Spiral Pipe Elbows | McMaster-Carr

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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	1768K88	0000000	1768K152	0000000


	4	4"	3 7/8"	Welded	20	1768K89	000000	17805K73	000000
	5	5"	4 7/8"	Welded	20	1768K91	000000	17805K74	000000
	6	6"	5 7/8"	Welded	20	1768K92	000000	17805K75	000000
	7	7"	6 7/8"	Welded	20	1768K93	000000	17805K76	000000
	8	8"	7 7/8"	Welded	20	1768K94	000000	17805K77	000000
	10	10"	9 7/8"	Welded	20	1768K95	000000	17805K78	000000
	12	12"	11 7/8"	Welded	20	1768K96	000000	17805K79	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	1768K71	000000	1768K154	0000000


	4	4"	3 7/8"	Welded	20	1768K72	000000	17805K53	000000
	5	5"	4 7/8"	Welded	20	1768K73	000000	17805K54	000000
	6	6"	5 7/8"	Welded	20	1768K74	000000	17805K55	000000
	7	7"	6 7/8"	Welded	20	1768K75	000000	17805K56	000000
	8	8"	7 7/8"	Welded	20	1768K76	000000	17805K57	000000
	10	10"	9 7/8"	Welded	20	1768K77	000000	17805K58	000000
	12	12"	11 7/8"	Welded	20	1768K78	000000	17805K59	000000
	18	18"	17 7/8"	Riveted	24	1766K883	000000	———	0
	20	20"	19 7/8"	Riveted	24	1766K884	000000	———	0
	22	22"	21 7/8"	Riveted	24	1766K231	000000	———	0


	24	24"	23 7/8"	Riveted	24	1766K889	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	1766K31	000000	1767K21	000000	1773K21	00000


	4	4"	3 7/8"	26	1766K32	00000	1767K22	00000	1773K22	0000
	5	5"	4 7/8"	26	1766K33	00000	1767K23	00000	1773K23	00000
	6	6"	5 7/8"	26	1766K34	00000	1767K24	00000	1773K24	00000
	7	7"	6 7/8"	26	1766K35	00000	1767K25	00000	1773K25	00000
	8	8"	7 7/8"	26	1766K36	00000	1767K26	000000	1773K26	00000
	9	9"	8 7/8"	26	1766K37	00000	———	0	———	0
	10	10"	9 7/8"	26	1766K38	00000	1767K27	000000	1773K28	00000
	12	12"	11 7/8"	26	1766K39	00000	1767K28	000000	1773K29	00000
	14	14"	13 7/8"	24	1766K41	00000	———	0	———	0
	16	16"	15 7/8"	24	1766K42	000000	———	0	———	0


	18	18"	17 7/8"	24	1766K43	000000	———	0	———	0
	20	20"	19 7/8"	24	1766K44	000000	———	0	———	0
	24	24"	23 7/8"	24	1766K46	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	1766K871	000000


	4	4"	3 7/8"	26	1766K872	00000
	5	5"	4 7/8"	26	1766K873	00000
	6	6"	5 7/8"	26	1766K874	00000
	7	7"	6 7/8"	26	1766K875	00000
	8	8"	7 7/8"	26	1766K876	00000
	9	9"	8 7/8"	26	1766K877	00000
	10	10"	9 7/8"	26	1766K878	00000
	12	12"	11 7/8"	26	1766K879	00000
	14	14"	13 7/8"	24	1766K881	00000
	16	16"	15 7/8"	24	1766K882	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	5078K23	000000	—	———	0	—	———	0
4	3 7/8"	24	5078K24	00000	24	1889K351	000000	20	2561K15	0000000
5	4 7/8"	24	5078K26	00000	24	1889K352	000000	—	———	0
6	5 7/8"	24	5078K27	00000	24	1889K353	000000	20	2561K16	000000
7	6 7/8"	—	———	0	24	1889K354	000000	—	———	0
8	7 7/8"	24	5078K29	00000	24	1889K355	000000	20	2561K17	000000
9	8 7/8"	—	———	0	24	1889K356	000000	—	———	0
10	9 7/8"	24	5078K31	00000	24	1889K357	000000	20	2561K18	000000
12	11 7/8"	24	5078K32	000000	24	1889K359	000000	—	———	0
14	13 7/8"	24	5078K87	000000	—	———	0	—	———	0
16	15 7/8"	24	5078K89	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	5078K771	000000	—	———	0	—	———	0
4	3 7/8"	24	5078K772	00000	24	1889K341	000000	20	2561K19	0000000
5	4 7/8"	24	5078K773	00000	24	1889K342	00000	—	———	0
6	5 7/8"	24	5078K774	00000	24	1889K343	00000	20	2561K21	000000
7	6 7/8"	—	———	0	24	1889K344	00000	—	———	0
8	7 7/8"	24	5078K776	00000	24	1889K345	00000	20	2561K22	000000
9	8 7/8"	—	———	0	24	1889K346	000000	—	———	0
10	9 7/8"	24	5078K778	00000	24	1889K347	000000	20	2561K23	000000
12	11 7/8"	24	5078K779	00000	24	1889K348	000000	—	———	0
14	13 7/8"	24	5078K781	00000	—	———	0	—	———	0
16	15 7/8"	24	5078K782	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	2226K11	000000
6	5 7/8"	24	2226K12	00000
8	7 7/8"	24	2226K13	00000
10	9 7/8"	24	2226K14	00000
12	11 7/8"	24	2226K43	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	2226K15	000000
6	5 7/8"	24	2226K16	00000
8	7 7/8"	24	2226K17	00000
10	9 7/8"	24	2226K18	00000
12	11 7/8"	24	2226K44	00000