Spiral Duct Fittings | McMaster-Carr

	Shape Shape


Straight	90° Elbow

45° Elbow	Wye

Tee	Cap

	Duct Size Duct Size

	Material Material

Steel

Stainless Steel

	Finish Finish

Galvanized

PVC Coated

	Component Component

	ID ID

	OD OD

	Gauge Gauge

	Gender Gender

Male

Female

	End Construction End Construction

	DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense Acquisition Regulations Supplement)

DFARS Specialty Metals
COTS-Exempt

	RoHS (Restriction of Hazardous Substances) RoHS (Restriction of Hazardous Substances)

RoHS Compliant

	REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) REACH (Registration, Evaluation, Authorization and Restriction of Chemicals)

REACH Compliant

	Gasket Material Gasket Material

Rubber

Foam

	Length Length

240 Products

About Duct Connections

A spiral seam makes this duct strong and rigid. Fittings have male ends with a slightly smaller diameter to press-fit into duct.

Galvanized steel has good corrosion resistance. PVC-coated steel combines the strength of steel with the corrosion resistance of plastic. 304 stainless steel is more corrosion resistant than steel.

For technical drawings and 3-D models, click on a part number.

Duct

			Galvanized Steel				PVC-Coated Steel			304 Stainless Steel
Duct Size	Female ID	End Construction	Gauge		2 ft.	5 ft.	Gauge		5 ft.	Gauge		2 ft.	5 ft.
3	3"	Plain	26	0000000	00	000000	__	000000	00	__	000000	00	00
4	4"	Plain	26	00000000	000000	00000	26	00000000	000000	24	00000000	000000	000000
5	5"	Plain	26	00000000	00000	00000	26	00000000	000000	__	000000	00	00
6	6"	Plain	26	00000000	00000	00000	26	00000000	000000	24	00000000	00000	000000
7	7"	Plain	__	000000	00	00	26	00000000	000000	__	000000	00	00
8	8"	Plain	26	00000000	00000	00000	26	00000000	000000	24	00000000	00000	000000
9	9"	Plain	__	000000	00	00	26	00000000	000000	__	000000	00	00
10	10"	Plain	26	00000000	00000	00000	26	00000000	000000	24	00000000	000000	000000
12	12"	Plain	26	00000000	00000	00000	26	00000000	000000	__	000000	00	00
14	14"	Plain	24	00000000	00000	000000	__	000000	00	__	000000	00	00
16	16"	Plain	24	00000000	00000	000000	__	000000	00	__	000000	00	00

90° Elbow Connectors

Galvanized Steel
Duct Size	Male OD	Gauge	End Construction		Each
3	2 7/8"	24	Spiral	0000000	000000
4	3 7/8"	24	Spiral	0000000	00000
5	4 7/8"	24	Spiral	0000000	00000
6	5 7/8"	24	Spiral	0000000	00000
8	7 7/8"	24	Spiral	0000000	00000
10	9 7/8"	24	Spiral	0000000	00000
12	11 7/8"	24	Spiral	0000000	000000
14	13 7/8"	24	Spiral	0000000	000000
16	15 7/8"	24	Spiral	0000000	000000
PVC-Coated Steel
4	3 7/8"	24	Plain	00000000	00000
5	4 7/8"	24	Plain	00000000	00000
6	5 7/8"	24	Plain	00000000	000000
7	6 7/8"	24	Plain	00000000	000000
8	7 7/8"	24	Plain	00000000	000000
9	8 7/8"	24	Plain	00000000	000000
10	9 7/8"	24	Plain	00000000	000000
12	11 7/8"	24	Plain	00000000	000000
304 Stainless Steel
4	3 7/8"	20	Plain	0000000	00000
6	5 7/8"	20	Plain	0000000	000000
8	7 7/8"	20	Plain	0000000	000000
10	9 7/8"	20	Plain	0000000	000000

45° Elbow Connectors

Galvanized Steel
Duct Size	Male OD	Gauge	End Construction		Each
3	2 7/8"	24	Spiral	00000000	000000
4	3 7/8"	24	Spiral	00000000	00000
5	4 7/8"	24	Spiral	00000000	00000
6	5 7/8"	24	Spiral	00000000	00000
8	7 7/8"	24	Spiral	00000000	00000
10	9 7/8"	24	Spiral	00000000	00000
12	11 7/8"	24	Spiral	00000000	00000
14	13 7/8"	24	Spiral	00000000	00000
16	15 7/8"	24	Spiral	00000000	000000
PVC-Coated Steel
4	3 7/8"	24	Plain	00000000	00000
5	4 7/8"	24	Plain	00000000	00000
6	5 7/8"	24	Plain	00000000	00000
7	6 7/8"	24	Plain	00000000	00000
8	7 7/8"	24	Plain	00000000	00000
9	8 7/8"	24	Plain	00000000	000000
10	9 7/8"	24	Plain	00000000	000000
12	11 7/8"	24	Plain	00000000	000000
304 Stainless Steel
4	3 7/8"	20	Plain	0000000	00000
6	5 7/8"	20	Plain	0000000	00000
8	7 7/8"	20	Plain	0000000	000000
10	9 7/8"	20	Plain	0000000	000000

Tee Connectors

Tee connectors join or split runs of duct.

				Galvanized Steel		PVC-Coated Steel
Duct Size	Male OD	Gauge	End Construction		Each		Each
3	2 7/8"	24	Plain	00000000	000000	000000	00
4	3 7/8"	24	Plain	00000000	00000	00000000	000000
5	4 7/8"	24	Plain	00000000	00000	000000	00
6	5 7/8"	24	Plain	00000000	00000	00000000	00000
8	7 7/8"	24	Plain	00000000	00000	00000000	000000
10	9 7/8"	24	Plain	00000000	00000	00000000	000000
12	11 7/8"	24	Plain	00000000	000000	00000000	000000
14	13 7/8"	24	Plain	00000000	000000	000000	00
16	15 7/8"	24	Plain	00000000	000000	000000	00

45° Wye Connectors

Wye connectors join or split runs of duct.

				Galvanized Steel		PVC-Coated Steel
Duct Size	Male OD	Gauge	End Construction		Each		Each
3	2 7/8"	24	Plain	00000000	0000000	000000	00
4	3 7/8"	24	Plain	00000000	000000	000000	00
5	4 7/8"	24	Plain	00000000	000000	000000	00
6	5 7/8"	24	Plain	00000000	00000	00000000	0000000
8	7 7/8"	24	Plain	00000000	00000	00000000	000000
10	9 7/8"	24	Plain	00000000	000000	00000000	000000
12	11 7/8"	24	Plain	00000000	000000	000000	00
14	13 7/8"	24	Plain	00000000	000000	000000	00
16	15 7/8"	24	Plain	00000000	000000	000000	00

Straight Connectors

Male

Female

Male straight connectors are required to connect two pieces of duct.

Female straight connectors join two fittings.

Galvanized Steel
Duct Size	Female ID	Male OD	End Construction	Gauge		Each
Male
3	__	2 7/8"	Plain	24	0000000	000000
4	__	3 7/8"	Plain	24	0000000	00000
5	__	4 7/8"	Plain	24	0000000	00000
6	__	5 7/8"	Plain	24	0000000	00000
8	__	7 7/8"	Plain	24	0000000	00000
10	__	9 7/8"	Plain	24	0000000	00000
12	__	11 7/8"	Plain	24	0000000	00000
14	__	13 7/8"	Plain	22	0000000	00000
16	__	15 7/8"	Plain	22	0000000	00000
Female
3	3"	__	Plain	24	00000000	0000
4	4"	__	Plain	24	00000000	0000
5	5"	__	Plain	24	00000000	0000
6	6"	__	Plain	24	00000000	0000
8	8"	__	Plain	24	00000000	0000
10	10"	__	Plain	24	00000000	00000
12	12"	__	Plain	24	00000000	00000
14	14"	__	Plain	22	00000000	00000
16	16"	__	Plain	22	00000000	00000
PVC-Coated Steel
Male
4	__	3 7/8"	Plain	26	00000000	00000
5	__	4 7/8"	Plain	26	00000000	00000
6	__	5 7/8"	Plain	26	00000000	00000
7	__	6 7/8"	Plain	26	00000000	00000
8	__	7 7/8"	Plain	26	00000000	00000
9	__	8 7/8"	Plain	26	00000000	00000
10	__	9 7/8"	Plain	26	00000000	00000
12	__	11 7/8"	Plain	26	00000000	00000
304 Stainless Steel
Male
4	__	3 7/8"	Plain	24	0000000	00000
6	__	5 7/8"	Plain	24	0000000	00000
8	__	7 7/8"	Plain	24	0000000	00000
10	__	9 7/8"	Plain	24	0000000	00000

Tee Reducers

Reducers connect duct with different diameters.

Duct Size			Male OD					PVC-Coated Steel
(A)	(B)	(C)	(A)	(B)	(C)	Gauge	End Construction		Each
6	4	6	5 7/8"	3 7/8"	5 7/8"	24	Plain	00000000	000000
8	6	8	7 7/8"	5 7/8"	7 7/8"	24	Plain	00000000	000000
10	8	10	9 7/8"	7 7/8"	9 7/8"	24	Plain	00000000	000000
12	8	12	11 7/8"	7 7/8"	11 7/8"	24	Plain	00000000	000000

45° Wye Reducers

Reducers connect duct with different diameters.

Duct Size			Male OD					PVC-Coated Steel
(A)	(B)	(C)	(A)	(B)	(C)	Gauge	End Construction		Each
6	4	6	5 7/8"	3 7/8"	5 7/8"	24	Plain	00000000	000000
8	6	8	7 7/8"	5 7/8"	7 7/8"	24	Plain	00000000	000000
10	8	10	9 7/8"	7 7/8"	9 7/8"	24	Plain	00000000	000000
12	10	12	11 7/8"	9 7/8"	11 7/8"	24	Plain	00000000	000000

Straight Reducers

Reducers connect duct with different diameters.

Duct Size		Male OD
(A)	(B)	(A)	(B)	End Construction	Gauge		Each
Galvanized Steel
4	3	3 7/8"	2 7/8"	Plain	24	0000000	000000
5	4	4 7/8"	3 7/8"	Plain	24	0000000	00000
6	4	5 7/8"	3 7/8"	Plain	24	0000000	00000
6	5	5 7/8"	4 7/8"	Plain	24	0000000	00000
8	6	7 7/8"	5 7/8"	Plain	24	0000000	00000
10	6	9 7/8"	5 7/8"	Plain	24	0000000	00000
10	8	9 7/8"	7 7/8"	Plain	24	0000000	00000
12	10	11 7/8"	9 7/8"	Plain	24	0000000	00000
12	6	11 7/8"	5 7/8"	Plain	24	0000000	00000
12	8	11 7/8"	7 7/8"	Plain	24	0000000	00000
14	12	13 7/8"	11 7/8"	Plain	24	0000000	00000
16	14	15 7/8"	13 7/8"	Plain	24	0000000	00000
PVC-Coated Steel
5	4	4 7/8"	3 7/8"	Plain	20	00000000	00000
6	4	5 7/8"	3 7/8"	Plain	20	00000000	00000
6	5	5 7/8"	4 7/8"	Plain	20	00000000	00000
7	6	6 7/8"	5 7/8"	Plain	20	00000000	00000
8	6	7 7/8"	5 7/8"	Plain	20	00000000	00000
8	7	7 7/8"	6 7/8"	Plain	20	00000000	00000
9	8	8 7/8"	7 7/8"	Plain	20	00000000	00000
10	8	9 7/8"	7 7/8"	Plain	20	00000000	000000
10	9	9 7/8"	8 7/8"	Plain	20	00000000	000000
12	10	11 7/8"	9 7/8"	Plain	20	00000000	000000
304 Stainless Steel
6	4	5 7/8"	3 7/8"	Plain	20	0000000	00000
8	6	7 7/8"	5 7/8"	Plain	20	0000000	000000
10	6	9 7/8"	5 7/8"	Plain	20	0000000	000000
10	8	9 7/8"	7 7/8"	Plain	20	0000000	000000

Collars

Collar

Collar with Damper

Collars create branches from a rectangular duct. Cut a hole in the duct and use a collar to attach spiral duct.

					Galvanized Steel
Duct Size	Male OD	Gauge	Gasket Material	End Construction		Each
Collar
4	3 7/8"	24	Polyethylene Foam	Plain	0000000	000000
5	4 7/8"	24	Polyethylene Foam	Plain	0000000	00000
6	5 7/8"	24	Polyethylene Foam	Plain	00000000	00000
8	7 7/8"	24	Polyethylene Foam	Plain	00000000	00000
10	9 7/8"	24	Polyethylene Foam	Plain	00000000	00000
12	11 7/8"	24	Polyethylene Foam	Plain	00000000	00000
14	13 7/8"	24	Polyethylene Foam	Plain	00000000	00000
16	15 7/8"	24	Polyethylene Foam	Plain	00000000	00000
Collar with Damper
6	5 7/8"	24	Polyethylene Foam	Plain	00000000	00000
8	7 7/8"	24	Polyethylene Foam	Plain	00000000	00000
10	9 7/8"	24	Polyethylene Foam	Plain	00000000	00000
12	11 7/8"	24	Polyethylene Foam	Plain	00000000	00000
14	13 7/8"	24	Polyethylene Foam	Plain	00000000	00000
16	15 7/8"	24	Polyethylene Foam	Plain	00000000	00000

Floor Sweeps

Floor sweep connects to dust collection systems.

				Galvanized Steel
Duct Size	Gender	Gauge	End Construction		Each
6	Female	18	Plain	00000000	0000000

End Caps

Male

				Galvanized Steel		304 Stainless Steel
Duct Size	Male OD	Gauge	End Construction		Each		Each
Male
3	2 7/8"	24	Plain	0000000	000000	000000	00
4	3 7/8"	24	Plain	0000000	00000	0000000	000000
5	4 7/8"	24	Plain	0000000	00000	000000	00
6	5 7/8"	24	Plain	0000000	00000	0000000	00000
8	7 7/8"	24	Plain	0000000	00000	0000000	00000
10	9 7/8"	24	Plain	0000000	00000	0000000	00000
12	11 7/8"	24	Plain	0000000	00000	000000	00
14	13 7/8"	24	Plain	0000000	00000	000000	00
16	15 7/8"	24	Plain	0000000	00000	000000	00

Sure-Seal Spiral Duct and Fittings

Fittings have gaskets which create a tight seal—you don't need to seal joints with coating or tape. Fittings have male ends with a slightly smaller diameter to press-fit into duct. These duct and fittings are compatible with Crush-Resistant Spiral Duct and Fittings.

For technical drawings and 3-D models, click on a part number.

Duct

				Galvanized Steel
Duct Size	Female ID	Lg., ft.	Gauge		Each
4	4"	5	26	0000000	000000
6	6"	5	26	0000000	00000
8	8"	5	26	0000000	00000
10	10"	5	26	0000000	00000
12	12"	5	26	0000000	00000

90° Elbow Connectors

				Galvanized Steel
Duct Size	Male OD	Gauge	Gasket Material		Each
4	3 7/8"	24	EPDM Rubber	0000000	000000
6	5 7/8"	24	EPDM Rubber	0000000	00000
8	7 7/8"	24	EPDM Rubber	0000000	00000
10	9 7/8"	24	EPDM Rubber	0000000	00000
12	11 7/8"	24	EPDM Rubber	0000000	00000

45° Elbow Connectors

				Galvanized Steel
Duct Size	Male OD	Gauge	Gasket Material		Each
4	3 7/8"	24	EPDM Rubber	0000000	000000
6	5 7/8"	24	EPDM Rubber	0000000	00000
8	7 7/8"	24	EPDM Rubber	0000000	00000
10	9 7/8"	24	EPDM Rubber	0000000	00000
12	11 7/8"	24	EPDM Rubber	0000000	00000

Straight Connectors

Straight connectors are required to connect two pieces of duct.

				Galvanized Steel
Duct Size	Male OD	Gauge	Gasket Material		Each
4	3 7/8"	24	EPDM Rubber	0000000	000000
6	5 7/8"	24	EPDM Rubber	0000000	00000
8	7 7/8"	24	EPDM Rubber	0000000	00000
10	9 7/8"	24	EPDM Rubber	0000000	00000
12	11 7/8"	24	EPDM Rubber	0000000	00000

Tee Connectors

Tee connectors join or split runs of duct.

				Galvanized Steel
Duct Size	Male OD	Gauge	Gasket Material		Each
4	3 7/8"	24	EPDM Rubber	0000000	000000
6	5 7/8"	24	EPDM Rubber	0000000	00000
8	7 7/8"	24	EPDM Rubber	0000000	00000
10	9 7/8"	24	EPDM Rubber	0000000	00000
12	11 7/8"	24	EPDM Rubber	0000000	000000

Reducers

Reducers connect duct with different diameters.

Duct Size		Male OD				Galvanized Steel
(A)	(B)	(A)	(B)	Gauge	Gasket Material		Each
6	4	5 7/8"	3 7/8"	20	EPDM Rubber	0000000	000000
8	6	7 7/8"	5 7/8"	20	EPDM Rubber	0000000	00000
10	6	9 7/8"	5 7/8"	20	EPDM Rubber	0000000	00000
10	8	9 7/8"	7 7/8"	20	EPDM Rubber	0000000	00000
12	10	11 7/8"	9 7/8"	20	EPDM Rubber	0000000	00000
12	8	11 7/8"	7 7/8"	20	EPDM Rubber	0000000	00000

End Caps

				Galvanized Steel
Duct Size	Male OD	Gauge	Gasket Material		Each
4	3 7/8"	24	EPDM Rubber	0000000	000000
6	5 7/8"	24	EPDM Rubber	0000000	00000
8	7 7/8"	24	EPDM Rubber	0000000	00000
10	9 7/8"	24	EPDM Rubber	0000000	00000
12	11 7/8"	24	EPDM Rubber	0000000	00000

Standard Duct and Fittings

No need for clamps or connectors—duct and fittings press-fit together. Male ends are crimped or tapered, making them slightly smaller than a female end for simple assembly.

304 stainless steel is more corrosion resistant than steel and aluminum.

For technical drawings and 3-D models, click on a part number.

Duct

Closed Duct

Closed duct is stronger than open duct because it has a seam that is already locked in place.

					304 Stainless Steel
Duct Size	Female ID	Male OD	Gauge	End Construction		2 ft.	5 ft.
Closed Duct
4	4"	3 7/8"	24	Crimped	00000000	0000000	00
5	5"	4 7/8"	24	Crimped	0000000	000000	00
6	6"	5 7/8"	24	Crimped	0000000	00000	0000000
7	7"	6 7/8"	24	Crimped	0000000	000000	000000
8	8"	7 7/8"	24	Crimped	0000000	000000	000000
10	10"	9 7/8"	24	Crimped	0000000	000000	000000
12	12"	11 7/8"	24	Crimped	0000000	000000	000000

90° Elbow Connectors

Connectors with welded seams prevent leaks.

					304 Stainless Steel
Duct Size	Female ID	Male OD	Features	End Construction	Gauge		Each
3	3"	2 7/8"	Welded Seams	Tapered	20	00000000	0000000
4	4"	3 7/8"	Welded Seams	Tapered	20	00000000	000000
5	5"	4 7/8"	Welded Seams	Tapered	20	00000000	000000
6	6"	5 7/8"	Welded Seams	Tapered	20	00000000	000000
7	7"	6 7/8"	Welded Seams	Tapered	20	00000000	000000
8	8"	7 7/8"	Welded Seams	Tapered	20	00000000	000000
10	10"	9 7/8"	Welded Seams	Tapered	20	00000000	000000
12	12"	11 7/8"	Welded Seams	Tapered	20	00000000	000000

45° Elbow Connectors

45° Elbow Connector with Welded Seams

Connectors with welded seams prevent leaks.

					304 Stainless Steel
Duct Size	Female ID	Male OD	Features	End Construction	Gauge		Each
3	3"	2 7/8"	Welded Seams	Tapered	20	00000000	0000000
4	4"	3 7/8"	Welded Seams	Tapered	20	00000000	000000
5	5"	4 7/8"	Welded Seams	Tapered	20	00000000	000000
6	6"	5 7/8"	Welded Seams	Tapered	20	00000000	000000
7	7"	6 7/8"	Welded Seams	Tapered	20	00000000	000000
8	8"	7 7/8"	Welded Seams	Tapered	20	00000000	000000
10	10"	9 7/8"	Welded Seams	Tapered	20	00000000	000000
12	12"	11 7/8"	Welded Seams	Tapered	20	00000000	000000