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{"title":"High Strength Steel Self Drilling Anchor Nut With Excellent Structural Stability","imgUrl":"https:\/\/img.chinax.com\/nimg\/5c\/45\/8d68ccd847bc1fa9fb31be1332fb-200x200-1\/high_strength_steel_self_drilling_anchor_nut_with_excellent_structural_stability.jpg","attrs":{"Brand Name":"HLDRILL","Place of Origin":"CHINA","Minimum Order Quantity":"10PCS","Price":"Please contact us"}}
{"title":"Self Drilling Anchor Bolt Anchor Plate With Integrated Drilling Anchoring","imgUrl":"https:\/\/img.chinax.com\/nimg\/ca\/fb\/6dd3d9e4995d1e52e1f43c9e2306-200x200-1\/self_drilling_anchor_bolt_anchor_plate_with_integrated_drilling_anchoring.jpg","attrs":{"Delivery Time":"7 - 15days","Product Type":"Anchor Plate for Self Drilling Anchoring Systems","Product Name":"Self Drilling Anchor Bolt Anchor Plate","Performance Characteristics":"High construction efficiency , stable stress , and good fit to surrounding rock"}}
{"title":"Self Drilling Anchor Centralizer Anti Corrosion With Hot Dip Galvanized","imgUrl":"https:\/\/img.chinax.com\/nimg\/fb\/8d\/da41ae6c2333b3c6ea2cf546aab5-200x200-1\/self_drilling_anchor_centralizer_anti_corrosion_with_hot_dip_galvanized.jpg","attrs":{"Brand Name":"HLDRILL","Place of Origin":"CHINA","Minimum Order Quantity":"10PCS","Price":"Please contact us"}}
{"title":"High Alloy Seamless Steel Pipe Self Drilling Hollow Anchor Bolts High Strength","imgUrl":"https:\/\/img.chinax.com\/nimg\/ca\/df\/a7664a75abde472501cabb89055e-200x200-1\/high_alloy_seamless_steel_pipe_self_drilling_hollow_anchor_bolts_high_strength.jpg","attrs":{"Brand Name":"HLDRILL","Place of Origin":"CHINA","Minimum Order Quantity":"10PCS","Price":"Please contact us"}}
R thread ( R25 , R32 , R38 , R51 ) and T thread ( T30 , T40 , T52 , T76 , T103 , T127 , T150 )
Packaging Details
Wooden Boxes , Cardboard Boxes
Grouting method
High pressure grout injection
Service life
Long service life with low maintenance
Delivery Time
7-15 Days
Weight
Light weight single unit
Supply Ability
3000 PCS Per month
Installation flexibility
Arbitrarily cut on site , coupled to extend depth
Payment Terms
T/T
Construction speed
40% - 60% faster than traditional rock bolts
Surface treatment
Hot dip galvanized anti corrosion coating
Drill bit type
Tungsten carbide cross bits and button bits
Certification
ISO 9001 Certified
Brand Name
HLDRILL
Place of Origin
CHINA
Self Drilling Anchor Rock Bolt With Integrated Drilling Grouting Anchoring Full Matching Accessories And Customized Sizes For Ground Stabilization
Premium self drilling anchor rock bolt integrating drilling, grouting, and anchoring for fractured rock, loose soil, and collapsing borehole conditions. Features R / T thread hollow anchor bar, full matching accessories, and customizable sizes for underground mining, highway tunnels, wind power slopes, and micropile foundation projects worldwide.
Traditional solid rock bolts face critical construction bottlenecks in broken strata : borehole collapse after drilling, separate three step workflow (drilling grouting anchoring) , insufficient grouting compactness, and low overall anchorage force — leading to frequent construction delays and safety risks.
Core Working Principle
Unlike split type rock bolts requiring pre drilled holes, self drilling anchor rock bolts use hollow fully threaded steel bars as both drill rods and permanent anchor bodies:
Install sacrificial alloy drill bit at the front end ; connect drill rig to drive the system through rock, soil, pebble, or weathered strata
No need to pull out the bar after reaching design depth ; high pressure grout injected through hollow inner channel fills rock fractures and voids
Full external thread maximizes bonding contact area with cement grout , forming seamless reinforcement between anchor bolt and rock mass
Matching bearing plate and lock nut transfer surrounding rock pressure evenly , enabling continuous ground stabilization
This one piece design eliminates borehole collapse risk in fractured zones , soft clay , and mixed fill layers — solving major challenges for global tunnel and mining teams.
Complete System Components Specifications
Standard self drilling anchor rock bolt assembly includes six matched supporting parts, customizable to regional engineering standards ( EU EN, ISO, Australia AS, North America ACI ) :
Component
Specifications
Hollow Threaded Anchor Bar
R thread (R25, R32, R38, R51) and T thread (T30, T40, T52, T76, T103, T127, T150); high tensile alloy steel with quenching heat treatment ; optional hot dip galvanized anti corrosion coating
Sacrificial Drill Bit
Tungsten carbide drill bits (cross bits and button bits) for hard rock and soft soil formations
Coupler Sleeve
Threaded connector for extending anchor bar length in deep micropile, foundation, and tunnel applications
Bearing Plate
Domed / flat high strength steel plate to disperse surface pressure and prevent nut sinking
Lock Nut
Matching thread nut for fast tightening and instant primary support
Centralizer
Auxiliary accessory to maintain anchor bar centering for uniform grout wrapping
All sizes support OEM length cutting, surface anti rust customization, and mixed bulk shipment for global engineering tenders.
Competitive Advantages
Ultra High Construction Efficiency
Eliminates separate drilling machine withdrawal, grouting pipe placement, and casing protection steps. Field tests show 40 - 60% faster single hole construction speed compared to traditional rock bolts, reducing labor and machinery costs.
Full Geological Adaptability
Ideal for tough ground conditions: fractured fault zones, weathered rock, silt soft soil, pebble conglomerate, loose fill slopes, and karst broken rock mass. Widely used in tunnel portal excavation, coal mine roof reinforcement, and slope anti-sliding projects.
Full Length Pressure Grouting
Grout extrudes from borehole bottom upward under pressure, fully filling rock cracks without air voids. Continuous external thread creates strong mechanical occlusion, significantly improving ultimate pull out force.
Flexible Installation
Anchor bars can be cut on site and coupled to extend depth freely. Lightweight design fits narrow underground mine laneways, small municipal foundation pits, and mountain landslide emergency sites.
Low Maintenance Long Service Life
Anti corrosion surface treatments resist groundwater, acid rock leachate, and coastal salt fog. Integrated anchoring structure prevents loose deformation under rock creep pressure, reducing inspection and maintenance frequency.
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...
