Product Overview

Our coated HSS (High Speed Steel) annular cutter, also known as a coated hollow core drill bit, is a professional industrial-grade cutting tool engineered for high-efficiency, high-precision hole making in metal materials. Unlike traditional solid twist drills that remove 100% of the material in a hole, annular cutters only cut the peripheral edge, removing up to 85% less material, delivering 3-5x faster drilling speeds, and drastically reducing tool wear and operating costs.

We offer 2 premium base material options: standard M2 HSS and upgraded M35 cobalt HSS (with 5% cobalt addition), paired with industry-leading PVD metal coating technology (including TiN golden coating, TiAlN black coating, and blue nano composite coating). This combination delivers 3-5x longer service life than ordinary uncoated HSS annular cutters, making it the ideal cost-effective solution for steel fabricators, construction teams, maintenance technicians, and metalworking professionals worldwide. Universally compatible with all standard Weldon shank magnetic drill presses, it is a versatile, plug-and-play addition to your tool inventory.

Key Product Features

✅ Premium HSS Base Material, Excellent Toughness & Impact Resistance

• Standard M2 HSS Model: Made of industrial-grade W6Mo5Cr4V2 high speed steel, with overall vacuum quenching and tempering treatment, reaching a hardness of HRC 63-66. It features outstanding toughness and impact resistance, no easy chipping or breaking even under intermittent cutting and inclined drilling conditions, perfect for on-site construction and maintenance operations.
• Upgraded M35 Cobalt HSS Model: Added 5% cobalt to the HSS matrix, with an enhanced hardness of HRC 66-68. It has significantly improved red hardness, maintaining structural stability even under high-temperature cutting conditions. Specially designed for drilling medium and high hardness materials like stainless steel (304/316), alloy steel, and quenched and tempered steel, with a service life 2x longer than ordinary M2 HSS drill bits.
• ✅ Industry-Leading PVD Metal Coating Technology, Ultra-High Wear & Heat Resistance
• All our coated HSS annular cutters adopt advanced PVD (Physical Vapor Deposition) coating technology, with a uniform, dense and firmly bonded coating layer, bringing revolutionary performance improvement:
• Ultra-High Surface Hardness: The professional metal coating reaches a hardness of up to HV3200, 4-5 times harder than uncoated HSS, greatly improving the wear resistance of the cutting edges, and extending the service life by 3-5 times compared with ordinary uncoated HSS annular cutters.
• Excellent High Temperature Red Hardness: The coating maintains stable hardness and oxidation resistance even at 800-1000°C, effectively preventing cutting edges from softening and dulling under continuous high-temperature cutting, perfectly adapting to the harsh cutting environment of stainless steel and high-hardness alloys.
• Reduced Cutting Friction & Anti-Adhesion: The ultra-smooth coating surface has a very low friction coefficient, reducing cutting resistance by 30% compared with uncoated drill bits, requiring less feed force, and effectively preventing chip adhesion and built-up edge, ensuring smooth chip evacuation and clean, burr-free hole walls.
• Multiple Coating Options for Different Scenarios:
• ✅ Optimized Helical Flute Design, High-Efficiency Chip Removal & Smooth Cutting
• The drill bit adopts an optimized 38° equal-helix angle flute design, with a wide and unobstructed chip evacuation channel. The spiral guiding structure continuously discharges chips during drilling, effectively avoiding chip clogging and jamming, reducing cutting heat buildup, and ensuring stable performance in long-term continuous operation. All flutes are precision ground and polished, with a smooth surface, which further reduces friction between the drill body and the workpiece hole wall, improves drilling smoothness, and ensures a smooth hole wall finish without secondary reaming.
• ✅ Precision Ground Cutting Edges, Ultra-High Drilling Accuracy
• Each cutting tooth is precision ground with 5-axis CNC grinding technology, with strict tolerance control, delivering ultra-sharp cutting edges, minimal cutting resistance, and smooth feed. The optimized tooth tip geometry is specially developed for metal cutting, with clean cutting, no tearing, and minimal burrs. Strict concentricity control of the whole drill bit, with total runout tolerance controlled within 0.03mm, ensuring perfectly round holes with excellent verticality, no elliptical holes, no taper, meeting the high-precision requirements of industrial bolt hole drilling.
• ✅ Universal Standard Weldon Shank, Global Equipment Compatibility
• Equipped with industry-standard Weldon shanks (available in 3/4" / 19.05mm and 1-1/4" / 31.75mm universal sizes), our coated HSS annular cutters are fully compatible with over 98% of magnetic drill presses, portable magnetic drills, and vertical drilling machines on the global market, with easy, firm clamping and zero slippage during operation.

Full Product Specifications

Performance Comparison: Coated HSS Annular Cutter vs Uncoated HSS Annular Cutter

Wide Application Scenarios

Our coated HSS annular cutters are widely used in global industrial, construction, maintenance and manufacturing fields, including but not limited to:

🏗️ Steel Structure Fabrication & Construction: Fast, precise hole making for bolted connections in steel beams, I-beams, and steel plates for commercial buildings, stadiums, and industrial facilities.

🌉 Bridge, Highway & Railway Infrastructure: Heavy-duty drilling in high-strength steel for bridge girders, guardrails, and railway tracks, ensuring structural integrity and project timelines.

🚢 Shipbuilding & Offshore Engineering: Drilling in corrosion-resistant stainless steel and marine-grade steel for hull fabrication, pipe installation, and equipment mounting.

🏭 Industrial Equipment Maintenance & Overhaul: Fast, on-site drilling for power plants, petrochemical facilities, and manufacturing plants, reducing equipment downtime.

🚗 Automotive & Heavy Truck Manufacturing/Modification: Precision drilling for chassis modification, roll cage fabrication, and exhaust system installation.

🔧 HVAC, Plumbing & Electrical Installation: Clean, round hole cutting in steel ductwork, pipe supports, and electrical enclosures, with no material warping.

B2B Wholesale & OEM Services

As a professional manufacturer, we offer flexible B2B cooperation solutions for global buyers:

✅ Bulk Wholesale: Competitive factory prices for large-volume orders, with stable supply and fast global shipping.

✅ OEM/ODM Customization: Custom non-standard sizes, cutting depths, shank types, coating types, and brand logo laser engraving to meet your specific business needs.

✅ Private Label Support: Custom packaging and private labeling to build your own brand.

✅ After-Sales Support: 12-month warranty for non-human damage, 7×24-hour technical support, and full spare parts supply.

Usage Tips & Maintenance

1. Always Use Cutting Fluid: Reduce cutting temperature, lubricate cutting edges, protect the coating layer, and extend tool life, especially for stainless steel and hard alloys.
2. Match Speed & Feed to Material: Use low RPM and steady feed for hard materials like stainless steel to avoid tooth chipping.
3. Ensure Secure Clamping: Use a high-quality magnetic drill with a firmly adsorbed base to eliminate vibration, the #1 cause of premature tool wear.
4. Clean & Inspect After Use: Remove chips from flutes, inspect teeth for damage, and store in protective tubes to avoid edge chipping.
5. Professional Resharpening & Re-coating: Restore cutter performance and extend service life by 30-50% with professional resharpening and re-coating when edges dull.