Fibreglass-reinforced depressed centre grinding disc for general metalworking. Aluminium oxide grit, bakelite resin bond, EN12413 compliant. Available in multiple sizes from 100mm to 230mm. Ferrous metals only.
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Size
QTY
Price
QTY
115 x 6 4 x 22.2mm
1
£0.99£1.19
100 x 6.0 x 16mm
25
£0.99£1.19
Out of stock
100 x 6.0 x 16mm
25
£0.99£1.19
Out of stock
115 x 6.0 x 22.2mm
25
£0.99£1.19
Out of stock
125 x 6.0 x 22.2mm
25
£0.99£1.19
Out of stock
230 x 6.0 x 22.2mm
15
£0.99£1.19
Out of stock
The 6.4mm depressed metal grinding disc is a workhorse consumable found on practically every fabrication site, welding bay and steel fixing job in the country. Available in sizes from 100mm up to 230mm, these discs are manufactured to EN12413 with two fibreglass reinforcements, giving them the structural integrity you need when you are pushing hard against plate steel or structural sections. The depressed centre profile keeps your grinder flatter to the workpiece, which gives you better contact and more consistent results across the surface.
Each disc is produced using high grade, highly refined aluminium oxide grit bonded with a bakelite-type resin. Aluminium oxide is the standard choice for grinding ferrous metals because it cuts hard, lasts well and does not load up quickly. The resin bond keeps the grit matrix intact under the heat and friction of sustained grinding, so the disc wears evenly rather than breaking down in patches.
Where the 6.4mm Depressed Grinding Disc Gets Used
This is a general metalworking disc, so the range of applications is broad. Weld dressing is probably the most common job — running over a bead to flush it back and smooth the surface before inspection or painting. Steel preparation is another big one, whether that is removing mill scale, surface rust or old coatings before fabrication. Angle grinding down bolt heads, cleaning up cut edges, deburring plate: all standard territory for a disc like this.
The 115mm and 125mm versions are the most common sizes for day-to-day hand-held angle grinder work. The 230mm disc is more suited to larger grinders where you need to cover more ground quickly, though at that diameter you want to make sure your machine speed rating matches the disc. The 100mm disc fits smaller grinders used in tighter spaces.
EN12413 Compliance
EN12413 is the European standard that governs bonded abrasive products. It sets requirements for the mechanical properties of the disc, including burst speed testing, which matters when you consider these things spin at thousands of RPM in close proximity to your face. It is not a marketing footnote — it is the reason you should care about where your grinding discs come from. These are made to that standard, which is the baseline requirement for use in professional environments.
At under a pound a disc when bought in quantity, these are priced for trade use. Keep a stock on site and you will not be caught short mid-job.
Pro Tip: If a disc feels like it is glazing over and cutting slowly, you are more likely running too light a pressure than using a worn disc — lean into it with consistent, even force and the fresh grit will re-expose itself.
These grinding discs are used across fabrication shops, steel fixing, general construction metalwork, plumbing and mechanical engineering. Weld dressing, rust removal, scale cleaning, surface preparation before priming and deburring cut edges are all standard applications. Wherever an angle grinder meets ferrous metal on site, a disc like this is the tool being fitted to it. The depressed centre design suits flat and near-flat surface work on iron and steel.
Best For
Weld dressing and bead smoothing
Surface rust and mill scale removal
Steel preparation before coating or painting
Deburring and edge cleaning
General ferrous metalwork grinding
Compatible With
100mm angle grinders (100 x 6.0 x 16mm disc)
115mm angle grinders (115mm discs)
125mm angle grinders (125 x 6.0 x 22.2mm disc)
230mm angle grinders (230 x 6.0 x 22.2mm disc)
Iron and steel workpieces
Key Specifications
6.4mm grinding thickness (depressed centre)
High grade aluminium oxide abrasive grit
Two fibreglass reinforcements
Bakelite resin bond
EN12413 compliant
Sizes: 100mm, 115mm, 125mm, 230mm
Not suitable for: These discs must not be used on non-ferrous metals such as aluminium, copper, brass or stainless steel. The aluminium oxide abrasive and resin bond are formulated for ferrous use only, and using them on other materials can cause loading, overheating and disc failure.
Fit the disc to your angle grinder, ensuring the bore size matches your spindle and the disc speed rating meets or exceeds your machine's RPM. The depressed centre should face away from the workpiece so the flat grinding face makes full contact with the surface.
Apply consistent, even pressure at a shallow angle — roughly 15 to 30 degrees to the surface. Let the abrasive do the work. Moving too fast reduces material removal; too slow and you risk overheating the workpiece. Keep the disc moving in overlapping passes rather than dwelling in one spot.
Check the disc speed rating (RPM) matches or exceeds your angle grinder's maximum speed before fitting
Mount the disc with the depressed centre facing outward so the flat face contacts the workpiece
Tighten the flange nut securely using the correct spanner for your grinder
Stand clear and run the grinder briefly before bringing it to the workpiece, checking for vibration or wobble
Apply steady, even pressure at a shallow angle of 15 to 30 degrees to the surface
Work in overlapping passes across the material rather than grinding one spot repeatedly
Allow the disc and workpiece to cool periodically during extended grinding sessions
Inspect the disc regularly for cracks, chips or uneven wear and replace if damaged
Can I use these discs on stainless steel?
No. These are formulated for ferrous metals, meaning mild steel and iron. Stainless steel requires a dedicated stainless-compatible disc, typically one that is iron and sulphur-free to avoid contamination and corrosion in the weld zone. Using a standard aluminium oxide disc on stainless will also load up quickly and give poor results.
What is the difference between the 115 x 6.0 x 22.2mm and the 115 x 6.4 x 22.2mm disc?
The only difference is the grinding thickness: 6.0mm versus 6.4mm. Both fit the same 115mm angle grinder with a 22.2mm bore. The slightly thicker 6.4mm disc gives marginally more material to wear through, which can mean a longer service life depending on the application and grinding pressure used.
These depressed centre grinding discs are constructed with a high grade aluminium oxide abrasive grit matrix, bonded using a bakelite-type phenolic resin and reinforced with two fibreglass layers for structural integrity under load. Manufactured in compliance with EN12413, the European standard for bonded abrasive products, covering mechanical performance and burst speed requirements. The depressed centre (Type 27) profile allows flat surface grinding with full disc contact.
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