Descripción
The RockHound T45 Broca de botón de rosca is built for exactly those conditions. The T45 thread is a 45mm-pitch standard widely used on high-power rock drills across open-pit mines, quarries, and underground hard rock operations. Our bits come in three main designs — Standard, Retrac Flat Face, and Retrac Drop Center — covering diameters from 70mm to 102mm (2¾” to 4″). Each one is machined from Acero aleado 45CrNiMoVa y equipado con YK05 tungsten carbide inserts that hold their shape under continuous impact.
Here’s what sets this apart from a generic replacement bit: the body isn’t just hard — it’s tough under cyclic impact loading. RockHound uses a 20-hour controlled heat treatment process (learn more: 20 horas de tratamiento térmico en herramientas de perforación de rocas) that balances surface hardness with core ductility. The result is a bit body that absorbs shock without cracking, even in abrasive granite or fractured formation.
The YK05 carbide grade is purpose-selected for hard and highly abrasive rock. It has high transverse rupture strength, which means the buttons resist chipping on impact. This directly extends regrind intervals and keeps penetration rate consistent longer into the bit’s service life. For full material background, see: Material de la broca para taladro percutor superior: 45CrNiMoV & YK05.
The Retrac skirt design is the right call for any formation where hole wall collapse is a risk — broken rock, fault zones, or ground with clay intrusions. The ribbed skirt profile reams outward on withdrawal, clearing obstructions so the drill string comes out cleanly. Without this, a jammed bit means lost tooling and possible rod breakage.
All T45 bits use a precision-machined internal thread that connects directly to standard T45 MF extension rods and T45 coupling sleeves. Thread fitment is CNC-machined to tight tolerances. That means full impact energy reaches the face — not absorbed in a loose connection.
Material Specifications
| Componente | Material / Standard | Specification / Treatment |
|---|---|---|
| Bit Body | 45CrNiMoVa Alloy Steel | Heat treated, HRC 58–62 |
| Tungsten Carbide Grade | YK05 | Hot-pressed, precision ground |
| Tratamiento de superficies | Manganese phosphate coating | Corrosion & galling resistance |
| Tipo de hilo | T45 (45mm pitch) | CNC precision-machined |
| Heat Treatment Duration | 20 horas | Controlled atmosphere furnace |
Structure Features
- Retrac drill bits focus on efficient chip removal during operation
- In mining operations, retrac drill bits, through their optimized chip removal design
- Retrac bits can effectively reduce the accumulation of waste chips and improve drilling efficiency.
This diagram illustrates the high-performance design of a professional-grade thread button drill bit:
Tungsten Carbide Inserts (Buttons)
- Features: Uses high-purity tungsten carbide as cutting teeth, possessing extremely high hardness and wear resistance.
- Advantages: Maintains a very long service life in hard rock and highly abrasive rock formations, reducing downtime for replacement.
High-Strength Alloy Steel Body
- Features: The drill bit body is made of high-grade alloy steel with precision heat treatment.
- Advantages: Can withstand the high-frequency impact loads generated by the rock drill, has high fatigue strength, and prevents body cracking.
Internal Thread Connection (T-Type)
- Features: The diagram shows a standard T45 internal thread connection.
- Advantages: Provides a tight connection and high energy transfer efficiency, is easy to disassemble, and is compatible with mainstream rock drilling equipment.
Central Flushing Passage
- Features: A vertical fluid channel running through the center of the drill bit.
- Advantages: Provides strong water/air pressure to quickly remove rock cuttings from the cutting face, preventing secondary crushing and improving drilling efficiency.
Side Air/Water Holes
- Features: Auxiliary flushing ports located on the side of the drill bit.
- Advantages: Works in conjunction with the central channel to create a vortex effect, ensuring smooth chip removal even in deep hole drilling, preventing drill bit jamming.
Falda Retrac
- Features: The skirt has a specific ribbed structure.
- Advantages: Easier to retrac the drill bit in loose or fractured rock formations, reducing the risk of drill bit loss and jamming.
For a broader look at how button bits work in practice: Broca de botón Top Hammer: cómo funciona, usos y mantenimiento.
Especificación
T45 Thread Button Bit Technical Specifications
| Tipo de bit | Diámetro (mm) | Diámetro (pulgadas) | Botones del manómetro | Botones centrales | Ángulo del medidor | Hilo | Código del producto | Peso (kg) |
|---|---|---|---|---|---|---|---|---|
| Botón Broca | 76 | 3″ | 7 × Ø12mm | 4 × Ø12mm | 35° | T45 | 173-7611-7705 | 2.4 |
| Botón Broca | 89 | 3½” | 8 × Ø13mm | 6 × Ø13mm | 35° | T45 | 173-8914-7765 | 3.8 |
| Botón Broca | 102 | 4″ | 9 × Ø12mm | 6 × Ø12mm | 35° | T45 | 173-0215-7705 | 6.7 |
| Tipo de bit | Diámetro (mm) | Diámetro (pulgadas) | Botones del manómetro | Botones centrales | Ángulo del medidor | Hilo | Código del producto | Peso (kg) |
|---|---|---|---|---|---|---|---|---|
| Retrac Flat | 76 | 3″ | 8 × Ø12mm | 4 × Ø11mm | 35° | T45 | 174-7612-7705 | 3.2 |
| Retrac Flat | 89 | 3½” | 9 × Ø11mm | 6 × Ø10mm | 35° | T45 | 174-8915-7705 | 4.2 |
| Tipo de bit | Diámetro (mm) | Diámetro (pulgadas) | Botones del manómetro | Botones centrales | Ángulo del medidor | Hilo | Código del producto | Peso (kg) |
|---|---|---|---|---|---|---|---|---|
| Retrac Drop Center | 70 | 2¾” | 6 × Ø11mm | 4 × Ø10mm | 40° | T45 | 176-7010-7704 | 2.2 |
| Retrac Drop Center | 89 | 3½” | 8 × Ø12mm | 6 × Ø11mm | 35° | T45 | 176-8914-7705 | 3.8 |
| Retrac Drop Center | 102 | 4″ | 8 × Ø13mm | 7 × Ø12mm | 35° | T45 | 176-0215-7705 | 5.3 |
| Tipo de bit | Diámetro (mm) | Diámetro (pulgadas) | Insert Config | Hilo | Código del producto | Peso (kg) |
|---|---|---|---|---|---|---|
| X Bit | 89 | 3½” | 16 × Ø10mm (H×T) | T45 | 168-8916-7710 | 5.0 |
Compatible With / Replacement Guide
RockHound T45 Thread Button Bits share the same T45 thread standard and are dimensionally compatible with tooling and drill strings from the following brands. These bits are designed as direct replacements for equivalent OEM products — same thread pitch, same diameter, same connection geometry.
| Marca | Model / Series | Diameter Range | Notas |
|---|---|---|---|
| Epiroc (formerly Atlas Copco Secoroc) | Powerbit T45 (76mm Retrac, 89mm Retrac, 102mm Standard) | 76–102mm | Same T45 thread, compatible connection. RockHound YK05 carbide is equivalent grade to Epiroc’s standard carbide button series. |
| Sandvik Rock Technology | T45 Button Bit 89mm Retrac / T45 89mm DC OP | 76–102mm | Standard T45 thread, dimensionally interchangeable. |
| Robit (Finland) | T45 Series Standard & Retrac | 76–102mm | T45 thread standard. Same flushing hole pattern on comparable diameters. |
| Rockmore International | T45 series button bits | 76–89mm | Compatible thread form. |
Nota: “Compatible” and “replacement” refer to thread geometry and dimensional fit only. RockHound is an independent manufacturer. Epiroc, Sandvik, Robit, and Rockmore are registered trademarks of their respective owners. Always confirm bit diameter and flushing configuration before substituting bits in a drill string.
Aplicaciones
En T45 Thread Button Bit is a heavy-duty rock drilling tool designed for medium to hard rock formations. As a core component of top hammer drilling systems, it is widely utilized in high-impact environments where precision and durability are paramount.
Bench Drilling — Open Pit Mines & Quarries
T45 is the standard thread for production bench drilling in open-pit copper, gold, and iron ore mines, and in aggregate quarries. Hole diameters of 76mm to 102mm match common blast pattern requirements. The standard button bit (flat face, spherical buttons) works well in consistent granite or basalt benches. If the bench has fractured zones, switch to a Retrac variant.
Underground Long-Hole Drilling
For long-hole stoping in underground mines — uphole or downhole — the T45 Retrac Drop Center is the most stable choice. The drop center geometry keeps chip loading manageable in deeper holes, and the Retrac skirt reduces the risk of the bit getting stuck during string extraction.
Tunnel Drifting & Heading
In face drilling for tunnel construction, rock formations often shift from solid to fractured within a single blast round. The T45 Retrac Flat Face is widely used here because it handles both conditions without needing a bit change mid-round. It also maintains hole diameter longer in abrasive tunnel faces.
Foundation Drilling & Infrastructure
T45 bits are used in anchoring, rock bolt installation, and pre-split drilling for slopes and retaining walls. The 76mm standard bit is a common choice for anchor hole work in granite or hard limestone.
Compatible Rock Types The RockHound T45 lineup covers:
- Hard rock: granite, quartzite, basalt (UCS 150–250 MPa)
- Medium-hard rock: limestone, hard sandstone, metamorphic rock (UCS 80–150 MPa)
- Abrasive formations: silica-rich rock where gauge button wear is the main failure mode
For guidance on matching face design and button shape to your specific formation: Los mejores tipos de brocas para taladro percutor: Diseño de la cara y forma de botón.
How to Choose the Right T45 Bit
Choosing the wrong bit doesn’t just hurt performance — it shortens service life and increases cost per meter. Here’s a practical way to narrow it down:
Step 1 — Match Diameter to Your Blast Pattern T45 bits run from 70mm to 102mm. Your blast hole diameter is set by your powder factor and burden/spacing calculations. Most T45 bench work uses 76mm or 89mm. Confirm your required hole size before ordering.
Step 2 — Choose Skirt Design Based on Ground Conditions
- Standard skirt: Solid, competent rock with no collapse risk. Maximum energy transfer, lowest weight.
- Retrac Flat Face: Mixed ground with occasional fractured zones or fault crossings. Good for drifting and tunneling.
- Retrac Drop Center: Deep holes (>15m), loose or collapsing ground, underground stoping. The drop center face keeps the center buttons cutting while outer buttons stay in gauge.
Step 3 — Match Button Profile to Rock Hardness
- Spherical buttons: Hard, abrasive rock above 150 MPa UCS. Buttons stay in gauge longer. Standard on most RockHound T45 SKUs.
- Ballistic buttons: Medium-hard rock, 80–150 MPa. Higher penetration rate in softer formation; wears faster in hard abrasive ground.
Step 4 — Verify Flushing Capacity In deep holes or high-dust environments, check that your compressor delivers enough air volume to clear cuttings from the bit face. The 89mm and 102mm Drop Center models have enlarged skirt grooves for this reason. If cuttings aren’t clearing, secondary wear accelerates fast.
Step 5 — Check Rod Compatibility T45 bits connect to T45 MF extension rods via T45 coupling sleeves. Make sure your drill string uses T45 thread throughout. Mixing T45 and T51 components causes energy loss and early thread wear.
How does RockHound T45 Drill Bit Work
Working Principle
- Medium-hard to hard rock formations: The rock in the video is hard and contains fractured zones.
- Underground mining and tunnel excavation: Used for medium-depth drilling, especially in applications requiring high hole straightness.
- Loose/unstable formations: This is the “core strength” of the easily retrievable drill bit. In conditions where the rock is prone to collapse or the borehole wall is unstable, conventional drill bits are highly susceptible to jamming, while the easily retrievable drill bit can effectively handle these situations.
“Retrac” Retractable Design:
Principle: The drill bit skirt features long longitudinal alloy cutting teeth or stepped edges.
Advantages: When drilling is complete and the drill bit needs to be retracted, if the borehole wall collapses or rock cuttings accumulate, the reverse cutting edges on the skirt can “grind” away the obstacles behind it, ensuring the drill rod is pulled out smoothly.
High-Energy Power Transmission:
Principle: T45 represents a 45mm thread specification. This large thread design can withstand the high-frequency impact waves generated by modern high-power rock drills.
Advantages: As seen in the video, the powerful impact force is efficiently transmitted through the T45 thread to the ball teeth on the drill bit face, causing the rock to break.
Efficient Chip Removal System:
Principle: The video shows high-pressure water/air jets used to flush the bottom of the hole.
Advantages: The retractable drill bit’s skirt has deeper grooves, which, in conjunction with the central chip removal hole, can remove crushed rock more quickly, reducing secondary wear and preventing jamming caused by accumulated debris.
Pautas de mantenimiento
Proper maintenance extends service life and keeps cost-per-meter low. These are the standard practices for T45 button bits in regular use:
Regrinding
Buttons wear into a flat platform over time. Once the flat area reaches 1/3 of the button diameter, penetration rate drops noticeably. Regrind at this point — don’t wait until buttons are nearly gone. Use the correct concave grinding cup matched to your button diameter (Ø10mm, Ø11mm, Ø12mm, or Ø13mm). Keep the grinder concentric to avoid off-axis button profiles.
Regrind Intervals
In hard granite (>200 MPa), expect 300–500 meters per regrind cycle on 89mm bits. In medium-hard limestone, 600–900 meters is common. Track meters per bit and log your first-regrind point — it tells you if the carbide grade is matched to your rock.
Inspección de hilos
After each shift, check the T45 internal thread for signs of galling, wear on the thread flanks, or debris packed into the root. Clean threads with a wire brush and compressed air. Apply thread grease (EP-grade or equivalent) before each connection. A dry T45 thread under repeated impact loosens over time and causes energy loss.
Almacenamiento
Store bits in a dry location, off the floor, in thread protectors or a dedicated bit rack. Don’t stack loose bits — button damage from contact chips costs you meters. If bits are in stock longer than 6 months, inspect the phosphate coating and re-grease threads before use.
Bit Rotation
If you have multiple T45 bits in rotation on a single rig, track hours and meters per individual bit. Bits that are close to end-of-life can still be used in soft or broken ground where new bits aren’t needed.
When to Retire a Bit
Retire a bit when any of the following occur: buttons are missing, cracked, or chipped deeper than 50% of button height; the body shows cracking near the thread shoulder; gauge diameter has worn below the minimum blast hole tolerance; or the thread shows visible plastic deformation.
For a complete maintenance workflow including regrinding technique: Broca de botón Top Hammer: cómo funciona, usos y mantenimiento.
Producción conexa
All product specifications, weights, and product codes are accurate at time of publication. RockHound reserves the right to update specifications without prior notice. For current pricing and availability, contact our sales team directly.
PREGUNTAS FRECUENTES
A T45 Thread Button Bit is used in top hammer drill rigs for production drilling in open-pit mines, quarries, underground long-hole stoping, and tunnel face drilling. The T45 refers to the 45mm thread pitch on the connection end. Typical hole diameters are 76mm to 102mm. It works in hard to medium-hard rock formations including granite, basalt, limestone, and quartzite.
RockHound offer a comprehensive range of diameters to suit various blasting requirements, including:
76mm (3") - Standard for smaller hole blasting.
89mm (3 1/2") - The most popular size for general production drilling.
102mm (4") - Ideal for large-scale quarrying and mining projects.
Standard T45 Bits: Feature a compact body design, best suited for stable and homogeneous rock formations where the risk of hole collapse is low.
T45 Retrac Bits: Specifically designed for fractured or broken rock. The "Retrac" (retractable) skirt features cutting edges or grooves that help the bit drill its way out of a hole if the rock collapses behind it, significantly reducing the risk of stuck drill strings.
Drop Center (DC): Features a recessed center. It is excellent for maintaining rectitud del agujero and is preferred for fast drilling in soft to medium-hard rock.
Flat Face (FF): This design provides a stronger bit body and is more durable in extremely hard or abrasive rock conditions.
The configuration of Tungsten Carbide inserts is critical for efficiency. For example:
RockHound T45-102mm Standard Bit uses a 9 x 12mm Gauge + 6 x 12mm Centre layout. The higher number of gauge buttons ensures better diameter retention and wear resistance in abrasive ground.
En T45 Insert X Bit (89mm) utilizes cross-type inserts for specific impact requirements where button bits might suffer from premature insert failure.
Yes. RockHound T45 Thread Button Bits use the standard T45 thread geometry and are dimensionally compatible with T45 extension rods and coupling sleeves from Epiroc, Sandvik, Robit, and other brands using the T45 standard. They are direct replacement options for equivalent OEM sizes. Always confirm bit diameter and flushing hole count match your specific drill string configuration.