Concrete drill bits are known by various names, including masonry drill bits, hammer drill bits, carbide-tipped drill bits, SDS drill bits, rotary hammer drill bits, and percussion drill bits. In this article, we will explore the different sizes of concrete drill bits.

Diameter drill bit size chart

The diameter of a concrete drill bit is its most fundamental specification. This measurement determines the size of the hole that the bit will create, typically given in millimeters. Concrete drill bit diameters generally range from 6 mm to 100 mm. Common sizes include 8mm, 10mm, 12mm, 14mm, 16mm, 17mm, 18mm, 20mm, 22mm, 25mm, 28mm, 30mm, 32mm, 35mm, 38mm, 40mm, 45mm, and 50mm. The diameter of the drill bit dictates the hole size: larger diameters produce larger holes but reduce the power tool’s speed, while smaller diameters create smaller holes and allow for higher tool speeds.

Length Specifications of Concrete Drill Bit Size Chart

Concrete drill bits come in various lengths, typically including 280mm, 320mm, 340mm, 370mm, 400mm, 450mm, 500mm, 600mm, 800mm, and 1000mm. The appropriate length should be chosen based on the required drilling depth.

concrete drill bit size chart
concrete drill bit size chart

Connector type

Concrete drill bits come with various connector types, including triangular wedge joints (TTG), tapered joints, square joints (SDS), and hexagonal joints (Hex). The SDS connector is the most common, known for its quick connection and disassembly, making it easy to replace.

When selecting a concrete drill bit, it’s essential to consider the specific working conditions. The primary factors include the hardness and density of the concrete to be drilled, followed by the size and depth of the hole required, and the duration of the drilling operation. Based on these considerations, you can choose the appropriate specifications such as diameter, length, and connector type to ensure optimal efficiency and safety during the work.


Specifications of concrete drill bits encompass diameter, length, and joint type. Selecting the appropriate specifications based on specific working conditions can enhance both efficiency and safety. When choosing a concrete drill bit size, consider factors such as the hardness and density of the concrete, the required hole size and depth, and the duration of the drilling task.

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