125mm Backing Pad Sanding Discs for Bosch PEX 300 AE 400 AE

Upgrade your sanding and polishing setup with these precision-engineered 125mm Backing Pad Sanding Discs, designed as direct-fit replacements for Bosch PEX 300 AE, PEX 400 AE, and PEX 4000 AE orbital sanders and polishers. Whether you're tackling woodworking projects, surface finishing, or automotive detailing, these durable backing pads deliver consistent, professional-level results every time.

Key Features

• Perfect Compatibility: Engineered specifically for Bosch PEX 300 AE, PEX 400 AE, and PEX 4000 AE models — also compatible with Bosch ROS20 random orbital sanders.
• 5-Inch / 125mm Diameter: Standard sizing ensures a secure, wobble-free fit with hook-and-loop (Velcro-style) sanding discs.
• Durable PU Construction: Made from quality polyurethane material for long-lasting flexibility and wear resistance through repeated use.
• Smooth, Even Finish: The firm yet flexible backing pad distributes pressure evenly across the surface, minimizing swirl marks and uneven abrasion.
• Easy Replacement: Designed to seamlessly replace worn-out OEM backing pads, restoring your sander to like-new performance without the cost of a full tool replacement.
• Versatile Use: Ideal for wood sanding, paint preparation, metal finishing, and polishing applications in workshop or home settings.

Specifications

• Type: Backing Pad / Sanding Pad
• Diameter: 125mm (5 inch)
• Compatible Models: Bosch PEX 300 AE, Bosch PEX 400 AE, Bosch PEX 4000 AE, Bosch ROS20
• Attachment: Hook-and-loop (Velcro) interface
• Material: Polyurethane (PU)

What's in the Box

Package includes backing pad sanding discs as described. Please refer to the product listing variant for exact quantity.

For guidance on safe tool use and workshop best practices, visit the OSHA Tools & Equipment Safety resource.

Frequently Asked Questions

Q: Which Bosch sander models are these 125mm backing pads compatible with?

A: These backing pad sanding discs are engineered specifically for the Bosch PEX 300 AE, PEX 400 AE, and PEX 4000 AE random orbital sanders and polishers. They are also compatible with the Bosch ROS20. Always verify your model number before ordering to ensure a correct fit.

Q: What type of sanding discs work with this backing pad?

A: This 125mm (5-inch) backing pad uses a hook-and-loop (Velcro-style) interface, which means it is compatible with standard 125mm hook-and-loop sanding discs in any grit. Simply press your chosen sanding disc onto the pad and it locks firmly in place — no adhesives needed.

Q: How do I know when my backing pad needs replacing?

A: Common signs that a backing pad needs replacement include visible wear or flattening of the hook-and-loop surface, discs no longer adhering firmly, vibration during use, or uneven sanding results. Replacing the backing pad promptly restores optimal performance and protects both your workpiece and the sander motor.

Q: Is this a genuine Bosch part or an aftermarket replacement?

A: This is a high-quality aftermarket replacement backing pad by Qme, designed to match the dimensions and performance of the original Bosch backing pad for PEX 300 AE, PEX 400 AE, and PEX 4000 AE models. It offers a cost-effective way to restore your sander without purchasing a new tool.