20" Grinding Wheels | McMaster-Carr

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19 Products

Centerless Grinding Wheels

Remove material and shape metal cylindrical forms or parts without the need for centers or fixtures. These wheels have tight dimensional tolerances and create a smooth surface. They’re good for grinding numerous materials with just a few machines.

Caution: Use only accessories that have a greater rpm rating than the maximum speed of the grinder you choose.

							Wheel
	Dia.	Thk.	Arbor Hole Size	Max. Rotation Speed, rpm	Abrasive Material	Abrasive Bond Material	Designation	Shape	Grit (Surface Texture)	Norton Abrasive Grade		Each
64A Light Gray—VCE Bond







				For Steel and Iron

				20"	6"	12"	1,620	Aluminum Oxide	Vitrified Clay	Type 1	Straight	60 (Rough)	K	4797N11	000000000


				20"	8"	12"	1,620	Aluminum Oxide	Vitrified Clay	Type 1	Straight	60 (Rough)	K	4797N12	00000000

Floor-Mount Cutoff Saw Wheels for Metal


	Side View

Cut through aluminum, iron, stainless steel, and steel with these versatile wheels. Their aluminum oxide abrasive stays sharp across a wide range of metals for consistent performance and long wheel life. Fiberglass mesh reinforcement resists breakage during high-speed use. The Type 1 straight design fits standard floor-mount chop saws and cutoff machines.

Warning: Use wheels that have a greater rpm rating than the no-load rpm of your tool.

					Grinding Wheel		Material
	Thk.	Arbor Hole Size	Arbor Hole Shape	Max. Rotation Speed, rpm	Designation	Shape	Abrasive	Reinforcement	For Use On	Grit		Each
20" Diameter



		3/16"	1"	Round	3,065	Type 1	Straight	Aluminum Oxide	Fiberglass Mesh	Aluminum, Iron, Stainless Steel, Steel	30	4173A16	000000

Long-Life Floor-Mount Cutoff Saw Wheels for Metal


	Side View

Two layers of fiberglass mesh reinforcement give these fast-cutting, zirconia alumina wheels at least three times the life of standard cutoff wheels when cutting aluminum, iron, stainless steel, and steel. They are not for use on hand-held saws.

Warning: Use wheels that have a greater rpm rating than the no-load rpm of your tool.

					Grinding Wheel		Material
	Thk.	Arbor Hole Size	Arbor Hole Shape	Max. Rotation Speed, rpm	Designation	Shape	Abrasive	Reinforcement	For Use On	Grit		Each
20" Diameter



		5/32"	1"	Round	2,710	Type 1	Straight	Zirconia Alumina	Fiberglass Mesh	Aluminum, Iron, Stainless Steel, Steel	24	4173A49	0000000

Floor-Mount Cutoff Saw Wheels for Ductile Iron


	Side View

Zirconia alumina abrasive stays sharp longer than aluminum oxide when cutting tough ductile iron. Fiberglass mesh reinforcement resists wheel breakage during heavy cuts on floor-mount saws. These wheels are not for use on hand-held saws.

Warning: Use wheels that have a greater rpm rating than the no-load rpm of your tool.

					Grinding Wheel		Material
	Thk.	Arbor Hole Size	Arbor Hole Shape	Max. Rotation Speed, rpm	Designation	Shape	Abrasive	Reinforcement	For Use On	Grit		Each
20" Diameter



		3/16"	1"	Round	3,800	Type 1	Straight	Zirconia Alumina	Fiberglass Mesh	Ductile Iron	24	4173A81	000000

Adhesive-Back Sanding Discs

Press these discs onto sanding tools or backup pads for a hold that won’t slip. To ensure the best bond, clean the pad with a mild alcohol—avoid harsh solvents such as MEK and acetone that can damage the adhesive. Also known as PSA discs.

Cloth Abrasive Backing—Resist tearing and hold up to wet sanding better than paper-backed discs.

Aluminum Oxide Abrasive—The most versatile and affordable abrasive we offer. Aluminum oxide is the go-to choice for general purpose sanding.

Zirconia Alumina Abrasive—A step up from aluminum oxide. Zirconia alumina's tough grains remove material faster and last longer but require heavy pressure to cut properly.

Grit—The lower the grit number, the rougher the finish and the duller the appearance. The higher the grit number, the more polished the finish and the more satin or mirrored the appearance.

	For Use With	Choose a Grit	Pkg. Qty.		Pkg.
Aluminum Oxide Abrasive







	For Rough Finish

	20"	Cloth	Steel, Wood	Stationary Disc Sanders	36, 40, 50, 60, 80	5	4700A841	000000




			For Smooth Finish

			20"	Cloth	Steel, Wood	Stationary Disc Sanders	100, 120, 180, 220	5	4700A842	00000




					For Extra-Smooth Finish

					20"	Cloth	Steel, Wood	Stationary Disc Sanders	240, 320, 400	5	4700A843	00000


					Zirconia Alumina Abrasive







									For Rough Finish

									20"	Cloth	Steel, Wood	Stationary Disc Sanders	36, 40, 50, 60, 80	1	47125A794	00000




											For Smooth Finish

											20"	Cloth	Steel, Wood	Stationary Disc Sanders	120	1	47125A89	00000

Clog-Resistant Adhesive-Back Sanding Discs

Spend more time sanding and less time replacing clogged discs. A slick coating prevents dust and debris buildup on the abrasive surface. Press these discs onto sanding tools or backup pads for a hold that won’t slip. To ensure the best bond, clean the pad with a mild alcohol—avoid harsh solvents such as MEK and acetone that can damage the adhesive. Also known as PSA discs.

Cloth Abrasive Backing—Resist tearing and hold up to wet sanding better than paper-backed discs.

Aluminum Oxide Abrasive—The most versatile and affordable abrasive we offer. Aluminum oxide is the go-to choice for general purpose sanding.

Grit—The lower the grit number, the rougher the finish and the duller the appearance. The higher the grit number, the more polished the finish and the more satin or mirrored the appearance.

	For Use With	Choose a Grit	Pkg. Qty.		Pkg.
Aluminum Oxide Abrasive







	For Rough Finish

	20"	Cloth	Steel, Wood	Stationary Disc Sanders	40, 60, 80	1	4675A891	000000




			For Smooth Finish

			20"	Cloth	Steel, Wood	Stationary Disc Sanders	100, 120, 180	1	4675A892	00000

Adhesive-Back Sanding Discs for Soft Metals, Plastic, and Rubber

Prevent clogging and smearing when sanding soft materials. The abrasive won’t trap particles, so these discs stay sharp longer. Press them onto sanding tools or backup pads for a hold that won’t slip. To ensure the best bond, clean the pad with a mild alcohol—avoid harsh solvents such as MEK and acetone that can damage the adhesive. Also known as PSA discs.

Synthetic Paper Abrasive Backing—Waterproof to resist deterioration and curling when used for wet sanding.

Silicon Carbide Abrasive—Super sharp to cut quickly under light pressure. Silicon carbide is hard but brittle, so it tends to wear out sooner than other abrasives.

Grit—The lower the grit number, the rougher the finish and the duller the appearance. The higher the grit number, the more polished the finish and the more satin or mirrored the appearance.

	For Use With	Grit	Pkg. Qty.		Pkg.
Silicon Carbide Abrasive







	For Rough Finish

	20"	Synthetic Paper	Aluminum, Brass, Bronze, Copper, Plastic, Rubber	Stationary Disc Sanders	60	5	47185A81	000000


	20"	Synthetic Paper	Aluminum, Brass, Bronze, Copper, Plastic, Rubber	Stationary Disc Sanders	80	5	47185A82	00000




			For Smooth Finish

			20"	Synthetic Paper	Aluminum, Brass, Bronze, Copper, Plastic, Rubber	Stationary Disc Sanders	120	5	47185A83	00000


			20"	Synthetic Paper	Aluminum, Brass, Bronze, Copper, Plastic, Rubber	Stationary Disc Sanders	180	5	47185A84	00000




					For Extra-Smooth Finish

					20"	Synthetic Paper	Aluminum, Brass, Bronze, Copper, Plastic, Rubber	Stationary Disc Sanders	240	5	47185A85	00000


					20"	Synthetic Paper	Aluminum, Brass, Bronze, Copper, Plastic, Rubber	Stationary Disc Sanders	400	5	47185A86	00000




							For Polished Finish

							20"	Synthetic Paper	Aluminum, Brass, Bronze, Copper, Plastic, Rubber	Stationary Disc Sanders	600	5	47185A87	00000