5 Pipe Size Reducers | McMaster-Carr

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300 Series Stainless Steel

Pipe Material

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Fitting Connection

For Use With

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Connects To

Pressure Class

For Flange Pipe Size

For Pipe OD

5 5/8"

Fitting Material

Iron

Steel

Flanged Connection Surface

Raised

Maximum Pressure @ Temperature

Bolt Circle Diameter

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

Yes

Export Control Classification Number (ECCN)

REACH

RoHS

DFARS Specialty Metals

Exempt

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9 Products

About Pipe and Fittings

Measure your pipe and fittings to identify their pipe size, thread size, schedule, and thread type. Then, find compatible components.

Low-Pressure Iron and Steel Threaded Pipe Fittings

Use these fittings for low-pressure applications in noncorrosive environments.

Bushing Straight Reducing Adapters with Hex Body

For Use With: Air, Steam, Oil, Water, Natural Gas
Pressure Class: See table
Pipe Nipples and Pipe: Use Schedule 40 steel
Specifications Met: See table

Pipe Size
(A)	(B)	Pressure Class	Max. Pressure	Max. Steam Pressure	Material	Specifications Met		Each
NPT Male × NPT Female
6	5	125	175 psi @ 72° F	125 psi @ 350° F	Iron	ASME B16.14	44605K749	0000000

Low-Pressure Steel Threaded Pipe Flanges

Use these flanges for low-pressure applications in noncorrosive environments. Bolt two flanges of the same size together with a gasket (sold separately) to create an access point within a line.

Reducing flanges allow you to transition your system to a smaller pipe size; attach to a flange with a larger pipe size but with the same flange dimensions.

Reducing Flanges

Front

Raised Surface on Back

For Use With:
1/4 Pipe Size: Air, Natural Gas, Oil, Water
All other sizes: Air, Natural Gas, Oil, Steam, Water
Specifications Met:
1/4 Pipe Size: ASTM A105, MSS SP-6
All other sizes: ASME B16.5, ASTM A105, MSS SP-25, MSS SP-6
Fittings: Use Class 125 or 150 iron and steel
Pipe Nipples and Pipe: Use Schedule 40 Steel

				Bolt Hole
Pipe Size	For Flange Pipe Size	Flange OD	For Bolt Dia.	Dia.	No. of	Bolt Circle Dia.	Max. Pressure	Max. Steam Pressure	Material		Each
NPT
5	6	11"	3/4"	7/8"	8	9 1/2"	285 psi @ 72° F	230 psi @ 300° F	Steel	1802N48	0000000

Low-Pressure Clamp-On Connectors for Drain, Waste, and Vent

To make installing and maintaining systems easy, these connectors come with clamps that form a strong seal on pipe and fittings once tightened.

Straight offset reducers connect one pipe to a smaller-diameter pipe, keeping your pipes aligned for obstruction-free flow in either direction. They are also known as eccentric reducers.

Connectors with a stainless steel sleeve reinforce the connection to increase shear strength.

Straight Connectors

Pipe End × Pipe End—300 Series Stainless Steel Sleeve

For Use With: Air, Water
Temperature Range: -40° to 120° F
Specifications Met: See table
For Pipe Material:
Pipe: Cast Iron, Steel, Copper, Lead, PVC Plastic, CPVC Plastic, Polyethylene
Socket-Connect Pipe: PVC Plastic, CPVC Plastic, Polyethylene Plastic

Pipe End × Pipe End—300 Series Stainless Steel Sleeve
For Pipe OD	For Pipe Size	Lg.	Max. Pressure	Max. Vacuum	Material	Clamp Material	Flexibility	Specifications Met		Each
5 5/8"	5	4"	4 psi @ 72° F	Not Rated	PVC Plastic	300 Series Stainless Steel	Flexible	ASTM C1173, ASTM D5926	4511K311	000000

Straight Reducers

Pipe End × Pipe End

Pipe End × Pipe End—300 Series Stainless Steel Sleeve

For Use With: Air, Water
Temperature Range: -40° to 120° F
Specification Met: See table
For Pipe Material: Cast Iron, Steel, PVC Plastic, Copper, Lead, CPVC Plastic, Polyethylene Plastic

For Pipe Size
(A)	(B)	Lg.	Max. Pressure	Max. Vacuum	Material	Clamp Material	Flexibility	Specifications Met		Each
Pipe End × Pipe End
5	3	3 7/8"	4 psi @ 72° F	Not Rated	PVC Plastic	300 Series Stainless Steel	Flexible	ASTM C1173, ASTM D5926, CSA Certified	4511K56	000000
5	4	4"	4 psi @ 72° F	Not Rated	PVC Plastic	300 Series Stainless Steel	Flexible	ASTM C1173, ASTM D5926, CSA Certified	4511K57	00000
6	5	5 3/4"	4 psi @ 72° F	Not Rated	PVC Plastic	300 Series Stainless Steel	Flexible	ASTM C1173, ASTM D5926, CSA Certified	4511K63	00000
Pipe End × Pipe End—300 Series Stainless Steel Sleeve
5	4	4"	4 psi @ 72° F	Not Rated	PVC Plastic	300 Series Stainless Steel	Flexible	ASTM C1173, ASTM D5926	4511K391	00000

Straight Offset Reducers

Obstruction-Free Flow

For Use With: Air, Water
Temperature Range: -30° to 120° F
Specification Met: See table
For Pipe Material: Cast Iron, Steel, Copper, Lead, PVC Plastic, CPVC Plastic, Polyethylene Plastic

For Pipe Size
(A)	(B)	Lg.	Max. Pressure	Max. Vacuum	Material	Clamp Material	Flexibility	Specifications Met		Each
Pipe End × Pipe End
5	4	4 1/4"	4 psi @ 72° F	Not Rated	PVC Plastic	300 Series Stainless Steel	Flexible	ASTM C1173, ASTM D5926	4511K221	0000000
6	5	6"	4 psi @ 72° F	Not Rated	PVC Plastic	300 Series Stainless Steel	Flexible	ASTM C1173, ASTM D5926	4511K241	000000