Looking for 20 inch sanding discs that deliver a smooth, even finish on hardwood floors and large surfaces? This guide highlights five dependable options ideal for floor buffers and rotary machines. Each product is chosen for durable backing, grit range, and compatibility with common 20″ sanders. Best for: professionals refinishing hardwood, DIYers upgrading floors, and contractors seeking long-lasting discs with consistent cuts. Below you’ll find quick picks, benefits, and practical buying considerations.
| Product | Grit | Backing | Best For |
|---|---|---|---|
| Sungold Abrasives 81605 | 60 | Mesh screen | Even cut, extended life on floor refinishing |
| Mercer Industries 447080 | 80 | Screen | Removing old finishes on wood floors |
| Mercer Industries 430036 | 36X | Cloth backing | Hardwood and concrete prep |
| Red Label Abrasives 20″ 80 Grit | 80 | Adhesive cloth | General wood and light metalwork |
| 3M PSA Cloth Disc 348D | 80 | PSA cloth | Aggressive sanding with heat resistance |
Sungold Abrasives 81605 60 Grit Mesh Disc – 20″
Product: Sungold Abrasives 81605 Silicon Carbide 60 Grit Screen Sanding Discs, 10-Pack, 20″
Best for: Floor refinishing projects where a uniform abrasive coat ensures a consistent cut from start to finish. The mesh screen construction with strong fibers provides extended life by allowing dust to escape and reducing loading. Use on both sides for longer disc life, especially on large floor jobs.
Why selected: This disc emphasizes a uniform abrasive coating and dual-sided use, making it a reliable choice for large-area sanding where durability matters. It’s well-suited for hardwood floors as a first-pass or intermediate step before final finishing.
Limitations: 60 grit is mid-range; for heavy stock removal you may want a coarser option first or a finer option after initial passes.
Mercer Industries 447080 Floor Sanding Screen Disc – 80 Grit
Product: Mercer Industries 447080 Floor Sanding Screen Disc, 10 Pack, 20″, Grit 80
Best for: Floor buffer or rotary floor machines when removing old finishes or wax between coats. Suitable for restoring worn wooden floors and preparing surfaces for refinishing steps.
Why selected: The 80 grit screen is a versatile middle-ground option, balancing aggressive material removal with a smoother final surface. It suits intermediate steps in floor refinishing where even abrasion is needed.
Limitations: Designed for floor buffers; not ideal for fine detail work or metalworking outside floor prep contexts.
Mercer Industries 430036 Silicon Carbide Floor Sanding Disc – 36X Cloth Back
Product: Mercer Industries 430036 Silicon Carbide Floor Sanding Disc, Cloth Back, 20″ x 2″ Hole, Grit 36X, 20-Pack
Best for: Hardwood and concrete prep that requires sturdy cloth backing and silicon carbide grain for steady performance at a competitive price. The 2″ center hole attaches to common 20″ floor machines with solid backing for stability.
Why selected: Cloth back provides durability on tougher surfaces, making it a solid choice for initial heavy-duty prep where heat resistance and strength matter.
Limitations: 36X is a coarser grit; may leave deeper scratches if not followed by finer grits for finishing. Use in combination with finer grits for best results.
Red Label Abrasives 20 Inch 80 Grit Adhesive Back Disc
Product: Red Label Abrasives 20 Inch 80 Grit Adhesive Back Multipurpose Sanding Disc
Best for: General-purpose sanding on wood, plastic, and light metalworking. The adhesive cloth backing provides reliable attachment to sanding tools and helps resist clogging during softwood or hardwood work.
Why selected: A versatile option for mixed-material projects and finishing prep where an even 80 grit cut is desired without specialized backing curves or holes.
Limitations: Adhesive-backed discs may peel if used aggressively on very hard surfaces or with poor dust removal setups. Ensure proper machine alignment for best results.
3M PSA Cloth Disc 348D – 80 Grit
Product: 3M PSA Cloth Disc 348D, Aluminum Oxide, 20″ Diameter, 80 Grit, Brown (Pack of 10)
Best for: Aggressive sanding with heat resistance on large 20″ sanders. The aluminum oxide on a heavy-duty cloth backing is designed for durable, long-lasting performance.
Why selected: The PSA (pressure-sensitive adhesive) backing provides quick, secure mounting and reliable performance in demanding sanding tasks, making it a strong option for professional shop use.
Limitations: PSA discs require careful surface prep and removal if disc edges show signs of wear to maintain even contact with the work surface.
Buying Guide
- What grit should I choose? For floor prep, start with coarser grits (around 36–60) to remove old finish, then progress to finer grits (80–100) for a smooth base before finishing coats.
- What backing type matters? Cloth backs are durable for heavy stock removal; mesh screens resist loading and stay cooler; PSA and adhesive backs offer quick changes for efficient workflows.
- Will I be using a floor buffer or a hand-held sander? Large 20″ discs are designed for floor buffers or rotary machines; ensure your sander accepts the disc type (screen, cloth, or PSA).
- How important is disc longevity? Mesh screen and dual-sided discs extend life on large jobs by reducing clogging and enabling reuse on both sides.
- Should I mix disc types? Yes. Use a coarser grit to remove material, then finish with finer grits; pair silicone carbide discs for hardwood and aluminum oxide discs for general wood prep.
- What about disc maintenance? Keep dust out of the sanding area and practice even pressure to avoid gouging; replace discs that show glazing or heavy wear to maintain consistent results.
Frequently Asked Questions
- What size are these sanding discs? They are designed for 20-inch sanding machines common in floor finishing.
- Can I use the same disc on both sides? Some screen discs are labeled for dual-side use, which extends life; check product details for your model.
- What is the difference between screen and cloth discs? Screen discs provide cooler operation and longer life on large surfaces; cloth discs offer strong backing for aggressive material removal.
- Which grit sequence is best for hardwood floors? Start with 36–60 for heavy stock removal, then use 80–100 to prepare for finish coats.
- Are PSA discs easier to change on the machine? PSA discs attach with adhesive and are often quicker to change; ensure proper alignment and surface cleanliness.
- Should I worry about heat build-up? Yes. High-speed sanding on large areas can create heat; use discs with good heat resistance and avoid excessive pressure.