Chemical-Resistant Caps | McMaster-Carr

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137 Products

Round Caps

Cover pipe and rods to keep dust and coatings out of threads. These caps also prevent dents and nicks during shipping and storage. Push them onto just about any round object.

Rubber

Chemical-Resistant

EPDM

Chemical-Resistant EPDM—These caps won't swell or crack when masking parts during plating, anodizing, and other chemical finishing. They're flexible and conform for a tight fit.

	For OD	Inside Ht.	Flexibility	Max. Temp., ° F	Color	Pkg. Qty.		Pkg.
Chemical-Resistant EPDM



		0.02"	1/2"	Flexible	200	Black	100	00000000	000000


		0.034"	1/2"	Flexible	200	Black	100	00000000	00000
		3/64"	3/4"	Flexible	200	Black	100	0000000	00000
		1/16"	3/4"	Flexible	200	Black	100	00000000	00000
		5/64"	1"	Flexible	200	Black	50	0000000	0000
		3/32"	3/4"	Flexible	200	Black	50	0000000	0000
		0.1"	1/2"	Flexible	200	Black	50	0000000	0000
		7/64"	3/4"	Flexible	200	Black	50	0000000	0000
		1/8"	1/2"	Flexible	200	Black	50	00000000	0000
		1/8"	1"	Flexible	200	Black	50	0000000	0000
		9/64"	1/2"	Flexible	200	Black	50	00000000	0000


		9/64"	1"	Flexible	200	Black	50	0000000	0000
		5/32"	1"	Flexible	200	Black	50	0000000	0000
		11/64"	1/2"	Flexible	200	Black	50	00000000	0000
		11/64"	1"	Flexible	200	Black	50	0000000	00000
		3/16"	1/2"	Flexible	200	Black	50	00000000	0000
		3/16"	1"	Flexible	200	Black	50	0000000	00000
		7/32"	1"	Flexible	200	Black	50	0000000	0000
		0.223"	1"	Flexible	200	Black	50	0000000	0000
		15/64"	1"	Flexible	200	Black	50	0000000	00000
		15/64"	1 1/2"	Flexible	200	Black	50	00000000	00000


		1/4"	1"	Flexible	200	Black	50	0000000	00000
		9/32"	1"	Flexible	200	Black	50	0000000	0000
		19/64"	1"	Flexible	200	Black	50	00000000	00000
		19/64"	1 1/2"	Flexible	200	Black	50	00000000	00000
		5/16"	1"	Flexible	200	Black	50	0000000	00000
		11/32"	1"	Flexible	200	Black	50	0000000	00000
		0.355"	1 1/2"	Flexible	200	Black	50	0000000	00000
		3/8"	1"	Flexible	200	Black	25	0000000	0000
		3/8"	1 1/2"	Flexible	200	Black	25	00000000	00000
		13/32"	1"	Flexible	200	Black	25	0000000	0000


		7/16"	1"	Flexible	200	Black	25	0000000	0000
		0.456"	1 1/2"	Flexible	200	Black	25	0000000	0000
		15/32"	1"	Flexible	200	Black	10	0000000	0000
		1/2"	1 1/2"	Flexible	200	Black	25	0000000	00000
		0.535"	1 1/2"	Flexible	200	Black	50	0000000	00000
		9/16"	1 1/2"	Flexible	200	Black	25	0000000	00000
		5/8"	1 1/2"	Flexible	200	Black	50	0000000	00000
		11/16"	1 1/2"	Flexible	200	Black	10	0000000	0000
		3/4"	1 1/2"	Flexible	200	Black	10	0000000	0000
		13/16"	1 1/2"	Flexible	200	Black	25	0000000	00000


		7/8"	1 1/2"	Flexible	200	Black	10	0000000	0000
		15/16"	1 1/2"	Flexible	200	Black	10	0000000	0000
		1"	1 1/2"	Flexible	200	Black	10	0000000	0000
		1 1/16"	1 1/2"	Flexible	200	Black	10	0000000	0000
		1 1/8"	1 1/2"	Flexible	200	Black	5	0000000	0000
		1 3/16"	1 1/2"	Flexible	200	Black	5	0000000	0000
		1 1/4"	1 1/2"	Flexible	200	Black	5	0000000	0000
		1 3/8"	1 1/2"	Flexible	200	Black	5	0000000	0000
		1 1/2"	1 1/2"	Flexible	200	Black	5	0000000	0000
		1 5/8"	1 1/2"	Flexible	200	Black	5	0000000	0000

1 3/4"	2"	Flexible	200	Black	5	00000000	0000
1 7/8"	2"	Flexible	200	Black	5	00000000	00000
2"	2"	Flexible	200	Black	5	00000000	00000
2 1/2"	1 1/2"	Flexible	200	Black	5	00000000	00000
2 3/4"	1 1/2"	Flexible	200	Black	5	00000000	00000
3 1/2"	1 1/2"	Flexible	200	Black	1	00000000	0000
4"	1 3/4"	Flexible	200	Black	1	00000000	0000

Tapered Plugs

Chemical-Resistant

EPDM, 0 Holes

Don't worry about having the exact size you need on hand—these plugs are shaped to fit a range of diameters. Push in until they're snug to mask holes during coating and finishing.

Chemical-Resistant EPDM—These plugs won't degrade from exposure to cleaners, acids, and solvents.

					0 Holes
	For ID	Ht.	Max. Temp., ° F	Color	Pkg. Qty.		Pkg.
Chemical-Resistant EPDM



		3/64" to 1/16"	5/8"	300	Black	100	00000000	000000


		1/16" to 5/64"	5/8"	300	Black	100	0000000	00000
		5/64" to 1/8"	3/4"	300	Black	100	0000000	00000
		9/64" to 3/16"	3/4"	300	Black	50	0000000	00000
		13/64" to 9/32"	5/8"	300	Black	50	0000000	00000
		17/64" to 5/16"	3/4"	300	Black	25	0000000	00000
		17/64" to 3/8"	1"	300	Black	50	00000000	00000
		21/64" to 7/16"	7/8"	300	Black	25	0000000	0000
		33/64" to 19/32"	1"	300	Black	10	0000000	0000
		37/64" to 11/16"	1"	300	Black	10	0000000	0000
		41/64" to 23/32"	1"	300	Black	10	0000000	00000


		47/64" to 7/8"	1"	300	Black	10	0000000	00000
		51/64" to 15/16"	1"	300	Black	10	00000000	00000
		1 1/16" to 1 3/16"	1"	300	Black	10	00000000	00000
		1 7/32" to 1 3/8"	1"	300	Black	10	00000000	00000
		1 21/64" to 1 35/64"	1"	300	Black	10	00000000	00000
		1 1/2" to 1 11/16"	1"	300	Black	10	00000000	00000
		1 29/32" to 2 9/64"	1"	300	Black	5	00000000	00000
		2" to 2 13/32"	1"	300	Black	5	00000000	00000
		2 5/32" to 2 7/16"	1"	300	Black	5	00000000	00000
		2 15/32" to 2 57/64"	1 1/2"	300	Black	1	00000000	00000


		3 3/64" to 3 7/16"	1 1/2"	300	Black	1	00000000	00000
		3 19/64" to 3 15/16"	1 1/2"	300	Black	1	00000000	00000
		3 35/64" to 4 15/16"	2"	300	Black	1	00000000	00000
		4 3/64" to 4 15/16"	2"	300	Black	1	00000000	00000
		4 19/64" to 5 9/64"	2"	300	Black	1	00000000	00000
		4 51/64" to 5 47/64"	2 1/4"	300	Black	1	00000000	00000
		5 3/64" to 6 1/16"	2 1/2"	300	Black	1	00000000	00000

Pull-Through Plugs

Fill the entire length of through holes instead of plugging each end. Grip the small end of these plugs and pull through to mask holes during finishing. They’re also good for plugging multiple aligned holes at once.

Chemical-Resistant EPDM—These plugs won't swell or crack when masking parts during plating, anodizing, and other chemical finishing.

High-Temperature Silicone Rubber—Withstand multiple passes when paint baking, powder coating, and electroplating.

	For ID	Ht.	Tab Ht.	Max. Temp., ° F	Color	Pkg. Qty.		Pkg.
Chemical-Resistant EPDM



		1/16"	3/8"	11/32"	Not Rated	Black	100	0000000	000000


		1/16"	19/32"	19/32"	Not Rated	Black	100	0000000	00000
		1/16"	11/16"	11/16"	Not Rated	Black	50	0000000	00000
		3/32"	19/32"	17/32"	Not Rated	Black	10	0000000	0000
		1/8"	5/8"	5/8"	Not Rated	Black	10	0000000	0000
		1/8"	21/32"	11/16"	Not Rated	Black	50	0000000	00000
		5/32"	17/32"	5/8"	Not Rated	Black	10	0000000	0000
		5/32"	5/8"	5/8"	Not Rated	Black	50	0000000	00000
		3/16"	19/32"	5/8"	Not Rated	Black	10	0000000	0000
		3/16"	1"	1"	Not Rated	Black	50	0000000	00000
		7/32"	31/32"	1"	Not Rated	Black	10	0000000	0000


		1/4"	15/16"	15/16"	Not Rated	Black	50	0000000	00000
		1/4"	1"	1"	Not Rated	Black	50	0000000	00000
		5/16"	3/4"	1 3/32"	Not Rated	Black	50	0000000	00000
		11/32"	7/8"	15/16"	Not Rated	Black	50	0000000	00000
		3/8"	1"	1"	Not Rated	Black	25	0000000	00000
		13/32"	1"	1"	Not Rated	Black	25	0000000	00000
		7/16"	1"	1"	Not Rated	Black	25	0000000	00000
		15/32"	29/32"	1"	Not Rated	Black	10	0000000	0000
		15/32"	1"	1"	Not Rated	Black	10	0000000	0000
		1/2"	1"	31/32"	Not Rated	Black	10	0000000	00000


		1/2"	1"	1"	Not Rated	Black	10	0000000	00000
		19/32"	1"	1"	Not Rated	Black	10	0000000	0000
		5/8"	1"	1"	Not Rated	Black	10	0000000	00000
		11/16"	1 1/4"	1 5/16"	Not Rated	Black	10	0000000	00000
		23/32"	1 1/8"	1 1/8"	Not Rated	Black	10	0000000	00000
		3/4"	1"	15/16"	Not Rated	Black	10	0000000	00000
		25/32"	1 1/4"	1 1/4"	Not Rated	Black	10	0000000	00000
		7/8"	1"	1"	Not Rated	Black	10	0000000	00000
		1"	1"	31/32"	Not Rated	Black	10	0000000	00000


		High-Temperature Silicone Rubber



				1/16"	3/8"	5/16"	600	Clear	50	000000	0000


				1/16"	5/8"	9/16"	600	Green	50	000000	0000
				3/32"	11/16"	11/16"	600	Gray	25	000000	0000
				1/8"	21/32"	11/16"	600	Pink	25	000000	00000
				5/32"	5/8"	5/8"	600	Gray	25	000000	00000
				3/16"	31/32"	29/32"	600	Clear	25	000000	00000
				1/4"	1"	31/32"	600	Green	25	0000000	00000
				9/32"	15/16"	7/8"	600	Yellow	25	000000	00000
				5/16"	3/4"	1 1/16"	600	Blue	25	0000000	00000
				11/32"	7/8"	13/16"	600	Clear	25	000000	00000
				3/8"	1"	29/32"	600	Pink	25	0000000	00000


				13/32"	1"	1"	600	Green	25	000000	00000
				7/16"	1"	1"	600	Gray	25	0000000	00000
				15/32"	1"	1"	600	Blue	25	0000000	00000
				1/2"	1"	25/32"	600	Clear	10	0000000	00000
17/32"				1"	1"	600	Pink	10	0000000	00000
5/8"	1"			31/32"	600	Gray	10	0000000	00000
11/16"	1 1/4"			1 9/32"	600	Blue	10	0000000	00000
3/4"	1"			15/16"	600	Clear	5	0000000	00000
7/8"	1"			1"	600	Green	5	0000000	00000
1"	1"			15/16"	600	Yellow	5	0000000	00000