The Mirka MR-508-G is a 5 in. pneumatic random orbital finishing sander featuring an aggressive 8 mm (5/16 in.) orbit engineered for rapid material removal, surface prep, and leveling across automotive, woodworking, composite, and industrial applications. Designed in a non-vacuum configuration, this high-performance air tool delivers fast cutting action in production environments where integrated dust extraction is not required or dust is managed independently.

Constructed with a lightweight, precision-molded composite housing, the MR-508-G dampens operating sound and vibration to minimize user fatigue during extended sanding operations. Its counter-balanced internal drive mechanism is specifically weighted for 5 in. backup pads to ensure smooth, controllable palm operation under heavy load. Powered by a moisture-resistant composite rotor and supported by premium counterweight bearings, the pneumatic motor generates a true 12,000 RPM output for consistent cutting speeds. If dust extraction requirements change over time, MR-Series sanders can be converted to vacuum operation using an optional external or self-generating vacuum adapter kit.

This MR-508-G package provides ultimate abrasive versatility by including both Grip (hook-and-loop) and PSA (peel-and-stick) backing pads out of the box, allowing operators to switch between attachment styles without purchasing additional mounting hardware.

Features & Benefits

• 8 mm Orbit: Larger orbit diameter provides aggressive cutting performance for rapid stock removal and fast surface preparation.
• 12,000 RPM Output: True high-speed motor maintains consistent sanding speeds under load for improved productivity.
• Composite Construction: Precision-molded composite body reduces overall tool weight while dampening sound for enhanced operator comfort.
• Moisture-Resistant Composite Rotor: Engineered to withstand airline moisture for long-term mechanical reliability.
• Premium Counterweight Bearings: Balanced internal construction delivers smooth operation and extended bearing life.
• Dual Backing Pad Support: Supplied with both Grip (hook-and-loop) and PSA backing pads for immediate compatibility with either disc style.
• Convertible Dust System: Operates as a simple non-vacuum sander with the flexibility to adapt to vacuum extraction later.

What's Included

• (1) 5 in. Pneumatic Finishing Sander (8 mm Orbit, Non-Vacuum)
• (1) 5 in. Grip Backing Pad
• (1) 5 in. PSA Backing Pad

Shipping: Beaver Industrial Supply offers free shipping on orders over $199, with the exception of Sawstop and Laguna, which require additional fees to be collected. Other exceptions apply as noted on product pages.

We reserve the right to determine the fastest and most cost-effective manner of transportation for all orders that qualify for free shipping. Our shipping carriers cannot deliver to PO box or U.S. military post office box addresses, such as APO and FPO, so we require a physical street address for delivery. We use USPS, which typically takes 2-8 days for delivery, depending on your location, for smaller items and UPS Ground for all other ground shipments under 150 pounds.

• Returns: We accept returns and exchanges for a fee up to 30 days in unopened, new, and unused condition in the original packaging. Exceptions apply.

Please note, NO REFUNDS will be given on any new, used, or damaged item if it is not returned in the original packaging, no matter what condition the packaging is in. If the item qualifies for free shipping, you will be charged the original shipping cost and are responsible for shipping the product back with the shipping carrier of your choice.

We must receive the item undamaged. We recommend you package it accordingly and purchase insurance for higher-priced items to ensure you receive the full refund minus any incurred fees as applicable. We reserve the right to refuse the return of accessories.

Because items are your responsibility until they reach us, we recommend that you send the parcel using a delivery service that insures you of the value of the goods. Return shipping is at the customer's cost. At Beaver Industrial Supply’s discretion, delivery charges can be refunded if the goods are defective.

Returns require a return authorization number. Please call customer service at 314-773-5999 or submit a customer service inquiry to start the exchange or return process and receive an authorization number.

Machinery too large for parcel shipment (palletized or crated) is only returnable if there is a material defect that cannot be resolved by replacing components.