W189 Grinding Bits | McMaster-Carr

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For Use On

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Grit

Maximum Rotation Speed

Abrasive Material

Shape Number

Shank Length

Material

Rotation Speed

20,000 rpm to 29,999 rpm

Grit Rating

Extra Coarse

Coarse

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DFARS Specialty Metals

Exempt

Export Control Classification Number (ECCN)

REACH

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U.S.–Mexico–Canada Agreement (USMCA) Qualifying

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For Use With

Grinders for Bits and Burs

Abrasive Bond Material

4 Products

Grinding Bits for Metals

Style

Made of aluminum oxide, these bits are well suited for use on most metals and materials that are not heat sensitive.

Bits are also known as mounted points and die grinder bits. Head diameter is measured at the widest point.

Caution: As bit shank is exposed beyond _1/2", maximum safe rpm decreases significantly. Refer to ANSI standard B7.1. Use only accessories that have a greater rpm rating than the maximum speed of the grinder you choose.

Cylinder

Style

		Head				Abrasive
	Style	Dia.	Lg.	Max. Rotation Speed, rpm	Shape No.	Material	Bond Material	Shank Lg.	Choose a Grit (Surface Texture)	Pkg. Qty.		Pkg.
For Steel, Stainless Steel, and Iron







				1/4" Diameter Shank

				1	1/2"	2"	24,000	W189	Aluminum Oxide	Vitrified Clay	1 1/2"	46 (Rough) Blue-Gray, 60 (Rough) Orange, 120 (Smooth) Blue	5	4522A223	000000

High-Performance Grinding Bits for Metals

Style

Made of aluminum oxide ceramic, these bits prevent material and heat buildup better than bits made of boron nitride and aluminum oxide when used on steel, stainless steel, iron, and titanium. They also last longer than boron nitride bits, so they’re the best choice for high-volume applications. Also known as mounted points and die grinder bits.

Head diameter is measured at the widest point.

Cylinder

Style

		Head				Abrasive
	Style	Dia.	Lg.	Max. Rotation Speed, rpm	Shape No.	Material	Bond Material	Shank Lg.	Grit (Surface Texture)		Each
For Iron, Stainless Steel, Steel, and Titanium







				1/4" Diameter Shank

				2	1/2"	2"	26,830	W189	Ceramic Alumina	Vitrified Clay	1 1/2"	36 (Rough) Red	4775N25	00000

Rubber-Cushioned Abrasive Grinding Bits for Metals

Style

The abrasive grains in these bits are blended with rubber, which cushions during grinding to produce a smoother surface texture than other bits with similar grits. Bits are also known as mounted points and die grinder bits. Head diameter is measured at the widest point.

Cylinder

Style

For Steel—Bits for steel are aluminum oxide, which is the most common abrasive used in grinding metal.

		Head				Abrasive
	Style	Dia.	Lg.	Max. Rotation Speed, rpm	Shape No.	Material	Bond Material	Shank Lg.	Choose a Grit (Surface Texture)		Each
For Steel







				1/4" Diameter Shank

				1	1/2"	2"	24,000	W189	Aluminum Oxide	Rubber	1 1/2"	46 (Rough) Silver, 80 (Smooth) Silver	4919A221	000000

Grinding Bits for Stainless Steel

Style

Bits are specially formulated to stay cool during grinding, so they won’t mar or discolor stainless steel. They are also known as mounted points and die grinder bits. Head diameter is measured at the widest point.

Cylinder

Style

Zirconia Alumina Abrasive—Zirconia alumina bits grind faster and last longer than aluminum oxide bits.

		Head				Abrasive
	Style	Dia.	Lg.	Max. Rotation Speed, rpm	Shape No.	Material	Bond Material	Shank Lg.	Grit (Surface Texture)		Each
For Stainless Steel







				1/4" Diameter Shank

				1	1/2"	2"	24,000	W189	Zirconia Alumina	Synthetic Resin	1 1/2"	30 (Rough) Gray	44005A15	00000