SUBORUI Weldon Shank Countersink Drill Bits are purpose-engineered for heavy-duty, high-torque chamfering operations on magnetic drills (mag drills), delivering unmatched stability and power transfer for on-site steel fabrication and industrial machining.
Crafted from premium high-speed steel (HSS) with a 3-flute 90° cutting geometry and a precision 3/4" Weldon flat shank, these bits are the trusted choice for global B2B partners including steel fabricators, construction contractors, heavy equipment manufacturers, hardware distributors, and industrial MRO service providers, ensuring consistent, burr-free results in demanding on-site and workshop environments.
Core Design & Material Advantages
Premium High-Speed Steel (HSS) Base Material
Superior Heat & Wear Resistance: Maintains cutting edge hardness at high drilling temperatures, ideal for continuous heavy-duty chamfering in steel
Exceptional Torsion Strength: Withstands extreme torque from magnetic drills, eliminating tool breakage and slippage
Long Service Life: Outlasts standard countersinks in high-volume steel fabrication, reducing tool replacement costs
3/4" Weldon Flat Shank Design (Core Differentiator)
Zero-Slip Torque Transfer: The precision flat on the shank locks securely into magnetic drill chucks, eliminating slippage even under maximum torque loads
Magnetic Drill Compatibility: 3/4" Weldon shank is the industry standard for magnetic drills, ensuring universal compatibility with all major mag drill brands
Reinforced Shank Structure: Thick, solid shank design provides maximum rigidity for heavy-duty chamfering in thick steel plates
3-Flute 90° Cutting Geometry
Smoother, Faster Cutting: 3-flute design reduces chatter and vibration, delivering a mirror-smooth finish and higher feed rates
90° Universal Angle: The global standard for countersinking screws, bolts, and fasteners, compatible with all industrial requirements
Optimized Chip Evacuation: Flute geometry clears chips efficiently, preventing clogging and heat buildup during deep chamfering in thick steel
Precision Fully Ground Manufacturing
Every countersink undergoes full CNC grinding across the cutting head, flutes, and shank, ensuring:
Ultra-tight concentricity and minimal radial runout for perfectly aligned, consistent chamfers
Ultra-sharp cutting edges for burr-free, clean cuts in carbon steel, alloy steel, and stainless steel
Consistent batch-to-batch performance, critical for professional steel fabrication operations
