Busch® Bur Sets - Cup Fig 77b

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The Busch® 77B Cup shaped burs are great for rounding the end of wires and prong tips because of the cutting teeth which are on the inside of the concave shell. Also know as concave cutters. Features precision machined, uniformly spaced multiple teeth for accurate and smooth cutting. Made of tungsten vanadium steel for strength and durability. Use with a lubricant such as Gesswein Lube-Stik (see related products) to facilitate cutting and prolong tool life.

The 3/32" shanks measure approximately 1.75" long. Maximum operating speed varies with bur size. Please consult with ANSI (American National Standards Institute) for speed recommendations.

See the charts below to see the four sets and which burs are available in each set. Made in Germany.

Item #121-1135
Set of 12, 008-019
cup set Set of 12 round burs
Bur Size: 008 009 010 011 012 013 014 015 016 017 018 019
Working Diameter: (mm) 0.80 0.90 1.00 1.10 1.20 1.30 1.40 1.50 1.60 1.70 1.80 1.90
Inner Working Diameter: (mm) 0.56 0.63 0.72 0.80 0.88 0.96 1.05 1.15 1.25 1.33 1.40 1.48
Working Length: (mm) 0.65 0.70 0.75 0.78 0.90 0.98 1.05 1.10 1.20 1.28 1.35 1.42
Item #121-1130
Set of 12, 010-031, Popular Sizes
cup set Set of 12 round burs
Bur Size: 010 012 014 015 016 018 021 023 025 027 029 031
Working Diameter: (mm) 1.00 1.20 1.40 1.50 1.60 1.80 2.10 2.30 2.50 2.70 2.90 3.10
Inner Working Diameter: (mm) 0.72 0.88 1.05 1.15 1.25 1.40 1.65 1.85 2.00 2.20 2.35 2.55
Working Length: (mm) 0.75 0.90 1.05 1.10 1.20 1.35 1.55 1.70 1.85 2.00 2.15 2.30
Item #121-1140
Set of 8, 020-031
cup set Set of 12 round burs
Bur Size: 020 021 022 023 025 027 029 031
Working Diameter: (mm) 2.00 2.10 2.20 2.30 2.50 2.70 2.90 3.10
Inner Working Diameter: (mm) 1.55 1.65 1.75 1.85 2.00 2.20 2.35 2.55
Working Length: (mm) 1.48 1.55 1.62 1.70 1.80 2.00 2.15 2.30
Item #121-1145
Set of 8, 035-100
cup set Set of 12 round burs
Bur Size: 035 040 045 050 060 070 080 100
Working Diameter: (mm) 3.50 4.00 4.50 5.00 6.00 7.00 8.00 10.00
Inner Working Diameter: (mm) 2.90 3.35 3.80 4.20 5.10 5.90 6.80 8.60
Working Length: (mm) 2.60 3.00 3.35 3.75 4.30 5.00 5.80 7.30
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