Busch Shorties Carbide Inverted Cone Bur | Busch No. S 420FX 018 – HP | Pack of 2

The carbide taper (cone) inverted cutter shortie from Busch & Co. GmbH is a precision-engineered rotary instrument designed for demanding material removal tasks across a range of professional applications. Featuring a taper (cone) inverted geometry with a fine double cut, this shortie-style carbide bur delivers controlled, efficient cutting with a refined surface finish.

Product Specifications

• Type: Carbide Cutter, Taper (Cone) Inverted
• Cut: Fine Double Cut
• Style: Shortie
• Standard Classification (ISO): 500 104 010 140 018
• Pack: 2 pieces

Applications

The carbide taper (cone) inverted cutter shortie is well-suited for the following dental laboratory applications:

	Crown and Bridge Technology — Shaping, trimming and finishing of crown and bridge frameworks in the laboratory.
	Plastics Technology — Shaping, trimming and finishing of acrylic dentures and appliances.
	Model Making — Trimming and detailing of plaster and stone models.
	Model Casting Technique — Finishing and adjustment of cast metal frameworks.

Instrument Dimensions

Per ISO 6360, the size number is the maximum head diameter in tenths of a millimeter. See our Busch Bur Size Chart for the full size conversion table, shank codes, and color ring guide.

Why Choose This Instrument

Engineered and manufactured in Germany, this carbide taper (cone) inverted cutter shortie meets the exacting standards expected of Busch & Co. GmbH rotary instruments. The fine double cut geometry reduces chatter and heat build-up, resulting in smooth, accurate material removal. The compact shortie shank design improves access in confined workspaces, making it a practical choice for intricate work in model making, dental laboratory procedures, and plastics fabrication.

Supplied as a pack of two, this instrument offers a cost-effective way to maintain a ready supply of this essential carbide taper (cone) inverted cutter shortie in any professional workshop or dental laboratory setting.

FAQ

What does fine double cut mean? A fine double cut refers to a crosscut pattern on the flutes of the carbide bur that produces a smoother finish compared to a standard single cut, while still providing efficient material removal.

What is the ISO classification for this bur? The ISO classification for this instrument is 500 104 010 140 018.

How many burs are included? This listing includes a pack of 2 carbide taper (cone) inverted cutter shortie instruments.