Drilling Accessories


DTH Drilliong Tools

DTH drilling tool is a kind of drilling system which uses compressed air as motivation, makes drilling impact motivation parts down the hole, to control the piston reciprocating motion by the distribution device in the hammer, and then impacts the DTH bit in the front of the hammer to transit the impacting power to the bit. The DTH bit in the front of the hammer breaks the rock to drill hole.

At present, DTH drilling tool is widely used in underground mining, quarries, hydraulic and Hydro-Power Engineering, water well drilling, Mineral exploration, anchoring hole drilling, geothermal engineering, Subway excavation, another civil engineering. It has the advantage of high flatness, smooth hole wall, high rigidity of drill rod and hammer, independent of high axial thrust, no limit of drilling depth, low cost of devices and are easy to maintain. At the drilling hole of diameter 105mm-254mm, plenty of the DTH drilling tools are used.

DTH BITS
  • All the equipment is manufactured using high quality CNC machines.
  • AITC always sources High Quality suppliers from around the globe.

Hammer inch Bits diameter Hammer inch
height weight
1" 64mm-70mm 2 1/2"-2 3/4" BR1
2" 70mm-95mm 2 3/4"-3 3/4" MACH20/BR2
3" 90mm-102mm 3 1/2"-4" COP32/COP34/MACH303
M30/DHD3.5/BR3
4" 105mm-152mm 4 1/8"-6" COP44/DHD340/MACH44
SD4/M40/QL40
5" 133mm-165mm 5 1/4"-6 1/2" COP54/DHD350R/MACH50
SD5/M50/QL50/BR5
6" 152mm-254mm 4 1/8"-10" COP64/DHD360/SD6
M60/QL60/Bulroc BR6
8" 203mm-330mm 8"-13" COP84/DHD380/SD8
QL80/M80
10" 254mm-380mm 10"-15" SD10
NUMA100
12" 305mm-508mm 12"-20" DHD1120/SD12
NUMA120/NUMA125


DTH HAMMERS

The Hammers that AITC provide have the following Features


  • Valve less air distribution.
  • Very reliable, simple piston design.
  • Highly efficient energy transfer
  • Fast drilling speed with lower air consumption and lower oil consumption.
  • Fewer internal parts and simple structure.
  • Very rare chance of failure and easier to maintain because all the parts are heat treated.
  • Easy to disassemble because of the top sub, the drive chuck and the external cylinder are connected by multi-step thread.

Hammers Bit Shank Connection Thread Suitable bit Working pressure Air consumption
2" BR2 RD50 box ￠70-￠90mm 0.7-1.75Mpa 0.7Mpa 4.5m3/min
1.0Mpa 4m3/min
1.4Mpa 5m3/min
3" DHD3.5 COP32/COP34 M30 API 2 3/8"Reg ￠90-￠110mm 1.0-1.5Mpa 1.0Mpa 4.5m3/min
1.5Mpa 9m3/min
4" DHD350, COP54, QL50, SD5, M50 API 2 3/8"Reg/API 3 1/2"Reg ￠135-￠155mm 1.0-2.5Mpa 1.0Mpa 9m3/min
1.8Mpa 15m3/min
2.4Mpa 23m3/min
5" DHD340, COP44, QL40, SD4,M40 API 2 3/8"Reg ￠110-￠135mm 1.0-2.5Mpa 1.0Mpa 6m3/min
1.8Mpa 10m3/min
2.4Mpa 15m3/min
6" DHD360, COP64, QL60, SD6, M60 API 3 1/2"Reg ￠155-￠190mm 1.0-2.5Mpa 1.0Mpa 10m3/min
1.8Mpa 20m3/min
2.4Mpa 28.5m3/min
8" DHD380, COP84, QL80, SD8 API 4 1/2"Reg ￠195-￠254mm 1.0-2.5Mpa 1.0Mpa 15m3/min
1.8Mpa 26m3/min
2.4Mpa 34m3/min
10" SD10, Numa100 API 6 5/8"Reg ￠254-￠311mm 1.0-2.5Mpa 1.0Mpa 22m3/min
1.8Mpa 40m3/min
2.4Mpa 55m3/min
12" DHD1120, SD12, Numa120 API 6 5/8"Reg ￠305-￠445mm 1.0-2.5Mpa 1.0Mpa 30m3/min
1.8Mpa 56m3/min
2.4Mpa 78m3/min




DTH Drill Pipes & Adaptors

AITC always sources high quality DTH Drill pipes and adaptors that are carefully selected seamless steel pipe and high quality alloy steel for joint tools and are precisely friction welded to ensure straightness and concentricity. These have multiple precisely heat-treated tool joints. Internally and externally upset drill rods are available.

Outer diameter Thread Wall thickness Length
MM INCH MM MM
76 3 API 2 3/8 REG,
PI 2 7/8 REG,
API 3 1/2 REG,
API 4 1/2 REG ,
API 2 3/8 IF,
API 2 7/8" IF,
API 3 1/2" IF,
API 4 1/2" IF,
API 5 1/2" IF,
BECO 3 1/2", 		6.3
8.0		 1000-4000mm,
4000-6000mm
89 3 1/2 6.3
8.8		 1000-4000mm,
4000-6000mm
102 4 6.3
8.8		 1500-4000mm,
4000-6000mm
114 4 1/2 7.5
8.0
10.0		 1500-4500mm,
4500-9000mm
127 5 8.0
10.0
12.0		 1500-4500mm,
4500-9000mm
133 5 1/4 8.0
10.0
12.0		 1000-4000mm,
4000-12000mm
140 5 1/2 14.0
19.0		 3000-9000mm,
9000-12000mm



Overburden Drilling System

AITC's solution for Eccentric Overburden Drilling System is as follows:

AITC always sources high quality DTH Drill pipes and adaptors that are carefully selected seamless steel pipe and high quality alloy steel for joint tools and are precisely friction welded to ensure straightness and concentricity. These have multiple precisely heat-treated tool joints. Internally and externally upset drill rods are available.

1.Eccentric Overburden Drilling System
AITC's solution for Eccentric Overburden Drilling System is as follows
  • Rapid removal of cuttings; High penetration rate, especially in resistant rock formation.
  • Easy soil and groundwater sampling during drilling.
  • Possible to measure yield estimate at selected depth in the formation.
  • Advantageous in unconsolidated formations with a high risk of caving .

Eccentric Overburden Drilling System Consist of Guide device, Casing shoe, Reamer, Pilot bit, Guide sleeve and Locking kits.


Model Casing sizes Min. inner dia. of casing shoe Reaming Dia. Hammer shank Drill pipe
Max. OD Min. ID Thread O.D Wrench Flat
ODEX90 115 102 90 123 DHD3.5/COP32/QL30 API 2 3/8" REG 76 65
ODEX115 142 128 115 152 DHD340/COP44/SD4/QL40/M40 API 2 3/8" REG 76 65
ODEX140 171 157 140 187 DHD350R/COP54/SD5/QL50/M50 API 2 3/8" REG 89 65
ODEX165 196 183 165 211 DHD360/COP64/SD6/QL60/M60 API 2 3/8" REG 114 95
ODEX190 222 205 190 237 DHD360/COP64/SD6/QL60/M60 API 3 1/2" REG 114 95
ODEX240 273 261 240 308 DHD380/COP84/SD8/QL80/M80 API 3 1/2" REG 114 95
ODEX280 324 305 280 378 DHD1120/SD10/NUMA100 API 4 1/2" REG 114 95


2.Symmetric Casing Drilling System

Symmetric Drilling System is designed to drill and case a hole simultaneously through unstable ground conditions. The driver bit incorporated with a sacrificial ring or reusable ring makes a full face head design which significantly improves the penetration rate and hole straightness of drilling. The internal flushing grooves together with the built-in casing shoes gives a good seal to the bottom of the drilling hole, and thus minimizing the disruption of the surrounding of the drill hole. Following mentioned are a few features:

  • Straight Holes and Fast Penetration Rate.
  • Less Torque in all ground conditions.
  • Easy System to lock and Unlock Ring.
  • Drilling at any angle required.

Symmetric Casing Drilling System consists of three parts: Polit bit, Casing shoe and Ring bit.


Casing Tube OD(mm Casing Tube ID(mm) Reamed Dia(mm) Casing Shoe ID(mm) Polit bit Dia(mm) Hammer Type
108 93-99 118 86 77 DHD3.5/QL30
114 102-104 127 91 82 DHD3.5/QL30
127 115-117 136 101 92 DHD3.5/QL30
140 124-128 152 117 105 DHD340/SD4/QL40/M40
146 130-134 154 117 105 DHD340/SD4/QL40/M40
168 148-156 185 140 125 DHD350/SD5/QL50/M50
178 158-166 195 150 140 DHD350/SD5/QL50/M50
183 163-171 193 154 144 DHD350/SD5/QL50/M50
194 174-182 211 166 150 DHD360/SD6/QL60/M60
219 199-207 237 193 165 DHD360/SD6/QL60/M60
245 224-233 260 210 190 DHD380/SD8/QL80/M80
273 253-257 308 241 220 DHD380/SD8/QL80/M80
325 305-309 348 281 205 SD10/NUMA100
406 382-388 440 364 340 SD10/NUMA100


3.Concentric casing system with block

Concentric casing system with block is a revolutionary new bit design with wings that extend out larger in diameter than the casing while in the drilling position. The face design of the Bit keeps it almost identical with a conventional bit face, allowing for unmatched penetration rates and smooth operation while drilling through overburden, boulders, or bedrock. When drilling is completed, the bit is simply lifted off bottom, causing the wings to retract back into the guide body. This allows all tooling to be extracted while leaving the casing in place. There is no forward or reverse rotation required, nor any expensive rings left in the hole.

Concentric casing system with block consists of three parts: Guide Device and Block


Casing Tube OD(mm Casing Tube ID(mm) Reamed Dia(mm) Casing Shoe ID(mm) Hammer Type
186 149-155 184 140 DHD350/SD5/QL50/MISSION50
178 159-165 194 150 DHD350/SD5/QL50/MISSION50
193 173-180 206 164 DHD360/SD6/QL60/MISSION60
219 199-206 234 182 DHD360/SD6/QL60/MISSION50
244 224-260 260 210 DHD380/SD8/QL80/MISSION80
273 251-257 305 240 DHD380/SD8/QL80/MISSION80
323 301-310 348 284 SD10/NUMA100
406 382-388 440 364 SD10/NUMA100
457 433-439 488 413 SD12/NUMA120/DHD1120
508 484-490 538 464 SD12/NUMA120/DHD1120