU118.611 1.10 mm (0.043 in)
BAU118.612 1.20 mm (0.047 in)
BAU118.613 1.30 mm (0.051 in)
BAU118.614 1.40 mm (0.055 in)
BAU118.615 1.50 mm (0.059 in)
BAU118.616 1.60 mm (0.063 in)
BAU118.617 1.70 mm (0.067 in)
BAU118.618 1.80 mm (0.071 in)
BAU118.619 1.90 mm (0.075 in)
BAU118.620 2.00 mm (0.079 in)
BAU118.621 2.10 mm (0.083 in)
BAU118.622 2.20 mm (0.087 in)
BAU118.623 2.30 mm (0.091 in)

Notes

  • Carbide burs offer the longest service life compared with tungsten vanadium and high-speed steel burs.
  • Use light, controlled hand pressure and let the bur do the cutting, especially in very hard alloys.
  • Other Busch carbide shapes are available separately: Fig 414AU 90° hart bur (Part # BAU118.509) and Fig 413AU traditional setting bur (Part # BAU118.808AU).
California Prop 65 Warning California Prop 65 Warning:
Cancer and Reproductive Harm. www.P65warnings.ca.gov.
Brand
Busch Burs
Part #
BAU118.611
Type
Burs
Dimensions
3.4 in x 2 in x 0.25 in
Property Value Bur Type
70° hart bur, Fig 446AU
Application
Cutting stone seats in prongs
Material
Carbide
Diameter Range
0.90–2.30 mm (0.035–0.091 in)
Shank
3/32 in (approx. 2.38 mm)
Recommended Speed
2,000–10,000 RPM
Sold By
Piece
Manufactured In
Germany