Spiral Pipe Elbows | McMaster-Carr

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REACH

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Export Control Classification Number (ECCN)

2B999

EAR99

DFARS Specialty Metals

Seam Construction

129 Products

Duct Type

Standard

Our basic duct for a range of HVAC applications

77 products

Spiral

A continuous seam reinforces duct for strength and long life

52 products

Performance

Tight Seal

Gasketed fittings prevent leaks between connections

10 products

Corrosion Resistant

Won't rust in wet environments

113 products

Standard Duct and Fittings

Deliver air for a range of HVAC applications, including exhaust and dust collection. Our basic duct, the round shape creates smoother, more efficient airflow than rectangular and oval duct. The male end is slightly smaller than the female, so sections join without clamps or tools.

90° Elbow Connectors

Change the direction of airflow when joining lengths of duct.

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.

					Galvanized Steel		Corrosion-Resistant 304 Stainless Steel
Duct Size	ID	OD	Seam Construction	Ga.		Each		Each



	3	3"	2 7/8"	Welded	20	0000000	0000000	00000000	0000000


	4	4"	3 7/8"	Welded	20	0000000	000000	00000000	000000
	5	5"	4 7/8"	Welded	20	0000000	000000	00000000	000000
	6	6"	5 7/8"	Welded	20	0000000	000000	00000000	000000
	7	7"	6 7/8"	Welded	20	0000000	000000	00000000	000000
	8	8"	7 7/8"	Welded	20	0000000	000000	00000000	000000
	10	10"	9 7/8"	Welded	20	0000000	000000	00000000	000000
	12	12"	11 7/8"	Welded	20	0000000	000000	00000000	000000

45° Elbow Connectors

Welded Seam

Riveted Seam

Change the direction of airflow when joining lengths of duct.

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	OD	Seam Construction	Ga.		Each		Each



	3	3"	2 7/8"	Welded	20	0000000	000000	00000000	0000000


	4	4"	3 7/8"	Welded	20	0000000	000000	00000000	000000
	5	5"	4 7/8"	Welded	20	0000000	000000	00000000	000000
	6	6"	5 7/8"	Welded	20	0000000	000000	00000000	000000
	7	7"	6 7/8"	Welded	20	0000000	000000	00000000	000000
	8	8"	7 7/8"	Welded	20	0000000	000000	00000000	000000
	10	10"	9 7/8"	Welded	20	0000000	000000	00000000	000000
	12	12"	11 7/8"	Welded	20	0000000	000000	00000000	000000
	18	18"	17 7/8"	Riveted	24	00000000	000000	———	0
	20	20"	19 7/8"	Riveted	24	00000000	000000	———	0
	22	22"	21 7/8"	Riveted	24	00000000	000000	———	0


	24	24"	23 7/8"	Riveted	24	00000000	000000	———	0

Adjustable-Angle-Elbow Connectors (Adjusts from Straight to 90°)

Image of Product. Front orientation. Duct and Fittings. Standard Duct and Fittings, Adjustable-Angle-Elbow Connectors (Adjusts from Straight to 90°).

Use these connectors as an angled or straight link between pieces of duct. Adjust the shape by twisting the segments.

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

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.

				Galvanized Steel		Corrosion-Resistant 304 Stainless Steel		Lightweight Aluminum
Duct Size	ID	OD	Ga.		Each		Each		Each



	3	3"	2 7/8"	26	0000000	000000	0000000	000000	0000000	00000


	4	4"	3 7/8"	26	0000000	00000	0000000	00000	0000000	0000
	5	5"	4 7/8"	26	0000000	00000	0000000	00000	0000000	00000
	6	6"	5 7/8"	26	0000000	00000	0000000	00000	0000000	00000
	7	7"	6 7/8"	26	0000000	00000	0000000	00000	0000000	00000
	8	8"	7 7/8"	26	0000000	00000	0000000	000000	0000000	00000
	9	9"	8 7/8"	26	0000000	00000	———	0	———	0
	10	10"	9 7/8"	26	0000000	00000	0000000	000000	0000000	00000
	12	12"	11 7/8"	26	0000000	00000	0000000	000000	0000000	00000
	14	14"	13 7/8"	24	0000000	00000	———	0	———	0
	16	16"	15 7/8"	24	0000000	000000	———	0	———	0


	18	18"	17 7/8"	24	0000000	000000	———	0	———	0
	20	20"	19 7/8"	24	0000000	000000	———	0	———	0
	24	24"	23 7/8"	24	0000000	000000	———	0	———	0

Adjustable-Angle-Elbow Connectors (Adjusts from Straight to 45°)

Image of Product. Front orientation. Duct and Fittings. Standard Duct and Fittings, Adjustable-Angle-Elbow Connectors (Adjusts from Straight to 45°).

Use these connectors as an angled or straight link between pieces of duct. Adjust the shape by twisting the segments.

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

				Galvanized Steel
Duct Size	ID	OD	Ga.		Each



	3	3"	2 7/8"	26	00000000	000000


	4	4"	3 7/8"	26	00000000	00000
	5	5"	4 7/8"	26	00000000	00000
	6	6"	5 7/8"	26	00000000	00000
	7	7"	6 7/8"	26	00000000	00000
	8	8"	7 7/8"	26	00000000	00000
	9	9"	8 7/8"	26	00000000	00000
	10	10"	9 7/8"	26	00000000	00000
	12	12"	11 7/8"	26	00000000	00000
	14	14"	13 7/8"	24	00000000	00000
	16	16"	15 7/8"	24	00000000	00000

Spiral Duct and Fittings

Reinforced with a continuous seam, this duct keeps its shape, even against suction from dust collection systems. On the inside, duct is smooth for efficient airflow. Because of its attractive look, spiral duct is often used for exposed heating and cooling systems.

90° Elbow Connectors

Change the direction of airflow when joining lengths of duct.

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

Chemical-Resistant PVC-Coated Steel—This duct combines the strength of steel with the chemical resistance of plastic. More economical than 304 stainless steel and stronger than PVC, it’s often used to exhaust corrosive gases, vapors, and fumes.

		Galvanized Steel			Chemical-Resistant PVC-Coated Steel			Corrosion-Resistant 304 Stainless Steel
Duct Size	OD	Ga.		Each	Ga.		Each	Ga.		Each
3	2 7/8"	24	0000000	000000	—	———	0	—	———	0
4	3 7/8"	24	0000000	00000	24	00000000	000000	20	0000000	0000000
5	4 7/8"	24	0000000	00000	24	00000000	000000	—	———	0
6	5 7/8"	24	0000000	00000	24	00000000	000000	20	0000000	000000
7	6 7/8"	—	———	0	24	00000000	000000	—	———	0
8	7 7/8"	24	0000000	00000	24	00000000	000000	20	0000000	000000
9	8 7/8"	—	———	0	24	00000000	000000	—	———	0
10	9 7/8"	24	0000000	00000	24	00000000	000000	20	0000000	000000
12	11 7/8"	24	0000000	000000	24	00000000	000000	—	———	0
14	13 7/8"	24	0000000	000000	—	———	0	—	———	0
16	15 7/8"	24	0000000	000000	—	———	0	—	———	0

45° Elbow Connectors

Change the direction of airflow when joining lengths of duct.

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

		Galvanized Steel			Chemical-Resistant PVC-Coated Steel			Corrosion-Resistant 304 Stainless Steel
Duct Size	OD	Ga.		Each	Ga.		Each	Ga.		Each
3	2 7/8"	24	00000000	000000	—	———	0	—	———	0
4	3 7/8"	24	00000000	00000	24	00000000	000000	20	0000000	0000000
5	4 7/8"	24	00000000	00000	24	00000000	00000	—	———	0
6	5 7/8"	24	00000000	00000	24	00000000	00000	20	0000000	000000
7	6 7/8"	—	———	0	24	00000000	00000	—	———	0
8	7 7/8"	24	00000000	00000	24	00000000	00000	20	0000000	000000
9	8 7/8"	—	———	0	24	00000000	000000	—	———	0
10	9 7/8"	24	00000000	00000	24	00000000	000000	20	0000000	000000
12	11 7/8"	24	00000000	00000	24	00000000	000000	—	———	0
14	13 7/8"	24	00000000	00000	—	———	0	—	———	0
16	15 7/8"	24	00000000	000000	—	———	0	—	———	0

Tight-Seal Spiral Duct and Fittings

Gasketed fittings prevent leaks between connections without the need for tape or other sealants. Duct has a continuous seam that reinforces it for strength and long life. The rigid construction keeps its shape, even against suction from dust collectors. Duct is smooth on the inside for efficient airflow. Because of its attractive look, spiral duct is often used for exposed heating and cooling systems.

90° Elbow Connectors

Change the direction of airflow when joining lengths of duct.

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

		Galvanized Steel with EPDM Gasket
Duct Size	OD	Ga.		Each
4	3 7/8"	24	0000000	000000
6	5 7/8"	24	0000000	00000
8	7 7/8"	24	0000000	00000
10	9 7/8"	24	0000000	00000
12	11 7/8"	24	0000000	00000

45° Elbow Connectors

Change the direction of airflow when joining lengths of duct.

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

		Galvanized Steel with EPDM Gasket
Duct Size	OD	Ga.		Each
4	3 7/8"	24	0000000	000000
6	5 7/8"	24	0000000	00000
8	7 7/8"	24	0000000	00000
10	9 7/8"	24	0000000	00000
12	11 7/8"	24	0000000	00000