A11 Grinding Bits | McMaster-Carr

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7 Products

Grinding Bits for Metals

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.

For technical drawings and 3-D models, click on a part number.

Barrel

	Head				Abrasive
	Dia.	Lg.	Max. Speed, rpm	Shape No.	Material	Bond Material	Shank Lg.	Choose a Grit (Surface Texture)	Pkg. Qty.		Pkg.
1/4" Shank Dia.
For Steel, Stainless Steel, Iron
4	7/8"	2"	19,860	A11	Aluminum Oxide	Vitrified Clay	1 1/2"	36 (Rough) Blue-Gray, 60 (Rough) Orange, 120 (Smooth) Blue	5	00000000	000000

Rubber-Cushioned Abrasive Grinding Bits for Metals

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.

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

Bits for aluminum, brass, and bronze are silicon carbide, which cuts through soft metals without generating much heat or causing material buildup.

For technical drawings and 3-D models, click on a part number.

	Head					Abrasive
	Dia.	Lg.	Max. Speed, rpm	Shape No.	Shape	Material	Bond Material	Shank Lg.	Choose a Grit (Surface Texture)		Each
For Steel
1/4" Shank Dia.
10	7/8"	2"	19,860	A11	Cone	Aluminum Oxide	Rubber	1 1/2"	46 (Rough) Brown, 70 (Smooth) Black, 120 (Smooth) Green, 180 (Smooth) Red	00000000	000000
For Aluminum, Brass, Bronze
1/4" Shank Dia.
10	7/8"	2"	19,860	A11	Cone	Silicon Carbide	Rubber	1 1/2"	46 (Rough) Brown, 90 (Smooth) Black, 120 (Smooth) Green, 240 (Extra Smooth) Red	00000000	00000

Grinding Bits for Stainless Steel

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.

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

For technical drawings and 3-D models, click on a part number.

	Head					Abrasive
	Dia.	Lg.	Max. Speed, rpm	Shape No.	Shape	Material	Bond Material	Shank Lg.	Grit (Surface Texture)		Each
For Stainless Steel
1/4" Shank Dia.
8	7/8"	2"	19,860	A11	Barrel	Aluminum Oxide	Vitrified Ceramic	1 1/2"	60 (Rough) Pink	00000000	00000
8	7/8"	2"	19,860	A11	Barrel	Zirconia Alumina	Synthetic Resin	1 1/2"	30 (Rough) Gray	00000000	0000

High-Performance Grinding Bits for Metals

Made of ceramic alumina, 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.

For technical drawings and 3-D models, click on a part number.

	Head					Abrasive
	Dia.	Lg.	Max. Speed, rpm	Shape No.	Shape	Material	Bond Material	Shank Lg.	Grit (Surface Texture)		Each
For Iron, Stainless Steel, Steel, Titanium
1/4" Shank Dia.
9	7/8"	2"	25,420	A11	Cone	Ceramic Alumina	Vitrified Clay	1 1/2"	80 (Smooth) Green	000000	00000

Cotton-Laminate Grinding Bits for Metals

Made of cotton fiber layers embedded with aluminum-oxide grains, these bits grind and finish in one step. They’re ideal for light deburring, blending, and finishing metal. These grinding bits remove material more efficiently than rubber-cushioned bits. While grinding, they resist the buildup of aluminum, brass, bronze, and other nonferrous metal. They’re also known as mounted points and die grinder bits. Head diameter is measured at the widest point.

For technical drawings and 3-D models, click on a part number.

	Head					Abrasive
	Dia.	Lg.	Max. Speed, rpm	Shape No.	Shape	Material	Bond Material	Shank Lg.	Grit (Surface Texture)		Each
For Steel, Stainless Steel, Aluminum, Brass, Copper, Iron, Nickel, Titanium
1/4" Shank Dia.
3	7/8"	2"	19,860	A11	Cone	Cotton Laminate/Aluminum Oxide Blend	Rubber	1 1/2"	80 (Smooth) Blue-Gray	00000000	000000