Well Drilling 8 3/4" Steel Tooth Hole Opener Drill Bit

Prod Model:	8 3/4"
Markets:	North America,South America,Eastern Europe,Southeast Asia,Africa,Oceania,Mid East,Eastern Asia,Western Europe
Number Of Shaft:	3
Certification:	ISO 9001
Controlling Mode:	Artificial
Structure:	Deep Hole Drilling
Layout:	Vertical
Automatic Grade:	Semiautomatic
Precision:	High Precision
Condition:	New

Product Description

We guaranteed products at a competitive price and high quality. At present, our products have a very good sale in
Domestic and overseas market. We wish to cooperate with you to create a bright future and mutual benefit. Much appreciation for your prompt attention in advance, we are eager to look forward to hearing from you soon.

Rubber sealed sliding bearing bits are sealed by special type "O". Under the normal rotary speed conditions, they can stand high bit pressure. The bore surface of the cone has been treated with special techniaue in order to improve sliding motion of the bearing. And every performance is improved greatly.
1 O-shape seal ring with high saturation butadience acrylonitrile rubber improved the bearing sealed reliability.
2 To adapt high strength and toughness hard alloy teeth, the shock resistance has been increased and the breakage rate has been decreased.
3 The bearing contact surface, neck journal of jaw have been adapted to wear resistance alloy materials, the special craft processing has been applied in the bore surface of the cone which increases the load capability and the working life.
4 Optimized tooth number of cone and height of tungsten carbide tooth which improved the total cutting property and drilling footage.
5 High-performance lubricant grease has been applied in bearing which increased lubricating and protecting.

IADC	WOB(KN/mm)	RPM(r/min)	Applicable Formations
417/427	0.3-0.9	150-70	very Soft formation with low compressive strength and high drillability,such as clay,soft mudstone,shale,salt,loose sands,etc.
437/447	0.35-0.9	150-70	very Soft formation with low compressive strength and high drillability,such as clay,soft mudstone,shale,salt,loose sands,etc.
515/525	0.35-0.9	180-60	very Soft formation with low compressive strength and high drillability,such as mudstone,salt,soft limestone, sands,etc.
517/527	0.35-1.0	140-50	Soft formation with low compressive strength and high drillability,such as  mudstone,salt,soft limestone,sands,etc
535/545	0.35-1.0	150-60	medium soft with harder formation, more abrasive streaks,such as hard shale,mudstone,soft limestone,etc.
537/547	0.4-1.0	120-40	medium soft with harder formation, more abrasive streaks,such as hard shale,mudstone,soft limestone,etc.
617/627	0.45-1.1	90-50	medium hard with higher compressive strength as well as thick and hard streaks,such as hard shale,sands,limestone,dolomite,etc.
637	0.5-1.2	80-40	medium hard with higher compressive strength as well as thick and hard streaks,such as hard shale,sands,limestone,dolomite,etc.
737	0.7-1.2	70-40	Hard with high abrasiveness such as hard limestone,dolomite,firm sands,etc
827/837	0.7-1.2	70-40	very hard with high abrasiveness,such as quartzite,quaruzite sand,chert,basalt,granite,etc.