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51R28 Threaded Cross Drill Bit With 51mm Diameter R28 Thread And Cross Head Design For Hard Rock Drilling

Name: 51R28 Threaded Cross Drill Bit With 51mm Diameter R28 Thread And Cross Head Design For Hard Rock Drilling
Brand: Yanggu Henglong Construction Machinery Co., Ltd.
SKU: 51R28
Availability: InStock

Brand Name:	HLDRILL
Model Number:	51R28
MOQ:	10PCS
Price:	Please contact us
Payment Terms:	T/T
Supply Ability:	3000 PCS Per month

Detail Information

Product Description

Detail Information

Place of Origin:

CHINA

Certification:

ISO 9001 Certified

Diameter:

51mm

Thread Type:

R28

Thread Diameter:

28.5 - 29mm

Head Design:

Cross (X Shaped)

Tungsten Carbide Inserts:

Material Body:

High Grade Alloy Steel

Material Tips:

Ultra Hard Tungsten Carbide

Compatible Drill Rods:

Hex25 R28 And Hex28 R28

Penetration Rate:

20% Higher

Packaging Details:

Wooden Boxes, Cardboard Boxes

Product Description

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.

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 !

Tags:

Button Bit

Drill Rod

Shank Adapters

Coupling Sleeve

Chisel Bit

Cross Bit

Integral Drill Steels

Reaming Bit

TMT Drill Bits

Split Wedge

Coal Bit

Handheld Jack Hammer

Rock Bolt

DTH Hammer Tools

Rock Drill Hose

Hole Savers

Hardware Accessories

Button Bit

Drill Rod

Shank Adapters

Coupling Sleeve

Chisel Bit

Cross Bit

Integral Drill Steels

Reaming Bit

TMT Drill Bits

Split Wedge

Coal Bit

Handheld Jack Hammer

Rock Bolt

DTH Hammer Tools

Rock Drill Hose

Hole Savers

Hardware Accessories

51R28 Threaded Cross Drill Bit With 51mm Diameter R28 Thread And Cross Head Design For Hard Rock Drilling

51R28 Threaded Cross Drill Bit With 51mm Diameter R28 Thread And Cross Head Design For Hard Rock Drilling