R Thread Bars – R25
R25 R32 R38 R51 T30 T40 T76

Self-drilling anchor (SDA) combines drilling, insertion and grouting into one easy operation. It reduces project lead time and installation difficulty. Mayland Metallic Materials Ltd. utilizes low carbon steel in all of its anchor production. Low carbon content in steel increases its ductility, reduces its brittleness, and resists corrosion cracking and carbon embrittlement. This choice of material significantly reduces occurrences where rockbolt may snap or buckle during onsite installation.

Anchor Body Drill Bit Hex Nut Arch Plate Coupler

Test Report Link Goes Here

Anchor Body

Rock Bolt Type Outer Diameter Inner Diameter Weight Cross Section Area Yield Load Ultimate Tensile Load
R25N 25 mm 14 mm 2.3 kg/m 288 mm2 150 kN 200 kN

Hex Nut

Hex Nut Type Width Across Flats Length Thread Direction Weight
R25 41 mm 35 mm L 0.25 kg/pc

Drill Bit

EW Clay
DrillBit Size Drill Bit Type Condition Outer Diameter Weight Thread Direction
R25 EX – Steel Cross Bit Mixed Soils – Soft to Medium Conditions 42 mm 0.30 kg/pc Left
R25 EXX – Tungsten Carbide Cross Bit Mixed Soils – Soft to Medium Conditions 42 mm 0.30 kg/pc Left
R25 ESSF – Tungsten Carbide Button Bit Medium Soil Condition 42 mm
51 mm
0.30 kg/pc
0.42 kg/pc


Coupler Type Outer Diameter Length Thread Direction Weight
R25 36 mm 150 mm Left 0.70 kg/pc

Arch Plate

Arch Plate Type Width Length Thickness Hole Diameter Weight
R25 150 mm 150 mm 8 mm 30 mm 1.40 kg/pc
R25 200 mm 200 mm 10 mm 30 mm 3.00 kg/pc