Square Protective Caps | McMaster-Carr

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133 Products

Square Caps

Vinyl Plastic

Polyethylene

Fit these caps over the ends of square tubing, framing rails, and posts to prevent damage and keep out dust, paint, and coatings.

Vinyl Plastic—A good all-around choice, these durable caps won’t rip or shred, even with repeated use. They also hold up to oils, mild acids, and solvents. Caps are flexible and conform to parts for a tight fit.

Polyethylene—These tough caps are hard and wear resistant to hold up against scrapes and gouges.

	For Outside
	Lg.	Wd.	Inside Ht.	Flexibility	Max. Temp., ° F	Color	Pkg. Qty.		Pkg.
Vinyl Plastic



		1/4"	1/4"	1"	Flexible	200	Black	100	9092K81	000000


		5/16"	5/16"	1"	Flexible	200	Black	100	9092K82	00000
		3/8"	3/8"	1"	Flexible	200	Black	100	9092K83	00000
		7/16"	7/16"	1"	Flexible	200	Black	50	9092K84	0000
		1/2"	1/2"	1/2"	Flexible	200	Black	50	9092K32	0000
		1/2"	1/2"	1"	Flexible	200	Black	50	9092K34	00000
		5/8"	5/8"	1/2"	Flexible	200	Black	100	9092K85	00000
		3/4"	3/4"	1/2"	Flexible	200	Black	50	9092K36	00000
		3/4"	3/4"	1"	Flexible	200	Black	50	9092K38	00000
		1"	1"	1/2"	Flexible	200	Black	50	9092K33	00000
		1"	1"	1"	Flexible	200	Black	50	9092K35	00000


		1"	1"	1 1/2"	Flexible	200	Black	50	9092K11	00000
		1"	1"	2"	Flexible	200	Black	25	9092K24	00000
		1 1/4"	1 1/4"	1/2"	Flexible	200	Black	25	9092K37	00000
		1 1/4"	1 1/4"	1"	Flexible	200	Black	25	9092K39	00000
		1 1/2"	1 1/2"	1/2"	Flexible	200	Black	25	9092K54	00000
		1 1/2"	1 1/2"	1"	Flexible	200	Black	25	9092K56	00000
		1 1/2"	1 1/2"	1 1/2"	Flexible	200	Black	25	9092K13	00000
		1 1/2"	1 1/2"	2"	Flexible	200	Black	25	9092K26	00000
		1 5/8"	1 5/8"	1"	Flexible	200	Black	10	9092K71	0000
		1 3/4"	1 3/4"	1"	Flexible	200	Black	10	9092K72	0000


		1 7/8"	1 7/8"	1"	Flexible	200	Black	10	9092K73	0000
		2"	2"	1/2"	Flexible	200	Black	10	9092K61	0000
		2"	2"	1"	Flexible	200	Black	10	9092K62	00000
		2"	2"	1 1/2"	Flexible	200	Black	10	9092K15	00000
		2"	2"	2"	Flexible	200	Black	10	9092K28	00000
		2 1/2"	2 1/2"	1"	Flexible	200	Black	10	9092K74	00000
		2 1/2"	2 1/2"	1 1/2"	Flexible	200	Black	10	9092K17	00000
		2 1/2"	2 1/2"	2"	Flexible	200	Black	10	9092K31	00000
		3"	3"	1"	Flexible	200	Black	5	9092K75	0000
		3"	3"	1 1/2"	Flexible	200	Black	5	9092K19	0000


		3"	3"	2"	Flexible	200	Black	5	9092K41	00000
		3 1/2"	3 1/2"	1"	Flexible	200	Black	5	9092K76	00000
		3 1/2"	3 1/2"	1 1/2"	Flexible	200	Black	5	9092K21	00000
		3 1/2"	3 1/2"	2"	Flexible	200	Black	5	9092K42	00000
		4"	4"	1"	Flexible	200	Black	5	9092K77	00000
		4"	4"	1 1/2"	Flexible	200	Black	5	9092K22	00000
		4"	4"	2"	Flexible	200	Black	5	9092K43	00000


		Polyethylene



				1/2"	1/2"	1/2"	Rigid	160	Black	100	92675K41	0000


				5/8"	5/8"	1/2"	Rigid	160	Black	100	92675K42	00000
				3/4"	3/4"	1/2"	Rigid	160	Black	100	92675K43	00000
				1"	1"	1/2"	Rigid	160	Black	100	92675K44	00000

Snap-In Square Plugs


Style 1	Style 2

Style 3

Press firmly into square holes for a tighter hold than push-in plugs. These are good for semi-permanent installations, such as finishing the ends of posts and furniture. To remove, you’ll need a tool such as a flat-head screwdriver to pop them out.

Styles 1 and 2—Flexible ribs compress and expand to secure the plug.

Style 3—Often used to keep dirt and moisture out of poles, these plugs have straps that flex and then hold them in place.

Polyethylene—A balance of wear and chemical resistance for use in a variety of environments. These plugs withstand scratches and scrapes as well as mild acids, solvents, and chemical cleaners.

Vinyl Plastic—More durable against wear and tear than polyethylene. These plugs also hold up to oils, mild acids, and solvents.

High-Strength Glass-Filled Plastic—Tough for the most demanding environments, including outdoor installations.

	For Inside			Head
	Lg.	Wd.	Ht.	Lg.	Wd.	Max. Temp., ° F	Color	Pkg. Qty.		Pkg.
Style 1







				Polyethylene

				0.37" to 0.4"	0.37" to 0.4"	7/16"	1/2"	1/2"	150	Black	50	9565K94	00000


				0.46" to 0.55"	0.46" to 0.55"	7/16"	5/8"	5/8"	150	Black	50	9565K95	0000
				0.6" to 0.67"	0.6" to 0.67"	7/16"	3/4"	3/4"	150	Black	100	9565K5	00000
				0.71" to 0.8"	0.71" to 0.8"	7/16"	7/8"	7/8"	150	Black	50	9565K16	00000
				0.72" to 0.84"	0.72" to 0.84"	7/16"	1"	1"	150	Black	100	9565K52	00000
				0.85" to 0.92"	0.85" to 0.92"	7/16"	1"	1"	150	Black	100	9565K51	00000
				0.96" to 1.05"	0.96" to 1.05"	1/2"	1 1/8"	1 1/8"	150	Black	25	9565K62	00000
				1.02" to 1.1"	1.02" to 1.1"	1/2"	1 3/16"	1 3/16"	150	Black	25	9565K806	00000
				1.1" to 1.17"	1.1" to 1.17"	1/2"	1 1/4"	1 1/4"	150	Black	50	9565K53	00000
				1.11" to 1.2"	1.11" to 1.2"	1/2"	1 3/8"	1 3/8"	150	Black	25	9565K17	00000
				1.21" to 1.3"	1.21" to 1.3"	1/2"	1 3/8"	1 3/8"	150	Black	25	9565K21	00000


				1.29" to 1.34"	1.29" to 1.34"	1/2"	1 1/2"	1 1/2"	150	Black	25	9565K55	00000
				1.35" to 1.42"	1.35" to 1.42"	1/2"	1 1/2"	1 1/2"	150	Black	25	9565K54	00000
				1.42" to 1.5"	1.42" to 1.5"	11/16"	1 9/16"	1 9/16"	150	Black	25	9565K807	00000
				1.49" to 1.58"	1.49" to 1.58"	1/2"	1 3/4"	1 3/4"	150	Black	20	9565K32	00000
				1.59" to 1.68"	1.59" to 1.68"	1/2"	1 3/4"	1 3/4"	150	Black	10	9565K65	0000
				1.74" to 1.83"	1.74" to 1.83"	1/2"	2"	2"	150	Black	20	9565K38	00000
				1.85" to 1.92"	1.85" to 1.92"	11/16"	2"	2"	150	Black	25	9565K56	00000
				1.99" to 2.08"	1.99" to 2.08"	1/2"	2 1/4"	2 1/4"	150	Black	10	9565K91	0000
				2.09" to 2.23"	2.09" to 2.23"	9/16"	2 1/2"	2 1/2"	175	Black	1	9565K801	0000
				2.24" to 2.33"	2.24" to 2.33"	1/2"	2 1/2"	2 1/2"	150	Black	10	9565K92	00000


				2.37" to 2.45"	2.37" to 2.45"	9/16"	2 1/2"	2 1/2"	175	Black	1	9565K802	0000
				2.42" to 2.58"	2.42" to 2.58"	23/32"	2 3/4"	2 3/4"	150	Black	10	9565K39	00000
				2.49" to 2.64"	2.49" to 2.64"	1/2"	3"	3"	150	Black	10	9565K93	00000
				2.59" to 2.68"	2.59" to 2.68"	21/32"	2 3/4"	2 3/4"	150	Black	10	9565K43	00000
				2.73" to 2.83"	2.73" to 2.83"	23/32"	3"	3"	150	Black	1	9565K808	0000
				3.05" to 3.26"	3.05" to 3.26"	29/32"	3 17/32"	3 17/32"	150	Black	1	9565K809	0000
				3.1"	3.1"	11/16"	3 1/2"	3 1/2"	150	Black	1	9565K48	00000
				3.33" to 3.43"	3.33" to 3.43"	11/16"	3 1/2"	3 1/2"	175	Black	1	9565K803	0000
				3.44" to 3.62"	3.44" to 3.62"	15/16"	3 15/16"	3 15/16"	150	Black	1	9565K81	0000
				3.52" to 3.76"	3.52" to 3.76"	29/32"	4"	4"	150	Black	1	9565K49	0000


				3.64" to 3.76"	3.64" to 3.76"	1"	4"	4"	150	Black	1	9565K811	0000
				4.34" to 4.51"	4.34" to 4.51"	1"	4 3/4"	4 3/4"	150	Black	1	9565K59	00000
				4.48" to 4.73"	4.48" to 4.73"	1"	5"	5"	175	Black	1	9565K804	00000
				5.48" to 5.73"	5.48" to 5.73"	1"	6"	6"	175	Black	1	9565K805	00000




						Vinyl Plastic

						0.59" to 0.68"	0.59" to 0.68"	7/16"	3/4"	3/4"	350	Black	25	7984N11	0000


						0.73" to 0.83"	0.73" to 0.83"	7/16"	1"	1"	350	Black	10	7984N12	0000
						0.83" to 0.93"	0.83" to 0.93"	7/16"	1"	1"	350	Black	10	7984N13	0000
						1.08" to 1.18"	1.08" to 1.18"	1/2"	1 1/4"	1 1/4"	350	Black	10	7984N14	0000
1.23" to 1.33"						1.23" to 1.33"	1/2"	1 1/2"	1 1/2"	350	Black	10	7984N15	0000
1.33" to 1.43"	1.33" to 1.43"					1/2"	1 1/2"	1 1/2"	350	Black	10	7984N16	0000
1.73" to 1.83"	1.73" to 1.83"					1/2"	2"	2"	350	Black	1	7984N17	0000


Style 2







						Polyethylene

						0.584" to 0.68"	0.584" to 0.68"	1/2"	3/4"	3/4"	175	Black	10	9565K45	0000


						0.709" to 0.805"	0.709" to 0.805"	1/2"	7/8"	7/8"	175	Black	10	9565K46	0000


						Style 3







										High-Strength Glass-Filled Plastic

										2.5"	2.5"	1 3/8"	3"	3"	300	Black	1	97535K3	0000


										3.5"	3.5"	1 3/8"	4"	4"	300	Black	1	97535K5	0000
										4.5"	4.5"	1 1/4"	5"	5"	300	Black	1	97535K7	0000
										5.5"	5.5"	1 3/16"	6"	6"	300	Black	1	97535K9	0000

Push-In Square Plugs

Close off the ends of square tubing and furniture to cover sharp edges and keep out dust and moisture.

Polyethylene—A balance of wear and chemical resistance for use in a variety of environments. These plugs withstand scratches and scrapes as well as mild acids, solvents, and chemical cleaners.

	For Inside			Head
	Lg.	Wd.	Ht.	Lg.	Wd.	Max. Temp., ° F	Color	Pkg. Qty.		Pkg.
Polyethylene



		0.37"	0.37"	1/2"	1/2"	1/2"	150	Black	100	9565K13	000000


		0.62"	0.62"	1/2"	3/4"	3/4"	150	Black	100	9565K11	00000
		0.76"	0.76"	1/2"	1"	1"	150	Black	100	9565K12	00000
		0.83"	0.83"	1/2"	1"	1"	150	Black	100	9565K22	00000
		0.87"	0.87"	1/2"	1"	1"	150	Black	100	9565K23	00000
		0.9"	0.9"	1/2"	1"	1"	150	Black	100	9565K24	00000
		0.93"	0.93"	1/2"	1"	1"	150	Black	100	9565K25	00000
		1.01"	1.01"	1/2"	1 1/4"	1 1/4"	150	Black	100	9565K28	00000
		1.08"	1.08"	1/2"	1 1/4"	1 1/4"	150	Black	100	9565K14	00000
		1.12"	1.12"	1/2"	1 1/4"	1 1/4"	150	Black	100	9565K15	00000
		1.26"	1.26"	1/2"	1 1/2"	1 1/2"	150	Black	50	9565K29	00000


		1.33"	1.33"	1/2"	1 1/2"	1 1/2"	150	Black	50	9565K26	00000
		1.37"	1.37"	1/2"	1 1/2"	1 1/2"	150	Black	50	9565K27	00000
		1.76"	1.76"	1/2"	2"	2"	150	Black	50	9565K31	00000
		1.83"	1.83"	1/2"	2"	2"	150	Black	50	9565K18	00000
		1.87"	1.87"	1/2"	2"	2"	150	Black	50	9565K19	00000

Stretchable Elastic Dust Covers

Similar to a shower cap, these covers have an elastic band that allows them to stretch and cover a variety of shapes in a range of sizes. They are often used in masking applications to protect against contaminants.

	Color	Max. Temp., ° F	Performance	Pkg. Qty.		Pkg.
Flexible Polyethylene



	1 1/2" to 5"	Clear	150	Stretchable	10	1056N11	000000


	1 1/2" to 8"	Clear	150	Stretchable	5	1056N14	00000
	2 1/4" to 11"	Clear	150	Stretchable	5	1056N15	00000
	2 7/8" to 16"	Clear	150	Stretchable	5	1056N16	00000
	3 5/8" to 17"	Clear	150	Stretchable	2	1056N17	00000
	4 3/8" to 24"	Clear	150	Stretchable	2	1056N18	00000

Watertight Square Plugs for Enclosures

Seal unused square holes on the bottom of enclosures, such as floor drainage holes. These plugs have an adhesive-gasket backing that locks out water and dust to keep your electrical components dry and contaminant-free. Stick them in place from the outside.

	For Hole			Head
	Lg.	Wd.	For Max. Panel Thk.	Lg.	Wd.	For Enclosure Rating	Reaches Full Strength, hr.	Certification	Specs. Met		Each
Adhesive







				Polycarbonate

				2"	2"	0.19"	3"	3"	NEMA 12, NEMA 4X, IP56	72	C-UL Recognized Component, UL Recognized Component	UL 508A	6828N11	00000

Metal Square Plugs

Designed to finish off the ends of square metal tubing, these plugs cover rough edges and block dirt and debris. Push into place and then drive with a hammer to secure.

Steel—The strongest plugs, but moisture can cause them to rust.

Galvanized Steel—Strong with some rust resistance in wet environments.

Aluminum—For aluminum tubing, use these plugs instead of steel to avoid rust that spreads when different metals are in contact.

	For Inside			Head
	Lg.	Wd.	Ht.	Lg.	Wd.		Each
Steel



		0.76"	0.76"	1/2"	1"	1"	2990N11	00000


		0.85"	0.85"	3/4"	1"	1"	2990N15	0000
		1.02"	1.02"	5/8"	1 1/4"	1 1/4"	2990N18	00000
		1.1"	1.1"	3/4"	1 1/4"	1 1/4"	2990N14	0000
		1.26"	1.26"	13/16"	1 1/2"	1 1/2"	2990N12	0000
		1.38"	1.38"	13/16"	1 1/2"	1 1/2"	2990N16	0000
		1.64"	1.64"	3/4"	2"	2"	2990N19	00000
		1.76"	1.76"	3/4"	2"	2"	2990N13	00000
		1.85"	1.85"	7/8"	2"	2"	2990N17	0000


		Galvanized Steel



				1.27"	1.27"	13/16"	1 1/2"	1 1/2"	2990N21	00000


				Aluminum



						0.77"	0.77"	1/2"	1"	1"	2990N23	00000


						1.02"	1.02"	5/8"	1 1/4"	1 1/4"	2990N22	00000
						1.27"	1.27"	13/16"	1 1/2"	1 1/2"	2990N24	00000
						1.77"	1.77"	3/4"	2"	2"	2990N25	00000

Stacking Caps and Targets

Stacking Caps

Targets

Weld these caps and targets to the ends of posts to create stackable shelving and racking systems. The stacking caps fit into the targets and provide the stability you need for stacking structures on top of one another. They can also be used to replace damaged caps and targets in existing systems.

	For Post		Target Mounting		Overall
	Wd.	Dp.	Wd.	Dp.	Wd.	Dp.	Ht.		Each
Steel







				Stacking Caps

				1 1/2"	1 1/2"	—	—	—	—	1 1/2"	8815N13	00000


				1 3/4"	1 3/4"	—	—	—	—	2"	8815N15	0000
				2"	2"	—	—	—	—	1 7/8"	8815N11	0000
				2 1/2"	2 1/2"	—	—	—	—	2"	8815N12	0000




						Targets

						1 1/2", 2"	1 1/2", 2"	1 1/2"	1 1/4"	4"	4"	1 7/16"	8815N21	0000


						2 1/2"	2 1/2"	1 1/2"	1 1/2"	5"	5"	1 5/8"	8815N22	0000