Round Sharpening Stones | McMaster-Carr

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19 Products

Sharpening Stones

Sharpen tools on your bench top. Use these sharpening stones with a water-soluble or oil-based lubricant.

Straight Round Stone—For Straight Blade Edges

Two Grit—A different grit on each side enables two-step sharpening with one stone. First sharpen your blade with a lower grit, then sharpen again with a finer (higher) grit until the desired edge is achieved.

Aluminum Oxide Abrasive—Aluminum oxide cuts more slowly than silicon carbide for finer control. Also known as India stones.

Silicon Carbide Abrasive—Silicon carbide cuts quickly with light pressure. Also known as Crystolon stones.

Oil Filled—No need to stop and clean these stones as you polish—they’re filled with oil to keep debris from getting stuck in their pores. You’ll also need an oil-based lubricant to wash away debris and reduce friction and heat on your workpiece.

	Lubrication	Clog Resistance Method		Each
Two Grit







	Aluminum Oxide × Aluminum Oxide

	4"	1"	100 (Smooth) × 320 (Extra Smooth)	Required	Oil Filled × Oil Filled	4506A1	000000




			Silicon Carbide × Silicon Carbide

			4"	1"	100 (Smooth) × 280 (Extra Smooth)	Required	Oil Filled × Oil Filled	8739A11	00000


			4"	1"	120 (Smooth) × 280 (Extra Smooth)	Required	—	8739A22	00000

Handheld Sharpening Stones

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

Straight Round Stone—For Straight Blade Edges

Round Stone with Finger

Groove Shown in Use

Round Stone

Round Stone with Finger

Groove

Silicon Carbide Abrasive—Silicon carbide cuts quickly with light pressure. Also known as Crystolon stones.

Finger Groove—A groove in the center shields your fingers while you sharpen.

	Stone Color	Lubrication	Features		Each
Two Grit







	Silicon Carbide × Silicon Carbide

	3"	1"	120 (Smooth) × 280 (Extra Smooth)	Blue × Gray	Required	—	4474A5	00000


	4"	1 1/2"	120 (Smooth) × 280 (Extra Smooth)	Dark Gray × Gray	Required	Finger Groove	4474A4	00000

Straight Round Stone—For Curved and Serrated Blade Edges

Image of Product. Front orientation. ZoomedIn view. Sharpening Stones. Handheld Sharpening Stones, Straight Round 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.

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.

	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




						Ceramic Alumina

						5"	1/4"	1200 (Polished)	Required	4456A24	00000

Handheld Diamond Sharpening Stones


Style H	Style J

Hold these stones with one hand to sharpen your blade at any angle. Our hardest and longest-lasting abrasive, diamond quickly sharpens blades of any material. Use these stones dry or with water. Rinse with water to clean.

Without Dimples


Style H	Style J

The dimple-free surface sharpens blades evenly every time. Since these stones have the most abrasive, they also remove material more quickly. However, debris can build up rapidly, so you’ll need to wipe them clean more often.

Style J—Fold the sharpening end into the handle for compact storage.

			Stone
	Abrasive Grain Size	Grit (For Finish)	Lg.	Dia.	Lubrication	Overall Lg.	Handle Material		Each
Style H—Straight Round Stone for Curved and Serrated Blade Edges







				Single Grit

				11 μm	600 (Polished)	3 3/4"	1/4"	Not Required	8"	Brass	4353A11	000000


				Style J—Tapered Round Stone for Curved and Serrated Blade Edges







								Single Grit

								45 μm	240 (Extra Smooth)	4"	1/16" to 1/4"	Not Required	9 1/2"	Plastic	4353A15	00000


								25 μm	320 (Extra Smooth)	4"	1/16" to 1/4"	Not Required	9 1/2"	Plastic	4353A14	00000
								9 μm	600 (Polished)	4"	1/16" to 1/4"	Not Required	9 1/2"	Plastic	4353A31	00000

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

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

Pocket-Size Blade Sharpeners

Slip into your pocket or attach to a lanyard for sharpening on the go. Pass knife blades over the abrasive stones to restore dull edges.

For Sharpening Knives

2 Slots and 2 Stones

Carbide Abrasive—For coarse sharpening, carbide aggressively removes material to form a new edge.

Ceramic Abrasive—For use after coarse sharpening, ceramic refines and polishes your blade’s edge. You can also use ceramic to touch up blades that are still somewhat sharp.

Diamond Abrasive—Our hardest abrasive. Diamond can sharpen any blade material, even hardened steel.

Slots		Stones
No. of	Abrasive Material (Grit Rating)	No. of	Abrasive Material (Grit Rating)	Lg.	Wd.	Ht.		Each
2	For Straight-Blade Knives—Carbide (Coarse Grit) with Fixed Angle (22.5°) For Straight-Blade Knives—Ceramic (Fine Grit) with Fixed Angle (22.5°)	2	For Straight- and Serrated-Blade Knives—Tapered Round Diamond (Medium Grit) For Straight- and Serrated-Blade Knives—Rectangle Ceramic (Fine Grit)	4"	1/2"	1 1/4"	8669N11	000000

Sharpening Guides


2 Sharpening Angles	2 Sharpening Angles

Strike your sharpening stone with your blade at the correct angle for a razor-sharp edge—every time. These guides include multiple angle options. Use a lower angle for a sharper blade and a higher angle for a more durable blade.

2 Sharpening Angles—A wooden base holds the included sharpening stones at two different angles. Draw your blade down either stone to sharpen.

No. of Sharpening Angles	Sharpening Angle	Wd.	Lg.	Ht.	For Blade Edge	Material	Mount Type	Features	Includes		Each
2	20°, 25°	2"	6"	1"	Straight	Wood	Rest On	Storage for Four Stones	Two Straight Round 600-Grit (Polished) Ceramic Alumina Stones—5/16" Dia. × 5" Lg. Two Straight Round 1000-Grit (Polished) Ceramic Alumina Stones—5/16" Dia. × 5" Lg.	8642N11	000000