U Channel Framing | McMaster-Carr

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Highly Electrically Insulating

Lightweight

Ultra Impact Resistant

Inside Corner Shape

For Use Outdoors

Outside Corner Shape

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Hardness Rating

Flexural Strength

10,000 psi to 30,000 psi

23,200 psi to 31,000 psi

121,000 psi

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Opaque

Tensile Strength

7,000 psi to 30,000 psi

10,000 psi to 15,000 psi

103,000 psi

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Yes

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Exempt

Export Control Classification Number (ECCN)

EAR99

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52 Products

About Composites

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

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 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

High-Strength Lightweight Carbon Fiber U-Channels

Often used to make railings, edge covers, and other structural framing parts, these carbon fiber U-channels add stiffness and strength to applications without adding a lot of weight. They’re similar in strength to 6061 aluminum yet lighter in weight. With a plain weave and 0°/90° construction layup, all are easy to machine. They won’t splinter when cut.

	Outside				Inside									36" Long		74" Long
	Wd.	Wd. Tolerance	Ht.	Ht. Tolerance	Wd.	Ht.	Color	Tensile Strength, psi	Fiber Tensile Stiffness	Max. Temp., ° F	Impact Strength	Hardness	For Use Outdoors		Each		Each
Checked Glossy U-Channels







				0.05" Thick Wall (-0.06" to 0.06")

				2 1/8"	-0.125" to 0.125"	1"	-0.126" to 0.126"	2"	0.945"	Black	103,000	33 msi to 36 msi (Standard)	275	Not Rated	Not Rated	No	5218N112	0000000	5218N111	0000000


				2 1/8"	-0.125" to 0.125"	1 1/4"	-0.128" to 0.128"	2"	1.195"	Black	103,000	33 msi to 36 msi (Standard)	275	Not Rated	Not Rated	No	5218N114	000000	5218N113	000000
				2 1/8"	-0.125" to 0.125"	1 1/2"	-0.132" to 0.132"	2"	1.445"	Black	103,000	33 msi to 36 msi (Standard)	275	Not Rated	Not Rated	No	5218N116	000000	5218N115	000000
				3 1/8"	-0.125" to 0.125"	1 1/2"	-0.132" to 0.132"	3"	1.445"	Black	103,000	33 msi to 36 msi (Standard)	275	Not Rated	Not Rated	No	5218N118	000000	5218N117	000000
				3 1/8"	-0.125" to 0.125"	1 3/4"	-0.134" to 0.134"	3"	1.695"	Black	103,000	33 msi to 36 msi (Standard)	275	Not Rated	Not Rated	No	5218N121	000000	5218N119	000000




						0.06" Thick Wall (-0.06" to 0.06")

						4 1/8"	-0.125" to 0.125"	2"	-0.136" to 0.136"	4"	1.935"	Black	103,000	33 msi to 36 msi (Standard)	275	Not Rated	Not Rated	No	5218N123	000000	5218N122	000000


						4 1/8"	-0.125" to 0.125"	2 1/4"	-0.138" to 0.138"	4"	2.185"	Black	103,000	33 msi to 36 msi (Standard)	275	Not Rated	Not Rated	No	5218N125	000000	5218N124	000000