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Luoyang Gongyan Technology Co., Ltd.

China Manufacturer with main products: rock bolts, geo-material

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hollow grouting self drilling anchor bolt

FOB Price: 3.00 - 20.00 USD/Meter
Supply Ability: 3,000,000 Meter per Month
Shipping: FOB Qingdao
Payment Terms: L/C, T/T
In Stock

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Export Markets: North America, South America, Eastern Europe, Southeast Asia, Africa, Oceania, Mid East, Eastern Asia, Western Europe
Place of Origin: Henan in China
Packaging Details: bundles, appropriate for exporting

Quick Details

  • Brand Name: GY
  • Model Number: R25N
  • Material: Steel, 40Cr
  • Process: Hot Rolling
  • Diameter: 25mm
  • Ultimate Load: 200KN
  • Yield Point: 150KN


Self drilling anchor bolt, is a bolting solution for unstable ground conditions such as sand, gravel, silt, and clays, and in soft to medium fractured rock formations.

self drilling anchor bolt consists of anchor nut, anchor plate, anchor coupler, hollow anchor bar, sacrificial drill bit.

Self drilling anchors are successfully used for anchoring in poor ground, cohesive and non-cohesive soils, and in case of unstable boreholes. Main applications are:

Road / rail construction and maintenance

Tunneling & Mining

    1, rock bolting 2, face anchoring 3, forepiling 4, foot piles 5, tunnel portals, treanches, and cut and cover areals

Rural environments

Private residences

Special foundations

Avalanche protection structures

System description

1, hollow core with continuous hot-rolled outside thread

2, application as injection anchor without casing, especially for non-stable boreholes

3, self-drilling installation, utilization of the anchor bar as drill rod with a single-use drill bit

4, easy extension of the anchor bars by anchor coupler

5, grouting or development of the grout body either simultaneously with drilling using a rotary injection adapter or afterwards

6, assembly of the anchor head with the anchor plate and the nut, stressing and locking

Prime advantage of the self-drilling anchor

1, easy and similar operation principle for different rock mass and soil conditions

2, drilling, anchoring and grouting can be performed in one single operation

3, no predrilling of a borehole by using a casing tube and extension rods with subsequent anchor installation necessary

4, minor space requirement for the accomplishment of anchoring

5, optimized machinery and manpower requirements

6, basic dimensioning of the required anchoring forces by choosing the appropriate anchor type

7, optimum bonding of the profiled anchor rod and the grout

8, adjustment of the drill bit design and diameter to different rock mass and ground conditions

9, simple anti-corrosion method available

10, appropriate for temporary or permanent applications


 type  outer diameter inner diameter  ultimate load  yield point  weight thread type 
   mm  mm KN  KN  Kg/m   
R25N 25  13  200  150  2.4   ISO10208
R32L  32  20  220  160  2.9  ISO10208
R32N   32    18.5   280  230  3.2  ISO10208
R32S  32  15  360 280   4.0  ISO10208
R38N  38  19 500  400  5.8  ISO10208 
R51L 51  36  550  450  6.8  ISO10208 
R51N  51  33  800  630  7.8  ISO10208
T76N 76   51  1600  1200  15.6  ISO1720
T76S  76  51  1900  1600  20  ISO1720
T30/11  30  11  320 260   3.2  ISO1720

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