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Bestlink Down The Hole Rock Drilling Tools Reamer Bits Deep Water Well Drilling DTH Hammer Hole Opener Button Drill Bits

Bestlink Down The Hole Rock Drilling Tools Reamer Bits Deep Water Well Drilling DTH Hammer Hole Opener Button Drill Bits
​Hole openers are specialized drill bits that can be used to widen pre-existing size bore holes. At some work condition it may be necessary to increase the size of a pre-drilled hole to a larger diameter or to drill large diameter holes.
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  • DTH hole opener bits

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Bestlink Down The Hole Rock Drilling Tools Reamer Bits Deep Water Well Drilling DTH Hammer Hole Opener Button Drill Bits


Hole openers are specialized drill bits that can be used to widen pre-existing size bore holes. At some work condition it may be necessary to increase the size of a pre-drilled hole to a larger diameter or to drill large diameter holes. Hole opener bits are designed specifically for this purpose, which is an effective way of enlarging holes, hence the bits named as "Hole Opener". A common practice involves drilling a relatively small pilot hole at first stage, and second and final stage then further widening it with a hole opener bits, since this can result in a straighter hole and require less powerful machinery. And different stages can be set per drilling specifications to maximize cutting breaking and removal, and rig capabilities. Besides, rotation torque, the DTH hole opener involves a concussive force that repeatedly impact a drilling head into the rock or other substrate. The impacting action can pulverize rock and also force it back and up, helping to clear out the borehole. So, in addition to widening a bore hole, a hole opener can also clean excess material out of it.

The drilling of large boreholes is required in a number of different industries, such as hydrocarbon exploration, well drilling, and horizontal excavation for tunnels and other purposes and so on. Drilling one large hole could require an exceptional amount of power and very large machinery, so the process is sometimes done in several steps. In some cases, a relatively small size bit will be used to drill a pilot hole. This kind of drilling practice typically requires less energy than doing it in one step and can also result in a straighter borehole. After this initial pilot hole has been drilled, a hole opener can be used to widen the borehole. In such case, the result can be a more precise borehole that was created with less powerful equipment than would have been needed to drill a large hole at beginning directly.

Specifications:

Down The Hole Drilling DTH Hole Opener Button Bit D(mm) D1(mm) Gauge Front Shank
165 82 14 14 DHD340
   SD4
   QL40
178 99 16 14
190 115 16 14 DHD350
   QL50
216 138 16 14
254 159 16 14 DHD360
   SD6
   QL60
305 208 16 16
381 296 16 16
305 208 16 16 DHD380
   QL80
381 296 16 16
445 305 18 16 SD10
   NUMA100
482 311 18 16
660 445 19 18 SD12
   NUMA120


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Bestlink Factory

Xiamen Bestlink Factory Co., Ltd  is  committed  to  provide  the  best  drilling  and  cutting machine,  tools and accessories products in marble and granite stone quarrying,  as well as in civil engineering application, especial demolition project. it is now a leading manufacturer of cutting and drilling equipment for the extraction of marble, granite  and ornamental stones in china.  

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