Threaded Button bits

Your Professional Thread Button Bit Manufacturer

MSD (Zhuzhou Jingde Machinery Co., Ltd.) is a China-based rock drilling tools manufacturer with 23+ years of experience, specializing in thread button bits, taper button bits, DTH hammers, and complete top hammer drilling solutions for mining, quarrying, tunneling, and construction applications.

What Is a Thread Button Bit?

A thread button bit is a rock drilling bit designed for medium to deep hole applications using threaded connections that enable extension rod assembly. Unlike taper bits limited to single-rod shallow holes, thread button bits connect to extension rods through precision-machined threads, allowing drilling to depths of 20 meters or more. The threaded connection provides superior torque transmission for large-diameter holes and heavy-duty hydraulic drilling rigs.

Thread button bits are available in R-Thread (rope thread), T-Thread (trapezoidal thread), and ST-Thread (super trapezoidal) configurations, covering hole diameters from 33mm to 152mm. Common applications include underground drifting, bench drilling, quarry production, surface mining blast holes, and large-scale civil engineering.

Top Hammer Energy Transfer System

In top hammer drilling, energy is transmitted from the rock drill to the bit face through stress waves traveling along the drill string. Understanding this energy chain is critical for optimizing drilling performance:

Hydraulic Rock Drill: Generates high-frequency stress waves (impact energy) and rotational torque.

Shank Adapter: Directly receives piston impact. Must be extremely tough to transmit kinetic energy without loss to the drill rod.

Coupling Sleeve: Connects shank adapter to rod, or rod to rod. (Note: MF male-female rods eliminate the need for coupling sleeves.)

Extension Rod / MF Rod: Transmits energy through tens of meters of rock formation to the bit.

Thread Button Bit: The terminal point of the entire chain, releasing concentrated stress waves instantly to fracture rock.

Energy Loss Principle: Every joint in the drill string loses approximately 3-5% of transmitted energy. This is why MF (Male-Female) rods are preferred over standard rods with couplings—they eliminate one joint per connection, significantly improving penetration rates.

MSD Design Advantages

Dual-Hardening Heat Treatment: MSD applies a proprietary two-stage hardening process: full carburizing followed by localized induction hardening. This creates a surface with extreme abrasion resistance while maintaining a tough, ductile core that absorbs high-frequency impact waves. According to MSD factory tracking data from 2025, our body breakage rate is strictly controlled below 0.1%.

Deep-Seated Cold Pressing: Using premium YK05/YK06 grade tungsten carbide with precision-controlled interference fit cold pressing, MSD achieves exceptional button retention. Under extreme drilling conditions, insert breakage rate remains below 1% and insert fallout rate below 0.05%.

Optimized Retrac Skirt Design: Retrac (retractable) bits feature special cutting grooves and extended guide bodies on the rear skirt. This design not only ensures straight holes during drilling but also enables the bit to cut through collapsed rock debris during retraction. Field testing at a Canadian quarry demonstrated that MSD Retrac design reduces stuck drill string incidents by over 90%.

Thread Button Bit Applications

Underground Drifting & Tunneling: Development headings, crosscuts, and tunnel excavation require reliable thread systems that can handle extension rods for deeper reaches. R25, R28, R32, and R35 threads dominate this application space.

Bench Drilling & Quarry Production: Production blast holes in quarries demand efficient drilling with consistent hole quality. T38, T45, and T51 systems deliver the penetration rates and hole straightness required for optimal fragmentation.

Surface Mining Blast Holes: Large open-pit mining operations require heavy-duty T51, ST58, ST60, and ST68 systems for deep blast hole drilling with maximum diameter capability.

Civil Engineering & Construction: Foundation drilling, rock anchoring, and construction blast holes benefit from the versatility and reliability of thread button bit systems.

When to Choose Thread vs Taper Systems

Choose Thread When: Hole diameter ≥45mm, deep holes requiring extension rods, using medium to heavy hydraulic drill rigs, higher torque transmission needed, maximum penetration rates required.

Choose Taper When: Hole diameter ≤45mm, shallow single-rod holes, using handheld pneumatic drills (YT24/YT28), fastest bit change speed required.

MSD Thread Button Bit Product Range

R-Thread Series (Drifting & Tunneling):

R25: 33-45mm diameter. R28: 38-45mm diameter. R32: 43-76mm diameter. R35: 48-57mm diameter. Available in Flat Face and Drop Center designs, Normal and Retrac body types.

T-Thread Series (Bench Drilling):

T38: 64-89mm diameter. T45: 70-115mm diameter. T51: 89-127mm diameter. Industry standard for medium to large production drilling.

ST-Thread Series (Heavy-Duty):

ST58: 89-102mm diameter. ST60: 92-140mm diameter. ST68: 102-152mm diameter. Maximum capability for large-scale mining operations.

All MSD thread button bits feature Spherical, Ballistic, and Conical button options to match specific rock conditions.

Proven Field Performance

Aggregate Quarry, Ontario, Canada: MSD T51-89mm Retrac Button Bits with T51 MF Rods deployed in highly fractured, abrasive limestone. The quarry faced severe stuck drill string problems—the fractured ground caused frequent hole collapse, trapping standard flat-bottom bits during retraction. Weekly fishing operations consumed significant downtime.

Results: 92% reduction in stuck drill incidents—Retrac rear-cutting capability enabled bits to drill out of fractured zones. 15% improvement in hole straightness—extended guide skirt provided superior directional control, improving blast fragmentation. Significant productivity gains—elimination of fishing operations restored full drilling availability.

Why Drilling Contractors Trust MSD Thread Bits

MSD thread button bits combine dual-hardening heat treatment, deep-seated cold pressing, and optimized Retrac design to deliver the industry's lowest failure rates: body breakage<0.1%, insert breakage <1%, insert fallout <0.05%, and 90%+ reduction in stuck drill string incidents with Retrac. Trusted by 500+ drilling contractors in 40+ countries, we deliver OEM-grade quality at China factory pricing from Zhuzhou, China's tungsten carbide capital.

Why Partner with MSD?

Beyond manufacturing, we provide complete drilling solutions. Our engineers analyze your project's geology, drilling depth, hole diameter, and equipment specifications to recommend the ideal thread type, body design, face design, and button shape combination. By optimizing the entire system including extension rods and coupling selection, we help you achieve the lowest possible cost per meter and maximum drilling efficiency. With a massive inventory and agile production, we ensure your project stays on schedule. Trust MSD for reliable tools and expert support that drive your profitability.

Technical content reviewed by MSD Engineering Team. | About MSD: Zhuzhou Jingde Machinery Co., Ltd. — 23+ years of thread button bits manufacturing expertise | ISO 9001 Certified | Serving 500+ contractors in 40+ countries