The Mirka Coarse Cut 8" 9H Grip, model 40-632-040, is a coarse sanding disc built for heavy surface prep and fast material removal. This is a sanding disc designed for coarse sanding work. If you are stripping paint, leveling rough wood, cleaning up metal, or starting a sanding sequence where speed matters more than finish quality, this is the kind of abrasive that makes sense.

What matters here is the combination of P40 grit, reinforced backing, and dust binding properties. In plain terms, that means the disc is made to cut aggressively while standing up to the kind of pressure that comes with rough sanding. It is intended for the early stages of the job, where you are removing stock, knocking down edges, or clearing away old coatings before moving on to finer grits.

The 8-inch size gives you broad surface coverage, which is useful on tabletops, panels, sheet goods, fiberglass parts, and larger metal surfaces. The 9-hole grip pattern is there for use with compatible hook-and-loop sanding pads that support dust extraction. That helps keep the abrasive working cleaner, especially on jobs that produce a lot of dust during sanding and paint removal.

Mirka lists this abrasive for a wide spread of materials, and that is a real advantage on mixed-material work. It is suitable for steel, mild steel, stainless steel, cast iron, non-ferrous metal, hardwood, pine, soft wood, chipboard, MDF, HDF, plastics, synthetic materials, glass fibre, lacquers, and paint stripping. For a shop or contractor who moves between wood prep and surface cleanup on metal or composite parts, that flexibility matters.

This Mirka sanding disc is best used where finish quality is not the first priority yet. P40 is for the rough stage. It is the disc you reach for when you need to get through old finish, flatten a problem area, or remove material quickly before stepping down to P80 or finer. If you are expecting a ready-to-finish surface from this grit, you are skipping the process.

Who should buy it? Body shops, woodworkers, cabinet refinishers, remodeling contractors, and serious DIY users who need an 8-inch coarse sanding disc for real prep work. The Mirka Coarse Cut 8" 9H Grip is especially useful for anyone already running a compatible 8-inch 9-hole grip sander setup and looking for a dependable abrasive for the first pass.

Mirka Coarse Cut 8" 9H Grip Gets Right to the Dirty Work

If the job starts with rough sanding, stripping, or knocking down material fast, this is the disc you want on the machine before the finer grits come out.

• Who it's for: Woodworkers, refinishers, body shop techs, and contractors doing heavy prep on wood, metal, fiberglass, or painted surfaces.
• Why it stands out: You get aggressive P40 cutting action, reinforced backing for tougher sanding, and a broad material range instead of a disc that only makes sense for one kind of work.
• Worth knowing: This is a coarse abrasive, so it is built for removal speed, not finish quality. Plan on following it with finer discs if the surface needs to be ready for paint or finish.

• What kind of sanding is this disc made for? It is made for coarse sanding and fast material removal at the early stage of surface prep.
• What materials can it be used on? Mirka lists it for steel, mild steel, stainless steel, cast iron, non-ferrous metal, pine, hardwood, soft wood, plastics, synthetic materials, glass fibre, lacquers, paint removal, chipboard, and MDF / HDF.
• What size machine does it fit? It is an 8-inch disc with a 9-hole grip pattern, so it is intended for compatible 8-inch hook-and-loop sanding setups with a matching hole layout.
• Is this a finishing disc? No. The P40 grit is meant for aggressive removal and rough prep, not final finish sanding.