Unibor

Shop Unibor magnetic drills, annular cutters, metal cutting tools, hole saws, reamers, step drills, saw blades, and drilling accessories at Diamond Tool Store. Unibor specializes in professional metal holemaking and cutting equipment designed for fabrication shops, construction sites, structural steel work, maintenance operations, and demanding industrial applications.

Unibor's product range centers around portable magnetic drilling machines and high-performance annular cutters, along with specialized tools for drilling, cutting, reaming, tapping, and countersinking metal. The manufacturer's current lineup includes magnetic drills, annular cutters, SITEH3RO™ products, saws and blades, step drills, hole saws, tapping tools, reamers, and countersinks.

Whether you're drilling structural steel in the field, producing precision holes in a fabrication shop, working on bridge construction, maintaining industrial equipment, or completing general metalworking projects, Unibor provides professional equipment and tooling designed to make metal cutting faster and more efficient.

Unibor Magnetic Drills

Unibor magnetic drills, also known as mag drills or magnetic drill presses, provide portable drilling power for steel fabrication, construction, manufacturing, and industrial maintenance.

Unlike a conventional drill press, a magnetic drill uses a powerful magnetic base to secure the machine directly to ferrous metal. This creates a stable drilling platform that can be taken directly to large steel components, structural members, machinery, and other workpieces that cannot easily be moved to a stationary drill press.

Unibor's magnetic drill lineup includes machines designed for everything from portable everyday drilling to specialized low-profile, automatic, tapping, and heavy-duty applications. Current models include the CMD350, CMD400, E3000, E4000, E4000 Perm, E5000 Auto, E5000 LP, E6000, E6000 Pivot, E8000, and HYDROBOR.

Common applications include:

• Structural steel fabrication
• Steel erection
• Construction
• Metal fabrication
• Bridge construction
• Industrial maintenance
• Machinery repair
• Manufacturing
• Welding shops
• Field fabrication
• Equipment installation
• Steel plate drilling
• Automotive and transportation work
• Oil and gas applications

For contractors who need to drill large, accurate holes away from a traditional machine shop, a portable magnetic drill can provide a major productivity advantage.

What Is a Magnetic Drill?

A magnetic drill is a portable drilling machine that uses an electromagnetic or permanent magnetic base to attach itself to compatible metal.

Once properly positioned and secured, the magnetic base stabilizes the drill while the cutter is fed through the material. This makes magnetic drills especially useful for drilling steel plate, beams, structural components, and other large metal workpieces.

Unibor notes that the portability and flexibility of magnetic drilling machines make them useful across industries ranging from steel fabrication and construction to oil and gas.

Unibor Annular Cutters

Unibor is also known for its extensive selection of annular cutters for magnetic drills.

Unlike a conventional twist drill that removes material across the entire diameter of the hole, an annular cutter removes material around the circumference and leaves a center slug. This cutting method can reduce the amount of material that must be removed while producing fast, accurate holes in metal.

Unibor offers several major annular cutter families:

• M2 HSS annular cutters
• M42 cobalt annular cutters
• TCT carbide-tipped annular cutters
• TCT rail cutters

With different materials, diameters, and cutting depths available, contractors and fabricators can select tooling based on the metal being drilled and the requirements of the application.

M2 HSS Annular Cutters

Unibor's M2 high-speed steel annular cutters provide an excellent balance of performance and value for general-purpose metal drilling.

According to Unibor, its M2 HSS range is designed primarily for mild steel and softer materials. The cutters use Unibor geometry, a Weldon shank for magnetic drills, and include the appropriate pilot pin.

The broader M2 HSS lineup includes sizes from approximately 7/16 inch through 2 inches in diameter, with cutting depths available up to 2 inches. Unibor lists applications on materials including steel, aluminum, brass, and plastic.

M2 HSS annular cutters are a strong choice for:

• General fabrication
• Mild steel drilling
• Structural steel
• Maintenance work
• Construction
• Metalworking shops
• Field drilling
• Production environments

M42 Cobalt Annular Cutters

For more demanding materials, Unibor offers M42 cobalt annular cutters.

The higher cobalt content is designed to improve performance and tool life when cutting harder materials. Unibor states that its M42 cobalt cutters can provide up to 30% longer life than its M2 cutters and are suitable for materials including steel, stainless steel, aluminum, brass, and plastic.

Unibor's M42 range includes diameters from approximately 7/16 inch through 3 inches, with cutting depths available up to 4 inches.

These cutters are an excellent option for demanding applications where standard HSS tooling may wear too quickly.

TCT Carbide Annular Cutters

Unibor's TCT carbide-tipped annular cutters are designed for demanding drilling applications and tougher metals.

TCT stands for Tungsten Carbide Tipped. Instead of relying entirely on high-speed steel for the cutting edge, these cutters use carbide cutting tips designed to withstand demanding materials and applications.

Unibor's carbide cutters feature a specialized three-tooth geometry designed to promote even tooth loading and smooth cutting. The manufacturer lists applications on tough steels, aluminum, and cast iron, with certain options available in diameters and cutting depths up to 8 inches.

TCT annular cutters are commonly selected for:

• Heavy steel fabrication
• Structural steel
• Thick plate
• Construction
• Manufacturing
• Industrial maintenance
• Large-diameter holemaking
• Demanding production environments

Unibor Rail Cutters

Railroad maintenance presents a unique drilling challenge because rail steel is extremely tough and the work often must be completed in demanding field conditions.

Unibor manufactures specialized rail annular cutters specifically for rail drilling applications.

The company's rail cutter range includes HSS/cobalt and TCT options, with sizes approximately 3/4 inch through 1-1/8 inches in diameter and a 1-inch cutting depth.

These cutters are designed for railroad construction, maintenance, repair, and other applications requiring efficient holemaking in rail.

Unibor SITEH3RO™ Metal Cutting Tools

The Unibor product family extends beyond traditional magnetic drills and annular cutters. SITEH3RO™ is part of Unibor's professional metal cutting and drilling lineup, providing additional solutions for contractors and metalworkers working on-site.

For companies performing structural steel work, fabrication, repair, and construction, having portable metal cutting tools can reduce the need to transport large components back to a fabrication shop.

Unibor Reamers

Unibor also manufactures reaming tools for metalworking applications.

Reamers are used to enlarge, align, or finish existing holes rather than creating a completely new hole from solid material. They are particularly valuable in steel erection and structural fabrication where bolt holes may require alignment before fasteners can be installed.

Typical applications include:

• Structural steel
• Steel erection
• Bridge construction
• Fabrication
• Bolt-hole alignment
• Equipment assembly
• Maintenance and repair

Unibor Step Drills, Hole Saws & Countersinks

The Unibor range also includes step drills, hole saws, and countersinking tools, giving metalworkers additional options for creating and finishing holes in different materials.

Step drills are useful when multiple hole diameters are required from one tool, while hole saws provide another solution for larger-diameter holes. Countersinks can be used to prepare holes for countersunk fasteners or finish drilled openings.

Together with magnetic drills and annular cutters, these tools allow contractors and fabricators to build a more complete metal holemaking system.

Why Use an Annular Cutter Instead of a Twist Drill?

One of the biggest advantages of an annular cutter is the way it removes material.

Instead of cutting the entire cross-section of a hole, an annular cutter removes material primarily around the outside edge and leaves a center slug. This can reduce cutting force and torque while producing clean, accurate holes.

Unibor notes that annular cutters can offer:

• Accurate holemaking
• Reduced drilling force
• Lower torque requirements
• Cleaner holes
• Reduced burrs and distortion
• Longer tool life in appropriate applications
• Faster, more efficient metal cutting

For large-diameter holes in steel, this can make annular cutters particularly effective when paired with a magnetic drill.

Choosing the Right Unibor Annular Cutter

Selecting the correct cutter depends on several factors:

• Material being drilled
• Hole diameter
• Required depth of cut
• Material hardness
• Magnetic drill being used
• Number of holes required
• Jobsite or production conditions

For general mild-steel drilling, M2 HSS may provide the right combination of performance and cost.

For harder metals and applications where additional tool life is important, M42 cobalt may be the better choice.

For demanding materials, larger diameters, or applications requiring carbide cutting performance, TCT carbide annular cutters may be preferred.

Matching the cutter to the material and machine helps improve cutting speed, hole quality, and tool life.

What Is a Pilot Pin?

A pilot pin is an important component of an annular cutting system.

According to Unibor, the pilot pin performs three primary functions:

• Helps locate the center of the hole
• Allows cutting fluid to reach the cutter
• Helps eject the slug when the cut is completed

Using the correct pilot pin for the cutter diameter and depth is important for proper annular cutter operation.

Industries That Use Unibor Tools

Unibor magnetic drills and metal cutting tools are suitable for professionals across a wide range of industries, including:

• Structural steel
• Metal fabrication
• Construction
• Manufacturing
• Welding
• Industrial maintenance
• Bridge construction
• Automotive
• Transportation
• Rail maintenance
• Oil and gas
• Equipment repair
• Mechanical contracting
• Steel erection
• Shipbuilding and marine work

The portability of magnetic drills is particularly valuable when holes must be produced directly on a structure or workpiece that cannot conveniently be moved to a stationary machine.

Why Buy Unibor from Diamond Tool Store?

Diamond Tool Store supplies professional metalworking tools, magnetic drills, annular cutters, construction equipment, cutting tools, and industrial supplies for contractors, fabricators, maintenance professionals, and commercial operations.

Our Unibor collection gives professionals access to magnetic drilling equipment and metal cutting tooling designed for demanding fabrication and construction applications.

Whether you're looking for a Unibor magnetic drill, HSS annular cutter, cobalt annular cutter, carbide annular cutter, reamer, hole saw, step drill, or metal cutting accessory, Diamond Tool Store can help you find the right tooling for the job.

Frequently Asked Questions About Unibor

What is Unibor known for?

Unibor specializes in professional metal drilling and cutting equipment. Its product range includes magnetic drills, annular cutters, SITEH3RO™ tools, saws and blades, step drills, hole saws, tapping tools, reamers, and countersinks.

What is a Unibor magnetic drill used for?

A Unibor magnetic drill is used to drill holes in steel and other compatible metals. Its magnetic base secures the drill to a ferrous work surface, providing a stable and portable drilling platform for construction, fabrication, maintenance, and industrial applications.

Does Unibor make annular cutters?

Yes. Annular cutters are a major part of the Unibor product line. Options include M2 HSS, M42 cobalt, TCT carbide, and specialized rail cutters.

What is the difference between HSS, cobalt, and carbide annular cutters?

M2 HSS cutters are well suited for general-purpose drilling and mild steel. M42 cobalt cutters are designed to provide additional tool life and performance in harder materials, including stainless steel. TCT carbide cutters are designed for more demanding metals and heavy-duty applications.

Can Unibor annular cutters cut stainless steel?

Certain Unibor annular cutters can. The manufacturer specifically lists stainless steel among the suitable materials for its M42 cobalt cutters. Cutter selection should always be based on the specific grade, thickness, machine, and application.

What size annular cutters does Unibor make?

The size range depends on cutter type. Unibor's M2 HSS range runs from approximately 7/16 inch to 2 inches in diameter, M42 cobalt options extend to approximately 3 inches, and its TCT carbide range includes options up to 8 inches in diameter.

Can Unibor annular cutters be resharpened?

Yes. Unibor states that annular cutters can be resharpened using an annular cutter sharpener, potentially extending the useful life of the tooling.

Why use an annular cutter with a magnetic drill?

An annular cutter removes a ring of material instead of cutting the entire hole into chips. This can reduce the amount of material being removed, helping produce fast and accurate holes with reduced cutting force compared with conventional large-diameter drilling methods.

Does Unibor make low-profile magnetic drills?

Yes. Unibor offers specialized magnetic drills including the E5000 LP, a low-profile model intended for drilling where available working height is limited.

What industries use Unibor magnetic drills and cutters?

Unibor tools are used in construction, structural steel fabrication, manufacturing, bridge building, automotive work, rail maintenance, oil and gas, industrial maintenance, and other professional metalworking applications.

Where can I buy Unibor magnetic drills and annular cutters?

Diamond Tool Store carries Unibor products for professional metalworking, construction, fabrication, and industrial applications, including magnetic drilling equipment and annular cutting tools.