Self-Drilling Anchor Bolts

Self-Drilling Anchor Bolts
Self-Drilling Anchor Bolts
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Different from ordinary anchor bolts, self-drilling anchor bolts are a main bolting solution for weak rock and unstable environment like the fracture zone and crustal deformation, especially when borehole caving-in occurs or extended anchor bolts are needed.

Maxdrill’s self-drilling anchor bolts with functions of drilling, grouting and anchoring in one have a wide range of applications of tunnel forepoling, radial anchoring and micro-piling. Featuring versatility and extension capacity, Maxdrill’s self-drilling anchor bolts can be applied in railroad construction, tunneling, water engineering, slope stabilization, dam, abutment, riverbank, high-rise building foundation and enhancement. They are particularly suitable for handle subsidence, hole caving-in, fissure, collapse, landslip and other geological disasters while being easy to operate in limited space.

Specifications
  • Bar size: R25, R32, R38, R51, T76
  • Ultimate load: 200-1,900KN
  • Yield load: 150-1,500KN.
  • Length: custom length to suit your needs
  • Productivity: 400mt/month
  • Accessories: sacrificial drill bits, nut, couplings, grout-stop plug, plates
R Type
Bar Size R25N R32L R32N R32S R32SS R38N R52L R51N
Nominal outer diameter(mm) 25 32 32 32 32 38 51 51
Nominal inner diameter(mm) 13 21 20 18 15 24 35 33
Cross section area of bar(mm²) 240.00 310.00 350.00 430.00 480.00 590.00 740.00 940.00
Ultimate load(kN)≥ 200.00 250.00 280.00 360.00 405.00 500.00 550.00 800.00
Yield load(kN)≥ 150.00 190.00 230.00 280.00 300.00 400.00 450.00 630.00
Ultimate strength(N/mm²)≥ 830.00 800.00 800.00 830.00 840.00 840.00 740.00 850.00
Yield strength(N/mm²)≥ 620.00 610.00 650.00 650.00 620.00 670.00 600.00 670.00
Elongation A5(%)≥ ≥6.00
E Modulus (GPa) 178.00 180.00 185.00 205.00 180.00 202.00 182.00 185.00
Nominal weight(kg/m) 1.90 2.40 2.70 3.40 3.80 4.70 5.90 7.40
Thread(left-hand) MAXDRILL Internal standard and based on ISO 10208 and 1720 etc.
Steel grade ASTM A519-035140/EN 10083-141Cr4
Hardness(HB) 230-300
Delivery engths(m) 1M,2M,3M,4m.Other length can be special order
T Type
Bar Size T30N T40L T40N T52N T60N T76L T76N T76S T103N T103S
Nominal outer diameter(mm) 30 40 40 52 60 76 76 76 103 103
Nominal Inner diameter(mm) 13 24 20 30 38 54 49 44 80 57
Cross section area of bar(mm²) 400.00 660.00 770.00 1,150.00 1,300.00 1,650.00 2,080.00 2,460.00 2,950.00 4,800.00
Ultimate load(kN) 320.00 540.00 660.00 929.00 1,000.00 1,200.00 1,600.00 1,900.00 2,300.00 3,700.00
Yield load(kN) 260.00 425.00 525.00 730.00 800.00 1,000.00 1,200.00 1,500.00 1,800.00 2,670.00
Ultimate strength(N/mm²) 800.00 810.00 850.00 800.00 760.00 720.00 760.00 770.00 770.00 770.00
Yield strength(N/mm²) 650.00 640.00 680.00 630.00 610.00 600.00 570.00 600.00 610.00 550.00
Elongation A5(%) ≥6.00
E Modulus (GPa) 195.00 196.00 198.00 190.00 192.00 188.00 208.00 190.00 190.00 190.00
Nominal weight (kg/m) 3.10 5.20 6.00 9.00 10.20 12.90 16.30 19.30 23.00 37.50
Thread(left-hand) MAXDRILL Internal standard and based on ISO 10208 and 1720 etc
Steel grade ASTM A519-035140/EN 10083-141Cr4
Hardness(HB) 240-310
Delivery lengths(m) 1M,2M,3M,4M. Other length can be special order
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