Fiberglass Flanges | McMaster-Carr

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System of Measurement

Pipe Size

Shape

Fitting Type

Number of Bolt Holes

For Flange ANSI Class

Color

Fitting Connection

For Use With

Sodium Hydroxide (Caustic Soda)

Maximum Temperature

Performance

Ultra Chemical Resistant

Fitting Material

Fiberglass

Flanged Connection Surface

Minimum Temperature

Thickness

U.S.–Mexico–Canada Agreement (USMCA) Qualifying

Yes

Maximum Pressure

750 psi to 999 psi

Export Control Classification Number (ECCN)

EAR99

DFARS Specialty Metals

RoHS

REACH

Pipe Material

Backing Type

99 Products

Fiberglass Pipe Flanges for Chemicals

Flanges have excellent corrosion resistance to handle a wide range of acids and other highly-corrosive chemicals. Use in metal surface treating applications, plating solution lines, and other chemical process applications. They are reinforced with fiberglass layers for better strength and durability than any of our other pipe flanges for chemicals. Bolt two same-size flanges together with a gasket (sold separately) to create an access point within a line. Flanges meet ASTM D4024 specifications and testing requirements for product dimensions, performance, and material quality.

To connect flanges to pipe, first sand the inside of the flange and the end of the pipe to remove the surface finish. Next, mix the adhesive (sold separately) until the color is uniform with no streaks. Apply a thin layer of mixed adhesive to the sanded area of the pipe, approximately _1/8" thick. Repeat this process with the inside of the flange, applying a layer approximately _1/16" thick. After sealant has been applied, push the flange onto the pipe until it is fully engaged. Make sure you align the bolt holes prior to installing to minimize rotation after the flange is installed. Finally, use the adhesive-curing heat cable (sold separately) to cure the adhesive. Wrap the tape around the pipe and flange at the joint, taking care to not overlap the tape. Once you have waited the full cure time, the pipe and flange will be ready to use.

Flanges


Front	Flat Surface on Back

	Pipe Size					Bolt Hole
	(A)	(B)	Flanged Connection Surface (B)	Flange OD	For Bolt Dia.	Dia.	No. Of	Bolt Circle Dia.	Material	Color	Max. Pressure @ Temp.		Each
Cement Socket Female



		1 1/2	1 1/2	Flat	5"	1/2"	5/8"	4	3 7/8"	Fiberglass	Black	300 psi @ 72° F	2761N38	0000000


		2	2	Flat	6"	5/8"	3/4"	4	4 3/4"	Fiberglass	Black	250 psi @ 72° F	2761N39	000000
		3	3	Flat	7 1/2"	5/8"	3/4"	4	6"	Fiberglass	Black	250 psi @ 72° F	2761N41	000000
		4	4	Flat	9"	5/8"	3/4"	8	7 1/2"	Fiberglass	Black	150 psi @ 72° F	2761N42	000000

Pipe Cement

		Each
Pipe Cement (11.8-fl. oz. Can)	2905N53	000000

Blind Flanges

Flanged

Flat

					Bolt Hole
	Pipe Size	Flanged Connection Surface	Flange OD	For Bolt Dia.	Dia.	No. Of	Bolt Circle Dia.	Material	Color	Max. Pressure @ Temp.		Each
Flanged



		1 1/2	Flat	5"	1/2"	5/8"	4	3 7/8"	Fiberglass	Black	300 psi @ 72° F	2761N34	0000000


		2	Flat	6"	5/8"	3/4"	4	4 3/4"	Fiberglass	Black	250 psi @ 72° F	2761N35	000000
		3	Flat	7 1/2"	5/8"	3/4"	4	6"	Fiberglass	Black	250 psi @ 72° F	2761N36	000000
		4	Flat	9"	5/8"	3/4"	8	7 1/2"	Fiberglass	Black	150 psi @ 72° F	2761N37	000000

Pipe Cement

		Each
Pipe Cement (11.8-fl. oz. Can)	2905N53	000000

Adhesive-Curing Heat Cable

Image of Product. Front orientation. Heating Tape.

Voltage, V AC	Current, amp	Max. Heat Output, ° F	Lg., ft.	Wd.	Thk.	Cord Lg., ft.		Each
120	15	270	6	1"	1/8"	6	2905N52	0000000

Ultra-Chemical-Resistant High-Strength PTFE Pipe Gaskets with Bolt Holes

A fiberglass filler in these PTFE gaskets provides strength to prevent them from thinning out when compressed. They resist hydrocarbons, solvents, refrigerants, and moderate concentrations of acids. Commonly called full-face gaskets, they cover the entire face of flat-surface pipe flanges and align with the bolt holes. All gasket specifications are sized to meet ANSI standards.

Plain-Back Gaskets for ANSI Flanges

For ANSI Class 150—Gaskets for ANSI Class 150 flanges are compatible with low-pressure pipe flanges.

For ANSI Class 300—Gaskets for ANSI Class 300 flanges are compatible with medium-pressure pipe flanges.

									1/16" Thick
	For Pipe Size	ID	OD	No. of Bolt Holes	Max. Pressure, psi	Temp. Range, ° F	Hardness	Color		Each
For ANSI Class 150



		1/2	27/32"	3 1/2"	4	800	-450 to 500	Not Rated	Blue	3369T21	00000


		3/4	1 1/16"	3 7/8"	4	800	-450 to 500	Not Rated	Blue	3369T22	0000
		1	1 5/16"	4 1/4"	4	800	-450 to 500	Not Rated	Blue	3369T71	00000
		1 1/4	1 21/32"	4 5/8"	4	800	-450 to 500	Not Rated	Blue	3369T23	00000
		1 1/2	1 29/32"	5"	4	800	-450 to 500	Not Rated	Blue	3369T72	00000
		2	2 3/8"	6"	4	800	-450 to 500	Not Rated	Blue	3369T73	00000
		2 1/2	2 7/8"	7"	4	800	-450 to 500	Not Rated	Blue	3369T74	00000
		3	3 1/2"	7 1/2"	4	800	-450 to 500	Not Rated	Blue	3369T75	00000
		3 1/2	4"	8 1/2"	8	800	-450 to 500	Not Rated	Blue	3369T24	00000
		4	4 1/2"	9"	8	800	-450 to 500	Not Rated	Blue	3369T76	00000
		5	5 9/16"	10"	8	800	-450 to 500	Not Rated	Blue	3369T25	00000


		6	6 5/8"	11"	8	800	-450 to 500	Not Rated	Blue	3369T77	00000
		8	8 5/8"	13 1/2"	8	800	-450 to 500	Not Rated	Blue	3369T26	000000
		10	10 3/4"	16"	12	800	-450 to 500	Not Rated	Blue	3369T27	000000
		12	12 3/4"	19"	12	800	-450 to 500	Not Rated	Blue	3369T28	000000


		For ANSI Class 300



				1	1 5/16"	4 7/8"	4	800	-450 to 500	Not Rated	Blue	3369T911	00000


				1 1/2	1 29/32"	6 1/8"	4	800	-450 to 500	Not Rated	Blue	3369T912	00000
				2	2 3/8"	6 1/2"	8	800	-450 to 500	Not Rated	Blue	3369T913	00000
				2 1/2	2 7/8"	7 1/2"	8	800	-450 to 500	Not Rated	Blue	3369T914	00000
				3	3 1/2"	8 1/4"	8	800	-450 to 500	Not Rated	Blue	3369T915	00000
				4	4 1/2"	10"	8	800	-450 to 500	Not Rated	Blue	3369T916	00000
				6	6 5/8"	12 1/2"	12	800	-450 to 500	Not Rated	Blue	3369T917	00000

Flange Nuts

No need for a separate washer—these nuts have a plain flange that distributes pressure evenly for a wide variety of fastening applications. They are ideal for securing screws in oversized or irregularly shaped holes since the flange covers a larger area than standard nuts. Also known as collar nuts.

Fiberglass

Fiberglass—With the best strength-to-weight ratio of all our flange nuts, these hold up in high-stress applications without adding weight to your assembly. They also resist acids, solvents, oil, and salt water.

				Flange
	Thread Size	Wd.	Ht.	Dia.	Thk.	Color		Each
Fiberglass



		1/4"-20	7/16"	19/32"	19/32"	0.1"	Gray	98945A052	00000


		3/8"-16	9/16"	3/4"	3/4"	0.12"	Gray	98945A041	0000
		3/8"-24	9/16"	3/4"	3/4"	0.12"	Gray	98945A051	0000
		1/2"-13	3/4"	7/8"	1 1/32"	0.13"	Gray	98945A043	0000
		1/2"-20	3/4"	7/8"	1 1/32"	0.13"	Gray	98945A053	0000
		5/8"-11	15/16"	1 1/4"	1 9/32"	0.13"	Gray	98945A045	0000
		3/4"-10	1 1/8"	1 19/32"	1 1/2"	0.13"	Gray	98945A048	0000

Ultra-Chemical-Resistant High-Strength PTFE Pipe Gaskets

Reinforced with fiberglass filler for strength, these PTFE gaskets won’t thin out when compressed. They resist hydrocarbons, solvents, refrigerants, and moderate concentrations of acids. Also known as ring gaskets, use them with raised-surface pipe flanges; they fit the surface inside the bolt holes and do not interfere with the bolt connection. All gaskets are compatible with low-pressure pipe flanges and are sized to meet ANSI standards.

Plain-Back Gaskets for ANSI Flanges

								1/16" Thick
	For Pipe Size	ID	OD	Max. Pressure, psi	Temp. Range, ° F	Hardness	Color		Each
For ANSI Class 150



		1/2	27/32"	1 7/8"	800	-450 to 500	Not Rated	Blue	3369T11	00000


		3/4	1 1/16"	2 1/4"	800	-450 to 500	Not Rated	Blue	3369T29	0000
		1	1 5/16"	2 5/8"	800	-450 to 500	Not Rated	Blue	3369T61	0000
		1 1/4	1 21/32"	3"	800	-450 to 500	Not Rated	Blue	3369T13	0000
		1 1/2	1 29/32"	3 3/8"	800	-450 to 500	Not Rated	Blue	3369T62	0000
		2	2 3/8"	4 1/8"	800	-450 to 500	Not Rated	Blue	3369T63	00000
		2 1/2	2 7/8"	4 7/8"	800	-450 to 500	Not Rated	Blue	3369T64	00000
		3	3 1/2"	5 3/8"	800	-450 to 500	Not Rated	Blue	3369T65	00000
		4	4 1/2"	6 7/8"	800	-450 to 500	Not Rated	Blue	3369T66	00000
		5	5 9/16"	7 3/4"	800	-450 to 500	Not Rated	Blue	3369T32	00000
		6	6 5/8"	8 3/4"	800	-450 to 500	Not Rated	Blue	3369T33	00000


		8	8 5/8"	11"	800	-450 to 500	Not Rated	Blue	3369T34	00000
		10	10 3/4"	13 3/8"	800	-450 to 500	Not Rated	Blue	3369T35	000000
		12	12 3/4"	16 1/8"	800	-450 to 500	Not Rated	Blue	3369T36	000000

Leak-Detecting Pipe Flange Covers with pH Patch

When a tiny amount of liquid makes contact with the pH patch, it changes color to indicate a leak. Patch is orange when neutral. The wrap-around design of these covers contains acid and caustic pipe leaks, protecting personnel and equipment.

PTFE-Coated Fiberglass—PTFE-coated fiberglass covers are highly resistant to acids, alkalies, and most chemicals except hydrofluoric acid.

	Max. Temp., ° F	For Use Outdoors		Each
PTFE-Coated Fiberglass







	Beige

	1/2	27/32"	150	450	Yes	6811K24	000000


	3/4	1 3/64"	150	450	Yes	6811K25	00000
	1	1 5/16"	150	450	Yes	6811K26	00000
	1 1/2	1 29/32"	150	450	Yes	6811K28	00000
	2	2 3/8"	150	450	Yes	6811K29	00000
	3	3 1/2"	150	450	Yes	6811K32	00000
	4	4 1/2"	150	450	Yes	6811K34	00000
	6	6 5/8"	150	450	Yes	6811K36	00000

Replacement Leak-Detecting pH Patches

	Pkg. Qty.		Pkg.
Replacement pH Patches	10	9169K77	000000

High-Temperature Flat Bellows

These bellows withstand temperatures up to 500° F—more than twice as much as standard flat bellows. Use them to guard flat moving surfaces on machinery. Sewn seams let these bellows breathe, so they retract quickly in fast-cycling applications. The seams will allow small amounts of moisture and dust to pass through.

	Lg.
	Extended, ft.	Retracted	Travel	Material	Material Thk.	Max. Temp., ° F	Mounting Fasteners Included		Each
Protects Against Abrasive Grit, Acid, Coolant, Cutting Fluid, Dust, Hydraulic Fluid, Metal Chips, Solvents, Sparks, Synthetic Oil, Welding Spatter, and Wood Chips







				9/16" Outside Ht. × 12" Outside Wd.

				1	1"	11 3/8"	PTFE-Coated Fiberglass Fabric	0.01"	500	No	2437N11	0000000


				2	1 15/16"	22 1/16"	PTFE-Coated Fiberglass Fabric	0.01"	500	No	2437N12	000000

High-Temperature Breathable Round Bellows with Flange Ends

These fiberglass bellows withstand temperatures up to 450° F—about twice as much as standard breathable round bellows with flange ends. They also protect against flames and sparks. Slide these bellows over moving parts such as rods and shafts. Sewn seams let them breathe, so they retract quickly in fast-cycling applications. The seams will allow small amounts of moisture and dust to pass through. Screw mount the flange ends to surfaces, or add a mounting flange (sold separately) for stability.

	Bellows											Bellows Mounts
	Lg.
	Extended, ft.	Retracted	Travel	Req. ID Clearance	Material	Material Thk.	Temp. Range, ° F	Max. Temp., ° F	Mounting Fasteners Included		Each		Each
Protects Against Flames, Sparks, and Oil







				3/4" ID × 3 1/4" OD

				1	3/4"	11 1/4"	3/8"	Silicone-Coated Fiberglass Fabric	0.016"	-60 to 450	450	No	95645K101	000000	5287K55	000000


				2	1 1/2"	22 1/2"	3/8"	Silicone-Coated Fiberglass Fabric	0.016"	-60 to 450	450	No	95645K102	000000	5287K55	00000
				3	2 1/4"	33 3/4"	3/8"	Silicone-Coated Fiberglass Fabric	0.016"	-60 to 450	450	No	95645K103	000000	5287K55	00000
				4	3"	45"	3/8"	Silicone-Coated Fiberglass Fabric	0.016"	-60 to 450	450	No	95645K104	000000	5287K55	00000




						1" ID × 3 1/2" OD

						1	3/4"	11 1/4"	3/8"	Silicone-Coated Fiberglass Fabric	0.016"	-60 to 450	450	No	95645K112	000000	5287K56	00000


						2	1 1/2"	22 1/2"	3/8"	Silicone-Coated Fiberglass Fabric	0.016"	-60 to 450	450	No	95645K113	000000	5287K56	00000
						3	2 1/4"	33 3/4"	3/8"	Silicone-Coated Fiberglass Fabric	0.016"	-60 to 450	450	No	95645K114	000000	5287K56	00000
						4	3"	45"	3/8"	Silicone-Coated Fiberglass Fabric	0.016"	-60 to 450	450	No	95645K115	000000	5287K56	00000




								1 1/2" ID × 4" OD

								1	3/4"	11 1/4"	3/8"	Silicone-Coated Fiberglass Fabric	0.016"	-60 to 450	450	No	95645K123	000000	5287K58	00000


								2	1 1/2"	22 1/2"	3/8"	Silicone-Coated Fiberglass Fabric	0.016"	-60 to 450	450	No	95645K124	000000	5287K58	00000
								3	2 1/4"	33 3/4"	3/8"	Silicone-Coated Fiberglass Fabric	0.016"	-60 to 450	450	No	95645K125	000000	5287K58	00000
								4	3"	45"	3/8"	Silicone-Coated Fiberglass Fabric	0.016"	-60 to 450	450	No	95645K126	000000	5287K58	00000




										2" ID × 4 1/2" OD

										1	3/4"	11 1/4"	3/8"	Silicone-Coated Fiberglass Fabric	0.016"	-60 to 450	450	No	95645K134	000000	5287K61	00000


										2	1 1/2"	22 1/2"	3/8"	Silicone-Coated Fiberglass Fabric	0.016"	-60 to 450	450	No	95645K135	000000	5287K61	00000
										3	2 1/4"	33 3/4"	3/8"	Silicone-Coated Fiberglass Fabric	0.016"	-60 to 450	450	No	95645K136	000000	5287K61	00000
										4	3"	45"	3/8"	Silicone-Coated Fiberglass Fabric	0.016"	-60 to 450	450	No	95645K137	000000	5287K61	00000




												3 1/4" ID × 5 3/4" OD

												1	3/4"	11 1/4"	3/8"	Silicone-Coated Fiberglass Fabric	0.016"	-60 to 450	450	No	95645K145	000000	5287K64	00000


												2	1 1/2"	22 1/2"	3/8"	Silicone-Coated Fiberglass Fabric	0.016"	-60 to 450	450	No	95645K146	000000	5287K64	00000
												3	2 1/4"	33 3/4"	3/8"	Silicone-Coated Fiberglass Fabric	0.016"	-60 to 450	450	No	95645K147	000000	5287K64	00000
												4	3"	45"	3/8"	Silicone-Coated Fiberglass Fabric	0.016"	-60 to 450	450	No	95645K148	000000	5287K64	00000




												4 1/4" ID × 6 3/4" OD

		1										3/4"	11 1/4"	3/8"	Silicone-Coated Fiberglass Fabric	0.016"	-60 to 450	450	No	95645K156	000000	5287K65	00000


		2	1 1/2"									22 1/2"	3/8"	Silicone-Coated Fiberglass Fabric	0.016"	-60 to 450	450	No	95645K157	000000	5287K65	00000
		3	2 1/4"									33 3/4"	3/8"	Silicone-Coated Fiberglass Fabric	0.016"	-60 to 450	450	No	95645K158	000000	5287K65	00000
		4	3"									45"	3/8"	Silicone-Coated Fiberglass Fabric	0.016"	-60 to 450	450	No	95645K159	000000	5287K65	00000




												6 1/4" ID × 8 3/4" OD

				1								3/4"	11 1/4"	3/8"	Silicone-Coated Fiberglass Fabric	0.016"	-60 to 450	450	No	95645K167	000000	5287K67	00000


				2	1 1/2"							22 1/2"	3/8"	Silicone-Coated Fiberglass Fabric	0.016"	-60 to 450	450	No	95645K168	000000	5287K67	00000
				3	2 1/4"							33 3/4"	3/8"	Silicone-Coated Fiberglass Fabric	0.016"	-60 to 450	450	No	95645K169	000000	5287K67	00000
				4	3"							45"	3/8"	Silicone-Coated Fiberglass Fabric	0.016"	-60 to 450	450	No	95645K171	000000	5287K67	00000