An R28 cross bit refers to a specific type of drill bit designed for rock drilling applications, especially in mining, tunneling, and construction. The designation "R28" specifies the thread type and size of the bit, and "cross bit" indicates the particular shape of the cutting structure.
Thread Type:
The "R" in R28 stands for "round," indicating that the thread type is circular. The "28" denotes the diameter of the thread in millimeters. R28 is a standardized thread type used in the drilling industry to ensure compatibility with various drilling equipment.
Cross Bit Design:
The term "cross bit" refers to the shape of the cutting structure. Cross bits typically have multiple cutting edges arranged in a cross-shaped pattern. This design is effective for achieving a balance between efficient rock penetration and stability during drilling.
R28 Cross Bit: Precision Drilling Tool for Compact and Controlled Rock Operations
In the field of rock drilling, especially in confined or specialized applications, the R28 cross bit stands out as a high-performance solution. Designed for straight-hole drilling and consistent penetration in medium-hard to hard rock formations, the R28 cross bit combines a compact structure with advanced cutting technology. Its symmetrical cross design ensures directional stability, while the robust R28 thread offers compatibility with lightweight and portable drill systems.
The R28 cross bit is a small-diameter rock drilling tool featuring a cross-shaped tungsten carbide insert layout. It connects via the R28 thread standard, which is known for its stability and compatibility in shallow and narrow-hole drilling environments. With exceptional flushing capacity and strong structural integrity, the R28 cross bit is ideal for applications where space is limited but accuracy and tool durability are critical.
Precision Cross Design
The balanced, cross-type cutting structure of the R28 cross bit enables straight-hole drilling with minimal deviation—essential for roof bolting, support drilling, and geotechnical anchoring.
Premium Tungsten Carbide Inserts
The cutting edges are embedded with high-quality tungsten carbide buttons, offering high abrasion resistance, sharpness retention, and reliable penetration through abrasive rock.
Compact and Lightweight Build
The R28 cross bit is lighter and smaller than larger thread-type bits (like R32 or R38), making it ideal for handheld drills or lightweight mechanized equipment.
Durable Heat-Treated Steel Body
Crafted from high-grade alloy steel, the bit body is heat-treated to withstand high-stress conditions, reducing wear and breakage under impact.
R28 Thread System
The R28 thread connection ensures fast installation, reduced vibration, and seamless energy transmission between bit and rod.
Because of its compact profile and high-precision cutting, the R28 cross bit is widely used in the following areas:
Underground Mining: For short-hole drilling, rock support installations, and tunnel face stabilization.
Tunneling and Civil Infrastructure: Ideal for metro projects, utility tunnel development, and confined-space anchoring.
Geotechnical Engineering: Used in rock bolts, soil nails, and micropile projects requiring accurate hole direction and control.
Construction Sites: Suitable for shallow foundation work, bridge reinforcement, and retrofitting tasks in narrow access points.
Superior Directional Control
The symmetric cross layout ensures accurate drilling with reduced hole deviation—perfect for applications requiring precise alignment.
Extended Service Life
Made with wear-resistant materials and optimized design, the R28 cross bit offers long-lasting use even in abrasive conditions, lowering replacement frequency and downtime.
High Drilling Efficiency
The efficient flushing design combined with aggressive carbide cutting tips results in faster drilling speeds and reduced bit jamming.
Cost-Effective Performance
With high durability and precision, the R28 cross bit contributes to lower operational costs and increased project efficiency.
Broad Compatibility
The R28 threading allows the bit to be used with a wide range of lightweight rigs and handheld pneumatic drills, enhancing its versatility in field operations.
If your project involves tight spaces, shallow drilling, or structural rock support, the R28 cross bit delivers a unique combination of precision, strength, and efficiency. Its compact profile does not compromise on performance, and its ability to produce clean, straight boreholes makes it a preferred choice for professionals in mining, construction, and geotechnical sectors.
Conclusion
In applications where accuracy, durability, and maneuverability are essential, the R28 cross bit offers unmatched performance. Its intelligent design and rugged construction make it a go-to choice for rock drilling tasks that demand precision and reliability. Whether you're anchoring a tunnel ceiling or stabilizing a slope, the R28 cross bit ensures drilling success with fewer disruptions and better results.
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