How to Choose DTH Bits for Air Pressure, Rock and Hole Requirements

Start with the air system

Air pressure is the first practical filter for dth bits. Our MC Low Air Pressure DTH Bits are designed for low or moderate air systems operating from 2 to 5 bar. Choose this product when your rig cannot support a high-pressure compressor, when compressor capacity is limited at a remote site, or when controlled air pressure matters during geotechnical and environmental drilling.

The pressure range should match the air available at the rig, not only the pressure setting on the compressor. For a quarry blast hole, foundation anchor, water well or geotechnical borehole, send us the working pressure and air supply details so we can check the fit before you order.

Match the bit to the formation and job

The MC Low Air Pressure DTH Bits are intended for soft to medium-hard rock formations and are used for mining, construction, geotechnical drilling, water wells, blasting holes, shallow oil and gas exploration, and environmental drilling. They suit projects where debris removal and hole control must work within a low-pressure air setup.

Picture a foundation crew drilling through rocky soil with a limited air system. A low-pressure DTH bit can be considered when the required formation falls within the product's soft to medium-hard range. For a geotechnical survey, the same product fits a job where preserving hole integrity and controlling disturbance are important project conditions.

A different check applies to quarrying. If the task is blast-hole drilling, confirm the formation, hole diameter and air pressure together. The application alone does not determine the correct bit. We need the rock condition and rig information before matching the configuration.

Confirm the geometry before ordering

Diameter and face design determine whether the bit matches the planned hole. We can design and manufacture different diameters, hole numbers, carbide button shapes and face shapes according to your requirements. The order information should follow this sequence:

• Shank
• Head diameter
• Face design
• Button shape

The shank must match the down-the-hole hammer. The head diameter should match the required hole size. Face design and carbide button shape should be selected with the rock and drilling purpose in mind. A specification that gives only the phrase “DTH bits” is too general for production planning.

Send a drawing or the existing bit details when replacing a tool. If you are specifying a new hole, include the target diameter, hammer shank, formation, working pressure and drilling application. These details give us a usable basis for selecting the bit geometry.

Choose the MC low-pressure option for constrained air supply

The MC Low Air Pressure DTH Bits are the applicable choice when your project uses 2 to 5 bar air and works in soft to medium-hard formations. The product uses tungsten carbide and high-grade steel, with an airflow design intended for low-pressure conditions. Its listed size availability is multiple sizes, and its drilling scope is shallow to medium depth.

This option suits a remote water-well project where compressor capacity is restricted, a geotechnical survey that needs controlled air pressure, or a quarry that requires blast holes without a high-pressure air system. It also fits construction work such as foundation anchors and tunnel shafts when the formation and hole specification are within the stated range.

The limits are equally important. Do not select this product from the pressure range alone if the rock is outside the soft to medium-hard formation range, if the planned depth is beyond shallow to medium depth, or if the hammer shank and head diameter are unknown. Give us those conditions first, then we can confirm the configuration.

Questions to settle before a quote

Prepare the bit specification

Choose our MC Low Air Pressure DTH Bits when the rig works at 2 to 5 bar and the project involves soft to medium-hard formations within shallow to medium depth. For a quote, send the hammer shank, head diameter, face design, button shape, hole number, formation, air pressure, drilling application and required quantity.