Angle Grinder Arbors | McMaster-Carr

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4 1/2"

9 1/8"

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Backup Pad Mount Type

Arbor

Maximum Rotation Speed

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

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EAR99

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Material

Steel

Rotation Speed

Less than 10,000 rpm

10,000 rpm to 19,999 rpm

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Performance

Finish

Barrel Height

Base Diameter

Base Thickness

Arbor Hole Thread Pitch

46 Products

Cool-Sanding Backup Pads for Arbor-Mount Sanding Discs


Style A	Style B

These pads are designed to channel air flow to the sanding disc for cooler operation, prolonging the life of the disc. Install the backup pad onto the tool’s arbor, then attach a sanding disc and secure with a retaining nut.

Style A

Style A come with a separate plate that has a hole pattern to allow air flow.

Max. Rotation Speed, rpm	Arbor Hole Thread Size	Includes	For Use With		Each



7"	10,000	M14 × 2 mm	Retaining Nut, Plate	Angle Grinders	4395A25	000000

Style B

Style B have spiral ribs that form air-flow channels. Retaining nuts are sold separately.

					Flexible		Semi-Rigid		Rigid
For Disc Dia.	Max. Rotation Speed, rpm	Arbor Hole Size	Arbor Hole Thread Size	For Use With		Each		Each		Each



	4"	12,000	—	5/8"-11	Angle Grinders	4655A11	000000	4655A5	000000	4655A21	000000


	4 1/2"	11,000	5/8"	—	Angle Grinders	4655A17	00000	4655A7	00000	4655A33	00000
	5"	10,000	—	5/8"-11	Angle Grinders	4655A12	00000	4655A3	00000	4655A22	00000
	7"	7,000	—	5/8"-11	Angle Grinders	4655A16	00000	———	0	———	0
	7"	8,500	—	5/8"-11	Angle Grinders	———	0	4655A1	00000	4655A24	00000
	9"	6,500	—	5/8"-11	Angle Grinders	4655A15	00000	4655A2	00000	4655A26	00000

Accessories for Backup Pads

		Each
5/8"-11 Adapter for 3/8"-24 Grinder Spindle	4655A31	000000
5/8"-11 Adapter for 7/16"-20 Grinder Spindle	4655A32	00000
Retaining Nut for 4"-6" Disc Dia.	4655A27	0000
Retaining Nut for 7"-9" Disc Dia.	4655A28	0000

Backup Pad Retaining Nuts

Thread these nuts onto your tool’s arbor to hold a sanding disc against the backup pad. They're made for discs that have an unthreaded arbor hole.

	Retaining Nuts									Pin Spanner Wrenches
			Base		Barrel
	For Disc Dia. Range	Arbor Hole Thread Size	Dia.	Thick.	Dia.	Ht.	Through-Hole Dia.		Each		Each
Zinc-Plated Steel



		4"-6"	5/8"-11	1 11/16"	3/32"	7/8"	21/64"	17/32"	4655A27	00000	5481A11	000000


		7"-9"	5/8"-11	2"	5/64"	7/8"	11/32"	17/32"	4655A28	0000	5481A11	00000

Backup Pads for Arbor-Mount Sanding Discs

These backup pads provide a firm, flat surface that keeps arbor-mount sanding discs stable during grinding. A stable disc reduces gouging and delivers a more consistent finish.

Max. Rotation Speed, rpm	Arbor Hole Thread Size	Includes	For Use With		Each



4 1/2"	18,000	5/8"-11	Disc Nut	Angle Grinders	4728A29	000000


5"	18,000	5/8"-11	Disc Nut	Angle Grinders	4728A31	00000
7"	8,600	5/8"-11	Disc Nut	Angle Grinders	4728A42	00000
9", 9 1/8"	7,000	5/8"-11	Disc Nut	Angle Grinders	4728A43	00000

Grinder Spindle Adapters

		Each
5/8"-11 Adapter for M10 × 1.5 mm Grinder Spindle	4728A63	000000
5/8"-11 Adapter for 3/8"-24 Grinder Spindle	4655A31	00000

Arbor-Mount Backup Pads for Nylon Mesh Cushioned Hook and Loop Sanding Discs


Front	Soft

Back	Hard

Thread one of these pads onto the tool's arbor. Once the pad is secured, you can quickly attach, remove, and reuse hook and loop sanding discs.

Soft—Soft pads have a thicker layer of foam than hard pads, which conforms to contoured surfaces. They're also great for finishing work.

Hard—Hard pads are best for aggressive cutting on flat surfaces.

	Max. Rotation Speed, rpm	Arbor Hole Thread Size	For Use With		Each
Soft



	4 1/2"	6,000	5/8"-11	Angle Grinders	46595A101	000000


	5"	6,000	5/8"-11	Angle Grinders	46595A102	00000
	6"	6,000	5/8"-11	Angle Grinders	46595A103	00000
	7"	6,000	5/8"-11	Angle Grinders	46595A104	00000


	Hard



			4 1/2"	10,000	5/8"-11	Angle Grinders	46595A43	00000


			5"	8,000	5/8"-11	Angle Grinders	46595A37	00000
			6"	8,000	5/8"-11	Angle Grinders	46595A38	00000
			7"	6,000	5/8"-11	Angle Grinders	46595A41	00000
			8"	6,000	5/8"-11	Angle Grinders	46595A42	00000

Makita Backup Pads for Arbor-Mount Sanding Discs

Designed for use with Makita grinders and sanders, these backup pads provide a firm, flat surface that supports arbor-mount sanding discs for consistent contact and even material removal.

Max. Rotation Speed, rpm	Arbor Hole Thread Size	Includes	For Use With		Each



4"	11,500	M10 × 1.25 mm	Disc Nut	Angle Grinders	8721A22	000000


4 1/2"	11,500	5/8"-11	Disc Nut	Angle Grinders	8721A32	00000
5"	11,500	5/8"-11	Disc Nut	Angle Grinders	8721A402	00000

See-Through Backup Pads for Arbor-Mount Sanding Discs

Holes in these pads align with holes in the sanding disc for a clearer view of the sanding surface. Thread the backup pad onto the tool’s arbor, then attach a sanding disc and secure with the disc nut.

Max. Rotation Speed, rpm	Arbor Hole Thread Size	Includes	For Use With		Each



4 1/2"	13,000	5/8"-11	Disc Nut	Angle Grinders	46795A24	000000


5"	13,000	5/8"-11	Disc Nut	Angle Grinders	46795A25	00000

Disc-Cleaning Backup Pads for Arbor-Mount Sanding Discs


Backup Pads for 5" Disc Diameter	Backup Pads for 7" and 9" Disc Diameter

With a free-spinning hub, these pads rotate independently while their raised ribs graze the back of the disc to clear debris and prolong the disc's life. Mount the backup pad to your tool’s arbor, then attach the sanding disc and secure with a nut.

For 7" Diameter Disc and For 9" Diameter Disc—Pads for 7" and 9" disc diameter have a scalloped edge that applies less pressure on the work surface, reducing operator effort.

	Max. Rotation Speed, rpm	Arbor Hole Thread Size	Edge Shape		Each
Backup Pads



	5"	11,000	5/8"-11	Round	7867N13	000000


	7"	8,600	5/8"-11	Scallop	7867N14	00000
	9"	8,600	5/8"-11	Scallop	7867N15	00000


	Backup Pads with Plate and Disc Nut



			5"	11,000	5/8"-11	Round	7867N11	00000


			7"	8,600	5/8"-11	Scallop	7867N12	00000
			9"	8,600	5/8"-11	Scallop	4395A24	00000