R32 Cross Bit Description
R32 Cross Bits and R32 X Bits are specifically engineered for the most demanding top hammer drilling environments. Unlike standard button bits, the cross and X-type blade designs are the superior choice for fractured, fissured, or loose rock formations where “sticking” is a common risk.
By utilizing premium 45CrNiMo1V alloy steel and high-grade tungsten carbide inserts, these bits offer exceptional durability and impact resistance. The robust blade geometry ensures excellent hole cleaning and maintains superior hole straightness, making them indispensable for mining, quarrying, and tunneling projects.
Features
High-Grade 45CrNiMo1V Steel: The bit body is forged from 45CrNiMo1V alloy steel, providing the perfect balance of hardness and toughness to resist fatigue and body breakage.
Anti-Sticking Design: The Cross and X-type blade configurations prevent the bit from getting wedged in rock fissures, a common issue in complex geological conditions.
Precision R32 Threading: Fully compatible with standard R32 drill rods and top hammer systems, ensuring maximum energy transfer and reduced thread wear.
Optimal Hole Straightness: The symmetrical blade design helps guide the bit straight through the rock, reducing deviation in deep hole drilling.
Wear-Resistant Inserts: Equipped with premium carbide inserts (16×10mm) that maintain their cutting edge longer in abrasive formations.
Specification
R32 Cross Type & X Type Insert Bits
| Type | Insert D (mm) | Insert D (inch) | Insert (H×T) | Thread | Product Code | Weight (kg) |
|---|---|---|---|---|---|---|
| Cross | 50 | 2 | 16×10 | R32 | 158-5016-5410 | 1.0 |
| Cross | 55 | 2 1/16 | 16×10 | R32 | 158-5516-5410 | 1.2 |
| Cross | 60 | 2 3/8 | 16×10 | R32 | 158-6016-5410 | 1.2 |
| X | 55 | 2 1/16 | 16×10 | R32 | 168-5516-5410 | 1.2 |
| X | 60 | 2 3/8 | 16×10 | R32 | 168-6016-5410 | 1.2 |
Application
R32 Cross Type & X Type Insert Bits are designed for top hammer drills in:
Tunneling & Drifting: Ensuring precise hole alignment in fractured ground.
Mining: Excellent for production drilling in complex ore bodies.
Quarrying: Ideal for primary blast hole drilling where rock layers are inconsistent.
Civil Engineering: Used for rock bolting and foundation reinforcement in unstable soil/rock conditions.
Maintenance
Blade Sharpening: Do not wait until the carbide inserts are completely flat. Regular sharpening of the blades maintains penetration speed and prevents stress on the 45CrNiMo1V body.
Thread Protection: Always use high-quality thread grease. Check threads for wear or galling before every use to prevent stripping the R32 connection.
Flushing Check: Ensure the center flushing hole is clear. Poor flushing leads to “re-grinding” of debris, which rapidly wears down the inserts.
Rotation Speed: Adjust rotation speeds according to rock hardness. Excessive speed in hard rock can cause heat-checking on the carbide inserts.
FAQ
While button bits are excellent for solid rock, R32 Cross and X bits are specifically designed for fractured or fissured rock formations. The continuous blade design prevents the bit from getting stuck (clamping) in rock cracks, ensuring better hole straightness and more reliable performance in complex geological conditions.
45CrNiMo1V is a high-grade alloy steel known for its exceptional impact toughness and fatigue resistance. In top hammer drilling, the bit body must withstand thousands of high-frequency impacts per minute; this material ensures the bit body remains intact without premature cracking or breakage, significantly extending the service life of your tools.
According to our standard specifications:
R32 Cross Bits: Available in diameters of 50mm (2"), 55mm (2 1/6"), and 60mm (2 3/8").
R32 X Bits: Available in diameters of 55mm (2 1/6") and 60mm (2 3/8"). All models feature a standard 16×10mm insert size to ensure consistent drilling performance.
Yes. These bits are manufactured with standard R32 threads, making them fully compatible with all international standard R32 drill rods and top hammer drifters. This ensures a tight connection and efficient energy transfer from the rock drill to the bit.
While both are insert-type bits, the X-design provides a slightly different contact pattern with the rock, which can further reduce the risk of bit stucking in extremely loose or fragmented ground. Both designs utilize high-quality carbide inserts and the robust 45CrNiMo1V body to handle high-impact drilling.