Annular cutter
Material	High Speed Steel (HSS)	High Speed Steel (HSS)	High Speed Steel (HSS)
Cutting depth	25mm	35mm	50mm
Nominal diameter
Metric (mm)	Ø12 ~ Ø60mm	Ø12 ~ Ø60mm	Ø12 ~ Ø60mm
Imperial ( " )	Ø1/2" ~ Ø2-3/8"	Ø1/2" ~ Ø2-3/8"	Ø1/2" ~ Ø2-3/8"
Ejector pin
Ø17.9 mm below	Ø6.34*77L	Ø6.34*90L	Ø6.34*105L
Ø18 mm above	Ø7.98*77L	Ø7.98*90L	Ø7.98*105L
Shank type
Weldon(Ø19.05mm)	√	√	√
Onetouch(Ø19.05mm)	√	√	√
Fein(Ø18mm)	√	√	-
Coating	Standard	Standard	Standard
6 Piece Set	√	√	-
Applications
Steel	√	√	√
Stainless steel	√	√	√
Cast iron	√	√	√
Aluminum	√	√	√
Stacked steel	-	-	-
Railway	-	-	-
Hardox	-	-	-
Machine
Portable drilling machine	-	-	-
Pillar drilling machine	-	-	-
Magnetic drilling machine	√	√	√
Digital controlled lathe	√	√	√
Radial drill	√	√	√
Suitable Adapter
Fein to Weldon	√	√	√
One Touch to Weldon	√	√	√
Applicable Scenarios	Shipbuilding, Steel Manufacturing, Bridge Construction, Drilling Platform, Power Construction, Industrial Manufacturing

Product Overview

Our premium High Speed Steel (HSS) Annular Cutter (also known as Hollow Core Drill Bit, Magnetic Drill Bit, Steel Plate Hole Cutter, Broach Cutter, Metal Hole Saw) is a professional industrial cutting tool, specially engineered for high-efficiency, high-precision hole making in various metal materials.

We offer two material options for global customers: standard M2 HSS and upgraded M35 cobalt HSS. Both are fully compatible with mainstream magnetic drill presses worldwide, delivering outstanding toughness, stable cutting performance, and excellent cost-effectiveness. It is the ideal cutting solution for steel structure fabrication, on-site construction, engineering maintenance, and metalworking workshops, whether for portable field operations or fixed factory machining.

Core Advantages & Detailed Features

1. Premium HSS Material, Dual Options for Full Scenario Coverage

• Standard M2 HSS Model: Made of industrial-grade W6Mo5Cr4V2 high speed steel, with overall quenching and tempering treatment, reaching a hardness of HRC 63-66. It features excellent wear resistance and superior impact toughness, no easy chipping or breaking, perfect for continuous drilling on mild steel, carbon steel, structural steel and common non-ferrous metals.
• 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 sharp cutting edges even under high-temperature continuous cutting conditions. It is specially designed for drilling medium and high hardness materials like stainless steel (304/316), alloy steel, quenched and tempered steel, with a service life 2x longer than ordinary M2 HSS drill bits.
• Resharpenable & Cost-Effective: Unlike tungsten carbide tipped drill bits, HSS annular cutters have excellent resharpenability. The cutting edges can be re-ground multiple times after wear, greatly reducing long-term operating costs, especially for small and medium batch processing and routine maintenance work.

2. Precision Ground Cutting Edges & Optimized Helical Flute Design

• All cutting teeth are precision ground with strict tolerance control, delivering ultra-sharp cutting edges, minimal cutting resistance, and smooth feed. The drilling speed is far higher than traditional solid twist drill bits, producing clean, burr-free holes with smooth wall finish, eliminating the need for secondary reaming or finishing operations.
• The optimized equal-helix angle flute design provides 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.
• The precision uniform tooth distribution design ensures even force during drilling, low vibration, and high concentricity, completely avoiding hole deviation and diameter error, meeting high-precision machining requirements.

3. One-Piece Hardened HSS Body, Superior Torsional Strength

• The drill bit is made of one-piece HSS material (non-welded shank), with overall heat treatment to ensure uniform hardness throughout the body. It has super high torsional strength and anti-deformation performance, maintaining stable structural strength under high-load and high-speed rotation, no easy breakage or bending.
• The precision polished outer surface of the drill body reduces friction between the drill bit and the workpiece wall, lowers cutting heat, improves drilling smoothness, and further extends the service life of the tool.
• Strict concentricity control, with total runout tolerance controlled within 0.03mm, ensures accurate drilling, avoids tool damage and poor hole quality caused by runout.

4. Universal Standard Weldon Shank, Global Equipment Compatibility

• Equipped with industry-standard Weldon shank, available in universal sizes: 19.05mm (3/4") and 32mm (1-1/4"). It is fully compatible with more than 98% of magnetic drill presses, portable magnetic drills, and supporting drilling machines on the global market, with easy and firm clamping.
• The precision machined locking holes on the shank ensure zero slippage and no runout after clamping, excellent stability under high-speed rotation, eliminating potential safety hazards, suitable for both on-site portable operations and fixed factory machining.
• Custom non-standard shank sizes, extended shanks and other special specifications are supported to meet the needs of different equipment and working conditions.

Compatible Materials & Application Scenarios

Compatible Workpiece Materials

• M2 HSS Model: Mild steel, carbon steel, structural steel, hot rolled steel plate, cold rolled steel plate, cast iron, copper, aluminum and other common non-ferrous metals
• M35 Cobalt HSS Model: Stainless steel (304/316), alloy steel, tool steel, quenched and tempered steel, die steel, high hardness cast iron, wear-resistant alloy and other medium & high hardness metals

Main Application Scenarios

This industrial-grade HSS annular cutter is widely used in global industrial, construction and maintenance fields:

• Steel structure fabrication, metal component processing and welding prefabrication
• Bridge, highway, railway, stadium and other infrastructure on-site construction
• Shipbuilding, port equipment maintenance and offshore engineering
• Mechanical equipment manufacturing, installation, overhaul and maintenance
• Auto parts processing, modification and repair
• Pipeline installation, HVAC engineering, power plant equipment maintenance
• Sheet metal processing, chassis and cabinet hole opening, metal product fabrication

Why Choose Our HSS Annular Cutter?

1. Ultra-High Drilling Efficiency, Great Cost ReductionUnlike traditional solid twist drill bits that need to remove all the material inside the hole, our annular cutter only cuts the peripheral edge of the hole, reducing material removal by more than 80%. It delivers 3-5 times faster drilling speed with lower power consumption, greatly shortening single-hole processing time, significantly improving work efficiency, and reducing labor and energy costs.
2. Dual Material Options, Full Scenario Coverage, Unmatched Cost-EffectivenessWe provide both standard M2 HSS and M35 cobalt HSS options, covering all scenarios from regular steel drilling to high hardness stainless steel processing, meeting your different processing needs. Meanwhile, the resharpenable feature of HSS drill bits makes the long-term use cost much lower than disposable tools, making it the most cost-effective choice for processing and maintenance scenarios.
3. Strict Quality Control, Stable & Durable, Excellent Hole QualityEvery drill bit undergoes strict heat treatment control, precision grinding and full-size inspection. The concentricity, edge accuracy, and hardness all comply with international industrial standards. It produces high-precision, perfectly round holes with smooth wall finish, no need for secondary finishing, reducing rework rate, and stable quality ensures consistent performance between batches.
4. Universal Compatibility, Easy Operation, Safe & ReliableThe standard universal shank is compatible with most mainstream magnetic drill equipment worldwide, plug and play, no additional tooling required. The optimized cutting design reduces feed force, reduces operator fatigue, and the stable structural design eliminates the risk of edge chipping and breakage, improving the safety of on-site operations.

Quality Control, Packaging & Service

Strict Quality Control System

We have established a full-process quality control system, from raw material incoming inspection, heat treatment process control, precision machining process inspection, to 100% full inspection before finished product delivery, covering dimensional accuracy, hardness, concentricity, cutting edge quality and other full-item inspections, to ensure that every product meets international industrial standards and the high-quality needs of global customers.

Secure Packaging for International Transportation

• Each drill bit is individually packed in a shockproof protective plastic tube to effectively avoid bumps and edge damage during transportation, and protect the product accuracy.
• The outer packaging uses high-strength thickened corrugated cartons, suitable for long-distance international transportation such as sea freight, air freight and express delivery, moisture-proof and compression-resistant, ensuring the product arrives in perfect condition.
• Customized brand packaging, OEM printing, exclusive labels and other services are supported to meet your branding needs.

Customized Service & Technical Support

We provide full-dimensional customized services, including non-standard sizes, special materials, customized shanks, exclusive packaging, brand OEM/ODM, etc. Our professional engineering team can provide exclusive cutting solutions and technical support according to your specific processing scenarios and needs, to fully support your business development.

Warm Tips for Use

1. Please select the drill bit with corresponding material, diameter and cutting depth according to your processing material and drilling requirements: M2 HSS model is preferred for regular steel, and M35 cobalt HSS model is recommended for medium and high hardness materials such as stainless steel and alloy steel.
2. During drilling operation, please use professional metal cutting fluid/cooling lubricant, which can effectively reduce cutting temperature, extend the service life of the drill bit, and further improve the hole quality.
3. Before operation, please ensure that the drill bit is firmly clamped in the equipment, strictly follow the safety operation specifications of the drilling equipment, and control the reasonable feed speed and rotation speed to avoid overload use.
4. When the cutting edge is worn, please use professional tools to regrind the cutting edge in a standardized way, which can restore the cutting performance and extend the service life of the product.