Cutting Structure The wear-resistance of teeth is enhanced with premium tungsten carbide hardfacing on the tooth surfaces for steel tooth bit.The durability of premium tungsten carbide inserts is improved with new formulas and new techniques for insert bit. Gauge Structure Multiple gauge protection with gauge trimmers on the heel and gsuge inserts on the gauge suifame of the cone,tungsten carbide inserts and hardfacing on the shirttail increases gauge holding capacity and bearing life. Bearing Structure High precision journal bearing with two thrust faces.Balls lock the cone.Hard faced head bearing suiface. Cone bearing inlaid with friction-reducing alloy then silver plated.Abrasion resistance and seizure resistance of the bearing are improved. Seal and Lubrication Premium HNBR O-ring ,optimal seal compression and curved seal structure can enhance the seal performace.The pressure compensator system and advanced grease can greatly increase the lubrication reliability. Product Application It can receive high WOB in the conventional drilling.It is suitable for various formations by matching cutting structure with different tooth shape ,tooth density and tooth exposure height. IADC WOB(kN/mm)(bit dia) RPM(r/min) Applicable Formations 417 437 447 0.35--0.9 150--70 Very soft formations with low compressive strength and high drillablility ,such as clay, mudstone,chalk ,gypsum,salt, soft shale soft limestone,etc 517 527 0.35--1.0 140--60 Soft formations with low compressive strength and high drillablility such asmudstone,gypsum,salt,soft shale,soft limestone ,etc. 537 547 0.45--1.0 120--50 soft to medium formations with low compressive strength ,such as medium soft shale ,medium soft limestone,medium soft limestone,medium soft sandstone,medium formation with harder and more abrasive interbeds.etc 617 627 0.45--1.1 90--50 Medium hard formations with high compressive strength such as hard shale.limestone,sandstone,dolomite,etc 637 0.5--1.2 80--40 Hard formations with high compressive strength,such as sandstone,limestone,dolomite,hard gypsum,marble,etc Note:the upper limits of WOB and RPM in above lable should bot be used simulancously Crystal Web:http://www.bjleeding.com/ tel: 86-01057290815 mobilephone: 86-13269002360 skype: bjleeding02 QQ: 973987086 Email:leedingj@163.com leedinglj@gmail.com