Xi'an Heaven Abundant Mining Equipment CO.,LTD
From Thread Button Bits to DTH Hammers — Everything You Need to Know Before You Buy
Whether you're running a mining operation, a quarry, a civil construction project, or a water well drilling business, the performance of your rock drilling tool fleet directly impacts your bottom line. A wrong bit choice can slow penetration rates, increase downtime, and drain your consumables budget. This guide walks you through the major categories, how they work, where they shine, and how to ｓｅｌｅｃｔ the right tools for your ground conditions.
Rock drilling is not a one-size-fits-all operation. The hardness of the formation, the hole diameter and depth required, the type of drill rig you operate, and even environmental conditions all influence which tool will deliver the best results. A bit that excels in soft limestone may fail prematurely in hard granite, and a hammer designed for shallow holes will struggle at depth.
The good news is that today's manufacturers — including Xi'an Heaven Abundant Mining Equipment Co., Ltd. (TY Drilling Bits), a China-based specialist with over 15 years of experience — offer a comprehensive range of rock drilling tools engineered for specific applications. The key is matching the tool to the job.
Quick Fact
TY Drilling Bits supplies drilling equipment to customers across 91%–100% of export markets, holding ISO9001 certification and offering OEM customization for specialized projects.
Thread button bits are the most common type of top-hammer rock drilling bit. They feature a threaded shank that screws onto extension drill rods, and a face studded with tungsten carbide buttons that crush the rock under repeated percussive blows from the drifter. They are used with both hydraulic and pneumatic rock drills.
Thread button bits come in a variety of standard thread sizes, each suited to different hole diameters and rock conditions:
| Thread Size | Typical Bit Diameter | Common Applications |
|---|---|---|
| R25 | 43 – 64 mm | Small-hole drilling, underground mining, narrow-vein work |
| R32 | 45 – 76 mm | General-purpose mining, tunneling, bench drilling |
| T38 | 64 – 102 mm | Medium-to-large hole quarrying, construction blasting |
| T45 | 76 – 115 mm | Large-hole mining, production blasting |
| T51 | 89 – 152 mm | High-capacity production drilling, hard rock |
The arrangement and shape of the carbide buttons on the bit face also matter:
DTH (Down-The-Hole) drilling places the percussion hammer directly behind the bit, at the bottom of the hole. Unlike top-hammer drilling, where impact energy travels down the drill string and loses strength with depth, DTH delivers full force to the rock regardless of hole depth. This makes DTH drilling tools the preferred choice for deep boreholes, water wells, and large-diameter production blasting.
DTH hammers are generally classified by air pressure and valve design:
DTH bits are available in a wide range of diameters (typically 76 mm to 152 mm and beyond) with various face designs — flat face, convex face, and ｄｒｏｐ center — matched to rock hardness and desired penetration rate. Tungsten carbide buttons provide the cutting edge, just as with thread button bits, but the larger bit diameter means more buttons and more energy per blow.
Tapered button bits use a tapered (conical) connection rather than threads, making them quick to change and well-suited for handheld pneumatic rock drills. They are the go-to choice for small-hole drilling in underground mining, tunneling, and stone quarrying where portability and simplicity matter most.
Common taper angles include 7° and 11° (7 degree and 11 degree), with bit diameters ranging from 32 mm up to around 45 mm. Tapered bits are typically used with integral drill rods or tapered drill steels in short-hole applications.
When you need to drill large-diameter holes through mixed or very hard formations, tricone bits (also called roller cone bits) are a proven solution. TCI (Tungsten Carbide ｉｎｓｅｒｔ) tricone bits feature three rotating cones studded with carbide buttons, crushing and grinding the rock as the bit turns. They excel in deep water well drilling, oil and gas exploration, and hard formation rotary drilling.
PDC bits (Polycrystalline Diamond Compact bits) use synthetic diamond cutters bonded to tungsten carbide substrates, shearing through rock with a continuous cutting action rather than percussive blows. PDC bits deliver extremely high penetration rates in soft to medium formations and are widely used in water well drilling, coal mining, and geological exploration. They come in steel-body and matrix-body constructions, with 3-blade, 4-blade, and multi-blade designs.
When you need to retrieve core samples rather than just drill a hole, diamond core bits are essential. Available in electroplated, impregnated, TSP (Thermally Stable Polycrystalline), and surface-set diamond configurations, they cover the full range of geological formations from soft sedimentary rock to hard granite. Core sizes follow standard wireline systems such as AQ, BQ, NQ, HQ, and PQ.
Start with a geotechnical assessment. Is the rock soft, medium, hard, or very hard? Is it abrasive? Is it fractured or solid? Hard, abrasive rock demands high-quality carbide buttons and a flat-face bit design for longer life. Soft, homogeneous rock lets you use a more aggressive button pattern for faster penetration.
| Hole Depth | Small Diameter (<76 mm) | Medium Diameter (76–127 mm) | Large Diameter (>127 mm) |
|---|---|---|---|
| Shallow (<10 m) | Tapered button bit | Thread button bit (R32/T38) | DTH hammer bit |
| Medium (10–50 m) | Thread button bit (R32) | Thread button bit (T38/T45) | DTH or tricone |
| Deep (>50 m) | Thread button bit (T45/T51) | DTH hammer bit | DTH or tricone bit |
Your rig's percussion power, rotation speed, and air capacity must match the tool you choose. A DTH hammer that requires high air pressure will underperform if paired with an undersized compressor. Similarly, a T51 thread button bit needs a heavy-duty drifter; running it on a light rig wastes both the bit and the drill.
The cheapest bit is not always the most economical. A premium bit may cost more upfront but drill significantly more meters before needing replacement, reducing downtime and labor costs. When comparing suppliers, consider bit life per meter drilled, not just the purchase price.
Quality varies widely among rock drilling tool manufacturers. Look for:
Even the best rock drilling tools wear out faster if not properly maintained. Follow these practices to maximize bit life:
Founded in 2010 and based in Xi'an, Shaanxi, China, Xi'an Heaven Abundant Mining Equipment Co., Ltd. (operating as TY Drilling Bits) is a specialized manufacturer and supplier of drilling equipment for mining, water well, geological, and construction applications. With an annual export rate of 91%–100% and ISO9001 certification, the company has built a solid reputation for delivering reliable tools at competitive prices.
Product Spotlight
TY Drilling Bits' rock drilling tool lineup includes thread button bits in R25, R32, T38, T45, and T51 threads; DTH hammers and bits (CIR, DHD, QL, and BR series); tapered button bits; drill rods; shank adapters; and handheld rock drills — all backed by quality-controlled manufacturing and a knowledgeable sales team.
Choosing the right rock drilling tool is a balance of rock conditions, hole requirements, equipment compatibility, and budget. By understanding the differences between top-hammer and DTH systems, thread and tapered connections, and the various bit designs available, you can make informed decisions that improve drilling efficiency and reduce operating costs.
Whether you need a single replacement bit or a full set of drilling consumables for a large project, working with an experienced supplier makes all the difference. TY Drilling Bits combines deep product expertise, a broad catalog, and factory-direct pricing to help you get the job done right.
Contact the TY Drilling Bits team today for a free consultation and quote. With over a decade of experience serving mining, quarrying, water well, and construction customers worldwide, they'll help you ｓｅｌｅｃｔ the best tools for your specific drilling conditions — at competitive factory-direct prices.
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