1). Size from 3 7/8" to 26" 2). Stocks adequate&timely delivery 3). ISO 9001: 2008 & API spec7-1 4). Good quality and after-sale service 1>Cutting Structure The durability of premium tungsten carbide insert is improved with new formulas and new techniques for insert bit. 2>Gauge Structure Multiple gauge protection with gauge trimmers on the heel of cone, tungsten carbide inserts and hardfacing on the shirttail increases gauge holding capability and bearing life. 3>Bearing Structure High precision bearing with two thrust faces. Ball lock the cone. Hardfaced head bearing surface. Cone bearing inlaid with friction-reducing alloy and then silver-plated. Abrasion resistance and seizure resistance of the bearing are improved. 4>Seal and Lubrication Premium O-ring, Optimal seal compression and curved seal structure can enhance the seal performance. The pressure compensator system and advanced grease can greatly increase the lubricating reliability. 5>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. Please specify the following on enquiry, Bit diameter IADC code Bearing type Drilling formation Thread ConnectionSize 12 1/4” (311.2mm) IADC 517G Bearing Type Elastomer sealed journal bearing Thread Connection 6 5/8 reg pin WOB(KN/mm) 0.35~1.0 RPM(r/min) 140~60 Applicable Formations Soft formationswith low compressive strength and high drillability, such as mudstone, gypsum, salt, soft limestone, etc. Circulation system Mud pump Available sizes: 60mm, 65mm, 76mm, 93mm, 95mm, 98mm (3 7/8” ), 101.6mm, 114mm, 118mm, 120mm, 127mm(5” )130.1mm(5 1/8” ), 133.3mm (5 1/4” ), 139.7mm(5 1/2” ), 142.8mm (5 5/8” ), 149.2mm (5 7/8” )152.4mm (6” ), 155.5mm(6 1/8” ), 158.7mm(6 1/4” ), 161.9mm(6 3/8” ), 165.1mm (6 1/2” )190.5mm (7 1/2” ), 193.6mm (7 5/8” ), 200.0mm (7 7/8” )212.7mm(8 3/8” ), 215.9mm (8 1/2” ), 222.2mm(8 3/4” )241.3(9 1/2” ), 244.4(9 5/8” ), 250.8(9 7/8” )269.8(10 5/8” ), 295.3(11 5/8” )311.1(12 1/4” ), 346.0 (13 5/8” ), 349.2(13 3/4” )374.6(14 3/4” )381(15” ), 393.7(15 1/2” ), 406.4(16” )444.5(17 1/2” ), 508(20” ), 558(22” ), 609.6(24” )660.4(26” ) Available models: Steel tooth(IADC code) 111, 121, 131117, 124, 126, 127, 136, 137211, 311216, 217, 227 TCI(IADC code) 415, 435, 417, 437515, 525, 535, 545, 517, 527, 537, 547615, 625, 635, , 617, 627, 637, 737512, 522, 532, 612, 622, 632, 732
