What Is a Cross Bit and How Is It Used in Drilling?

When it comes to rock drilling, Cross Bit is a popular choice for many mining and construction projects. But what exactly is it, and why do professionals prefer it for certain applications? Let’s explore its features, types, and uses.

What Is a Cross Bit?

A cross bit is a type of drill bit designed with a cross-shaped insert made from durable materials like tungsten carbide. Its cutting edges are arranged in a “+” pattern, which makes it effective for breaking hard rock and maintaining drilling direction. This design also helps with better flushing of drill cuttings, reducing the risk of clogging.

Types of Cross Bits

Cross bits come in different designs and angle configurations to match various drilling needs. Two common variations include:

• 11° Cross Bit – Offers a sharper cutting angle, making it suitable for medium to hard rock formations where higher penetration speed is desired.

• 12° Cross Bit – Provides a slightly different cutting geometry, ideal for specific rock conditions that require balance between speed and stability.

How Is a Cross Bit Used?

Cross bits are commonly used in:

• Mining exploration to drill blast holes

• Quarrying to extract dimension stone

• Construction projects involving rock excavation

• Tunneling where precision and durability are critical

The choice of cross bit depends on the rock hardness, drilling equipment, and required hole size.

Advantages of Using Cross Bits

• Durability – Made with wear-resistant materials for extended life

• Versatility – Works well in different rock formations

• Directional Stability – Maintains hole alignment during drilling

• Easy Maintenance – Regrinding can extend its service life