R35 Thread Rock Bit

R35 Rock Bits: Engineered for High-Frequency, High-Power Drilling Systems Modern tunneling and underground mining demand extreme performance from drilling tools. As hydraulic drifters become more powerful, standard bits often suffer from thread deformation or get trapped in loose strata. Gdrills R35 thread button bits are purpose-built to solve these exact operational bottlenecks.

Master Complex Fractured Strata with Our Retrac Design When drilling through faults, joints, or weathered rock layers, collapsing borehole walls are a constant threat. A standard bit can easily become jammed during retraction, leading to expensive tool loss.

The Retrac Advantage: Our R35 Retrac bits feature a specialized, heavy-walled, fluted skirt with reverse-facing cutting teeth.

Effictively Prevents Sticking: If rock fragments fall behind the bit, the backward-cutting profile crushes the debris as you pull the drill string back, ensuring a smooth, hassle-free retraction.

Perfect Hole Straightness: The extended length of the Retrac skirt acts as an integrated guide, significantly reducing hole deviation in non-homogeneous rock.

Metallurgical Excellence Under Extreme Torsional Load How do we achieve our high load capacity? The R35 thread root is the area of highest stress concentration. Gdrills utilizes an advanced localized induction tempering process paired with precision CNC thread milling:

Zero Thread Galling: The optimized thread clearance ensures perfect energy propagation from the R35 Drill Rod down to the rock face, minimizing thermal energy loss.

High Elastic Limit: The core of the bit body remains ductile enough to absorb severe rotational shock waves, preventing catastrophic body splitting.

R35 Top Hammer Rock Bits

High-Impact Load Capacity: Engineered specifically to withstand the intense stress profile of modern 15kW to 25kW high-frequency rock drifters without premature R35 thread failure.

Optional Retrac Design for Broken Formations: Features a heavy-duty Retrac (retractable) skirt with reverse cutting edges, ensuring easy bit retrieval and eliminating stuck-drills in fractured or collapsing rock zones.

Premium Micro-Alloy Steel Body: Forged from high-grade, vacuum-degassed alloy steel to maintain excellent structural fatigue limits under constant thermodynamic impact.

Precision-Matched Thread Profiling: Perfectly calibrated to pair with industry-standard R35 Drill Rods and Coupling Sleeves for optimized energy transfer.

The skirt of the drill bit is made from 45CrNiMoVA alloy steel, which undergoes heat treatment to achieve a hardness level of approximately HRC43–48.

For the carbide buttons, we use either YK05 or Element Six tungsten carbide, depending on customer requirements. YK05 is a widely used, cost-effective grade suitable for standard top hammer drilling applications. 

The carbide button shapes include spherical, ballistic.

Spherical buttons are ideal for hard and abrasive rock due to their excellent durability.

Ballistic buttons provide faster penetration but have lower impact resistance, making them suitable for soft to medium formations.

For superior retention, hot-pressing technology is used to insert the tungsten carbide buttons. This process ensures a secure fit, minimizing the risk of button loss during high-impact operations and significantly extending the bit's service life compared to cold-press methods.

Unsure whether to choose a Drop-Center Face for better straightness or a Flat Face for abrasive rock? Contact our engineering team with your rock drill model and rock hardness (f-value) for a free tailored tooling configuration plan.

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