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China factory - Yanggu Henglong Construction Machinery Co., Ltd.

Yanggu Henglong Construction Machinery Co., Ltd.

  • China,Liaocheng ,Hunan
  • Verified Supplier
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  3. 51R28 Threaded Cross Drill Bit With 51mm Diameter R28 Thread And Cross Head
China 51R28 Threaded Cross Drill Bit With 51mm Diameter R28 Thread And Cross Head
China 51R28 Threaded Cross Drill Bit With 51mm Diameter R28 Thread And Cross Head

  1. China 51R28 Threaded Cross Drill Bit With 51mm Diameter R28 Thread And Cross Head
  2. China 51R28 Threaded Cross Drill Bit With 51mm Diameter R28 Thread And Cross Head

51R28 Threaded Cross Drill Bit With 51mm Diameter R28 Thread And Cross Head

  1. MOQ： 10PCS
  2. Price： Please contact us
  3. Get Latest Price
Payment Terms T/T
Compatible drill rods Hex25 R28 and Hex28 R28
Thread type R28
Material tips Ultra hard tungsten carbide
Packaging Details Wooden Boxes, Cardboard Boxes
Thread diameter 28.5 - 29mm
Delivery Time 7-15 Days
Material body High grade alloy steel
Head design Cross (X Shaped)
Diameter 51mm
Tungsten carbide inserts 4
Supply Ability 3000 PCS Per month
Penetration rate 20% higher
Model Number 51R28
Brand Name HLDRILL
Place of Origin CHINA
Certification ISO 9001 Certified

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  1. Product Details
  2. Company Details

Product Specification

Payment Terms T/T Compatible drill rods Hex25 R28 and Hex28 R28
Thread type R28 Material tips Ultra hard tungsten carbide
Packaging Details Wooden Boxes, Cardboard Boxes Thread diameter 28.5 - 29mm
Delivery Time 7-15 Days Material body High grade alloy steel
Head design Cross (X Shaped) Diameter 51mm
Tungsten carbide inserts 4 Supply Ability 3000 PCS Per month
Penetration rate 20% higher Model Number 51R28
Brand Name HLDRILL Place of Origin CHINA
Certification ISO 9001 Certified
51R28 Threaded Cross Drill Bit With 51mm Diameter R28 Thread And Cross Head Design For Hard Rock Drilling
In today's fast paced mining, tunneling, quarrying, and infrastructure construction industries, drilling efficiency, bit durability, and precise hole control are non negotiable for project success. Among all popular rock drilling tools, the Henglong 51R28 threaded cross drill bit stands out as a revolutionary solution — especially for applications requiring a small yet high strength R28 thread paired with a 51mm diameter, perfectly balancing compactness, power, and cost effectiveness.
What Is a 51R28 Threaded Cross Drill Bit?
First, let's break down the specifications that define this high performance tool:
51mm Diameter
The standard outer diameter, ideal for medium to large blast holes, anchor holes, and tunneling holes — perfect for mining, tunnel support, and quarrying operations.
R28 Thread
A small but robust threaded connection (standard outer diameter ~ 28.5 - 29mm), smaller than the common R32 thread but stronger than R25, designed for light to medium hydraulic rock drills and pneumatic drilling rigs. Ensures easy assembly/disassembly, stable connection, and resistance to loosening under heavy impact.
Cross (X - Shaped) Head
Features four premium tungsten carbide inserts arranged in a cross pattern, distinguishing it from button bits and taper bits. This iconic design delivers superior directional stability, minimal hole deviation, and efficient rock breaking — even in fractured, abrasive, or hard rock formations like granite, basalt, and hard limestone.
Crafted from high grade alloy steel body and ultra hard tungsten carbide tips, each 51R28 threaded cross drill bit undergoes strict heat treatment, precision welding, and quality testing to ensure high hardness, excellent wear resistance, and long service life. It is a small thread, heavy duty drilling tool engineered to conquer the toughest rock drilling challenges.
51R28 Threaded Cross Drill Bit technical diagram showing dimensions and features Close-up view of 51R28 cross drill bit showing carbide inserts and threading
Why Choose 51R28 Threaded Cross Drill Bit? Core Advantages for Modern Drilling
In a market flooded with R25, R32, and T38 drill bits, the 51R28 cross bit stands out with 5 unique, industry leading benefits that directly address contractors' biggest points :
1. Small R28 Thread, High Strength Compatibility
Fully compatible with Hex25 R28 and Hex28 R28 drill rods, fitting most popular pneumatic rock drills, light hydraulic drilling rigs, and handheld jackhammers used in mining and tunneling.
2. Cross Head Design: Faster Drilling, Straighter Holes
  • 20% higher penetration rate: Efficiently crushes hard rock and removes drilling debris faster, boosting productivity
  • Minimal hole deviation: Superior directional stability ensures straight, accurate holes — critical for precise blasting and tunnel support
  • Reduced vibration: Balanced cutting action lowers tool vibration, extending drill rod and rig life while improving operator comfort
3. Unmatched Durability for Hard Abrasive Rock
Hard rock (granite, basalt) and abrasive formations are the top causes of premature bit wear and breakage. The 51R28 threaded cross drill bit solves this with:
  • Premium tungsten carbide inserts : Ultra high hardness and wear resistance, lasting 5 - 6 times longer than standard bits
  • Reinforced alloy steel body : Heat treated for maximum toughness, resisting chipping, cracking, and breakage under extreme impact
  • Optimized flushing channels : Clears rock dust and debris efficiently, preventing overheating and carbide damage during continuous drilling
4. Cost Effective Low Maintenance
  • Long service life
  • Affordable pricing
  • Easy maintenance
5. Versatile Applications Across Industries
The 51R28 threaded cross drill bit is not limited to a single industry — it excels in diverse drilling scenarios, making it a multi purpose tool for global contractors.
Applications
The 51R28 cross bit is engineered for medium to heavy drilling tasks in challenging environments. Its top applications include :
  • Underground Mining : Blast hole drilling, roof support anchor holes, and tunnel development in hard rock mines
  • Tunneling Underground Construction : Drilling for rock bolts, grout holes, and blast holes in highway, railway, and water conservancy tunnels
  • Quarrying Stone Mining : Drilling blast holes for granite, marble, and limestone quarrying — ideal for medium hard rock formations
  • Infrastructure Building Construction : Foundation drilling, rock anchor holes, and demolition holes in hard concrete and rock
  • Small to Medium Drilling Projects : Perfect for contractors using light hydraulic or pneumatic rigs, balancing power and portability
If you're looking for a high quality, long lasting 51mm cross drill bit with R28 thread to boost your drilling productivity and reduce costs, our 51R28 Threaded Cross Drill Bit is your ultimate solution.
Contact us today for a free quote, technical support, or bulk order discounts — we're here to support your project success !

Company Details

Bronze Gleitlager

,

Bronze Sleeve Bushings

 and 

Graphite Plugged Bushings

 from Quality China Factory

  • Business Type:

    Manufacturer,Exporter,Trading Company,Seller,Other

  • Year Established:

    2018

  • Total Annual:

    10000000-30000000

  • Employee Number:

    30~50

  • Ecer Certification：

    Verified Supplier

HENGLONG is an internationally recognized and leading producer of superior percussive rock drilling tools.Our high performance products include top hammer drill bits extension and tunneling rods,integral and tapered rods,shank adapters,coupling,drag bits,blast furnace tapping tools,self dr... HENGLONG is an internationally recognized and leading producer of superior percussive rock drilling tools.Our high performance products include top hammer drill bits extension and tunneling rods,integral and tapered rods,shank adapters,coupling,drag bits,blast furnace tapping tools,self dr...

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Get in touch with us

  • Reach Us
  • Yanggu Henglong Construction Machinery Co., Ltd.
  • 4F,6# Building,No.19 Hunan Road,Liaocheng City,Shangdong province,China
  • https://www.drillbuttonbit.com/

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