Fiberglass U-Channels | McMaster-Carr

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Highly Electrically Insulating

Lightweight

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For Use Outdoors

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EAR99

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10,000 psi to 30,000 psi

23,200 psi to 31,000 psi

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60 Products

About Composites

Compare our offering of composites to find the right material for you.

Arc-Resistant GPO3 Fiberglass U-Channels

These GPO3 fiberglass U-channels are often used for electrical applications in humid environments. They are arc and track resistant, plus they have better electrical insulation properties than FRP fiberglass. Made of fiberglass-reinforced polyester, they're also called polyester-grade industrial laminate.

	Outside				Inside									3 ft. Long		5 ft. Long		6 ft. Long
	Wd.	Wd. Tolerance	Ht.	Ht. Tolerance	Wd.	Ht.	Straightness Tolerance	Color	Temp. Range, ° F	Tensile Strength, psi	Impact Strength, ft·lbf/in	Hardness	For Use Outdoors		Each		Each		Each
UL 94 V-0







				1/16" Thick Wall (-0.015" to 0.015")

				2 3/16"	-0.062" to 0.062"	3/4"	-0.062" to 0.062"	1 3/4"	11/16"	0.050"/1 ft.	Red	-50 to 265	10,000 to 15,000	8.2 to 12	Rockwell M95 (Hard)	No	———	0	8523K311	000000	———	0




						1/8" Thick Wall (-0.025" to 0.025")

						2 9/16"	-0.063" to 0.063"	1 7/32"	-0.032" to 0.032"	2 5/16"	1 3/32"	0.050"/1 ft.	Red	—	10,000 to 15,000	8.2 to 12	Barcol 50 (Hard)	No	8523K11	000000	———	0	8523K21	000000




								1/8" Thick Wall (-0.02" to 0.02")

								2"	-0.062" to 0.062"	9/16"	-0.062" to 0.062"	1 3/4"	7/16"	0.050"/1 ft.	Red	-50 to 265	10,000 to 15,000	8.2 to 12	Rockwell M95 (Hard)	No	———	0	8523K32	00000	———	0


								2"	-0.062" to 0.062"	13/16"	-0.062" to 0.062"	1 3/4"	11/16"	0.050"/1 ft.	Red	-50 to 265	10,000 to 15,000	8.2 to 12	Rockwell M95 (Hard)	No	———	0	8523K331	00000	———	0
								2 5/16"	-0.062" to 0.062"	3/4"	-0.062" to 0.062"	2 1/16"	5/8"	0.050"/1 ft.	Red	-50 to 265	10,000 to 15,000	8.2 to 12	Rockwell M95 (Hard)	No	———	0	8523K341	00000	———	0
								3 19/32"	-0.062" to 0.062"	1 1/8"	-0.062" to 0.062"	3 11/32"	1"	0.050"/1 ft.	Red	-50 to 265	10,000 to 15,000	8.2 to 12	Rockwell M95 (Hard)	No	———	0	8523K351	00000	———	0
								4 1/2"	-0.062" to 0.062"	2 1/2"	-0.062" to 0.062"	4 1/4"	2 3/8"	0.050"/1 ft.	Red	-50 to 265	10,000 to 15,000	8.2 to 12	Rockwell M95 (Hard)	No	———	0	8523K361	00000	———	0
								9 21/32"	-0.062" to 0.062"	1 5/8"	-0.062" to 0.062"	9 13/32"	1 1/2"	0.050"/1 ft.	Red	-50 to 265	10,000 to 15,000	8.2 to 12	Rockwell M95 (Hard)	No	———	0	8523K371	000000	———	0




										5/32" Thick Wall (-0.02" to 0.02")

										5 1/2"	-0.062" to 0.062"	1 1/4"	-0.062" to 0.062"	5 3/16"	1 3/32"	0.050"/1 ft.	Red	-50 to 265	10,000 to 15,000	8.2 to 12	Rockwell M95 (Hard)	No	———	0	8523K38	00000	———	0




												3/16" Thick Wall (-0.025" to 0.025")

												3 9/16"	-0.063" to 0.063"	2 9/16"	-0.032" to 0.032"	3 3/16"	2 3/8"	0.050"/1 ft.	Red	—	10,000 to 15,000	8.2 to 12	Barcol 50 (Hard)	No	8523K12	00000	———	0	8523K22	00000


												4 3/4"	-0.063" to 0.063"	1 5/8"	-0.032" to 0.032"	4 3/8"	1 7/16"	0.050"/1 ft.	Red	—	10,000 to 15,000	8.2 to 12	Barcol 50 (Hard)	No	8523K14	00000	———	0	8523K24	00000




														3/16" Thick Wall (-0.02" to 0.02")

														4"	-0.062" to 0.062"	1 3/8"	-0.062" to 0.062"	3 5/8"	1 3/16"	0.050"/1 ft.	Red	-50 to 265	10,000 to 15,000	8.2 to 12	Rockwell M95 (Hard)	No	———	0	8523K39	00000	———	0


														8 1/2"	-0.062" to 0.062"	2 11/16"	-0.062" to 0.062"	8 1/8"	2 1/2"	0.050"/1 ft.	Red	-50 to 265	10,000 to 15,000	8.2 to 12	Rockwell M95 (Hard)	No	———	0	8523K41	000000	———	0




																1/4" Thick Wall (-0.025" to 0.025")

6 1/2"																-0.040" to 0.040"	2 3/4"	-0.020" to 0.020"	6"	2 1/2"	0.050"/1 ft.	Red	—	10,000 to 15,000	8.2 to 12	Barcol 50 (Hard)	No	8523K16	00000	———	0	8523K26	000000




		1/4" Thick Wall (-0.02" to 0.02")

		2"	-0.062" to 0.062"													1"	-0.062" to 0.062"	1 1/2"	3/4"	0.050"/1 ft.	Red	-50 to 265	10,000 to 15,000	8.2 to 12	Rockwell M95 (Hard)	No	———	0	8523K42	00000	———	0


		3"	-0.062" to 0.062"													7/8"	-0.062" to 0.062"	2 1/2"	5/8"	0.050"/1 ft.	Red	-50 to 265	10,000 to 15,000	8.2 to 12	Rockwell M95 (Hard)	No	———	0	8523K43	00000	———	0
		3"	-0.062" to 0.062"													1 1/2"	-0.062" to 0.062"	2 1/2"	1 1/4"	0.050"/1 ft.	Red	-50 to 265	10,000 to 15,000	8.2 to 12	Rockwell M95 (Hard)	No	———	0	8523K44	00000	———	0
		4"	-0.062" to 0.062"													1 1/8"	-0.062" to 0.062"	3 1/2"	7/8"	0.050"/1 ft.	Red	-50 to 265	10,000 to 15,000	8.2 to 12	Rockwell M95 (Hard)	No	———	0	8523K45	000000	———	0
		4 1/2"	-0.062" to 0.062"	2 1/2"												-0.062" to 0.062"	4"	2 1/4"	0.050"/1 ft.	Red	-50 to 265	10,000 to 15,000	8.2 to 12	Rockwell M95 (Hard)	No	———	0	8523K46	000000	———	0




				3/8" Thick Wall (-0.02" to 0.02")

				11 9/32"	-0.062" to 0.062"											1 5/8"	-0.032" to 0.032"	10 17/32"	1 1/4"	0.050"/1 ft.	Red	-50 to 265	10,000 to 15,000	8.2 to 12	Rockwell M95 (Hard)	No	———	0	8523K47	000000	———	0

Structural FRP Fiberglass U-Channels

Made of fiberglass-reinforced polyester, these FRP fiberglass U-channels are an alternative to wood in structural applications. They are strong and lightweight.

Outside				Inside									5 ft. Long		10 ft. Long
Wd.	Wd. Tolerance	Ht.	Ht. Tolerance	Wd.	Ht.	Straightness Tolerance	Color	Temp. Range, ° F	Tensile Strength, psi	Impact Strength, ft·lbf/in	Hardness	For Use Outdoors		Each		Each







			1/8" Thick Wall (-0.013" to 0.013")

			2"	-0.094" to 0.094"	9/16"	-0.094" to 0.094"	1 3/4"	7/16"	0.050"/1 ft.	Green	-60 to 140	7,000 to 30,000	4 to 25	Barcol 45 (Hard)	Yes	8529K61	000000	8529K21	000000




					3/16" Thick Wall (-0.019" to 0.019")

					3 1/2"	-0.094" to 0.094"	1 1/2"	-0.094" to 0.094"	3 1/8"	1 5/16"	0.050"/1 ft.	Green	-60 to 140	7,000 to 30,000	4 to 25	Barcol 45 (Hard)	Yes	8529K41	00000	8529K51	000000




							1/4" Thick Wall (-0.025" to 0.025")

							3"	-0.094" to 0.094"	7/8"	-0.094" to 0.094"	2 1/2"	5/8"	0.050"/1 ft.	Green	-60 to 140	7,000 to 30,000	4 to 25	Barcol 45 (Hard)	Yes	8529K62	00000	8529K22	00000


							3"	-0.094" to 0.094"	1"	-0.094" to 0.094"	2 1/2"	3/4"	0.050"/1 ft.	Green	-60 to 140	7,000 to 30,000	4 to 25	Barcol 45 (Hard)	Yes	8529K11	00000	8529K31	00000
							4"	-0.094" to 0.094"	1 1/8"	-0.094" to 0.094"	3 1/2"	7/8"	0.050"/1 ft.	Green	-60 to 140	7,000 to 30,000	4 to 25	Barcol 45 (Hard)	Yes	8529K63	00000	8529K23	000000
							6"	-0.094" to 0.094"	1 5/8"	-0.094" to 0.094"	5 1/2"	1 3/8"	0.050"/1 ft.	Green	-60 to 140	7,000 to 30,000	4 to 25	Barcol 45 (Hard)	Yes	8529K65	00000	8529K25	000000
							8"	-0.094" to 0.094"	2 3/16"	-0.094" to 0.094"	7 1/2"	1 15/16"	0.050"/1 ft.	Green	-60 to 140	7,000 to 30,000	4 to 25	Barcol 45 (Hard)	Yes	8529K45	000000	8529K55	000000

Arc-Resistant GPO3 Fiberglass Hat Channels

Unlike similar U-channels, these GPO3 fiberglass hat channels have flanges for mounting to flat surfaces. Use them to route and insulate wire in humid environments. All of these hat channels are arc and track resistant. They also have better electrical insulation properties than FRP fiberglass. Made of fiberglass-reinforced polyester, they're often called polyester-grade industrial laminate.

	Outside				Inside									5 ft. Long
	Wd.	Wd. Tolerance	Ht.	Ht. Tolerance	Wd.	Ht.	Straightness Tolerance	Color	Temp. Range, ° F	Tensile Strength, psi	Impact Strength, ft·lbf/in	Hardness	For Use Outdoors		Each
UL 94 V-0







				1/8" Thick Wall (-0.02" to 0.02")

				4 19/32"	-0.062" to 0.062"	7/8"	-0.062" to 0.062"	2 5/32"	3/4"	0.050"/1 ft.	Red	-50 to 265	10,000 to 15,000	8.2 to 12	Barcol 50 (Hard)	No	8986N201	000000


				5"	-0.062" to 0.062"	1 3/8"	-0.062" to 0.062"	3"	1 1/4"	0.050"/1 ft.	Red	-50 to 265	10,000 to 15,000	8.2 to 12	Barcol 50 (Hard)	No	8986N202	00000




						3/16" Thick Wall (-0.02" to 0.02")

						9 9/16"	-0.062" to 0.062"	2 3/8"	-0.062" to 0.062"	7 1/16"	2 1/4"	0.050"/1 ft.	Red	-50 to 265	10,000 to 15,000	8.2 to 12	Barcol 50 (Hard)	No	8986N203	000000

Strut Channel


Slotted Hole—1" Long Slot × 3/8" Wide Slot	Solid

Image of Attribute. Front orientation. Contains Annotated. Channel, Standard.

The standard and most widely used size, this strut channel is 1_5/8" × 1_5/8". Endlessly versatile, use it to support electrical and plumbing systems, install HVAC equipment, build racks, and more. Combine with brackets, fasteners, and other fittings to create your structure.

Slotted Hole—The most adaptable strut channel we offer. The slots make it easy to mount and reposition components without drilling.

Solid—When strength matters most, choose solid strut channel. With no holes or slots, this channel is the least likely to bend or flex, even in long runs.

80" Long—Use with beams spaced 6 ft. (72") apart. This length leaves 4" on each end to attach the channel to a beam.

Fiberglass—Reduce the risk of shock and short circuits with channel that won’t transmit electricity. When conductivity isn’t a concern, fiberglass is good for areas exposed to chemicals and salt water.

		Channel
	Material	Ht.	Wd.	Inside Channel Wd.	Thk.		1 ft. Long	1 1/2 ft. Long	2 ft. Long	3 ft. Long	4 ft. Long	5 ft. Long	6 ft. Long	80" Long	8 ft. Long	10 ft. Long
Slotted Hole—1" Long Slot × 3/8" Wide Slot



		Gray Fiberglass	1 5/8"	1 5/8"	3/4"	0.16"	3261T27	000000	000000	000000	000000	000000	000000	000000	000000	0000000	0000000


		Solid



				Gray Fiberglass	1 5/8"	1 5/8"	3/4"	0.188"	3261T28	00000	00000	00000	00000	00000	00000	00000	00000	00000	00000

Surface Strut Channel Brackets


Style 2	Style 3	Style 5

Style 7	Style 8	Style 12

Style 13	Style 15

The simplest type of strut channel bracket, they're also the easiest to install and reconfigure. However, the connections are not as strong as corner brackets.

Fiberglass—Pair with fiberglass strut channel for a structure that won’t transmit electrical current. When conductivity isn’t a concern, fiberglass is also good for areas exposed to chemicals and salt water.

			Lg.
	Material	Shape	(A)	(B)	Thk.	Hole Dia.	Fasteners Included		Each
Style 2







				For 1 5/8" Channel Width

				Gray Fiberglass	Straight	4 7/8"	1 5/8"	3/8"	7/16"	No	33125T115	000000


				Style 3







								For 1 5/8" Channel Width

								Gray Fiberglass	Straight	6 1/2"	1 5/8"	3/8"	7/16"	No	33125T114	00000


								Style 5







												For 1 5/8" Channel Width

												Gray Fiberglass	Straight	5 1/4"	1 5/8"	3/8"	7/16"	No	33125T123	00000


												Style 7







																For 1 5/8" Channel Width

																Gray Fiberglass	Cross	4 7/8"	4 7/8"	3/8"	7/16"	No	33125T116	00000


																Style 8







																				For 1 5/8" Channel Width

																				Gray Fiberglass	Elbow	3 1/4"	3 1/4"	3/8"	7/16"	No	33125T121	00000


Style 12







																				For 1 5/8" Channel Width

																				Gray Fiberglass	Elbow	4 7/8"	4 7/8"	3/8"	7/16"	No	33125T118	00000


																				Style 13







																				For 1 5/8" Channel Width

																				Gray Fiberglass	Tee	4 7/8"	3 1/4"	3/8"	7/16"	No	33125T122	00000


																				Style 15







																				For 1 5/8" Channel Width

																				Gray Fiberglass	Tee	4 7/8"	4 7/8"	3/8"	7/16"	No	33125T117	00000

Rectangular Strut Channel Nuts

The most common strut channel nuts, these have serrated grooves that grip the lip inside channel.

		For Channel
	Thread Size	Ht.	Wd.	Ht.	Pkg. Qty.		Pkg.
Gray Fiberglass



		1/4"-20	1 1/8", 1 1/2", 1 5/8"	1 5/8"	17/32"	1	3259T784	00000


		3/8"-16	1 1/8", 1 1/2", 1 5/8"	1 5/8"	17/32"	1	3259T785	0000
		1/2"-13	1 1/8", 1 1/2", 1 5/8"	1 5/8"	17/32"	1	3259T786	0000

Corner Strut Channel Brackets


Style 3	Style 16

The most common strut channel brackets. They create stronger connections than surface brackets and are less likely to twist or sway.

			Lg.
	Material	Shape	(A)	(B)	Thk.	Hole Dia.	Fasteners Included		Each
Style 3







				For 1 5/8" Channel Width

				Gray Fiberglass	90° Angle	4"	4"	1/4"	3/8"	No	33125T112	000000


				Style 16







								For 1 5/8" Channel Width

								Gray Fiberglass	45° Angle	2 5/16"	3"	1/4"	9/16"	No	33125T113	00000

Wraparound Strut Channel Washers

Our most stable washers. Wings reach over the edges of strut channel so washers won’t twist when structures vibrate. They also free up your hands during installation—you don’t have to hold them while you insert a threaded rod and twist on a nut.

		For Channel		Each		Package
	For Rod Dia.	Ht.	Wd.		Each	Pkg. Qty.		Pkg.
Fiberglass



		3/8"	13/16", 1 5/8", 2 7/16", 3 1/4"	1 5/8"	1273N182	00000	50	1273N184	0000000


		1/2"	13/16", 1 5/8", 2 7/16", 3 1/4"	1 5/8"	1273N181	0000	50	1273N183	000000