18mm Tubing | McMaster-Carr

This general purpose PVC tubing is the industry standard for air and water applications. Tubing is clear, so you can easily monitor flow. It is flexible to easily bend around objects.

Masterkleer tubing is more economical than Tygon tubing.

Clear Masterkleer PVC Plastic

Flexible
Compatible with Barbed Tube Fittings
Hardness: Soft (Durometer 70A)
Temperature Range: -40° to 140° F

Metric
ID	OD	Wall Thick.	Bend Radius	Max. Pressure	Color	Lengths, ft.		Per Ft.
18mm	23mm	2.5mm	70mm	15 psi @ 72° F	Clear	5, 10, 25	00000000	00000

Soft Plastic Tubing for Chemicals

Use this general purpose PVC tubing with a variety of chemicals. Tubing is clear, so you can easily monitor flow. It is flexible, so it bends easily around objects.

PVC tubing is the most economical option.

Clear PVC Plastic

Flexible
Compatible with Barbed Tube Fittings
Soft (Durometer 60A)
Temperature Range: -20° to 160° F

Metric
ID	OD	Wall Thick.	Bend Radius	Max. Pressure	Max. Vacuum	Color	Lengths, ft.		Per Ft.
18mm	23mm	2.5mm	92mm	20 psi @ 72° F	Not Rated	Clear	5, 10, 25, 50	00000000	00000

High-Temperature Abrasion-Resistant Soft
Rubber Tubing for Food, Beverage, and Dairy

Flexible
Compatible with Barbed Tube Fittings
Soft (Durometer 65A)
Temperature Range: -60° to 450° F

Not only can this tubing handle the highest temperatures of all our soft tubing for food, beverage, and dairy, it also has thick, silicone rubber walls for superior abrasion and crush resistance. Tubing is made of FDA listed materials. Free of plasticizers like DEHP, it won’t impart tastes or odors to the fluid passing through it. Tubing is semi-clear, so you get a limited view inside the line. It is flexible, so it bends easily around objects.

Semi-Clear Silicone Rubber
ID	OD	Wall Thick.	Bend Radius	Max. Pressure	Color	Specifications Met	Lengths, ft.		Per Ft.
Metric
18mm	23mm	2.5mm	57mm	30 psi @ 72° F	White	FDA Compliant 21 CFR 177.2600	2, 5, 10, 25, 50, 100	0000000	00000

Abrasion-Resistant Soft Rubber Tubing for Fuel

Semi-Clear Blue

Flexible
Compatible with Barbed Tube Fittings
Soft (Durometer 70A)
Temperature Range: -40° to 180° F

This polyurethane tubing is soft enough to handle continuous bending and flexing, yet tough enough to resist tearing and abrasion. Use it in applications requiring movement, such as metering (peristaltic) pumps and robotics. Tubing is semi-clear, so you get a limited view inside the line.

Semi-Clear Polyurethane Rubber
ID	OD	Wall Thick.	Bend Radius	Max. Pressure	Color	Lengths, ft.		Per Ft.
Metric
18mm	23mm	2.5mm	152mm	20 psi @ 72° F	Blue	10, 25, 50, 100	0000000	000000

General Purpose Copper Tubing

Straight

This tubing has good corrosion resistance and excellent heat transfer qualities. It is seamless, which provides a smooth interior for unrestricted flow. It can be flared without splitting. All tubing meets international standards for copper tubing.

Metric Straights

Temperature Range: -20° to 400° F
Bendable: No
Specifications Met: ASTM B68, ASTM B75
Compatible Tube Fittings: Solder Connect

For Use With Air, Hydraulic Fluid, Oil, Water
OD, mm	Wall Thick., mm	ID, mm	Max. Pressure	Temper Rating		0.5 m	1 m
20	1	18	1,200 psi @ 72° F	Hard	00000000	000000	0000000

Plastic Barbed Tube Fittings for Air and Water

Fittings have barbs that grip onto tubing.

Acetal fittings won’t absorb water and lose strength, even in high-humidity environments.

Inline Tee Reducers, Tube

Temperature Range: -40° to 175° F
Tubing: Use with firm or soft (Durometer 40A-80A) polyurethane rubber or PVC plastic

Inline tees are also known as branch tees.

For Tube ID (A)	For Tube ID (B)	Material	Color	Clarity	Maximum Pressure	Pkg. Qty.		Pkg.
18mm	10mm	Acetal Plastic	White	Semi-Clear	145 psi @ 72° F	10	00000000	000000
18mm	15mm	Acetal Plastic	White	Semi-Clear	145 psi @ 72° F	10	00000000	00000

Tube Supports for Brass Compression Tube Fittings for Air and Water

Use these sleeves with brass compression nuts and fittings to create a seal on plastic and rubber tubing. They are brass, so they won’t damage tubing.

For Use With Air, Lubricated Air, and Water

Temperature Range: -75° to 550° F
Tubing: Use with hard or firm (Rockwell 15T 1-15T 60) nylon plastic, polyethylene plastic, polypropylene plastic, or polyurethane rubber

For Tube, mm
OD	ID	Tube Support Material	Max. Pressure		Each
22	18	Brass	1000 psi @ 72° F	000000	00000

Metal Barbed Hose Fittings for Air and Water

Slide the barbed end into rubber hose and secure with the appropriate clamp or crimp-on hose ferrule.

Brass fittings are softer than other metal fittings, so they’re easier to thread together. Plain brass fittings have good corrosion resistance. Nickel-plated brass fittings resist corrosion better than plain brass fittings.

Aluminum fittings are lighter in weight than other metal fittings. They have good corrosion resistance.

Stainless steel fittings have very good corrosion resistance. 303 stainless steel fittings won’t rust when exposed to water, making them good for areas that require frequent cleanings. Fittings with a threaded end are also known as hose nipples.

Hose connectors are also known as hose menders and splicers. Use them to connect lengths of hose or to repair damaged hose.

Metric, UN/UNF (SAE Straight), and BSPP male threads with gasket protect against leaks.

Straight Adapters, Hose × NPT/NPTF Male Threaded Pipe

Maximum Pressure: See table
Maximum Vacuum: See table
Temperature Range: See table
Attachment Type: See table
Specifications Met: See table

Brass
For Hose ID	Pipe Size	Max. Pressure	Max. Vacuum	Temperature Range, °F	Attachment Type	Pkg. Qty.		Pkg.
18mm	3/4	125 psi @ 72° F	27 in. of Hg @ 72° F	-30° to 200°	Worm-Drive Clamp, Band-and-Buckle Clamp, Crimp-On Hose Ferrule	1	00000000	000000
Nickel-Plated Brass
18mm	3/4	125 psi @ 72° F	27 in. of Hg @ 72° F	-30° to 200°	Worm-Drive Clamp, Band-and-Buckle Clamp, Crimp-On Hose Ferrule	1	00000000	00000
303 Stainless Steel
18mm	3/4	250 psi @ 72° F	27 in. of Hg @ 72° F	-30° to 200°	Worm-Drive Clamp, Crimp-On Hose Ferrule	1	00000000	00000
18mm	1	250 psi @ 72° F	27 in. of Hg @ 72° F	-30° to 200°	Worm-Drive Clamp, Crimp-On Hose Ferrule	1	00000000	00000

Straight Adapters, Hose × BSPP Male Threaded Pipe

NPT/NPTF, Metric, BSPP, and
UN/UNF (SAE Straight)
Male Threads with Gasket

Maximum Pressure: See table
Maximum Vacuum: See table
Temperature Range: See table
Attachment Type: See table
Specifications Met: Bronze Fittings: ASTM B584

Brass
For Hose ID	Pipe Size	Gasket Material	Max. Pressure	Max. Vacuum	Temperature Range, °F	Attachment Type	Pkg. Qty.		Pkg.
18mm	3/4	Buna-N Rubber	300 psi @ 72° F	27 in. of Hg @ 72° F	-30° to 200°	Worm-Drive Clamp, Band-and-Buckle Clamp, Crimp-On Hose Ferrule	1	00000000	000000
Aluminum
18mm	1	Buna-N Rubber	125 psi @ 72° F	27 in. of Hg @ 72° F	-30° to 200°	Worm-Drive Clamp, Band-and-Buckle Clamp, Crimp-On Hose Ferrule	1	00000000	00000

Straight Adapters, Hose × NPT/NPTF Female Threaded Pipe

Maximum Pressure: See table
Maximum Vacuum: See table
Temperature Range: See table
Attachment Type: See table
Specifications Met: See table

Brass
For Hose ID	Pipe Size	Max. Pressure	Max. Vacuum	Temperature Range, °F	Attachment Type	Pkg. Qty.		Pkg.
18mm	3/4	300 psi @ 72° F	27 in. of Hg @ 72° F	-30° to 200°	Worm-Drive Clamp, Band-and-Buckle Clamp, Crimp-On Hose Ferrule	1	00000000	000000
303 Stainless Steel
18mm	1	125 psi @ 72° F	27 in. of Hg @ 72° F	-30° to 200°	Worm-Drive Clamp, Crimp-On Hose Ferrule	1	00000000	00000

Straight Connectors, Hose

Maximum Pressure: See table
Maximum Vacuum: See table
Temperature Range: See table
Attachment Type: See table
Specifications Met: See table

Brass
For Hose ID	Max. Pressure	Max. Vacuum	Temperature Range, °F	Attachment Type	Pkg. Qty.		Pkg.
18mm	125 psi @ 72° F	27 in. of Hg @ 72° F	-30° to 200°	Worm-Drive Clamp, Band-and-Buckle Clamp, Crimp-On Hose Ferrule	1	00000000	000000

Straight Reducers, Hose

Maximum Pressure: See table
Maximum Vacuum: See table
Temperature Range: See table
Attachment Type: See table
Specifications Met: See table

For Hose ID
(A)	(B)	Max. Pressure	Max. Vacuum	Temperature Range, °F	Attachment Type	Pkg. Qty.		Pkg.
Brass
19mm	18mm	300 psi @ 72° F	27 in. of Hg @ 72° F	-30° to 200°	Worm-Drive Clamp, Band-and-Buckle Clamp, Crimp-On Hose Ferrule	1	00000000	000000

Plastic Barbed Hose Fittings for Water

Made of polypropylene, these fittings have good corrosion and abrasion resistance, and are lighter in weight than metal barbed hose fittings. Slide the barbed end into plastic or rubber hose and secure with a clamp.

Fittings with a threaded end are also known as hose nipples.

Straight Adapter, Hose × BSPT Male Threaded Pipe

Straight Adapter, Hose × Male Threaded Pipe

Maximum Pressure: 200 psi @ 72° F
Temperature Range: 35° to 190° F
Attachment Type: Use Worm-Drive Clamps or Bolt Clamps

Polypropylene Plastic
For Hose ID	Pipe Size	Color		Each
18mm	3/4	Black	00000000	00000
18mm	1	Black	00000000	0000

Metal Barbed Hose Fittings for Chemicals and Petroleum

Made of stainless steel, these fittings stand up to a wide variety of chemicals, as well as fuels, gasoline, and oils. To connect, slide the barbed end into plastic or rubber hose and secure with a clamp.

Adapters are also known as hose nipples; they adapt a barbed end to a threaded end.

Straight Adapters, Hose × NPT Male Threaded Pipe

For Use With: See table
Maximum Pressure: See table
Temperature Range: See table
Attachment Type: Use Band-and-Buckle Clamps

316 Stainless Steel
For Hose ID	Pipe Size	Max. Pressure	Temperature Range, °F	For Use With		Each
18mm	3/4	300 psi @ 72° F	-40° to 300°	Acetone, Diesel Fuel, Ethanol, Fuel Oil, Gasoline, Mineral Oil, Mineral Spirits, Vegetable Oil	000000000	000000

Aluminum Quick-Connect Pipe for Compressed Air

For Use With: Air, Coolant, Nitrogen, Oil
Maximum Pressure: 230 psi @ 72° F
Specifications Met: ASTM B241
Fittings: Use Quick-Disconnect Aluminum

Build a compressed air system in half the time it would take to build a copper or steel system. Also known as Unipipe, this pipe is part of a quick-connect system. The compatible fittings connect to this pipe when you finger tighten their collar and then use a wrench for the final quarter turn. A compression ring and O-ring inside the fitting seal it onto this pipe.

Choose blue or gray pipe for easy identification. Blue pipe is often used for compressed air systems. Gray pipe is often used for vacuum systems.

Use a deburring scraper (sold separately) to smooth rough edges left behind after trimming the pipe to size.

Blue Unthreaded

OD	ID	Wall Thick.	Construction	Material		3 ft. Lg.	8 ft. Lg.
3/4" (20 mm)	0.709" (18 mm)	0.039" (1 mm)	Seamless	Powder-Coated 6060 Aluminum	0000000	000000	000000

Gray Unthreaded

OD	ID	Wall Thick.	Construction	Material		3 ft. Lg.	8 ft. Lg.
3/4" (20 mm)	0.709" (18 mm)	0.039" (1 mm)	Seamless	Powder-Coated 6060 Aluminum	0000000	000000	000000

Deburring Scrapers

Place the tool over the end of your tube and twist to deburr.

For Deburring Outer Tube Edges and Inner Tube Edges
For Tube OD	Blade Material	Overall Lg.	Body Material	For Use On		Each
3/16"-1 1/2"	Steel	2 1/4"	Zinc	Aluminum, Copper, Brass, Plastic	0000000	000000

Polished Multipurpose 304 Stainless Steel

Polished to either a brushed or mirror-like finish, this material is widely used to fabricate decorative enclosures and industrial workstations. The sheets, strips, bars, and adhesive-back foil are covered with a protective peel-off film. 304 stainless steel is a good all-around choice for a wide range of applications. It maintains its corrosion resistance in temperatures up to 1500° F.

Brushed #4 is often called a satin finish; it’s similar to a #3 finish, except the grain lines are finer. Rectangular and round tubes are polished on the outside.

Certificates with a traceable lot number are available for these products. Download certificates from ORDER HISTORY after your order ships.

Round Tubes

Brushed #4

Yield Strength:
Inch Sizes: Not Rated
Metric Sizes: 24,000 psi
Hardness:
Inch Sizes: Rockwell B80 (Medium)
Metric Sizes: Rockwell B70 (Medium)
Heat Treatment: See table
Heat Treatable: No
Specifications Met:
Inch Sizes: ASTM A554
Metric Sizes: ASTM A269

Brushed #4
OD	OD Tolerance	ID	Fabrication	Heat Treatment	Straightness Tolerance		1 ft. Lg.	3 ft. Lg.	6 ft. Lg.
1mm Wall Thick. (-0.015mm to 0.015mm Tolerance)
20mm	-0.130mm to 0.130mm	18mm	Seamless	Annealed (Softened)	Not Rated	0000000	000000	0000000	0000000

Ultra-High-Temperature Quartz Glass Tubes

Color: Clear
Max. Temperature: 2000° F
Fabrication: Annealed

Blistering temperatures won’t melt these quartz tubes, and rapid temperature shifts won’t cause them to crack. Even tougher than borosilicate, they can be used in furnaces and ovens heated up to 2000° F. These highly pure tubes are often used in laboratories because they won’t leach impurities into samples or contaminate chemical reactions. Quartz tubes are optically clear and have excellent UV transmission, making them ideal for UV purification systems.

				12" Lg.
OD	ID	Wall Thick.	Edge Fabrication		Each
Metric
21.6mm	18.000mm	1.8mm	Ground	0000000	000000