WUHAN KINGDRILLING DIAMOND CO., LTD.

Permanent ring bit System casing drilling bits by DTH Hammer Product details: Kingdrilling Tools CO., LTD is one of the most professional private enterprise specialized in researching and producing casing drilling system,Website:http://www.mingdthbit.com, down the hole(DTH) hammer,?down the hole bit, thread drill bits,?taper drill bits, Anchor, coal mining tools and so on. Product feature: Permanent ring bit system is a concentric drilling system with retrievable pilot bits. This system drills in any direction and in any type of ground condition. The Symmetric components are made up of: ---A pilot bits with large internal flushing holes and external flushing grooves ---Symmetrical ring bit (reamer) with internal bayonet coupling ---Casing shoe for driving of casing. The Pilot bits is attached to any common DTH hammer shank. Model External Dia.(mm) Casing Dia.(OD*ID) Spline MK-MRING90 125 114*102 MACH33, DHD3.5 MK-MRING115 155 139*127 DHD340, SD4, QL4 MK-MRING140 188 168*153 DHD350, SD5, QL5 MK-MRING165 215 194*181 DHD360, SD6, QL6 MK-MRING190 238 219*206 DHD360, SD6, QL6 MK-MRING215 276 254*240 DHD380, SD8, QL8 MK-MRING235 293 273*254 DHD380, SD8, QL8 MK-MRING240 293 273*260 DHD380, SD8, QL8 MK-MRING280 345 323*303 SD10 MK-MRING315 375 355*335 SD10 MK-MRING365 432 406*387 N120, N125, SD12 MK-MRING460 530 508*483 N125, N180 MK-MRING510 580 559*533 N180 MK-MRING560 635 610*584 N180 MK-MRING610 695 660*632 N240 MK-MRING660 735 711*685 N240 MK-MRING710 785 762*736 N240 MK-MRING745 838 813*780 N240 MK-MRING810 886 864*838 N240, N240S MK-MRING860 935 914*884 N240S MK-MRING910 980 965*935 N240S MK-MRING960 1038 1016*986 N240S, M330 MK-MRING1010 1090 1067*1041 M330 How to order: Casing Tube OD & ID + Ring Bit Diameter + Hammer Shank + Maximal Normal Bit Diameter + Casings and Casing Shoes Installation Method (if by threads, threads standard must be offered) ? Advantages? 1. Enhance penetration and perpendicularity 2. Reduce torque requirements 3. Deal with straight, oblique hole and other angle holes 4. Lowest effect with environment 5. Material:? TIMKIN Steel. Tungsten carbide: YK05, T6 from Element Six in Germany 6. Kingdrilling DTH tools are forged by advanced electron-hydraulic forging hammer, and harness process is managed by multipurpose furnace heat treatment. 7. Quality: More than 40 Years engineer to make sure the quality, 100% inspection

•