R25 35mm Threaded Button Bit Dome Spherical Tungsten Carbide Rock Drilling Tool

R25 35mm Threaded Button Bit for Rock Drilling

The R25 35mm dome threaded button bit is a top hammer rock drilling tool engineered for underground drifting, tunnelling and small-hole bench drilling operations. Featuring a normal skirt body and 7 durable spherical tungsten carbide buttons, this rock bit offers high impact toughness, smooth energy transfer and a long service life in medium to hard rock formations.

Product Overview

Equipped with 5 gauge buttons (7mm) and 2 front buttons (7mm), the R25 35mm bit maintains a consistent 35mm hole diameter while improving penetration rates. The dome (spherical) button profile provides high resistance to breakage and wear under high-impact percussion drilling, and the precision-machined, heat-treated alloy steel body ensures strong fatigue resistance and thread longevity.

Main Applications

• Underground Tunnelling & Drifting: Efficient hole drilling for mine development and tunnelling projects in medium to hard rock.
• Small-Hole Bench Drilling: Production drilling in open-pit or underground mining operations.
• Rock Anchoring: Fast and stable drilling for roof support and anchor installation in mining and civil engineering.
• Light-to-Medium Rigs: Easy integration with light-to-medium hydraulic or pneumatic rock drills.

Key Features & Advantages

• Optimized 7-Button Layout: Five 7mm gauge buttons ensure accurate hole diameter retention, while two 7mm center buttons improve penetration rates.
• Dome / Spherical Button Profile: Provides high resistance to breakage and wear under high-impact percussion drilling.
• Heat-Treated Alloy Steel Body: Precision machined and heat-treated body delivers high fatigue resistance and thread longevity.
• Standard Flushing Design: Efficient cuttings removal prevents re-drilling and prolongs bit life.
• Broad Rig Compatibility: R25 thread connection works with top hammer rigs.

Product Specifications

Dome vs Ballistic Buttons

FAQ

Q1: What are the main applications of the R25 35mm dome threaded button bit?
A: It is primarily designed for underground drifting, tunnelling, small-hole bench drilling and anchoring in medium-to-hard rock formations. The R25 thread connection integrates with light-to-medium hydraulic or pneumatic rock drills.

Q2: Why is the 7-button 7mm configuration used for this R25 35mm bit?
A: Five outer gauge buttons protect the outer diameter from excessive gauge wear and maintain a consistent 35mm hole diameter, while two inner front buttons effectively shatter the rock core at the center of the hole.

Q3: How do I choose between a normal skirt and a retrac skirt for an R25 35mm bit?
A: A normal skirt is suitable for general drilling in stable, solid rock, being lightweight and cost-effective with smooth energy transfer. A retrac skirt is designed for fractured, loose or sticky rock to prevent the drill string from jamming during retraction.

Q4: How can I extend the service life of an R25 35mm thread rock bit?
A: Regrind buttons when flat spots reach one-third of the button diameter, ensure adequate air or water flushing pressure to clear cuttings, and maintain correct feed force to prevent thread fatigue failure or premature button breakage.