Silverline Zirconium Flap Disc Sanding Grinding 115mm 40 grit 633890

Silverline Premium Zirconium Heavy Duty Flap Disc Sanding Grinding 115mm - 40 grit - 633890

Barcode: 5055058198617

MPN: 633890

Overview:

The Silverline 40 Grit Premium Metal Finishing Zirconium Heavy Duty 115mm Flap Disc 633890 built for aggressive grinding and rapid stock removal on metal. Designed for use on an angle grinder, it’s ideal for dressing welds, removing parting lines on castings and grinding carbon steels where speed and durability matter. The zirconium abrasive and high grain adhesion help deliver a long working life, while the flap construction offers better control and blending than a rigid grinding wheel. Suitable for steel, stainless steel, cast iron and many alloys, it mounts directly to a compatible angle grinder with no separate backing disc required.

Key Features

• Coarse 40 grit for fast cutting and heavy stock removal

• Zirconium abrasive for strong performance and long wear

• High grain adhesion for extended disc life in demanding work

• Flap construction helps grind and blend with improved control

• Suitable for weld dressing, deburring and surface preparation

• Fits directly to an angle grinder (no backing pad required)

Specifications

• Brand: Silverline

• MPN: 633890

• Barcode: 5055058198617

• Disc Diameter: 115mm

• Grit: 40 grit

• Abrasive Material: Zirconium

• Disc Type: Flap disc (sanding/grinding)

• Backing Weight: J

• Bond Type: Resin

• Surface Finish: Semi open coat

• Max Speed: 13,300rpm

• Backing Disc Required: No

Applications

• Heavy stock removal and fast grinding

• Weld dressing and weld clean-up

• Removing parting lines on castings

• Deburring edges and blending profiles

• Preparing metal surfaces before finishing or coating

How to Use

• Check your angle grinder and guard are suitable for a 115mm disc

• Ensure the disc’s max RPM meets or exceeds your grinder speed

• Fit the flap disc securely following the grinder manufacturer instructions

• Let the grinder reach full speed, then apply light, controlled pressure

• Keep the disc moving to reduce heat build-up and produce a more even finish

• Step up to finer grits (e.g., 60/80/120) for smoother finishing if required

Silverline 40 grit 115mm Zirconium Flap Disc – Key FAQs

• What is a 40g flap disc best used for?
  40g is a coarse grade designed for aggressive removal—ideal for grinding welds, shaping metal and stripping back material quickly before refining with finer grits.

• Can I use this flap disc on stainless steel?
  Yes. It’s suitable for stainless steel, mild steel, cast iron and many alloys. Use controlled pressure and keep the disc moving to reduce heat and discolouration.

• Do I need a backing pad with this disc?
  No. This flap disc mounts directly to a compatible angle grinder, making set-up quicker and reducing extra accessory requirements.

• What does “semi open coat” mean on a flap disc?
  Semi open coat leaves more space between abrasive grains, helping reduce loading and keeping the disc cutting effectively during heavier grinding and sanding tasks.

• What does the 13,300rpm rating mean?
  It’s the maximum safe operating speed of the disc. Always check your grinder’s no-load RPM is at or below the disc rating before use.

• How do grit grades work for flap discs?
  Lower grit numbers (like 40) are coarser for faster removal, while higher numbers (up to around 120) are finer for finishing and surface refinement.

How the grit grades work - 40 grit being coarse and 120 grit being the finest - All Sanding Flap Discs