Angle Flanges | McMaster-Carr

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Number of Mounting Holes

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With Mounting Holes

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Mounting Hole Diameter

Depth

Export Control Classification Number (ECCN)

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DFARS Specialty Metals

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Performance

Duct Type

197 Products

Component

Adapter

Bridge the gap between different types and shapes of duct

28 products

Flange

Mount to air handlers and HVAC equipment to start a run of duct

169 products

Duct Type

Clamp Together

The fastest ductwork to install and disassemble

28 products

Plastic

Withstand chemicals that would break down most metal duct

7 products

Duct Flanges

Mount flanges to air handlers and HVAC equipment to start a run of duct. They also create a secure joint between sections of duct—attach a flange to each piece. Also known as angle rings.

With Mounting Holes—Ready to install, these flanges secure with screws.

Without Mounting Holes—Drill your own holes or weld into place.

Steel—Strong for a long life, these steel flanges can be painted or coated. Unless it’s finished, steel is best for dry environments.

Galvanized Steel—Corrosion resistant and affordable, galvanized steel is the most commonly used ductwork material.

Corrosion-Resistant 304 Stainless Steel—The most corrosion-resistant metal duct we sell. It won’t rust or degrade in systems that exhaust chemical fumes or vent heat from industrial ovens and dryers.

Lightweight Aluminum—One-third the weight of steel, aluminum ductwork is easier to handle during installation. Like galvanized steel, it resists rust in wet environments but won’t last as long.

PVC—Withstand chemicals that would eat away at most metal duct. It’s often used in systems that exhaust corrosive gases, vapors, and fumes.

				Flange		Mounting
	Duct Size	ID	Overall Dp.	Ht.	Thk.	Fasteners Included	No. of Holes	Hole Dia.		Each
With Mounting Holes







				Steel

				3	3 1/16"	1"	1"	1/8"	No	6	9/32"	0000000	00000


				3 1/2	3 9/16"	1"	1"	9/64"	No	6	9/32"	0000000	00000
				4	4 1/16"	1"	1"	1/8"	No	6	9/32"	0000000	00000
				4 1/2	4 9/16"	1"	1"	9/64"	No	6	9/32"	0000000	00000
				5	5 1/16"	1"	1"	1/8"	No	6	9/32"	0000000	00000
				5 1/2	5 9/16"	1"	1"	9/64"	No	6	9/32"	0000000	00000
				6	6 1/8"	1 1/4"	1 1/4"	1/8"	No	6	3/8"	0000000	00000
				7	7 1/8"	1 1/4"	1 1/4"	1/8"	No	6	3/8"	0000000	00000
				8	8 1/8"	1 1/4"	1 1/4"	1/8"	No	6	3/8"	0000000	00000
				9	9 1/8"	1 1/4"	1 1/4"	1/8"	No	6	3/8"	0000000	00000
				10	10 1/8"	1 1/4"	1 1/4"	1/8"	No	6	3/8"	0000000	00000


				11	11 1/8"	1 1/4"	1 1/4"	1/8"	No	6	3/8"	0000000	00000
				12	12 1/8"	1 1/2"	1 1/2"	1/8"	No	8	7/16"	0000000	00000
				13	13 1/8"	1 1/2"	1 1/2"	1/8"	No	8	7/16"	0000000	00000
				14	14 1/8"	1 1/2"	1 1/2"	1/8"	No	8	7/16"	0000000	00000
				15	15 1/8"	1 1/2"	1 1/2"	1/8"	No	8	7/16"	0000000	00000
				16	16 1/8"	1 1/2"	1 1/2"	3/16"	No	8	7/16"	0000000	00000
				17	17 1/8"	1 1/2"	1 1/2"	3/16"	No	8	7/16"	0000000	00000
				18	18 1/8"	1 1/2"	1 1/2"	3/16"	No	8	7/16"	0000000	00000
				19	19 1/8"	1 1/2"	1 1/2"	3/16"	No	12	7/16"	00000000	00000
				20	20 1/8"	1 1/2"	1 1/2"	3/16"	No	12	7/16"	0000000	00000


				21	21 1/8"	1 1/2"	1 1/2"	3/16"	No	12	7/16"	0000000	00000
				22	22 1/8"	1 1/2"	1 1/2"	3/16"	No	12	7/16"	0000000	00000
				23	23 1/8"	1 1/2"	1 1/2"	3/16"	No	12	7/16"	0000000	00000
				24	24 1/8"	1 1/2"	1 1/2"	3/16"	No	12	7/16"	0000000	00000
				25	25 1/8"	1 1/2"	1 1/2"	3/16"	No	16	7/16"	0000000	00000
				26	26 1/8"	2"	2"	3/16"	No	16	7/16"	0000000	00000
				27	27 1/8"	2"	2"	3/16"	No	16	7/16"	0000000	00000
				28	28 1/8"	2"	2"	3/16"	No	16	7/16"	0000000	00000
				29	29 1/8"	2"	2"	3/16"	No	16	7/16"	0000000	00000
				30	30 1/8"	2"	2"	3/16"	No	16	7/16"	0000000	00000


				32	32 1/8"	2"	2"	3/16"	No	16	7/16"	0000000	00000
				34	34 1/8"	2"	2"	3/16"	No	16	7/16"	0000000	00000
				36	36 1/8"	2"	2"	3/16"	No	16	7/16"	00000000	00000
				38	38 1/8"	2"	2"	3/16"	No	24	7/16"	00000000	00000
				40	40 1/8"	2"	2"	3/16"	No	24	7/16"	00000000	000000
				42	42 1/8"	2"	2"	3/16"	No	24	7/16"	00000000	000000
				44	44 1/8"	2"	2"	3/16"	No	24	7/16"	00000000	000000
				46	46 1/8"	2"	2"	3/16"	No	24	7/16"	00000000	000000
				48	48 1/8"	2"	2"	3/16"	No	24	7/16"	00000000	000000
				52	52 1/8"	2"	2"	3/16"	No	24	7/16"	00000000	000000




						Galvanized Steel

3						3 1/16"	1"	1"	1/8"	No	6	9/32"	0000000	00000


3 1/2	3 17/32"					1"	1"	9/64"	No	6	9/32"	00000000	00000
4	4 1/16"					1"	1"	1/8"	No	6	9/32"	0000000	00000
4 1/2	4 17/32"	1"				1"	9/64"	No	6	9/32"	00000000	00000
5	5 1/16"	1"	1"			1/8"	No	6	9/32"	0000000	00000
5 1/2	5 17/32"	1"	1"			9/64"	No	6	9/32"	00000000	00000
6	6 1/8"	1 1/4"	1 1/4"			1/8"	No	6	3/8"	0000000	00000
7	7 1/8"	1 1/4"	1 1/4"			1/8"	No	6	3/8"	0000000	00000
8	8 1/8"	1 1/4"	1 1/4"			1/8"	No	6	3/8"	0000000	00000
9	9 1/8"	1 1/4"	1 1/4"			1/8"	No	6	3/8"	0000000	00000
10	10 1/8"	1 1/4"	1 1/4"			1/8"	No	6	3/8"	0000000	00000


11	11 1/8"	1 1/4"	1 1/4"			1/8"	No	6	3/8"	0000000	00000
12	12 1/8"	1 1/2"	1 1/2"			1/8"	No	8	7/16"	0000000	00000
13	13 1/8"	1 1/2"	1 1/2"			1/8"	No	8	7/16"	0000000	00000
14	14 1/8"	1 1/2"	1 1/2"			1/8"	No	8	7/16"	0000000	00000
15	15 1/8"	1 1/2"	1 1/2"			1/8"	No	8	7/16"	0000000	00000
16	16 1/8"	1 1/2"	1 1/2"			3/16"	No	8	7/16"	0000000	00000
17	17 3/16"	1 1/2"	1 1/2"			3/16"	No	8	7/16"	0000000	00000
18	18 1/8"	1 1/2"	1 1/2"			3/16"	No	8	7/16"	0000000	00000
20	20 1/8"	1 1/2"	1 1/2"			3/16"	No	12	7/16"	0000000	00000
21	21 3/16"	1 1/2"	1 1/2"			3/16"	No	12	7/16"	0000000	00000


22	22 1/8"	1 1/2"	1 1/2"			3/16"	No	12	7/16"	0000000	00000
23	23 3/16"	1 1/2"	1 1/2"			3/16"	No	12	7/16"	0000000	00000
24	24 1/8"	1 1/2"	1 1/2"			3/16"	No	12	7/16"	0000000	00000
26	26 1/8"	2"	2"			3/16"	No	16	7/16"	0000000	000000
28	28 1/8"	2"	2"			3/16"	No	16	7/16"	0000000	000000
30	30 1/8"	2"	2"			3/16"	No	16	7/16"	0000000	000000
34	34 3/16"	2"	2"			3/16"	No	16	7/16"	0000000	000000
36	36 3/16"	2"	2"			3/16"	No	16	7/16"	0000000	000000
38	38 3/16"	2"	2"			3/16"	No	24	7/16"	0000000	000000
40	40 3/16"	2"	2"			3/16"	No	24	7/16"	0000000	000000




		Corrosion-Resistant 304 Stainless Steel

		3	3 1/16"			7/8"	1"	1/8"	No	6	9/32"	0000000	00000


		3 1/2	3 9/16"			1"	1"	9/64"	No	6	9/32"	00000000	00000
		4	4 1/16"			1"	1"	1/8"	No	6	9/32"	0000000	00000
		4 1/2	4 9/16"			1"	1"	9/64"	No	6	9/32"	00000000	00000
		5	5 1/16"			1"	1"	1/8"	No	6	9/32"	0000000	00000
		5 1/2	5 9/16"			1"	1"	9/64"	No	6	9/32"	00000000	00000
		6	6 1/8"			1 1/4"	1 1/4"	1/8"	No	6	3/8"	0000000	00000
		7	7 1/8"			1 1/4"	1 1/4"	1/8"	No	6	3/8"	0000000	00000
		8	8 1/8"			1 1/4"	1 1/4"	1/8"	No	6	3/8"	0000000	00000
		9	9 1/8"			1 1/4"	1 1/4"	1/8"	No	6	3/8"	0000000	00000
		10	10 1/8"			1 1/4"	1 1/4"	1/8"	No	6	3/8"	0000000	00000


		11	11 1/8"			1 1/4"	1 1/4"	1/8"	No	6	3/8"	0000000	00000
		12	12 1/8"			1 1/2"	1 1/2"	1/8"	No	8	7/16"	0000000	00000
		13	13 1/8"			1 1/2"	1 1/2"	1/8"	No	8	7/16"	0000000	00000
		14	14 1/8"	1 1/2"		1 1/2"	1/8"	No	8	7/16"	0000000	00000
		15	15 1/8"	1 1/2"	1 1/2"	1/8"	No	8	7/16"	0000000	00000
		16	16 1/8"	1 1/2"	1 1/2"	3/16"	No	8	7/16"	0000000	000000
		18	18 1/8"	1 1/2"	1 1/2"	3/16"	No	8	7/16"	0000000	000000
		19	19 1/8"	1 1/2"	1 1/2"	3/16"	No	12	7/16"	00000000	000000
		20	20 1/8"	1 1/2"	1 1/2"	3/16"	No	12	7/16"	0000000	000000
		22	22 1/8"	1 1/2"	1 1/2"	3/16"	No	12	7/16"	0000000	000000


		24	24 1/8"	1 1/2"	1 1/2"	3/16"	No	12	7/16"	0000000	000000
		26	26 1/8"	2"	2"	3/16"	No	16	7/16"	0000000	000000
		28	28 1/8"	2"	2"	3/16"	No	16	7/16"	0000000	000000
		30	30 1/8"	2"	2"	3/16"	No	16	7/16"	0000000	000000
		32	32 1/8"	2"	2"	3/16"	No	16	7/16"	00000000	000000
		36	36 1/8"	2"	2"	3/16"	No	16	7/16"	00000000	000000
		38	38 1/8"	2"	2"	3/16"	No	24	7/16"	00000000	000000
		40	40 1/8"	2"	2"	3/16"	No	24	7/16"	00000000	000000




				Lightweight Aluminum

				3	3 1/16"	1"	1"	7/64"	No	6	9/32"	0000000	00000


				3 1/2	3 9/16"	1"	1"	7/64"	No	6	9/32"	0000000	00000
				4	4 1/16"	1"	1"	7/64"	No	6	9/32"	0000000	00000
				4 1/2	4 9/16"	1"	1"	7/64"	No	6	9/32"	0000000	00000
				5	5 1/16"	1"	1"	7/64"	No	6	9/32"	0000000	00000
				5 1/2	5 9/16"	1"	1"	7/64"	No	6	9/32"	0000000	00000
				6	6 1/8"	1 1/4"	1 1/4"	1/8"	No	6	3/8"	0000000	00000
				7	7 1/8"	1 1/4"	1 1/4"	1/8"	No	6	3/8"	0000000	00000
				8	8 1/8"	1 1/4"	1 1/4"	1/8"	No	6	3/8"	0000000	00000
				9	9 1/8"	1 1/4"	1 1/4"	1/8"	No	6	3/8"	0000000	00000
				10	10 1/8"	1 1/4"	1 1/4"	1/8"	No	6	3/8"	0000000	00000


				11	11 1/8"	1 1/4"	1 1/4"	1/8"	No	6	3/8"	0000000	00000
				12	12 1/8"	1 1/2"	1 1/2"	1/8"	No	8	7/16"	0000000	00000
				13	13 1/8"	1 1/2"	1 1/2"	1/8"	No	8	7/16"	0000000	00000
				14	14 1/8"	1 1/2"	1 1/2"	1/8"	No	8	7/16"	0000000	00000
16				16 1/8"	1 1/2"	1 1/2"	3/16"	No	8	7/16"	0000000	00000
18	18 1/8"			1 1/2"	1 1/2"	3/16"	No	8	7/16"	0000000	00000
20	20 1/8"			1 1/2"	1 1/2"	3/16"	No	12	7/16"	0000000	00000
24	24 1/8"			1 1/2"	1 1/2"	3/16"	No	12	7/16"	0000000	000000
26	26 1/8"			2"	2"	3/16"	No	16	7/16"	0000000	000000




				PVC

				4	4 1/2"	2 1/4"	1 7/8"	1/4"	No	4	5/16"	000000	00000


				6	6 5/8"	3 1/4"	1 1/2"	1/4"	No	8	5/16"	0000000	00000
				8	8 5/8"	3 1/4"	1 1/2"	1/4"	No	10	5/16"	0000000	00000
				10	10 3/4"	3 1/4"	1 3/8"	1/4"	No	12	5/16"	0000000	000000
				12	12 3/4"	3 1/2"	1 3/8"	1/4"	No	16	5/16"	0000000	000000
				14	14"	3 1/2"	1 3/4"	1/4"	No	16	5/16"	0000000	000000
				16	16"	3 1/2"	1 3/4"	1/4"	No	18	5/16"	0000000	000000


				Without Mounting Holes







								Steel

								3	3 1/16"	1"	1"	1/8"	—	—	—	0000000	0000


								4	4 1/16"	1"	1"	1/8"	—	—	—	0000000	00000
								5	5 1/16"	1"	1"	1/8"	—	—	—	0000000	00000
								6	6 1/8"	1 1/4"	1 1/4"	1/8"	—	—	—	0000000	00000
								7	7 1/8"	1 1/4"	1 1/4"	1/8"	—	—	—	0000000	00000
								8	8 1/8"	1 1/4"	1 1/4"	1/8"	—	—	—	0000000	00000
								9	9 1/8"	1 1/4"	1 1/4"	1/8"	—	—	—	0000000	00000
		10						10 1/8"	1 1/4"	1 1/4"	1/8"	—	—	—	0000000	00000
		11	11 1/8"					1 1/4"	1 1/4"	1/8"	—	—	—	0000000	00000
		12	12 1/8"					1 1/2"	1 1/2"	1/8"	—	—	—	0000000	00000
		13	13 1/8"					1 1/2"	1 1/2"	1/8"	—	—	—	0000000	00000


		14	14 1/8"					1 1/2"	1 1/2"	1/8"	—	—	—	0000000	00000
		15	15 1/8"					1 1/2"	1 1/2"	1/8"	—	—	—	0000000	00000
		16	16 1/8"					1 1/2"	1 1/2"	3/16"	—	—	—	0000000	00000
		18	18 1/8"					1 1/2"	1 1/2"	3/16"	—	—	—	0000000	00000
		20	20 1/8"					1 1/2"	1 1/2"	3/16"	—	—	—	0000000	00000
		22	22 1/8"					1 1/2"	1 1/2"	3/16"	—	—	—	0000000	00000
		24	24 1/8"					1 1/2"	1 1/2"	3/16"	—	—	—	0000000	00000
		26	26 1/8"					2"	2"	3/16"	—	—	—	0000000	00000
		28	28 1/8"					2"	2"	3/16"	—	—	—	0000000	00000
		30	30 1/8"					2"	2"	3/16"	—	—	—	0000000	00000




								Corrosion-Resistant 304 Stainless Steel

								4	4 1/16"	1"	1"	1/8"	—	—	—	0000000	00000


								5	5 1/16"	1"	1"	1/8"	—	—	—	0000000	00000
								6	6 1/8"	1 1/4"	1 1/4"	1/8"	—	—	—	0000000	00000
								7	7 1/8"	1 1/4"	1 1/4"	1/8"	—	—	—	0000000	00000
								8	8 1/8"	1 1/4"	1 1/4"	1/8"	—	—	—	0000000	00000
								9	9 1/8"	1 1/4"	1 1/4"	1/8"	—	—	—	0000000	00000
10								10 1/8"	1 1/4"	1 1/4"	1/8"	—	—	—	0000000	00000
11	11 1/8"							1 1/4"	1 1/4"	1/8"	—	—	—	0000000	00000
12	12 1/8"							1 1/2"	1 1/2"	1/8"	—	—	—	0000000	00000
13	13 1/8"							1 1/2"	1 1/2"	1/8"	—	—	—	0000000	00000
14	14 1/8"							1 1/2"	1 1/2"	1/8"	—	—	—	0000000	00000


15	15 1/8"							1 1/2"	1 1/2"	1/8"	—	—	—	0000000	00000
16	16 1/8"							1 1/2"	1 1/2"	3/16"	—	—	—	0000000	000000
18	18 1/8"							1 1/2"	1 1/2"	3/16"	—	—	—	0000000	000000
20	20 1/8"							1 1/2"	1 1/2"	3/16"	—	—	—	0000000	000000
22	22 1/8"							1 1/2"	1 1/2"	3/16"	—	—	—	0000000	000000
24	24 1/8"							1 1/2"	1 1/2"	3/16"	—	—	—	0000000	000000
26	26 1/8"							2"	2"	3/16"	—	—	—	0000000	000000
28	28 1/8"							2"	2"	3/16"	—	—	—	0000000	000000
30	30 1/8"							2"	2"	3/16"	—	—	—	0000000	000000

Quick-Disconnect Duct and Fittings

The fastest ductwork to disassemble for dust collection and other frequently cleaned systems. Join sections with quick-release clamps that open and close with a flip of the latch. Since you don’t need screws, welds, or tools, the installation time is half that of other duct types.

Straight Adapters

Duct-to-Duct

Flanged

Adapter

Bridge the gap between quick disconnect and other types of duct. These adapters mate with standard and spiral round duct, flanged duct fittings, or duct hose.

Duct-to-Duct Flanged Adapter—The flange joins quick-disconnect duct to fittings that have a flanged connection.

Galvanized Steel—Corrosion resistant and affordable, galvanized steel is the most commonly used ductwork material.

				Galvanized Steel		Corrosion-Resistant 304 Stainless Steel
	Duct Size	ID	Ga.		Each		Each
Duct-to-Duct Flanged Adapter



		3	3 1/16"	22	00000000	000000	00000000	0000000


		4	3 7/8"	22	00000000	00000	00000000	000000
		5	4 7/8"	22	00000000	00000	00000000	000000
		6	5 7/8"	22	00000000	00000	00000000	000000
		7	6 7/8"	22	00000000	000000	00000000	000000
		8	7 7/8"	22	00000000	000000	00000000	000000
		9	8 7/8"	22	00000000	000000	00000000	000000
		10	9 7/8"	22	00000000	000000	00000000	000000
		12	12"	22	00000000	000000	00000000	000000
		14	13 15/16"	20	00000000	000000	00000000	000000
		16	15 15/16"	20	00000000	000000	00000000	000000


		18	17 15/16"	20	00000000	000000	00000000	000000
		20	19 15/16"	20	00000000	000000	00000000	000000
		22	22"	20	00000000	000000	———	0
		24	23 15/16"	20	00000000	000000	———	0