Grinder Nuts | McMaster-Carr

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82 Products

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

Electric Angle Grinders for Grinding Wheels and Sanding Discs

The threaded spindles on these grinders accept raised-hub grinding wheels. Grinders have a spindle lock for fast wheel changes and a side handle.

Match replacement parts to the manufacturer, model number, and type of your grinder, all of which are listed on the tool's label.

Caution: Use only accessories that have a greater rpm rating than the maximum speed of the grinder you choose.

DeWalt

Image of Product. Front orientation. Angle Grinders. Electric Angle Grinders for Grinding Wheels and Sanding Discs.

For Wheel Dia.	Max. Rotation Speed, rpm	For Arbor Hole Thread Size	Voltage, V AC	Current, amp	Switch Type	Speed Control Type	Overall Lg.	Wt., lb.	Certification	Mfr. Model No.		Each
4 1/2"	11,000	5/8"-11	120	11	Paddle	Fixed	12"	4.625	UL Listed, CSA Certified	DWE402	8705A19	0000000
4 1/2"	11,000	5/8"-11	120	11	Slide	Fixed	12"	4.625	UL Listed, CSA Certified	DWE4214	8705A64	000000
5"	11,000	5/8"-11	120	12	Trigger	—	14"	7.5	UL Listed, CSA Certified	DW831	8705A65	000000
6"	9,000	5/8"-11	120	13	Paddle	Fixed	13"	6.25	UL Listed, CSA Certified	DWE43144N	8705A88	000000

Accessories and Replacements for Angle Grinders

Pads

Backup pads are required when using sanding discs. Thread the backup pad onto the tool's arbor, then attach a sanding disc and secure with its disc nut.

For Disc Dia.	Max. Rotation Speed, rpm	Arbor Hole Thread Size	Includes		Each
4 1/2"	18,000	5/8"-11	Disc Nut	4728A29	000000
5"	18,000	5/8"-11	Disc Nut	4728A31	00000

Angle Grinder Wheel Guards

Wheel guards are required when using grinding wheels and cups.

	For Grinding Wheel
	Dia.	Designation	Form	For Mfr. Model No.		Each
For DeWalt Grinders



		4"	Type 11	—	DWE402, DWE4214	8705A101	000000


		4 1/2"	Type 1	—	DWE402, DWE4214	8705A32	00000
		4 1/2"	Type 27	—	DWE402, DWE4214	8705A28	0000
		4 1/2"	Type 27	Flap Disc	DWE402, DWE4214	8705A29	00000
		5"	Type 1	—	DW831	8705A35	00000
		5"	Type 1	—	DWE402, DWE43114	8705A34	00000
		5"	Type 27	—	DWE402	8705A33	0000
		6"	Type 1	—	DWE43144	8705A38	00000
		6"	Type 27	—	DWE43144	8705A37	0000

	For Mfr. Model No.
For DeWalt Grinders


DW831	8705A27	000000
DWE402, DWE4214, DWE43114, DWE43144	8705A26	0000

	For Mfr. Model No.	For Grinding Wheel Designation
For DeWalt Grinders


DW831	Type 5	8705A887	000000
DWE402	—	8705A885	00000
DWE4214	Type 3, Type 4	8705A889	00000
DWE43114, DWE43144	—	8705A89	00000

Flange Nuts

	For Grinding Wheel Designation		Each
For DeWalt Grinders



	DW831	Type 1	8705A882	00000


	DW831	Type 2	8705A883	0000
	DW831	Type 3, Type 4	8705A15	0000
	DW831, DWE402, DWE4214, DWE43114, DWE43144	Type 5	8705A881	0000

	For Mfr. Model No.	For Grinding Wheel Designation
For DeWalt Grinders


DW831	Type 1, Type 2, Type 3, Type 4, Type 5	8705A894	00000
DWE402, DWE4214, DWE43114, DWE43144	—	8705A892	0000

Milwaukee

Milwaukee grinders have a spindle lock for fast wheel changes.

OSHA Compliant 29 CFR 1910.215 and OSHA Compliant 29 CFR 1926.303—Grinders that meet OSHA 29 CFR 1910.215 and OSHA 29 CFR 1926.303 are compliant with standards for abrasive wheels.

OSHA Compliant 29 CFR 1910.243—Grinders that meet OSHA 29 CFR 1910.243 are compliant with standards for hand-held equipment.

For Wheel Dia.	Max. Rotation Speed, rpm	For Arbor Hole Thread Size	Voltage, V AC	Current, amp	Switch Type	Speed Control Type	Overall Lg.	Wt., lb.	Specs. Met	Certification	Mfr. Model No.		Each
4 1/2"	12,000	5/8"-11	120	11	Paddle	Fixed	14"	5.5	OSHA Compliant 29 CFR 1910.215, OSHA Compliant 29 CFR 1910.243, OSHA Compliant 29 CFR 1926.303	UL Listed, C-UL Listed, CSA Certified	6142-31	46225A24	0000000
7" 9"	6,500	5/8"-11	120	15	Trigger	Fixed	21"	13.75	OSHA Compliant 29 CFR 1910.215, OSHA Compliant 29 CFR 1910.243, OSHA Compliant 29 CFR 1926.303	UL Listed, C-UL Listed, CSA Certified	6088-30	46305A14	000000

Accessories and Replacements for Angle Grinders

Pads

Backup pads are required when using sanding discs. Thread the backup pad onto the tool's arbor, then attach a sanding disc and secure with its disc nut.

For Disc Dia.	Max. Rotation Speed, rpm	Arbor Hole Thread Size	Includes		Each
4 1/2"	18,000	5/8"-11	Disc Nut	4728A29	000000
7"	8,600	5/8"-11	Disc Nut	4728A42	00000
9", 9 1/8"	7,000	5/8"-11	Disc Nut	4728A43	00000

Angle Grinder Wheel Guards

Wheel guards are required when using grinding wheels and cups.

	For Grinding Wheel
	Dia.	Designation	For Mfr. Model No.		Each
For Milwaukee Grinders



		4 1/2"	Type 1	6142-31	46225A77	000000


		4 1/2"	Type 27	6142-31	46225A767	00000
		7"	Type 27	6088-30	46305A23	00000

For Wheel Dia.	For Arbor Hole Thread Size	For Wheel Thk.	Includes	Sold As		Each
6" to 9"	5/8"-11	1/16" to 1/4"	Flange, Hex Key, Mounting Nut	Set	46225A22	000000

	For Mfr. Model No.
For Milwaukee Grinders


6088-30	46225A763	000000
6142-31	46225A761	00000

	For Mfr. Model No.
For Milwaukee Grinders


6088-30	46225A104	000000
6142-31	46225A102	00000

	For Mfr. Model No.
For Milwaukee Grinders


6117-30, 6140-30, 6142-31	46225A91	00000
6088-30	46225A86	0000

	For Mfr. Model No.
For Milwaukee Grinders


6117-30, 6142-31	46225A765	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

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 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

Collets for Electric Bit and Bur Die Grinders

Ensure proper bit retention and minimize runout for precision grinding at high speeds. These OEM collets match the exact specifications of the original part for each grinder brand. Select by your grinder manufacturer and model.

	Mfr. Model No.	For Mfr. Model No.		Each
For Milwaukee



	1/8"	48-66-2486	5192, 5194, 5196	4375A29	000000

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

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

Cordless Angle Grinders for Grinding Wheels and Sanding Discs

With no cord to limit mobility, you can take these battery-powered grinders wherever they’re needed.

The included type 27 wheel guards are required when using grinding wheels and cups. Backup pads (not included) are required when using sanding discs. Thread the backup pad onto the tool's arbor, then attach a sanding disc and secure with its disc nut.

Caution: Use only accessories that have a greater rpm rating than the maximum speed of the grinder you choose.

Milwaukee—Milwaukee grinders have a spindle lock for fast wheel changes.

OSHA Compliant 29 CFR 1910.215 and OSHA Compliant 29 CFR 1926.303—Grinders that meet OSHA 29 CFR 1910.215 and OSHA 29 CFR 1926.303 are compliant with standards for abrasive wheels.

OSHA Compliant 29 CFR 1910.243—Grinders that meet OSHA 29 CFR 1910.243 are compliant with standards for hand-held equipment.

Batteries—For many batteries, recycling or other proper disposal is required by law. Do not dispose of batteries in the trash. For recycling drop-off locations visit www.batterynetwork.org/locator or call 1-877-2-RECYCLE.

	Angle Grinders														Batteries
	For Wheel Dia.	Max. Rotation Speed, rpm	For Arbor Hole Thread Size	Voltage, V DC	Batteries Included	Switch Type	Speed Control Type	Overall Lg.	Wt., lb.	Specs. Met	Certification	Includes		Each	Pkg. Qty.		Pkg.
Lithium Ion (Li-Ion) Battery







				Milwaukee 2881-20

				4 1/2" 5"	8,500	5/8"-11	18	No	Paddle	Fixed	12 3/4"	5.5	OSHA Compliant 29 CFR 1910.215, OSHA Compliant 29 CFR 1910.243, OSHA Compliant 29 CFR 1926.303	UL Listed, C-UL Listed, CSA Certified	Flange, Side Handle, Spindle Lock, Wrench	4743N13	0000000	1	29735A312	0000000

Accessories for Angle Grinders

Pads

Backup pads are required when using sanding discs. Thread the backup pad onto the tool's arbor, then attach a sanding disc and secure with its disc nut.

For Disc Dia.	Max. Rotation Speed, rpm	Arbor Hole Thread Size	Includes		Each
5"	18,000	5/8"-11	Disc Nut	4728A31	000000

Angle Grinder Wheel Guards

Wheel guards are required when using grinding wheels and cups.

	For Grinding Wheel
	Dia.	Designation	For Mfr. Model No.		Each
For Milwaukee Grinders



		4 1/2" 5"	Type 27	2881-20	46225A772	00000


		5"	Type 1	2881-20, 6117-30	46225A771	00000