US No. 1159 Busch Carbide Straight Fissure (Cylinder) Round Bur | Busch No. 21R 014 – FG | Pack of 6

Busch No. 21R 014 – FG (US No. 1159) is a round-end (domed) carbide cylinder fissure bur with a 1.4 mm (ISO 014) head on an FG shank for high-speed turbine handpieces. It is the chairside, friction-grip counterpart to the HP-shank 21R 014 offered for laboratory straight handpieces. Pack of 6, manufactured in Germany by Busch & Co. GmbH.

Why choose the FG version

A domed cylinder in a high-speed turbine is typically used when a preparation calls for rounded internal line angles — for example in adhesive composite cavities or when refining walls without creating stress-concentrating corners. The 1.4 mm head sits between the 21 012 and 21 016 flat cylinders in width; its FG shank fits standard air-turbine and electric high-speed handpieces with water spray.

Also available: No. 21 012 – RA, No. 21 010 – FG, No. 21 010 – RA, No. 21 012 – FG, No. 21 016 – FG, No. 21 016 – HP, No. 21R 014 – HP.

Product Details

This instrument is classified as a Carbide, Cylinder Round, Excavating and Fissure Bur, conforming to the following ISO standard classification:

• ISO: 500 314 137 006 014
• US Reference: No. 1159
• Shank Type: FG (Friction Grip)
• Pack Quantity: 6 burs per pack

Applications

The carbide cylinder round fissure bur is specifically suited for the following clinical procedures:

• Cavity/Fissure Preparation — ideal for defining and refining cavity walls and fissure areas with precision and control
• Excavation of carious tissue
• General tooth preparation requiring a cylinder round cutting geometry

The cylinder round profile of the carbide cylinder round fissure bur provides flat-bottomed cavity preparations with well-defined walls, making it a reliable choice for restorative dentistry workflows.

Key Features

• Premium carbide construction for long-lasting cutting efficiency
• Consistent flute geometry for smooth, controlled cutting action
• FG shank compatible with standard high-speed handpieces
• Manufactured in Germany to exacting quality standards

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.

FAQ

What shank type does this bur use? This bur features an FG (Friction Grip) shank, compatible with standard high-speed dental handpieces.

How many burs are included per pack? Each pack contains 6 individual carbide cylinder round fissure bur units.

What is the ISO classification for this instrument? The ISO classification is 500 314 137 006 014.

Compare With

Manufacturer literature: Busch catalogs and product brochures for this line are available in our Busch Burs Catalog Library.