2 1/8" Tubing | McMaster-Carr

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DFARS Specialty Metals
COTS-Exempt

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Low Thermal Expansion

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61 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.

About Hose

About Durometer Hardness Scales

About Duct Hose

About Plastic

About Sleeving

About Selecting Thermal Insulation

About Stainless Steel

About Carbon Steel, Alloy Steel, Spring Steel, and Cast Iron

Extra-Thick-Wall Steel Threaded Pipe Nipples and Pipe

Extra-thick walls give this pipe excellent strength to handle high-pressure applications. It is also known as Schedule 160. Pipe is seamless, so it has a smooth interior for unrestricted flow. It is for use in noncorrosive environments.

Fully threaded pipe is also known as a close nipple; it is threaded on each end to the center.

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

Fully Threaded

For Use With: Air, Water, Oil, Natural Gas, Steam, Hydraulic Fluid
Specifications Met: ASME B1.20.1, ASTM A106, ASTM A53, ASTM A733
Fittings: Use Class 3000 steel
Flanges: Use Class 1500 steel

Pipe Size	Dash Size	Lg.	Thread Type	Construction	Material		Each
2 1/2	40	2 1/2"	NPT	Seamless	Black-Coated Steel	00000000	0000000

Threaded on Both Ends

For Use With: Air, Water, Oil, Natural Gas, Steam, Hydraulic Fluid
Specifications Met: ASME B1.20.1, ASTM A106, ASTM A53, ASTM A733
Fittings: Use Class 3000 steel
Flanges: Use Class 1500 steel

2 1/2 Pipe Size—40 Dash Size
Lg.	Thread Type	Construction	Material		Each
3"	NPT	Seamless	Black-Coated Steel	00000000	0000000
4"	NPT	Seamless	Black-Coated Steel	00000000	000000
5"	NPT	Seamless	Black-Coated Steel	00000000	000000
6"	NPT	Seamless	Black-Coated Steel	00000000	000000
8"	NPT	Seamless	Black-Coated Steel	00000000	000000
10"	NPT	Seamless	Black-Coated Steel	00000000	000000
12"	NPT	Seamless	Black-Coated Steel	00000000	000000
18"	NPT	Seamless	Black-Coated Steel	0000000	000000
24"	NPT	Seamless	Black-Coated Steel	0000000	000000

High-Temperature Rigid Metal Duct Hose for Fumes

Rigid
Compatible Clamps: U-Bolt Clamps
Max. Temperature: Galvanized Steel: 750° F; Aluminum: 450° F; 304 Stainless Steel: 1500° F; 316 Stainless Steel: 1200° F

Metal interlocked strips create a rigid, durable hose that stays strong under high temperatures. Hose is for use with smoke, welding fumes, and oil fumes.

Galvanized steel offers fair corrosion resistance.

Galvanized Steel
ID	OD	Bend Radius	Interior Surface Texture	Other Lengths, ft.		5 ft.	6 ft.	7 ft.	8 ft.	9 ft.	10 ft.	15 ft.	20 ft.	25 ft.
0.012" Material Thick.
2 1/8"	2 5/16"	7"	Ribbed	1 to 50	0000000	000000	000000	000000	000000	000000	000000	000000	000000	000000

High-Temperature Coolant Hose

Temperature Range: -65° to 350° F
Material: Silicone Rubber
Color: Blue
For Clamp Type: Worm Drive

Silicone rubber gives this hose, often called radiator hose, the ability to handle high-heat conditions.

						Per Ft.
ID	OD	Max. Pressure	Internal Reinforcement	Max. Continuous Lg., ft.		1-11	12-Up
2 1/8"	2 1/2"	50 psi @ 72° F	Yarn	12	00000000	000000	000000

Coolant Hose

Temperature Range: 0° to 210° F
Material: Buna-N Rubber
Color: Black with Green Stripe
For Clamp Type: Worm Drive

Commonly known as radiator hose, this hose is for low-pressure coolant applications.

					Per Ft.
ID	OD	Max. Pressure	Max. Continuous Lg., ft.		1-24	25-Up
2 1/8"	2 1/2"	40 psi @ 72° F	25	00000000	000000	000000

Flexible Coolant Hose

Temperature Range: -20° to 210° F
Maximum Vacuum: 28" of Hg @ 72° F
Material: Buna-N Rubber with Neoprene Rubber Cover
Color: Black with Yellow Stripe
For Clamp Type: Worm Drive

With a tighter bend radius than other coolant hose, this hose can easily twist and turn around equipment.

						Per Ft.
ID	OD	Bend Radius	Max. Pressure	Max. Continuous Lg., ft.		1-24	25-Up
2 1/8"	2 5/8"	6 3/8"	30 psi @ 72° F	25	0000000	000000	000000

Low-Carbon Steel Round Tubes

Also known as mild steel, low-carbon steel is easy to machine, form, and weld. It's widely fabricated into parts that don’t require high strength, such as fixture clamps, mounting plates, and spacers.

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

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

Tubes

Yield Strength: See table
Hardness: See table
Heat Treatable: See table
Specifcations Met: See table

0.188" Wall Thick. (Oversized Tolerance)
OD	OD Tolerance	ID	Yield Strength, psi	Heat Treatable	Heat Treatment	Hardness	Specifications Met		1 ft. Lg.	3 ft. Lg.	6 ft. Lg.
2 1/2"	0" to 0.008"	2 1/8"	45,000	No	Stress Relieved	Rockwell B60 (Medium)	ASTM A513 Type 5	0000000	000000	0000000	0000000

Corrosion-Resistant 316 Stainless Steel

The addition of molybdenum gives 316 stainless steel excellent corrosion resistance. Use it in a variety of marine and chemical-processing applications. It maintains its corrosion resistance up to the maximum temperature.

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

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

Round Tubes

Yield Strength:
316 Stainless Steel: 30,000 psi
316/316L Stainless Steel: 25,000 psi
Hardness: Rockwell B80 (Medium)
Heat Treatment: Annealed (Softened)
Heat Treatable: No
Specifications Met: See Table

316 Stainless Steel
OD	OD Tolerance	ID	Fabrication	Max. Temp., °F	Straightness Tolerance	Specifications Met		1/2 ft. Lg.	1 ft. Lg.	2 ft. Lg.	4 ft. Lg.
0.188" Wall Thick. (-0.026" to 0.026" Tolerance)
2 1/2"	-0.023" to 0.023"	2 1/8"	Seamless	1500°	0.045" per 3 ft.	ASTM A511	00000000	0000000	0000000	0000000	0000000

Clear Scratch- and UV-Resistant Cast Acrylic Tubes

Color: Clear
Temperature Range: 0° to 150° F
Tensile Strength: 10,000-11,250 psi (Good)
Impact Strength: 0.3-0.4 ft.-lbs./in. (Poor)
Hardness: Rockwell M94-M100 (Hard)
For Use Outdoors: Yes
Specifications Met: See table

Fabricate containers, tanks, and lenses for light fixtures with these scratch- and UV-resistant cast acrylic tubes. Cast acrylic, which is comparable to Lucite and Plexiglas® Acrylic, is easier to machine than extruded acrylic. This material stands up to outdoor use better than polycarbonate and maintains clarity over time.

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

3/16" Wall Thick.
OD	OD Tolerance	ID	Lengths, ft.	Specifications Met		Per Ft.
2 1/2"	-0.020" to 0.020"	2 1/8"	1, 3, 5	ASTM D5436, FDA Compliant 21 CFR 177.1010, UL 94 HB	00000000	000000

Clear Impact-Resistant Polycarbonate Tubes

Color: Clear
Temperature Range: -40° to 200° F
Tensile Strength: 8,900-9,500 psi (Good)
Impact Strength: 12-18 ft.-lbs./in. (Excellent)
Hardness: Rockwell R118 (Hard)
For Use Outdoors: No

Comparable to Lexan, Hyzod, Tuffak, and Makrolon, these polycarbonate tubes are half the weight of glass and maintain excellent impact resistance across a wide temperature range. Use them to make instrument gauge covers and display racks.

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

Round Tubes

1/16" Wall Thick. (-0.0045" to 0.0055")
OD	OD Tolerance	ID	ID Tolerance	Specifications Met		1 ft. Lg.	2 ft. Lg.	3 ft. Lg.	4 ft. Lg.	8 ft. Lg.
2 1/4"	-0.020" to 0.020"	2 1/8"	-0.020" to 0.020"	FDA Compliant 21 CFR 177.1580, UL 94 HB	0000000	000000	000000	000000	000000	000000

Hook-and-Loop Wrap-Around Sleeving for Universal Robots

Organize and protect the cables and tubing on your Universal Robots arm without hindering its movement. This sleeving is made for Universal Robots arms, so you don’t need to measure, cut, or customize for a good fit. The hook-and-loop closure makes installation quick, and unlike cable ties, it’s easy to detach and adjust. Cables run through a separate channel, so you can access them without removing the sleeving from your arm. Made from polyurethane, this sleeving is flexible enough for cables and tubing to move easily, and durable enough to withstand continuous movement. It’s also lighter than hose carriers and conduit, so it won’t weigh down your robot arm. Each includes two pieces of sleeving.

Polyurethane Rubber
ID	Wd.	Lg.	Wall Thick.	Temperature Range, °F	Features	Cable Opening Wd.	Color		Each
For UR3 and UR3e Series Robot Arms
2 1/8" 2 5/8"	3 1/4" 3 1/4"	10 7/8" 12 3/8"	0.018"	-60° to 200°	Cable Channel	1"	Black	00000000	000000

Pressure-Rated Borosilicate Glass Tubes

Color: Clear
Max. Temperature: See table
Fabrication: Annealed

These short glass tubes can be used as glass bowls in oil dispensers. Borosilicate glass resists clouding and pitting and is highly chemical resistant. With a low rate of thermal expansion, it stays dimensionally stable during changes in temperature.

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

OD	ID	Wall Thick.	Lg.	Max. Pressure, psi	Max. Temperature, °F	Edge Fabrication		Each
2 1/2"	2 1/8"	3/16"	2 3/8"	100	185°	Ground	0000000	000000

Tear-Resistant Silicone Foam Pipe Insulation

Temperature Range: -65° to 500° F
Heat Flow Rate: 0.39 Btu @ 75° F
Density: 45 lbs./cu. ft.
Color: Black

Even at high temperatures, these tubes remain flexible to stretch over components without tearing. They restrict absorption of water, air, and gas and are typically used on hot and cold water lines and electrical components.

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

3/8" Wall Thick.
ID	ID Tolerance Range	For Copper Tube Size	Lg., ft.	R Value	Flexibility		Each
2 1/8"	-0.5" to 0.5"	2	6	1	Flexible	00000000	0000000

Flexible Rubber Foam Pipe Insulation

Soft and easy to install, this insulation restricts absorption of water, air, and gas. It is often used on cold and hot water lines and refrigeration lines. Seal with contact adhesive (sold separately). To use outdoors, coat in acrylic paint.

Slit tubes have an adhesive strip closure.

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

Slit Tubes

Slit Tube

Temperature Range: -295° to 180° F
Heat Flow Rate: 0.25 Btu @ 75° F
Density: 4.5 lbs./cu. ft.
Color: Black
Specifications Met: ASTM E84 25/50 for Flame and Smoke, ASTM C534

1/2" Wall Thick.
ID	For Copper Tube Size	Lg., ft.	Flexibility	R Value		Each
2 1/8"	2	6	Flexible	2	00000000	000000
3/4" Wall Thick.
2 1/8"	2	6	Flexible	3	00000000	00000
1" Wall Thick.
2 1/8"	2	6	Flexible	4	00000000	00000

White Acrylic Coating (1-qt. Can)	00000000	Each	000000
Contact Adhesive (16-fl. oz. Brush-Top Can)	00000000	Each	00000

90° Elbows

Elbow

Temperature Range: -295° to 220° F
Heat Flow Rate: 0.25 Btu @ 75° F
Density: 4.5 lbs./cu. ft.
Color: Black
Specifications Met: ASTM E84 25/50 for Flame and Smoke, ASTM C534

3/8" Wall Thick.
ID	For Copper Tube Size	Flexibility	Tube Style	R Value		Each
2 1/8"	2	Flexible	Slit	1.5	00000000	00000
1/2" Wall Thick.
2 1/8"	2	Flexible	Slit	2	00000000	0000
3/4" Wall Thick.
2 1/8"	2	Flexible	Slit	3	00000000	00000
1" Wall Thick.
2 1/8"	2	Flexible	Slit	4	00000000	00000

White Acrylic Coating (1-qt. Can)	00000000	Each	000000
Contact Adhesive (16-fl. oz. Brush-Top Can)	00000000	Each	00000

Tees

Tee

Temperature Range: -295° to 220° F
Heat Flow Rate: 0.25 Btu @ 75° F
Density: 4.5 lbs./cu. ft.
Color: Black
Specifications Met: ASTM E84 25/50 for Flame and Smoke, ASTM C534

3/8" Wall Thick.
ID	For Copper Tube Size	Flexibility	Tube Style	R Value		Each
2 1/8"	2	Flexible	Slit	1.5	00000000	00000
1/2" Wall Thick.
2 1/8"	2	Flexible	Slit	2	00000000	0000
3/4" Wall Thick.
2 1/8"	2	Flexible	Slit	3	000000000	00000
1" Wall Thick.
2 1/8"	2	Flexible	Slit	4	000000000	00000

White Acrylic Coating (1-qt. Can)	00000000	Each	000000
Contact Adhesive (16-fl. oz. Brush-Top Can)	00000000	Each	00000

Economical Flexible Polyethylene Foam Pipe Insulation

Less flexible than rubber foam, this insulation restricts absorption of water, air, and gas. It is typically used in plumbing applications. Seal with contact adhesive (sold separately). To use outdoors, coat in acrylic paint.

Slit tubes have an adhesive strip closure.

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

Unslit Tubes

Unslit Tube

Temperature Range: 0° to 180° F
Heat Flow Rate: 0.270 Btu @ 75° F
Density: 1.5 lbs./cu. ft.
Color: Black
Specifications Met: ASTM E84 25/50 for Flame and Smoke

				3/8" Wall Thick.			1/2" Wall Thick.			3/4" Wall Thick.
ID	For Copper Tube Size	Lg., ft.	Flexibility	R Value		Each	R Value		Each	R Value		Each
2 1/8"	2	6	Flexible	1.4	00000000	00000	2	00000000	00000	3	00000000	000000

Contact Adhesive (16-fl. oz. Brush-Top Can)	00000000	Each	000000
White Acrylic Coating (1-qt. Can)	00000000	Each	00000

Slit Tubes

Slit Tube

Temperature Range: -295° to 200° F
Heat Flow Rate: 0.270 Btu @ 75° F
Density: 1.5 lbs./cu. ft.
Color: See table
Specifications Met: See table

3/8" Wall Thick.
ID	For Copper Tube Size	Lg., ft.	Flexibility	Specifications Met	R Value		Each
Black
2 1/8"	2	6	Flexible	ASTM E84 25/50 for Flame and Smoke, ASTM C1427 Type I	1.4	000000000	000000
1/2" Wall Thick.
Black
2 1/8"	2	6	Flexible	ASTM E84 25/50 for Flame and Smoke, ASTM C1427 Type I	2	000000000	00000
White
2 1/8"	2	6	Flexible	ASTM E84 25/50 for Flame and Smoke, ASTM C1427 Type I	2	000000000	00000
3/4" Wall Thick.
Black
2 1/8"	2	6	Flexible	ASTM E84 25/50 for Flame and Smoke, ASTM C1427 Type I	3	000000000	00000

Contact Adhesive (16-fl. oz. Brush-Top Can)	00000000	Each	000000
White Acrylic Coating (1-qt. Can)	00000000	Each	00000

90° Elbows

Elbow

Temperature Range: -330° to 210° F
Heat Flow Rate: 0.245 Btu @ 75° F
Density: 1.5 lbs./cu. ft.
Color: Black
Specifications Met: ASTM C1427 Type I, ASTM E84 25/50 for Flame and Smoke

				3/8" Wall Thick.			1/2" Wall Thick.
ID	For Copper Tube Size	Flexibility	Tube Style	R Value		Each	R Value		Each
2 1/8"	2	Flexible	Slit	1.5	0000000	00000	2	0000000	00000

Contact Adhesive (16-fl. oz. Brush-Top Can)	00000000	Each	000000
White Acrylic Coating (1-qt. Can)	00000000	Each	00000

Tees

Tee

Temperature Range: -330° to 210° F
Heat Flow Rate: 0.245 Btu @ 75° F
Density: 1.5 lbs./cu. ft.
Color: Black
Specifications Met: ASTM C1427 Type I, ASTM E84 25/50 for Flame and Smoke

				3/8" Wall Thick.			1/2" Wall Thick.
ID	For Copper Tube Size	Flexibility	Tube Style	R Value		Each	R Value		Each
2 1/8"	2	Flexible	Slit	1.5	0000000	00000	2	0000000	00000

Contact Adhesive (16-fl. oz. Brush-Top Can)	00000000	Each	000000
White Acrylic Coating (1-qt. Can)	00000000	Each	00000

Fiberglass Pipe Insulation

This common insulation material is typically used on hot and cold water lines and in process piping. To use outdoors, add metal jacketing.

Tubes, elbows, and tees are formed to provide the best fit on pipe and are the easiest to install. If your pipe is larger than the sizes we offer, choose a sheet/strip.

Tubes have an all-service jacket (ASJ) made of kraft paper with an adhesive strip closure. Seal with reinforced insulation tape (sold separately).

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

Tubes with Kraft Paper Jacketing

Tube

Temperature Range: 0° to 850° F
Jacket Temperature Range: -20° to 150° F
Heat Flow Rate: 0.23 Btu @ 75° F
Density: 4.5 lbs./cu. ft.
Color: Yellow
Jacket Color: White
Specifications Met: ASTM E84 25/50 for Flame and Smoke, ASTM C547, ASTM C585

1/2" Wall Thick.
ID	For Copper Tube Size	Lg., ft.	Flexibility	R Value		Each
2 1/8"	2	3	Rigid	2.2	0000000	000000
1" Wall Thick.
2 1/8"	2	3	Rigid	4.3	0000000	00000
1 1/2" Wall Thick.
2 1/8"	2	3	Rigid	6.5	0000000	00000
2" Wall Thick.
2 1/8"	2	3	Rigid	8.7	0000000	00000

Reinforced Insulation Tape (3" × 30 ft.)

00000000

Each

000000

90° Elbows

Elbow

Temperature Range: 0° to 1000° F
Heat Flow Rate: 0.23 Btu @ 75° F
Density: 5 lbs./cu. ft.
Color: Brown
Specifications Met: ASTM E84 25/50 for Flame and Smoke, ASTM C585

			1" Wall Thick.			1 1/2" Wall Thick.			2" Wall Thick.
ID	For Copper Tube Size	Flexibility	R Value		Each	R Value		Each	R Value		Each
2 1/8"	2	Rigid	4.3	00000000	000000	6.5	00000000	000000	8.7	00000000	000000

Tees

Tee

Temperature Range: 0° to 1000° F
Heat Flow Rate: 0.23 Btu @ 75° F
Density: 5 lbs./cu. ft.
Color: Brown
Specifications Met: ASTM E84 25/50 for Flame and Smoke, ASTM C585

			1" Wall Thick.			1 1/2" Wall Thick.			2" Wall Thick.
ID	For Copper Tube Size	Flexibility	R Value		Each	R Value		Each	R Value		Each
2 1/8"	2	Rigid	4.3	00000000	000000	6.5	00000000	000000	8.7	00000000	000000

Lightweight Melamine Foam Pipe Insulation

Temperature Range: -40° to 350° F
Jacket Temperature Range: -40° to 240° F
Heat Flow Rate: 0.27 Btu @ 75° F
Density: 0.44 lbs./cu. ft.
Color: Gray
Jacket Color: White
Specifications Met: ASTM E84 25/50 for Flame and Smoke

Melamine has a lightweight construction that allows quick and easy installation. Use on cold and hot water piping and with refrigeration systems. Insulation has an all-service jacket (ASJ) made of kraft paper with an adhesive strip closure. Seal seams with silicone sealant and join lengths with tape (both sold separately).

				1" Wall Thick.
ID	For Copper Tube Size	Lg., ft.	Flexibility	R Value		Each
Tubes with Kraft Paper Jacketing
2 1/8"	2	4	Rigid	7.4	00000000	000000

Tape (2" × 108 ft.)	00000000	Each	000000
Silicone Sealant (10.1-oz. Cartridge)	0000000	Each	00000

Sealing Grommets

Style 2

Styles 1-2

Create a tight seal around wire, cable, and cords with these grommets to keep out dust, debris, and moisture. Made of nitrile, all are abrasion, oil, and grease resistant. Use their aluminum flange to secure them to surfaces with screws. They can be used outdoors.

Styles 2, 4, 6, and 7 grommets have precut holes—select the proper ID to match your cable.

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

Nitrile Rubber with Aluminum Flange
Style	ID	Flange Dia. (D)	Overall Ht. (E)	Temp. Range, °F	For Use Outdoors	No. of Mount. Holes	Mounting Hole Dia.	Mounting Fasteners Included	Color		Each
2	2 1/8"	4 1/2"	0.29"	-20° to 220°	Yes	6	1/8"	No	Black	00000000	000000

Split Sealing Grommets

The two-piece design makes it easy to install and seal these grommets around wire, cable, and cords that are already in place. Use them to keep out dust, debris, and moisture. Made of nitrile rubber, all are abrasion, oil, and grease resistant. Use their aluminum flange to secure them to surfaces with screws. They can be used outdoors.

Grommets with a hard rating withstand high levels of impact.

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

Nitrile Rubber with Aluminum Flange
ID (C)	Flange Dia. (D)	Overall Ht. (E)	Hardness Rating	Hardness	Temp. Range, °F	For Use Outdoors	No. of Mount. Holes	Mounting Hole Dia.	Mounting Fasteners Included	Color		Each
2 1/8"	3"	0.14"	Hard	Durometer 70A	-20° to 220°	Yes	6	1/8"	No	Black	0000000	000000