MAXTEC Flat Metal Cutting Disc - Structural and Alloy Steel Angle Grinder Wheel

MAXTEC Flat Metal Cutting Disc - Structural and Alloy Steel Angle Grinder Wheel

The MAX flat metal cutting disc is a Type F41 cut-off wheel designed specifically for straight, controlled cutting of structural steel, mild steel, alloy steel, high-grade steel, and steel pipe. Manufactured to EN 12413 with an A30RBF aluminium oxide grain and 2A fibreglass reinforcement, it delivers a consistent cut profile with low lateral deflection across a full size range from 100mm to 350mm. For site managers, fabricators, and steelwork contractors who need a disc that performs reliably across a range of steel grades without contaminating the workpiece, this is a working tool built around the demands of professional use.

Why choose the MAXTEC flat metal cutting disc

• Iron, sulphur, and chlorine free bond: many lower-cost discs use bond formulations that introduce iron or chlorine contamination into the cut face, which is a direct problem on alloy and high-grade steels where surface integrity matters. The MAX disc avoids this entirely.
• A30RBF abrasive grade: the A30 aluminium oxide grain size paired with an RBF resinoid bond and fibreglass reinforcement gives a predictable cut rate that does not load or glaze, even on harder steel grades.
• 2A fibreglass reinforcement: two layers of woven fibreglass reinforcement resist lateral stress during cutting, reducing the risk of disc fracture when the cut line shifts or the operator applies side pressure.
• 80 m/s rated across all sizes: every variant in the range is rated to 80 m/s peripheral speed, which covers the operating envelope of all standard professional angle grinders and cut-off machines without requiring speed checks by size.
• Six size variants from 100mm to 350mm: the range covers everything from a 4-inch grinder on a fabrication bench to a 350mm cut-off machine on structural sections, with bore sizes matched to standard arbor fitments throughout.
• EN 12413 manufacture and ISO-controlled quality: unbalance is tested to ISO 6103 and run-out tolerance to ISO 13942, which means each disc meets the dimensional and rotational accuracy standards required for safe operation on professional equipment.
• Consistent cost-per-cut performance: the bond density and grain specification are calibrated to maximise disc life relative to cutting speed, reducing the number of disc changes per shift on high-volume cutting work.

What's included

• One MAX flat metal cutting disc in the selected size variant (100mm, 115mm, 125mm, 230mm, 300mm, or 350mm)

 Specifications

SIZE & PERFORMANCE

 Compatibility

Who is this for?

The MAXTEC flat metal cutting disc is aimed at structural steelwork contractors, fabricators, groundworkers, civil engineers, and general construction trades who regularly cut steel sections, bar, pipe, and plate on site or in workshop conditions. It suits both the tradesperson running a 115mm or 125mm angle grinder for detail cuts and the contractor operating a 300mm or 350mm cut-off machine on structural sections. This is not a disc for occasional DIY use: the grade and bond specification are calibrated for professional cutting rates and consistent performance across a full working shift.

Typical applications

• Cutting structural steel RSJ sections, angle iron, and box section to length on construction sites
• Cropping steel reinforcement bar and mesh on concrete pours and groundworks
• Cutting steel pipe and tube in mechanical and pipework installations
• Fabricating steel frames and brackets in workshop conditions
• Cutting high-grade tool steel components where contamination-free cut faces are required
• Removing corroded or seized steel fixings and brackets during refurbishment work
• Cutting steel sheet and plate during structural fabrication or site adaptation work

How to use

1. Confirm the disc variant matches your angle grinder or cut-off machine spindle size and that the tool's maximum RPM does not exceed the disc's rated operating speed for the selected variant.
2. Fit the disc to the tool with the correct guard in place. Ensure the flange and locking nut are tightened correctly and that the disc seats flat against the backing flange.
3. Before cutting, check the disc visually for chips, cracks, or damage. Do not use a disc that shows any sign of damage.
4. Allow the disc to run at full speed for at least 30 seconds before making contact with the workpiece, observing from the side in case of disc failure.
5. Apply steady, consistent forward pressure along the cut line. Do not force the disc into the material or twist it laterally in the cut.
6. Keep the cutting line straight. Lateral movement under load is the primary cause of disc fracture on cut-off wheels.
7. Allow the disc to cool between cuts on heavy sections. Do not quench a hot disc with water.
8. After use, remove the disc from the tool and store flat in a dry environment away from impact risk.

Safety and maintenance

Safety during use:

• Eye protection is mandatory: use approved safety goggles or a full face shield rated to EN 166. Abrasive cutting generates high-velocity sparks and fragmented abrasive particles at all operating speeds.
• Wear cut-resistant gloves to EN 388 when handling and fitting discs, and during cutting operations where hand proximity to the work is unavoidable.
• Hearing protection is required: angle grinders and cut-off machines operating at cutting speeds generate noise levels that exceed 85dB(A) in most applications. Use ear defenders or plugs to EN 352.
• Respiratory protection: grinding and cutting steel generates nuisance dust classified as a respiratory irritant. Where local exhaust ventilation is not available, wear a dust mask rated to at least FFP2 (EN 149). Prolonged or high-level exposure can aggravate existing respiratory conditions.
• Never exceed the maximum operating RPM marked on the disc for the selected variant. Over-speeding a bonded abrasive disc is a primary cause of disc burst.
• Do not use this disc for grinding operations. It is a cut-off wheel designed for straight cutting only. Side loading a cut-off disc risks lateral fracture.
• The Abrasive Wheels Regulations 1970 (as incorporated into PUWER 1998) require that abrasive wheels are only mounted and operated by trained and appointed persons. Ensure all operators have received appropriate training before using this product.

After use and storage:

• Inspect the disc after each use for chips, cracks, delamination of the reinforcement layers, or signs of excessive wear. Discard any disc that shows damage.
• Store discs flat in a dry environment at a stable temperature. Avoid storing discs where they are subject to impact, vibration, or damp conditions, which can degrade the resinoid bond over time.
• Do not stack heavy objects on top of stored discs.
• Dispose of worn or damaged discs as general factory waste in accordance with local site waste management procedures.

Frequently Asked Questions

Q: What steel types can the MAXTEC flat metal cutting disc cut?

 A: The disc is suitable for structural steel, mild steel, alloy steel, high-grade steel, tool steel, steel pipe, and sheet steel. It is not designed for stainless steel, which requires a dedicated inox disc to avoid contamination of the cut face and to maintain the corrosion resistance of the material.

Q: What does EN 12413 mean and why does it matter on a UK site?

 A: EN 12413 is the European harmonised standard for bonded abrasive products, covering safety requirements for the manufacture of resin-bonded cutting and grinding wheels. A disc manufactured to EN 12413 has been made to controlled specifications for dimensional accuracy, maximum operating speed, and structural integrity. On a UK construction site, using abrasive discs that meet EN 12413 is the baseline for demonstrating compliance with the Abrasive Wheels Regulations (as incorporated into PUWER 1998) and supports your risk assessment documentation. Discs that do not carry EN 12413 certification should not be used in professional applications.

Q: What does the A30RBF grade specification mean in practice?

 A: A30RBF describes the full abrasive specification of the disc. A indicates aluminium oxide (corundum) as the abrasive material. 30 is the grain size, which sits in the medium range and balances cutting aggression with disc life. R is the hardness grade of the bond, indicating a moderately hard bond that resists wear without becoming excessively aggressive. B is the bond type, resinoid, which gives the disc its flexibility and impact resistance compared to vitrified bonds. F denotes the specific bond modification. Together, this specification means the disc cuts quickly through steel without loading, and the bond releases worn grains at a rate that maintains a consistent cutting edge throughout the disc's life.

Q: Why does it matter that the disc is free from iron, sulphur, and chlorine?

A: On standard mild steel this is less critical, but on alloy steels, high-grade steels, and any steel that will be subsequently welded or treated, contamination from iron, sulphur, or chlorine in the abrasive bond can cause surface defects, weld porosity, or corrosion initiation at the cut face. Fabricators and structural engineers working to quality standards or welding procedures will often specify contamination-free abrasives as a condition of the work. This disc meets that requirement across the full range.

Q: Can I use this disc on a cut-off machine as well as an angle grinder?

 A: Yes. The MAX flat metal cutting disc is compatible with both angle grinders and stationary or portable cut-off machines, provided the spindle bore matches the disc variant selected and the tool's maximum RPM does not exceed the rated operating speed for that disc size. Always check the RPM rating printed on the disc label against your tool's nameplate before fitting.

Q: What is the difference between the 115mm and 125mm variants?

A: The primary difference is the bore size and the rated maximum RPM. Both variants share a 3.0mm thickness and 22.23mm bore, but the 125mm disc is rated to 12,200rpm compared to 13,300rpm for the 115mm. Choose the variant that matches the guard and flange configuration of your specific angle grinder. Many 115mm grinders will accept a 125mm disc with the correct guard fitted, but always verify your tool's specification before fitting a larger disc.

Q: How do I know when the disc needs replacing?

 A: Inspect the disc visually before every use. Replace the disc if you see any cracks, chips to the edge or face, delamination of the fibreglass reinforcement, or if the disc has worn down to the point where the bond and abrasive layer is significantly reduced. Do not attempt to use a disc that has been dropped onto a hard surface without inspection, as impact damage to the bond is not always visible. Discs that have been stored in damp conditions or subjected to temperature extremes should also be inspected carefully before use.

Q: Can this disc be used for side grinding or smoothing a cut face?

 A: No. This is a Type F41 flat cut-off wheel designed exclusively for straight cutting operations. Using it for side grinding or applying lateral pressure during a cut puts stress on the disc in a direction it is not designed to resist, which significantly increases the risk of disc fracture. For grinding and surface blending work on steel, use a dedicated Type 27 depressed centre grinding disc.

Q: Are operators required to have specific training to use this product?

A: Yes. Under the Abrasive Wheels Regulations 1970, as incorporated into the Provision and Use of Work Equipment Regulations 1998 (PUWER), abrasive wheels must only be mounted and operated by persons who have been trained and appointed by their employer. This is a legal requirement, not a recommendation. Training typically covers correct disc selection, mounting procedures, inspection, operating speeds, guarding requirements, and emergency procedures. Many training providers offer one-day abrasive wheels courses that satisfy this requirement.

Q: Why should I buy from CMT Group rather than a general tool merchant?

 A: CMT Group has supplied construction and industrial sites across the UK since 2010 and holds FORS Silver Accreditation across its entire delivery fleet. Orders placed by 7pm online (or 5pm by phone) qualify for next working day delivery to UK mainland addresses, and a VIP dedicated delivery service is available UK-wide for urgent site requirements, dispatched within 30 minutes on a dedicated vehicle. CMT's EDGE procurement portal gives construction buyers agreed contract pricing, full order history, and live delivery tracking with What3Words integration, removing the admin overhead from repeat abrasive consumable ordering. If you have a question about the right disc variant for your application, CMT's trade team can advise before you order.