What sizes are available for 3 blades pdc bit

When it comes to water well drilling, mining exploration, or geological surveys, the 3 blades PDC bit is one of the most versatile and widely used tools in the industry. With its three-wing design and polycrystalline diamond compact (PDC) cutters, this type of PDC bit offers an excellent balance of cutting efficiency, stability, and cost-effectiveness. But one of the most common questions from drilling professionals is: what sizes are actually available? Understanding the full range of diameters helps you match the right bit to your project requirements, rig specifications, and target formation. In this article, we break down the complete size range of 3 blades PDC bits, from compact diameters for small-scale jobs to large bits for heavy-duty drilling.

Overview of 3 Blades PDC Bit Size Range

A 3 blades PDC bit is typically available in diameters ranging from approximately 60mm (2.4 inches) to over 300mm (12 inches), with the most commonly ordered sizes falling between 75mm and 200mm. The three-blade configuration is especially popular for non-coring drilling applications because the open design allows for efficient cuttings removal and stable penetration in soft to medium-hard formations. Manufacturers like Xi'an Heaven Abundant Mining Equipment Co., Ltd. offer a comprehensive selection of pdc drill bit products in steel body and matrix body constructions, giving customers flexibility in both size and material choice.

Small Diameter Sizes: 60mm – 94mm (2.4" – 3.7")

Small-diameter 3 blades PDC bits are ideal for residential water wells, geological exploration, and narrow-bore mining applications. These compact bits are lightweight, highly maneuverable, and compatible with smaller drilling rigs that have limited torque and weight capacity. The most common sizes in this category include:

These smaller sizes are particularly popular among drilling contractors who need a reliable PDC bit for soft to medium formations such as clay, sandstone, and shale. The steel body construction commonly used in this size range keeps costs low while still delivering solid penetration rates. For example, a 65mm steel body 3 blades PDC bit can drill effectively through surface soil and weathered rock layers at depths of up to 100 meters.

Medium Diameter Sizes: 113mm – 153mm (4.5" – 6.0")

The medium diameter range is the most popular category for 3 blades PDC bits, covering the majority of water well drilling and mining applications. These sizes provide an optimal balance between drilling speed, hole diameter, and equipment compatibility. The available sizes in this range include:

The 6-inch (152mm) 3 blades PDC bit is a workhorse in the water well industry. It is large enough to accommodate submersible pumps and deliver adequate water flow for residential and small agricultural use, yet compact enough to be handled by most mid-size drilling rigs. Many contractors also prefer the 113mm size for mining blast holes and hard formation drilling, where the concentrated weight on fewer cutters improves penetration rates in challenging rock conditions.

Large Diameter Sizes: 190mm – 216mm+ (7.5" – 8.5"+)

For large-scale drilling projects such as deep agricultural wells, geothermal installations, and large-diameter water supply systems, the 3 blades PDC bit is available in sizes exceeding 190mm. These larger diameters require more powerful drilling rigs with higher torque and weight capacity, but they offer significant advantages in flow rate and drilling efficiency for the right applications:

It is worth noting that for diameters above 216mm, some manufacturers may recommend switching to a 4-blade or 5-blade PDC bit configuration for enhanced stability. However, the 3-blade design remains a valid and cost-effective option for soft to medium formations at these larger sizes, especially when drilling through clay, mudstone, or unconsolidated sediments where the open blade design helps prevent balling.

Steel Body vs. Matrix Body: How Size Affects Material Choice

When selecting a 3 blades PDC bit, the body material is an important consideration that often correlates with diameter size. TY Drill Bits offers both steel body and matrix body options across its size range:

• Steel Body: Most common in the small to medium size range (60mm–153mm). Steel body bits are machined from high-grade alloy steel and offer excellent toughness and impact resistance. They are more cost-effective and can be repaired or refurbished. The 65mm, 94mm, 113mm, and 133mm steel body 3 blades PDC bits are among the most frequently ordered sizes.
• Matrix Body: Available from 65mm and up, matrix body construction is particularly valuable in larger diameters (130mm+) and abrasive formations. The tungsten carbide matrix material is highly resistant to erosion and wear, making it a preferred choice for drilling through sandy or gravel-rich formations. TY Drill Bits offers matrix body 3 blades PDC bit options in 65mm, 75mm, 98mm, and 133mm sizes.

How to Choose the Right Size for Your Project

Selecting the correct diameter from the available size range depends on several practical factors. Here is a quick guide to help you match the right size to your specific drilling scenario:

1. Define Your Target Hole Diameter: The bit diameter should match the final hole size required for your casing or pump installation. For a standard 4-inch PVC casing, a 113mm–130mm bit is typically appropriate.

2. Consider the Formation: In soft formations like clay or sand, larger diameters (130mm–200mm) can be used effectively. In harder formations like limestone or granite, smaller diameters (65mm–113mm) concentrate the available weight on fewer cutters for better penetration.

3. Check Rig Compatibility: Verify that your drilling rig can handle the weight and torque requirements of your chosen bit diameter. Larger bits require more powerful rigs, and drill rods must be properly sized to connect securely.

4. Evaluate Cost Efficiency: While larger bits may drill faster, they also cost more upfront and wear faster in abrasive conditions. Calculate the cost-per-foot for your specific project to determine the most economical size.