Xiamen Bestlink Factory Co., Ltd.  

Product Name: Br1 Medium Air Pressure DTH Drilling Tools for Construction Model NO.: BR Series Usage: Well Drilling Material: Tungsten Carbide Type: Center Drill Bit Length: Stub-length Certification: ISO9001 Customized: Customized Model Number: Br1, Br2 Machine Type: Drilling Tools Application: Energy, Transportation, metallurgy, Building etc. Function: Rotation Impact Drilling Condition: New Hole Diameter: 64mm - 90mm Trademark: BESTlink Transport Package: Wooden Case Specification: ISO Origin: Xiamen, China HS Code: 82071990 Product Description Br1 Medium Air Pressure DTH Drilling Tools for ConstructionDTH bitis also our main product. After mang years search, we have rich experience in development and manufacturing high quality products, which adopted high-quality raw materials, advanced technology and passed through strictly inspection.1.Various air pressure down-the-hole drill bits2.Low air pressure hole Dia.:65-220mm 3.High air pressure hole Dia.:85-305mm 4.Face type: drop center / concave / convex / double gauge / flat Technical data:Drill BitsBit Dia. (mm)NO. of Air holesGauge ButtonsFront ButtonsWeight (KGS)Part No.BR16426×φ103×φ102.6HBR1-647026×φ124×φ92.8HBR1-707626×φ125×φ103.2HBR1-76BR27626×φ125×φ103.6HBR2-768026×φ135×φ104HBR2-809026×φ136×φ104.2HBR2-90HD257626×φ135×φ103.6HD25-768226×φ144×φ114HD25-829028×φ125×φ124.2HD25-90We can design and manufacture according to customer's requirement of the bit dia., no. of air holes, carbide button shape and face shape.----Selection of DTH BIT FACE SHAPE AND CARBIDE BUTTON SHAPE----A: Bit face shape selectionDropCenter BitFor high penetration rates in soft to medium-hard and fissured rock formations. Low to medium air pressures. Maximum hole deviation control.Concave faceThe all-round application bit face specifically for medium hard and homogenerous rock formations. Good hole deviation control and good flushing capacity.Convex faceFor high penetration rates in soft to medium-hard with low to medium air pressures. It is the most resistance to steel wash, and may reduce the load and wear on the gauge buttons, but poor hole deviation control.Double Gauge faceThis kind of face shape is suitable for fast penetration rates in medium to hard rock formations. Designed for high air pressures and good resistance to steel wash step gauge bit.Flat Face BitThis kind of face shape is suitable for hard to very hard and abrasive rock formations in applications with high air pressures. Good penetration rates an resistance to steel wash.B: Insert Carbide Button Shape SelectionMatching the insert to the job requirements is essential in achieving the desired results. Different buttons is ideal for different ground conditions, abrasion levels, PSIs and penetration levels. In general, the larger the number of gauge buttons the better overall performance, especially in hard rock.Hemispherical? Height 0.5 Ø? Application Strength - multipurpose? Best suited to hard ground? 25,000 to 45,000 PSI (170 to 300 MPa)? Abrasive to very abrasiveBallistic Button? Height 0.75 Ø? Application Strength - fast penetration? Best suited to soft ground? 10,000 to 20,000 PSI (70 to 140 MPa)? Non abrasive groundParabolic Button (semi ballistic)? Height 0.6 Ø? Application Strength - fast penetration? Best suited to medium ground? 15,000 to 25,000 PSI (100 to 170 MPa)? Mildly abrasive groundConical Button? Height 0.65 Ø? Application Strength - fast penetration? Suited for all non-abrasive ground types? Smaller contact area? Best suited for smaller diameter bits