T45 89mm Flat Face Ballistic Button Bit for Rock Drilling
The T45 89mm flat face ballistic button bit is a top hammer drilling tool designed for high-speed bench drilling, open-pit mining and quarrying in soft to medium-hard rock formations. Built on a heavy T45 thread connection with a flat face profile and a 13-button ballistic array, this 3.5-inch bit increases penetration rates while maintaining hole alignment and flushing efficiency.
Product Overview
The conical ballistic carbide shape cuts rock with lower thrust requirements, speeding up drilling cycles in non-abrasive rock. Eight 13mm gauge buttons prevent perimeter wear and hole gauge loss, while five 12mm center buttons accelerate core rock shearing, delivering stable performance in limestone, sandstone and shale formations.
Main Applications
- Bench Drilling: High-speed production drilling in open-pit mines.
- Quarrying: Efficient blast-hole drilling in limestone, sandstone and shale quarries.
- Open-Pit Mining: Production drilling in soft to medium-hard rock formations.
- Production Drilling: Continuous high-speed drilling with modern hydraulic top hammer rigs.
Key Features & Advantages
- High-Penetration Ballistic Buttons: The conical carbide shape cuts rock with lower thrust requirements, speeding up drilling cycles in non-abrasive rock.
- 13-Button Dual-Diameter Array: Eight 13mm gauge buttons prevent perimeter wear and hole gauge loss, while five 12mm center buttons accelerate core rock shearing.
- Flat Face Geometry: Delivers high stability and smooth power transfer from heavy hydraulic drifters, with high fatigue resistance.
- Heavy T45 Thread Body: Forged alloy steel construction ensures high thread fatigue resistance, compatible with top hammer drill rigs.
- Lower Thrust Requirement: Requires less feed pressure from the drill rig to achieve efficient penetration.
Product Specifications
| Thread Connection |
T45 (Top Hammer Heavy Thread) |
| Bit Diameter |
89 mm (3 1/2 inch) |
| Button Type |
Ballistic / Parabolic |
| Button Layout |
13 Buttons: Gauge 13mm x 8 + Front 12mm x 5 |
| Face Design |
Flat Face |
| Skirt / Body Type |
Normal / Standard Body |
| Body Material |
Forged Alloy Steel (42CrMo) |
| Carbide Grade |
High-Penetration Tungsten Carbide |
| Primary Application |
Bench Drilling, Quarrying, Open-Pit Mining in Soft to Medium-Hard Rock |
FAQ
Q1: What are the primary rock drilling applications for a T45 89mm ballistic button bit?
A: It is engineered for open-pit mining, quarrying, bench drilling and production drilling in soft to medium-hard rock formations such as limestone, sandstone and shale. The robust T45 thread connection accommodates modern high-power hydraulic top hammers, delivering high drilling speed (ROP).
Q2: What is the main advantage of ballistic buttons over dome (spherical) buttons on a T45 89mm bit?
A: Ballistic (parabolic) buttons feature a sharp, pointed shape that penetrates rock through cutting and shearing rather than pure crushing. This provides faster penetration rates, up to 15-30% faster drilling speeds in non-abrasive rock compared with spherical buttons, and lower thrust requirements. In extremely hard, highly abrasive or severely fractured rock, spherical (dome) buttons are preferred to avoid button chipping.
Q3: Why is the dual-size button layout (13mm gauge + 12mm front) used for this 89mm bit?
A: Eight 13mm gauge buttons resist severe perimeter abrasion and preserve the 89mm hole diameter, avoiding premature bit taper, while five 12mm front buttons break down the central rock face efficiently and maintain clear flushing paths to purge rock cuttings.
Q4: How does a flat face profile benefit a T45 89mm bit in production drilling?
A: A flat face profile offers high structural strength and versatile performance across solid rock formations. It distributes high percussive impact evenly across all 13 buttons, preventing localized stress concentrations and ensuring high fatigue resistance during continuous high-speed production drilling.
Q5: How can drill rig operators extend the service life of a T45 89mm ballistic button bit?
A: Use ballistic buttons in non-abrasive soft-to-medium rock to prevent carbide shearing, regrind buttons before flat wear spots become too large to retain their penetration edge, and maintain high flushing air or water pressure to purge cuttings instantly and prevent secondary regrinding.
