Hunan Tianying Drilling Machine Manufacturing Co.,Ltd.  

12 1/4Inch IADC637 Tricone Drill Bit and Three Cone Head with journal bearing on gage protection 

Types which are not shown in the table can be designed and manufactured according to customer's requirements. 

IADC	Weight on Bit per Inch of Bit Diameter(lb/In)	Rotary Speed (r/min)	Cutting Structure	Applications
412/415	1000-2000	90-120	Conical on gage and inner rows	Designed for very soft formations with low compressive strength and high friablity such as shale, soft limestone, sandstone, gravel clay, soft dolimite, coal.
432/435	1000-4000	90-120	Conical/Chisel on gage, Conical inner rows	Designed for very soft formations with low compressive strength and high friablity such as shale, soft limestone, sandstone, gravel clay, soft dolimite, coal.
532/535	2000-5000	80-110	Conical/Chisel on gage, Conical inner rows	Designed for soft formations with low compressive strength and high friablity such as shale, soft limestone, sandstone, interbedded dolomite.
612/615	3000-5000	60-100	Conical/Spherical on gage, Conical inner rows	Designed for high compressive strength, medium hard and abrasive formations, such as limestone, sandstone, interbedded dolomite.
632/635	3000-6000	60-100	Conical/Spherical on gage, Conical inner rows	Designed for high compressive strength, mudium hard and abrasive formations, such as limestone, sandstone, interbedded, dolomite.
732/735	4000-7000	60-90	Spherical on gage, Conical/Double spherical on inner rows	Designed for high compressive strength, hard and abrasive formations, such as granite, limestone, sandstone, dolomite.
832/835	5000-8000	50-80	Spherical on gage, Double spherical on inner rows	Designed for high compressive strength, hard and abrasive formations, such as magnetite quartzite, quartzite, granite.

 

Our drill bits are widely used in mining, oil, gas, water well drilling, HDD, quarrying and construction.

 

All of our bits are manufactured according to strict standards, set forth by the American Petroleum Institute (API). And classified according to characteristics set forth by the International Association of Drilling Contractors (IADC).

Hunan TianYing Drilling Machine Manufacturing Co., Ltd. is a professional manufactory of Rock Drilling Bits. Our drilling bits manufacture are based on the extensive research and development in the field of mining. All the Rock Drilling Bits using the finest raw materials available, including Premium Steel and Tungsten Carbide. We ensure that our worldwide clients have quick access to our service, manufacturing and marketing expertise. Our vision is to become the industry's performance leader in tools that withstand the toughest rock drilling demands. That's why our products exceed industry specifications for performance and safety. When you work with TianYing, we are committed to your productivity and efficiency.