Round Abrasive Files | McMaster-Carr

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92 Products

About Polishing Stones and Bobs

Match grit size and micron ratings to the texture, appearance, and flatness you need to achieve.

Clog-Resistant Polishing Stones for Steel

No need to stop and clean these stones as you polish—they’re filled with oil to keep debris from getting stuck in the pores. Use a holder to polish by hand or with a power tool (both sold separately). You’ll also need a water-soluble or oil-based lubricant to wash away debris and reduce friction and heat on your workpiece.

Straight Round

Aluminum Oxide Abrasive—Aluminum oxide stones, also known as India stones, scrape away material slowly to give you more control over how much material you take off. They are good for the final stage of polishing.

Silicon Carbide Abrasive—Silicon carbide stones, also known as Crystolon stones, are extremely sharp. These stones remove material more quickly than aluminum oxide stones. They are best for the early polishing stage when you want to clear away more material from your work surface. However, they give you less control over material removal than aluminum oxide stones, so stopping at an exact point is more difficult to do.

	Lubrication		Each
Aluminum Oxide—For Steel







	100 Grit (For Smooth Finish)

	4"	1/4"	Gray	Lubricated, Required	4499A13	000000


	4"	3/8"	Gray	Lubricated, Required	4499A33	00000
	4"	1/2"	Gray	Lubricated, Required	4499A43	00000
	6"	1/2"	Gray	Lubricated, Required	4499A53	00000
	6"	3/4"	Gray	Lubricated, Required	4499A63	00000
	6"	1"	Gray	Lubricated, Required	4499A73	00000




			240 Grit (For Extra-Smooth Finish)

			4"	1/4"	Brown	Lubricated, Required	4499A12	00000


			4"	3/8"	Brown	Lubricated, Required	4499A32	00000
			4"	1/2"	Brown	Lubricated, Required	4499A42	00000
			6"	1/2"	Brown	Lubricated, Required	4499A52	00000
			6"	3/4"	Brown	Lubricated, Required	4499A62	00000
			6"	1"	Brown	Lubricated, Required	4499A72	00000




					320 Grit (For Extra-Smooth Finish)

					4"	1/4"	Orange	Lubricated, Required	4499A11	00000


					4"	3/8"	Orange	Lubricated, Required	4499A31	00000
					4"	1/2"	Orange	Lubricated, Required	4499A41	00000
					6"	1/2"	Orange	Lubricated, Required	4499A51	00000
					6"	3/4"	Orange	Lubricated, Required	4499A61	00000
					6"	1"	Orange	Lubricated, Required	4499A71	00000


					Silicon Carbide—For Steel







									150 Grit (For Smooth Finish)

									4"	1/4"	Gray	Lubricated, Required	4347A42	00000




											280 Grit (For Extra-Smooth Finish)

4"											1/4"	Black	Lubricated, Required	4347A41	00000

Hand-Held Stone Holders

For No. of Stones	For Stone Diameter		Each
2	1/4", 3/8"	47465A102	00000

Straight Half-Round

	Color	Lubrication		Each
Aluminum Oxide—For Steel







	100 Grit (For Smooth Finish)

	4"	1/4"	9/64"	Gray	Lubricated, Required	4500A13	000000


	4"	5/16"	5/32"	Gray	Lubricated, Required	4500A23	00000
	4"	3/8"	13/64"	Gray	Lubricated, Required	4500A33	00000
	4"	1/2"	1/4"	Gray	Lubricated, Required	4500A43	00000




			240 Grit (For Extra-Smooth Finish)

			4"	1/4"	9/64"	Brown	Lubricated, Required	4500A12	00000


			4"	5/16"	5/32"	Brown	Lubricated, Required	4500A22	00000
			4"	3/8"	13/64"	Brown	Lubricated, Required	4500A32	00000
			4"	1/2"	1/4"	Brown	Lubricated, Required	4500A42	00000




					320 Grit (For Extra-Smooth Finish)

					4"	1/4"	9/64"	Orange	Lubricated, Required	4500A11	00000


					4"	5/16"	5/32"	Orange	Lubricated, Required	4500A21	00000
					4"	3/8"	13/64"	Orange	Lubricated, Required	4500A31	00000
					4"	1/2"	1/4"	Orange	Lubricated, Required	4500A41	00000

Straight Contoured

	Color	Lubrication		Each
Aluminum Oxide—For Steel







	100 Grit (For Smooth Finish)

	4"	7/16"	1/8" to 3/16"	Brown	Lubricated, Required	4507A33	000000




			240 Grit (For Extra-Smooth Finish)

			4"	7/16"	1/8" to 3/16"	Brown	Lubricated, Required	4507A32	00000




					320 Grit (For Extra-Smooth Finish)

					4"	7/16"	1/8" to 3/16"	Orange	Lubricated, Required	4507A31	00000

Tapered Round

	Lubrication		Each
Aluminum Oxide—For Steel







	100 Grit (For Smooth Finish)

	4"	1/4" to 1/2"	Gray	Lubricated, Required	8742A13	000000




			240 Grit (For Extra-Smooth Finish)

			4"	1/4" to 1/2"	Brown	Lubricated, Required	8742A12	00000




					320 Grit (For Extra-Smooth Finish)

					4"	1/4" to 1/2"	Orange	Lubricated, Required	8742A11	00000

Tapered Pointed

	Lubrication		Each
Aluminum Oxide—For Steel







	100 Grit (For Smooth Finish)

	3"	1/32" to 5/16"	Gray	Lubricated, Required	8743A13	000000




			240 Grit (For Extra-Smooth Finish)

			3"	1/32" to 5/16"	Brown	Lubricated, Required	8743A12	00000




					320 Grit (For Extra-Smooth Finish)

					3"	1/32" to 5/16"	Orange	Lubricated, Required	8743A11	00000

Tapered Oval

	Color	Lubrication		Each
Aluminum Oxide—For Steel







	100 Grit (For Smooth Finish)

	4"	3/16" to 1/2"	1/16" to 3/16"	Gray	Lubricated, Required	4507A6	000000




			240 Grit (For Extra-Smooth Finish)

			4"	3/16" to 1/2"	1/16" to 3/16"	Brown	Lubricated, Required	4507A5	00000




					320 Grit (For Extra-Smooth Finish)

					4"	3/16" to 1/2"	1/16" to 3/16"	Orange	Lubricated, Required	4507A7	00000

Tapered Wedge

	Color	Lubrication		Each
Aluminum Oxide—For Steel







	100 Grit (For Smooth Finish)

	4"	3/16" to 3/8"	1/16" to 1/8"	Gray	Lubricated, Required	4507A13	000000




			240 Grit (For Extra-Smooth Finish)

			4"	3/16" to 3/8"	1/16" to 1/8"	Brown	Lubricated, Required	4507A12	00000




					320 Grit (For Extra-Smooth Finish)

					4"	3/16" to 3/8"	1/16" to 1/8"	Orange	Lubricated, Required	4507A11	00000

Handheld Sharpening Stones

Grip by hand and sharpen tools at the angle you need.

Straight Oval Stone—For Curved and Serrated Blade Edges

Novaculite—Novaculite has extremely fine grains that cut very slowly for the most control over sharpening. Also known as Arkansas stones.

	Stone
	Lg.	Wd.	Stone Thickness	Grit (For Finish)	Lubrication		Each
Single Grit







				Novaculite

				4"	1/2"	3/16"	800 (Polished)	Required	4433A37	000000

Tapered Point Stone—For Fluted and Serrated Blade Edges

Novaculite—Novaculite has extremely fine grains that cut very slowly for the most control over sharpening. Also known as Arkansas stones.

	Stone
	Lg.	Dia.	Grit (For Finish)	Lubrication		Each
Single Grit







				Novaculite

				3"	1/32" to 5/16"	800 (Polished)	Required	4433A38	000000

Straight Round Stone—For Curved Blade Edges

Novaculite—Novaculite has extremely fine grains that cut very slowly for the most control over sharpening. Also known as Arkansas stones.

	Stone
	Lg.	Dia.	Grit (For Finish)	Lubrication		Each
Single Grit







				Novaculite

				4"	1/4"	800 (Polished)	Required	4433A31	000000


				6"	3/8"	800 (Polished)	Required	4433A32	00000
				6"	1/2"	800 (Polished)	Required	4433A33	00000

Detail Polishing Stone Assortments

Keep stones in different grits on hand to smooth ribs, slots, teeth, and other fine features. The stones in these assortments are thin enough to slip into hard-to-reach areas. Made of bonded ceramic, they’re harder and more wear resistant than aluminum oxide stones, but flexible enough not to crack under pressure. Pair these stones with a holder to polish by hand or with a power tool, such as an ultrasonic polisher. Some holders are sold separately. Apply a water-soluble or oil-based lubricant to help keep debris from building up on the surface.

Straight Round

	Includes	Color		Each
Ceramic—For Aluminum, Brass, Bronze, Copper, Iron, Nickel, Steel, Stainless Steel, and Titanium



	6	One 1/8" Dia. Hand-Held Stone Holder One each 180, 300, 600, 800, 1200-grit Stones—2" Lg. × 1/8" Dia.	Blue, Brown, Gold, Green, Red	9568N36	0000000

Hand-Held Stone Holders

For No. of Stones	For Stone Diameter		Each
1	1/8"	4805A33	00000

Detail Polishing Stones

Smooth ribs, slots, teeth, and other fine features—these stones are thin enough to slip into hard-to-reach areas. Made of bonded ceramic, they’re harder and more wear resistant than aluminum oxide stones, but flexible enough not to crack under pressure. Pair with a holder (sold separately) to polish by hand or with a power tool, such as an ultrasonic polisher. Apply a water-soluble or oil-based lubricant to help keep debris from building up on the surface.

Straight Round

Ceramic/Diamond Blend Abrasive—Ceramic/diamond stones have diamond particles spread throughout the ceramic to make them harder and sharper. They won’t wear out as quickly as plain ceramic stones when finishing hardened steel, carbide, and other extremely hard materials.

	Dia.		Each
Ceramic—For Aluminum, Brass, Bronze, Copper, Iron, Nickel, Steel, Stainless Steel, and Titanium







		80 Grit (For Smooth Finish)

		1/8"	2"	Purple	4805A21	000000




				120 Grit (For Smooth Finish)

				1/8"	2"	Green	47465A724	00000




						180 Grit (For Smooth Finish)

						1/8"	2"	Gold	4805A171	00000




								240 Grit (For Extra-Smooth Finish)

								1/8"	2"	Brown	4805A173	00000




										400 Grit (For Extra-Smooth Finish)

										1/8"	2"	Orange	4805A181	00000




												600 Grit (For Polished Finish)

												1/8"	2"	Black	47465A725	00000




														800 Grit (For Polished Finish)

														1/8"	2"	Blue	4805A182	00000




																1000 Grit (For Polished Finish)

																1/8"	2"	White	4805A183	00000




																		1200 Grit (For Polished Finish)

1/8"	2"																	Red	47465A726	00000


Ceramic/Diamond Blend—For Carbide, Iron, Nickel, Steel, Stainless Steel, Titanium, and Hardened Steel







																		180 Grit (For Smooth Finish)

		1/8"	2"															Black	9567N24	00000




				400 Grit (For Extra-Smooth Finish)

				1/8"	2"													Gray	9567N25	00000




																		600 Grit (For Polished Finish)

						1/8"	2"											Green	9567N26	00000




																		800 Grit (For Polished Finish)

								1/8"	2"									Blue	9567N27	00000

Accessories for Stones

For No. of Stones	For Stone Diameter		Each
1	1/8"	4805A33	00000

Thread Size		Each
M6 × 0.75 mm	9657N52	000000

Polishing Stones for Steel

Just the right hardness level for polishing steel tools, molds, and dies. These stones also double as a good choice for general polishing. Choose the stone shape that best matches the contour of your work surface. These stones can be used by hand or in a power tool with a holder (both sold separately). To keep debris from building up, apply a water-soluble or oil-based lubricant during use.

Straight Round

	Lg.	Dia.	Color	Lubrication		Each
Aluminum Oxide—For Steel







				100 Grit (For Smooth Finish)

				5 1/2"	1/4"	Gray	Required	47465A283	00000


				5 1/2"	3/8"	Gray	Required	47465A284	0000
				5 1/2"	1/2"	Gray	Required	47465A285	00000




						220 Grit (For Smooth Finish)

						5 1/2"	1/4"	Gray	Required	47465A288	0000


						5 1/2"	3/8"	Gray	Required	47465A289	0000
						5 1/2"	1/2"	Gray	Required	47465A291	00000




								320 Grit (For Extra-Smooth Finish)

								5 1/2"	1/4"	Gray	Required	47465A294	0000


								5 1/2"	3/8"	Gray	Required	47465A295	0000
								5 1/2"	1/2"	Gray	Required	47465A296	00000


								Silicon Carbide—For Steel







												100 Grit (For Smooth Finish)

												6"	1/4"	Black	Required	47465A241	0000




														150 Grit (For Smooth Finish)

														4"	3/8"	Gray	Required	4347A44	00000


														4"	1/2"	Gray	Required	4347A46	00000
														6"	1/4"	Black	Required	47465A242	0000




220 Grit (For Smooth Finish)

6"	1/4"															Black	Required	47465A243	0000




		280 Grit (For Extra-Smooth Finish)

		4"	3/8"													Black	Required	4347A43	00000


		4"	1/2"													Black	Required	4347A45	00000




																320 Grit (For Extra-Smooth Finish)

				6"	1/4"											Black	Required	47465A244	0000




																400 Grit (For Extra-Smooth Finish)

																6"	1/4"	Black	Required	47465A245	0000




																600 Grit (For Polished Finish)

																6"	1/4"	Black	Required	47465A246	0000

Hand-Held Stone Holders

For No. of Stones	For Stone Diameter		Each
2	1/4", 3/8"	47465A102	00000

Polishing Stone Holders for Ultrasonic Polishers

For Round Stones

Secure stones in an ultrasonic polisher. These holders grip the stone without damaging it and keep it from shifting or slipping, allowing for precision work. Thread them into the handpiece of an ultrasonic polisher.

For Round Stones—Round stone holders require a hex wrench to tighten the holder around the stone. These holders can also be used with diamond files.

	For Stone
For Use With	Shape	Dia.	Thread Size	Thread Pitch, mm		Each
Diamond Files, Polishing Stones	Round	1/8"	M6	0.75	9657N52	000000

Handheld Polishing Stone Holders

For 1 Stone

For 2 Stones

Press your stone into these holders for controlled polishing. They’re more comfortable to hold than the stone on its own, and they keep your hand away from lubricant on your workpiece. Their press-fit mount makes it easy to swap stones in and out.

For 2 Stones—Holders for two stones make it easy to switch between stones of different shapes, materials, or grits.

		For Stone
	For No. of Stones	Shape	Wd. × Thk.	Dia.		Each
Press Fit



		1	Round	—	1/8"	4805A33	00000


		2	Round	—	1/4", 3/8"	47465A102	0000
		2	Round and Square	1/8" × 1/8" 5/32" × 5/32" 1/4" × 1/4"	1/8", 1/4"	47465A106	00000

Sharpening Stone Sets

Keep multiple shapes of sharpening stones on hand for sharpening a range of tools and blades. Use these sharpening stones with a water-soluble or oil-based lubricant.

Novaculite—Novaculite has extremely fine grains that cut very slowly for the most control over sharpening. Also known as Arkansas stones.

Ceramic Alumina—Extremely hard and wear resistant, these stones sharpen your hardest blades. They cut hard materials slower than cubic boron nitride (CBN) and diamond for finer control.

	Includes	Lubrication	Container Type		Each
Novaculite



	4	One Straight Knife 1000-Grit (Polished) Stone for Fluted and Serrated Blade Edges—29/32" Wd. × 1/8"-1/4" Thick. One Straight Round 1000-Grit (Polished) Stone for Curved Blade Edges—1/4" Dia. One Straight Square 1000-Grit (Polished) Stone for Straight Blade Edges—1/4" Wd. × 1/4" Thick. One Straight Triangular 1000-Grit (Polished) Stone for Straight and Serrated Blade Edges—1/4" Wd.	Required	Box	4433A41	000000


	4	One Straight Knife 1000-Grit (Polished) Stone for Fluted and Serrated Blade Edges—29/32" Wd. × 1/8"-3/8" Thick. One Straight Round 1000-Grit (Polished) Stone for Curved Blade Edges—3/8" Dia. One Straight Square 1000-Grit (Polished) Stone for Straight Blade Edges—3/8" Wd. × 3/8" Thick. One Straight Triangular 1000-Grit (Polished) Stone for Straight and Serrated Blade Edges—3/8" Wd.	Required	Box	4433A42	000000


	Ceramic Alumina



			4	One Straight Contoured 1400-Grit (Polished) Stone for Fluted and Serrated Blade Edges—15/32" Wd. × 1/8"-1/4" Thick. One Straight Round 1400-Grit (Polished) Stone for Curved Blade Edges—1/4" Dia. One Straight Square 1400-Grit (Polished) Stone for Straight Blade Edges—1/4" Wd. × 1/4" Thick. One Straight Triangular 1400-Grit (Polished) Stone for Straight and Serrated Blade Edges—1/4" Wd.	Required	Sheath	4456A17	00000