Couplings for Glass | McMaster-Carr

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122 Products

How to Identify and Measure Fittings

Pipe size is an industry designation, not the actual size. View information about how to measure threaded and unthreaded pipe and pipe fittings.

Use these clamps to connect vacuum tube fittings. Insert two fittings into a clamp and tighten to form a secure seal.

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

Bolt Clamps

For Use With: Air, Glass, Plastic Pellets, Resins, Wood Chips
Temperature Range: Neoprene Rubber Gaskets: -20° to 190° F
Silicone Rubber Gaskets: -100° to 500° F
Tubing: Use with steel

Bolt clamps have a stainless steel strip that provides an escape route for electrostatic buildup when used in a fully-grounded system. They have fair corrosion resistance.

				Neoprene Rubber Gaskets		Silicone Rubber Gaskets
For Tube OD	Material	Max. Pressure	Max. Vacuum		Each		Each
1 1/2"	Galvanized Steel	15 psi @ 72° F	15 in. of Hg @ 72° F	0000000	000000	0000000	000000
1 3/4"	Galvanized Steel	15 psi @ 72° F	15 in. of Hg @ 72° F	0000000	00000	0000000	00000
2"	Galvanized Steel	15 psi @ 72° F	15 in. of Hg @ 72° F	0000000	00000	0000000	00000
2 1/8"	Galvanized Steel	15 psi @ 72° F	15 in. of Hg @ 72° F	0000000	00000	0000000	00000
2 1/4"	Galvanized Steel	15 psi @ 72° F	15 in. of Hg @ 72° F	0000000	00000	0000000	00000
2 1/2"	Galvanized Steel	15 psi @ 72° F	15 in. of Hg @ 72° F	0000000	00000	0000000	00000
3"	Galvanized Steel	15 psi @ 72° F	15 in. of Hg @ 72° F	0000000	00000	0000000	00000
5"	Galvanized Steel	15 psi @ 72° F	15 in. of Hg @ 72° F	0000000	00000	0000000	00000
6"	Galvanized Steel	15 psi @ 72° F	15 in. of Hg @ 72° F	0000000	00000	0000000	00000
8"	Galvanized Steel	15 psi @ 72° F	15 in. of Hg @ 72° F	0000000	00000	0000000	000000
10"	Galvanized Steel	15 psi @ 72° F	15 in. of Hg @ 72° F	0000000	00000	0000000	000000

Vacuum Fittings for Steel Tubing

For Use With: Air, Glass, Plastic Pellets, Resins, Wood Chips
Temperature Range: -10° to 180° F
Tubing: Galvanized Steel: Use with steel, galvanized steel
Steel: Use with steel

Use these fittings to create an air vacuum system without the hassle of brazing and welding. Insert two fittings into a clamp (sold separately) and tighten to form a secure seal.

Galvanized steel fittings have fair corrosion resistance. Fittings without a finish should only be used in noncorrosive environments.

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

Straight Adapters, Tube × Male Threaded Pipe

				Galvanized Steel		Steel
For Tube OD	Pipe Size	Max. Pressure	Max. Vacuum		Each		Each
NPT Threads
2 1/8"	2	15 psi @ 72° F	15 in. of Hg @ 72° F	00000000	000000	0000000	000000
2 1/2"	2 1/2	15 psi @ 72° F	15 in. of Hg @ 72° F	00000000	00000	0000000	00000
3"	3	15 psi @ 72° F	15 in. of Hg @ 72° F	00000000	00000	0000000	00000
3 1/2"	3 1/2	15 psi @ 72° F	15 in. of Hg @ 72° F	00000000	00000	0000000	00000
4"	4	15 psi @ 72° F	15 in. of Hg @ 72° F	00000000	00000	0000000	00000
5"	5	15 psi @ 72° F	15 in. of Hg @ 72° F	00000000	000000	0000000	00000
6"	6	15 psi @ 72° F	15 in. of Hg @ 72° F	00000000	000000	0000000	000000

Straight Adapters, Tube × Female Threaded Pipe

				Galvanized Steel		Steel
For Tube OD	Pipe Size	Max. Pressure	Max. Vacuum		Each		Each
NPT Threads
2 1/8"	2	15 psi @ 72° F	15 in. of Hg @ 72° F	00000000	000000	0000000	000000
2 1/2"	2 1/2	15 psi @ 72° F	15 in. of Hg @ 72° F	00000000	00000	0000000	00000
3"	3	15 psi @ 72° F	15 in. of Hg @ 72° F	00000000	00000	0000000	00000
3 1/2"	3 1/2	15 psi @ 72° F	15 in. of Hg @ 72° F	00000000	000000	0000000	000000
4"	4	15 psi @ 72° F	15 in. of Hg @ 72° F	00000000	000000	0000000	00000
5"	5	15 psi @ 72° F	15 in. of Hg @ 72° F	00000000	000000	0000000	000000
6"	6	15 psi @ 72° F	15 in. of Hg @ 72° F	00000000	000000	0000000	000000

Straight Adapters with Cap, Tube × Male Threaded Pipe

Adapters with cap allow you to insert tubing to create a temporary connection.

NPT Threads
For Tube OD	Pipe Size	Material	Max. Pressure	Max. Vacuum		Each
1 1/2"	2	Zinc	15 psi @ 72° F	15 in. of Hg @ 72° F	00000000	000000
2"	2	Zinc	15 psi @ 72° F	15 in. of Hg @ 72° F	00000000	00000

Straight Reducers, Tube

				Galvanized Steel		Steel
For Tube OD (A)	For Tube OD (B)	Max. Pressure	Max. Vacuum		Each		Each
2 1/2"	2 1/8"	15 psi @ 72° F	15 in. of Hg @ 72° F	0000000	000000	0000000	000000
3"	2 1/8"	15 psi @ 72° F	15 in. of Hg @ 72° F	0000000	00000	0000000	00000
3 1/2"	2 1/8"	15 psi @ 72° F	15 in. of Hg @ 72° F	0000000	00000	0000000	00000
3 1/2"	2 1/2"	15 psi @ 72° F	15 in. of Hg @ 72° F	00000000	00000	0000000	00000
4"	2 1/8"	15 psi @ 72° F	15 in. of Hg @ 72° F	00000000	00000	0000000	00000
5"	2 1/8"	15 psi @ 72° F	15 in. of Hg @ 72° F	00000000	000000	0000000	000000
6"	2 1/8"	15 psi @ 72° F	15 in. of Hg @ 72° F	00000000	000000	0000000	000000

90° Elbow Connectors, Tube

			Galvanized Steel		Steel
For Tube OD	Max. Pressure	Max. Vacuum		Each		Each
2 1/8"	15 psi @ 72° F	15 in. of Hg @ 72° F	0000000	000000	0000000	000000
2 1/2"	15 psi @ 72° F	15 in. of Hg @ 72° F	0000000	00000	0000000	00000
3"	15 psi @ 72° F	15 in. of Hg @ 72° F	0000000	00000	0000000	00000
3 1/2"	15 psi @ 72° F	15 in. of Hg @ 72° F	0000000	00000	0000000	00000
4"	15 psi @ 72° F	15 in. of Hg @ 72° F	0000000	00000	0000000	00000
5"	15 psi @ 72° F	15 in. of Hg @ 72° F	0000000	000000	0000000	00000
6"	15 psi @ 72° F	15 in. of Hg @ 72° F	0000000	000000	0000000	000000

45° Elbow Connectors, Tube

			Galvanized Steel		Steel
For Tube OD	Max. Pressure	Max. Vacuum		Each		Each
2 1/8"	15 psi @ 72° F	15 in. of Hg @ 72° F	0000000	000000	0000000	000000
2 1/2"	15 psi @ 72° F	15 in. of Hg @ 72° F	0000000	00000	0000000	00000
3"	15 psi @ 72° F	15 in. of Hg @ 72° F	0000000	00000	0000000	00000
3 1/2"	15 psi @ 72° F	15 in. of Hg @ 72° F	0000000	00000	0000000	00000
4"	15 psi @ 72° F	15 in. of Hg @ 72° F	0000000	00000	0000000	00000
5"	15 psi @ 72° F	15 in. of Hg @ 72° F	0000000	00000	0000000	00000
6"	15 psi @ 72° F	15 in. of Hg @ 72° F	0000000	000000	0000000	00000

Tee Connectors, Tube

			Galvanized Steel		Steel
For Tube OD	Max. Pressure	Max. Vacuum		Each		Each
2 1/8"	15 psi @ 72° F	15 in. of Hg @ 72° F	0000000	000000	0000000	000000
2 1/2"	15 psi @ 72° F	15 in. of Hg @ 72° F	0000000	00000	0000000	00000
3"	15 psi @ 72° F	15 in. of Hg @ 72° F	0000000	00000	0000000	00000
3 1/2"	15 psi @ 72° F	15 in. of Hg @ 72° F	0000000	000000	0000000	00000
4"	15 psi @ 72° F	15 in. of Hg @ 72° F	0000000	000000	0000000	000000
5"	15 psi @ 72° F	15 in. of Hg @ 72° F	0000000	000000	0000000	000000
6"	15 psi @ 72° F	15 in. of Hg @ 72° F	0000000	000000	0000000	000000

45° Tee Connectors, Tube

			Galvanized Steel		Steel
For Tube OD	Max. Pressure	Max. Vacuum		Each		Each
2 1/8"	15 psi @ 72° F	15 in. of Hg @ 72° F	0000000	000000	0000000	000000
2 1/2"	15 psi @ 72° F	15 in. of Hg @ 72° F	0000000	00000	0000000	00000
3"	15 psi @ 72° F	15 in. of Hg @ 72° F	0000000	00000	0000000	00000
3 1/2"	15 psi @ 72° F	15 in. of Hg @ 72° F	0000000	00000	0000000	000000
4"	15 psi @ 72° F	15 in. of Hg @ 72° F	0000000	000000	0000000	00000
5"	15 psi @ 72° F	15 in. of Hg @ 72° F	0000000	000000	0000000	000000
6"	15 psi @ 72° F	15 in. of Hg @ 72° F	0000000	000000	0000000	000000

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How to Identify and Measure Fittings

Clamps for Vacuum Fittings for Steel Tubing

Vacuum Fittings for Steel Tubing