Fiberglass (FRP) Square Tubing

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35 V/mil to 200 V/mil

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45 Products

About Composites

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

Structural FRP Fiberglass Square Tubes

Use these FRP fiberglass square tubes as an alternative to wood in structural applications. Made of fiberglass-reinforced polyester, 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	Impact Strength	Hardness	For Use Outdoors		Each		Each







			1/8" Thick Wall (-0.019" to 0.019")

			1"	-0.094" to 0.094"	1"	-0.094" to 0.094"	3/4"	3/4"	0.03"/1 ft.	Green	-60 to 140	7,000 psi to 30,000 psi (Good)	4 ft·lbf/in to 25 ft·lbf/in (Excellent)	Barcol 45 (Hard)	Yes	0000000	000000	0000000	000000


			1 1/4"	-0.094" to 0.094"	1 1/4"	-0.094" to 0.094"	1"	1"	0.03"/1 ft.	Green	-60 to 140	7,000 psi to 30,000 psi (Good)	4 ft·lbf/in to 25 ft·lbf/in (Excellent)	Barcol 45 (Hard)	Yes	0000000	00000	0000000	00000
			1 1/2"	-0.094" to 0.094"	1 1/2"	-0.094" to 0.094"	1 1/4"	1 1/4"	0.03"/1 ft.	Green	-60 to 140	7,000 psi to 30,000 psi (Good)	4 ft·lbf/in to 25 ft·lbf/in (Excellent)	Barcol 45 (Hard)	Yes	0000000	00000	0000000	00000
			1 3/4"	-0.094" to 0.094"	1 3/4"	-0.094" to 0.094"	1 1/2"	1 1/2"	0.03"/1 ft.	Green	-60 to 140	7,000 psi to 30,000 psi (Good)	4 ft·lbf/in to 25 ft·lbf/in (Excellent)	Barcol 45 (Hard)	Yes	0000000	00000	0000000	00000
			2"	-0.094" to 0.094"	2"	-0.094" to 0.094"	1 3/4"	1 3/4"	0.03"/1 ft.	Green	-60 to 140	7,000 psi to 30,000 psi (Good)	4 ft·lbf/in to 25 ft·lbf/in (Excellent)	Barcol 45 (Hard)	Yes	0000000	00000	0000000	00000




					1/4" Thick Wall (-0.038" to 0.038")

					2"	-0.094" to 0.094"	2"	-0.094" to 0.094"	1 1/2"	1 1/2"	0.03"/1 ft.	Green	-60 to 140	7,000 psi to 30,000 psi (Good)	4 ft·lbf/in to 25 ft·lbf/in (Excellent)	Barcol 45 (Hard)	Yes	0000000	00000	0000000	000000


					2 1/2"	-0.094" to 0.094"	2 1/2"	-0.094" to 0.094"	2"	2"	0.03"/1 ft.	Green	-60 to 140	7,000 psi to 30,000 psi (Good)	4 ft·lbf/in to 25 ft·lbf/in (Excellent)	Barcol 45 (Hard)	Yes	0000000	000000	0000000	000000
					3"	-0.094" to 0.094"	3"	-0.094" to 0.094"	2 1/2"	2 1/2"	0.03"/1 ft.	Green	-60 to 140	7,000 psi to 30,000 psi (Good)	4 ft·lbf/in to 25 ft·lbf/in (Excellent)	Barcol 45 (Hard)	Yes	0000000	000000	0000000	000000
					4"	-0.094" to 0.094"	4"	-0.094" to 0.094"	3 1/2"	3 1/2"	0.03"/1 ft.	Green	-60 to 140	7,000 psi to 30,000 psi (Good)	4 ft·lbf/in to 25 ft·lbf/in (Excellent)	Barcol 45 (Hard)	Yes	0000000	000000	0000000	000000




							3/8" Thick Wall (-0.056" to 0.056")

							6"	-0.094" to 0.094"	6"	-0.094" to 0.094"	5 1/4"	5 1/4"	0.03"/1 ft.	Green	-60 to 140	7,000 psi to 30,000 psi (Good)	4 ft·lbf/in to 25 ft·lbf/in (Excellent)	Barcol 45 (Hard)	Yes	0000000	000000	0000000	000000

Multipurpose Flame-Retardant Garolite G-10/FR4 Rectangular Tubes

These rectangular tubes are flame retardant, machinable, and electrically insulating. They’re made of epoxy resin, making them good for use with printed circuit boards, insulating washers, and transformer components. With low moisture absorption, these tubes are often used as thermal insulators. Made with fiberglass fabric reinforcement, they’re strong and easier to machine than other glass cloth phenolics. Garolite G-10/FR4 is also called epoxy-grade industrial laminate and phenolic.

	Outside				Inside		Temp.							36"
	Wd.	Wd. Tolerance	Ht.	Ht. Tolerance	Wd.	Ht.	Min.	Max., ° F	Tensile Strength	Impact Strength	Hardness	For Use Outdoors	Mil. Spec.		Each
0.063" Thick Wall







				Green

				2.156"	-0.015" to 0.015"	1.156"	-0.015" to 0.015"	2.03"	1.03"	Not Rated	265	32,000 psi to 40,000 psi (Excellent)	5.5 ft·lbf/in to 12 ft·lbf/in (Excellent)	Rockwell M100 (Extra Hard)	Yes	MIL-I-24768/27	0000000	0000000


				1/8" Thick Wall







								Green

								3/4"	-0.015" to 0.015"	3/4"	-0.015" to 0.015"	1/2"	1/2"	Not Rated	265	32,000 psi to 40,000 psi (Excellent)	5.5 ft·lbf/in to 12 ft·lbf/in (Excellent)	Rockwell M100 (Extra Hard)	Yes	MIL-I-24768/27	0000000	000000


								1"	-0.015" to 0.015"	7/8"	-0.015" to 0.015"	3/4"	5/8"	Not Rated	265	32,000 psi to 40,000 psi (Excellent)	5.5 ft·lbf/in to 12 ft·lbf/in (Excellent)	Rockwell M100 (Extra Hard)	Yes	MIL-I-24768/27	0000000	000000


								1/4" Thick Wall







												Green

												1 5/8"	-0.015" to 0.015"	1 1/4"	-0.015" to 0.015"	1 1/8"	3/4"	Not Rated	265	32,000 psi to 40,000 psi (Excellent)	5.5 ft·lbf/in to 12 ft·lbf/in (Excellent)	Rockwell M100 (Extra Hard)	Yes	MIL-I-24768/27	0000000	000000

Arc-Resistant GPO3 Fiberglass Square Tubes

Route and insulate wire using these square fiberglass tubes, which fit better along edges and around corners than round tubes. Use them for electrical applications in humid locations. They’re arc and track resistant, and better electrical insulators than FRP fiberglass. Made of fiberglass-reinforced polyester, they’re also known as 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	Impact Strength	Hardness	For Use Outdoors		Each
UL 94 V-0







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

				1 1/2"	-0.062" to 0.062"	1 1/2"	-0.062" to 0.062"	1 1/4"	1 1/4"	0.050"/1 ft.	Red	-50 to 265	10,000 psi to 15,000 psi (Good)	8.2 ft·lbf/in to 12 ft·lbf/in (Excellent)	Barcol 50 (Hard)	No	00000000	000000




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

						2"	-0.062" to 0.062"	2"	-0.062" to 0.062"	1 1/2"	1 1/2"	0.050"/1 ft.	Red	-50 to 265	10,000 psi to 15,000 psi (Good)	8.2 ft·lbf/in to 12 ft·lbf/in (Excellent)	Barcol 50 (Hard)	No	00000000	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"	0000000	000000	000000	000000	000000	000000	000000	000000	000000	0000000	0000000


		Solid



				Gray Fiberglass	1 5/8"	1 5/8"	3/4"	0.188"	0000000	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	000000000	000000


				Style 3







								For 1 5/8" Channel Width

								Gray Fiberglass	Straight	6 1/2"	1 5/8"	3/8"	7/16"	No	000000000	00000


								Style 5







												For 1 5/8" Channel Width

												Gray Fiberglass	Straight	5 1/4"	1 5/8"	3/8"	7/16"	No	000000000	00000


												Style 7







																For 1 5/8" Channel Width

																Gray Fiberglass	Cross	4 7/8"	4 7/8"	3/8"	7/16"	No	000000000	00000


																Style 8







																				For 1 5/8" Channel Width

																				Gray Fiberglass	Elbow	3 1/4"	3 1/4"	3/8"	7/16"	No	000000000	00000


Style 12







																				For 1 5/8" Channel Width

																				Gray Fiberglass	Elbow	4 7/8"	4 7/8"	3/8"	7/16"	No	000000000	00000


																				Style 13







																				For 1 5/8" Channel Width

																				Gray Fiberglass	Tee	4 7/8"	3 1/4"	3/8"	7/16"	No	000000000	00000


																				Style 15







																				For 1 5/8" Channel Width

																				Gray Fiberglass	Tee	4 7/8"	4 7/8"	3/8"	7/16"	No	000000000	00000

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	000000000	000000


				Style 16







								For 1 5/8" Channel Width

								Gray Fiberglass	45° Angle	2 5/16"	3"	1/4"	9/16"	No	000000000	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	00000000	00000


		3/8"-16	1 1/8", 1 1/2", 1 5/8"	1 5/8"	17/32"	1	00000000	0000
		1/2"-13	1 1/8", 1 1/2", 1 5/8"	1 5/8"	17/32"	1	00000000	0000

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"	00000000	00000	50	00000000	0000000


		1/2"	13/16", 1 5/8", 2 7/16", 3 1/4"	1 5/8"	00000000	0000	50	00000000	000000