Rock Drilling Tools: A Complete Guide to Thread Button Bits, DTH Hammers, and Sourcing from China

What Are Rock Drilling Tools?

Rock drilling tools are consumable components used in percussive and rotary-percussive drilling to break and penetrate hard rock formations. They cover a broad range of products: top hammer tools (thread button bits, tapered bits, drill rods, shank adapters), down-the-hole (DTH) hammers and bits, and related accessories. The two most common systems in mining, quarrying, and construction are the top hammer system and the DTH system. Each has its own strengths depending on hole diameter, depth, and rock hardness.

Thread Button Bits: The Standard for Top Hammer Drilling

A thread button bit is a percussive drill bit with tungsten carbide buttons pressed into a steel body. It connects to the drill string via a threaded interface — typically R25, R32, T38, T45, or T51 — and relies on the impact energy transmitted through the drill rod to crush rock.

Thread button bits are available in several configurations to handle different drilling conditions:

Standard (Flat Face) Bits — Ideal for soft to medium-hard rock. The flat face design delivers efficient energy transfer and fast penetration rates.

ｄｒｏｐ Center Bits — The concave face design helps center the bit in the hole, reducing deviation. Well suited for medium-hard formations.

Retrac (Retractable) Bits — Featuring a rear reaming section, these bits are designed for drilling in fractured or loose ground where the hole wall may collapse. They allow the drill string to be pulled back safely.

Thread button bits range from 45mm to 127mm in diameter and are commonly used in underground mining, tunneling, quarrying, and bench drilling. TY Drill Bits offers a full line of thread button bits covering R25 through T51 thread sizes, with both spherical and ballistic carbide button shapes to match different rock hardness levels.

DTH Drilling Tools: Power and Precision for Deep Holes

When hole depth exceeds 25 to 30 meters, or when hole straightness is critical, top hammer systems lose efficiency. This is where DTH drilling tool technology shines. In a DTH system, the hammer sits directly behind the bit at the bottom of the hole. Compressed air drives the piston inside the hammer, striking the bit directly. Since the impact energy does not travel through the drill rods, energy loss is minimal regardless of depth.

DTH drilling tools include:

DTH Hammers — Available in low-pressure, medium-pressure, and high-pressure configurations. High-pressure hammers (typically 10–25 bar) deliver the highest penetration rates in hard rock.

DTH Bits — Fitted with carbide buttons in convex, concave, or flat face designs. Common shank types include DHD3.5, DHD340, COP44, QL50, and BR series.

DTH Drill Rods — Heavy-walled tubes with API-standard threaded connections (e.g., API 2 3/8" Reg) that deliver compressed air to the hammer while rotating the bit.

DTH tools excel in water well drilling, borehole drilling, foundation piling, and large-diameter quarry blasting. TY Drill Bits supplies DTH hammers and bits from 70mm to 152mm, compatible with major hammer brands including DHD, COP, QL, and SD series.

How to Choose the Right Rock Drilling Tool

Selecting the correct tool depends on four key factors:

Rock Formation and Hardness — Soft formations (shale, claystone) call for aggressive bit designs with fewer, larger carbide buttons. Hard, abrasive formations (granite, quartzite) require more buttons with smaller diameters and higher carbide grades to resist wear.

Hole Diameter and Depth — For holes under 127mm and depths under 25m, top hammer thread button bits are cost-effective. For deeper holes or larger diameters, DTH tools deliver better straightness and penetration rates.

Drilling Rig Compatibility — Always match the thread type (R32, T38, T45, T51) and shank design to your rig's specifications. Mismatched connections cause premature failure and safety hazards.

Air Pressure and Flow Rate — DTH hammers are designed for specific pressure ranges. Using a high-pressure hammer with a low-pressure compressor results in poor performance, and vice versa.

Why Source Rock Drilling Tools from China

China has become the world's largest manufacturing hub for rock drilling consumables. Reasons buyers worldwide choose Chinese suppliers include:

Cost Advantage — Chinese manufacturers offer competitive pricing without sacrificing quality, thanks to vertically integrated production and lower labor costs. Savings of 30% to 50% compared to Western brands are common.

Wide Product Range — A single Chinese supplier like TY Drill Bits can provide thread button bits, DTH hammers and bits, drill rods, shank adapters, PDC bits, tricone bits, and core bits — simplifying your supply chain.

OEM and Customization — Most Chinese manufacturers offer OEM services, allowing you to source tools under your own brand or with custom specifications tailored to your local market.

Fast Lead Times — With standard lead times of 15 working days or less, Chinese manufacturers can respond quickly to urgent orders and maintain consistent stock availability.

About TY Drill Bits: Your Trusted Partner for Rock Drilling Tools

Xi'an Heaven Abundant Mining Equipment CO.,LTD (TY Drill Bits), founded in 2010 and based in Xi'an, Shaanxi, China, is a manufacturer and trade company specializing in mining and drilling consumables. The company holds ISO9001 certification and exports 91% to 100% of its production to international markets, with annual sales of US$1 Million to US$2.5 Million.

The product portfolio covers the full range of drilling needs: thread button bits (R25/R32/T38/T45/T51), DTH hammers and bits, PDC bits, tricone bits, diamond core bits, carbide drag bits, drill rods, and cutting tools for road milling, trenching, and mining. With OEM services, flexible payment terms (L/C, T/T, PayPal, Western ｕｎｉｏｎ), and multiple trade terms (FOB, CFR, CIF, EXW), TY Drill Bits is well positioned to serve distributors, drilling contractors, and mining companies worldwide.