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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 | | | | | | | | |
| 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 | |||||||
| Bar Size | | | | | | | | | | |
| 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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