125mm Sanding Discs | 8-Hole Hook & Loop | 40-2000 Grit Assortment

These 5-inch, 8-hole sanding discs fit common 125mm random orbital sanders. The hook and loop backing makes grit changes fast. These silicon carbide discs work for both wet and dry sanding.Features and Benefits - Hook and Loop System - Attach and remove these 5-inch velcro discs in seconds. You can change grits without stopping your work. - 8-Hole Dust Pattern - This pattern lines up with most random orbital sander pads. It pulls dust away, keeping your surface cleaner and making the discs last longer. - Assorted Grit Range (40-2000) - The set has grits from coarse 40 for heavy material removal to fine 2000 for polishing. - Wet and Dry Use - The silicon carbide abrasive and waterproof backing are good for dry woodworking or wet sanding car paint and plastics.Applications - Woodworking Finishes - Use lower grits to flatten wood or strip old finishes. Then, use higher grits for a smooth surface before staining or oiling. - Automotive Sanding - Use these discs to prepare panels for paint, feather body filler, and color sand clear coats to remove orange peel. - Metal and Composites - Clean welds, remove light rust from steel, or scuff fiberglass and other composite materials for repair or painting. Step 1: Mount the Sanding Disc to the Mandrel This section explains how to attach 125mm Sanding Discs to a mandrel, a common method for using smaller sanding discs with rotary tools. While these 125mm discs are designed for random orbital sanders with their hook and loop attachment, smaller discs often require a mandrel for use with other tools. For these 125mm discs, the hook and loop backing adheres directly to the backing pad of your random orbital sander. Ensure the disc is centred on the pad for balanced operation and effective dust extraction. Option A: Standard Screw Mandrel (402) For smaller sanding discs that require a mandrel, the standard screw type is a common choice. To use, simply unscrew the top washer, place the sanding disc onto the screw, and then re-tighten the washer to secure the disc firmly. This method provides a reliable attachment for various rotary tool applications. However, for the 125mm Sanding Discs with hook and loop backing, a mandrel is not required; they attach directly to your random orbital sander's backing pad. Option B: EZ Lock Mandrel (EZ402) The EZ Lock Mandrel system offers a quick and tool-free method for changing smaller sanding discs. To attach a disc, simply pull back the spring-loaded collar, insert the disc, and release the collar. This mechanism locks the disc securely in place, allowing for rapid changes between different grits without the need for additional tools. Again, these 125mm Sanding Discs with hook and loop are designed for direct attachment to a random orbital sander, not a mandrel. Step 2: Insert the Mandrel into Your Dremel This step applies when using smaller sanding discs with a Dremel tool. If you're using a mandrel, insert the shaft of the mandrel into the collet of your Dremel tool. Tighten the collet nut securely to ensure the mandrel is held firmly and does not wobble during operation. For the 125mm Sanding Discs, designed for random orbital sanders, this step is not applicable. These discs attach directly to the sander's backing pad and are not typically used with Dremel tools. Step 3: Best Practices for Sanding When using 125mm Sanding Discs on your random orbital sander, always start with a lower grit, such as 40 grit, for heavy material removal. Progress through higher grits, like 80 grit or 220 grit, to refine the surface and remove previous scratch marks. Apply light, even pressure and keep the sander moving to avoid swirl marks. For optimal dust extraction, ensure your sander's dust collection system is active. A hook and loop sanding disc will last longer if you avoid excessive pressure and overheating. Replace the disc when the abrasive wears down or becomes clogged.