3 3/4" Tubing | McMaster-Carr

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REACH Compliant

	Aluminum Performance Properties Aluminum Performance Properties

Corrosion Resistant

Easy to Machine

Easy to Weld

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13 Products

About Hose

About Duct Hose

About Plastic

About Plastic and Rubber Tubing

About Aluminum

About Stainless Steel

High-Pressure Hard Plastic Tubing for Air and Water

Excellent strength and durability allow this tubing to handle high-pressure air and water applications.

Polycarbonate tubing won’t degrade when exposed to the damaging effects of ultraviolet light. It should be used at temperatures above freezing. Tubing is clear, so you can easily monitor flow. It is rigid and does not bend.

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

Clear Polycarbonate Plastic

Clear Polycarbonate Plastic Tubing

Rigid
Compatible with Socket Connect Tube Fittings
Hard (Rockwell R120)
Temperature Range: 32° to 250°F

Inch
ID	OD	Wall Thick.	Max. Pressure	Color		2 ft.	4 ft.	8 ft.
3 3/4"	4"	1/8"	80 psi @ 72 ° F	Clear	0000000	000000	000000	0000000

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.
0.016" Material Thick.
3 3/4"	4 1/16"	12"	Ribbed	1 to 50	0000000	000000	000000	000000	000000	000000	000000	000000	0000000	0000000

High-Temperature Flexible Duct Hose for Dust

Flexible
Compatible Clamps: Worm-Drive Clamps
Color: Black
Temperature Range: -60° to 300° F

The neoprene coating on this hose holds up under high heat. Hose meets UL 94 V-0 for flame retardance. It has a smooth interior for unrestricted flow. Hose is for use with lint, dust, and sawdust.

Warning: Hose should not be used for applications that generate a static charge.

								Spiral					Per Ft.
ID	OD	Bend Radius	Compresses To	Max. Vacuum	Max. Pressure	Material Thick.	Interior Surface Texture	Direction	Material	Specifications Met	Max. Continuous Lg., ft.		1-11	12-Up
Neoprene-Coated Fiberglass
3 3/4"	3 7/8"	2"	60%	14 in. of Hg @ 72° F	26 psi @ 72° F	0.024"	Smooth	Left Hand	Metal	UL 94 V-0	12	00000000	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
3 3/4"	4 1/8"	10 psi @ 72° F	Yarn	12	00000000	000000	000000

Coolant Hose

Temperature Range: 0° to 210° F
Material: Blended 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
3 3/4"	4 1/8"	25 psi @ 72° F	25	00000000	000000	000000

Multipurpose 6061 Aluminum Round Tubes

Yield Strength: 35,000 psi
Hardness: Brinell 95 (Soft)
Temper: See table
Fabrication: Extruded
Specifications Met: See table

The most widely used aluminum, 6061 is fabricated into everything from pipe fittings and containers to automotive and aerospace parts. It is strong and corrosion resistant, plus it's easy to machine and weld.

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 ACTIVITY after your order ships.

1/8" Wall Thick. (-0.02" to 0.02" Tolerance)
OD	OD Tolerance	ID	Temper	Heat Treatment	Temperature Range, °F	Specifications Met	Straightness Tolerance		1/2 ft. Lg.	1 ft. Lg.	2 ft. Lg.	3 ft. Lg.	6 ft. Lg.
4"	-0.035" to 0.035"	3 3/4"	T6	Hardened	-320° to 300°	ASTM B221	0.020" per ft.	0000000	000000	000000	000000	000000	0000000

Multipurpose 304 Stainless Steel

From cookware to chemical-processing equipment, 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.

304/304L stainless steel contains less carbon than standard 304 for better weldability.

Seamless round tubes are more corrosion resistant than welded tubes because they don’t have a seam that could potentially introduce impurities.

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 ACTIVITY after your order ships.

304/304L Stainless Steel Round Tubes

Yield Strength: See Table
Hardness: See Table
Heat Treatment: Annealed (Softened)
Heat Treatable: No
Specifications Met: See Table

3/8" Wall Thick. (-0.047" to 0.047" Tolerance)
OD	OD Tolerance	ID	Yield Strength, psi	Fabrication	Hardness	Specifications Met	Straightness Tolerance		1/2 ft. Lg.	1 ft. Lg.	2 ft. Lg.	4 ft. Lg.
4 1/2"	-0.015" to 0.015"	3 3/4"	30,000	Seamless	Not Rated	ASTM A511	0.045" per ft.	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.

1/8" Wall Thick.
OD	OD Tolerance	ID	Lengths, ft.	Specifications Met		Per Ft.
4"	-0.045" to 0.045"	3 3/4"	1, 3, 5	ASTM D5436, FDA Compliant 21 CFR 177.1010, UL 94 HB	00000000	000000
1/4" Wall Thick.
4 1/4"	-0.045" to 0.045"	3 3/4"	1, 3, 5	ASTM D5436, FDA Compliant 21 CFR 177.1010, UL 94 HB	00000000	00000
3/8" Wall Thick.
4 1/2"	-0.045" to 0.045"	3 3/4"	1, 3, 5	ASTM D5436, FDA Compliant 21 CFR 177.1010, UL 94 HB	00000000	000000

Clear Scratch- and UV-Resistant Acrylic Tubes

Color: Clear
Temperature Range: -40° to 180° F
Tensile Strength; 9,195-11,030 (Good)
Impact Strength: 0.040 ft.-lbs./in.
Hardness: Rockwell M89-M96 (Hard)
For Use Outdoors: Yes
Specifications Met: UL 94 HB

When compared to cast acrylic tubes, these extruded acrylic tubes offer nearly the same performance at a fraction of the cost. Use them for sight gauges and protective covers. This scratch- and UV-resistant 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.

Round Tubes

1/8" Wall Thick.
OD	OD Tolerance	ID	ID Tolerance	Lg., ft.		Each
4"	-0.030" to 0.030"	3 3/4"	-0.030" to 0.030"	6	0000000	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

1/8" Wall Thick. (-0.01" to 0.01")
OD	OD Tolerance	ID	ID Tolerance	Specifications Met		1 ft. Lg.	2 ft. Lg.	3 ft. Lg.	4 ft. Lg.	8 ft. Lg.
4"	-0.025" to 0.025"	3 3/4"	-0.025" to 0.025"	FDA Compliant 21 CFR 177.1580, UL 94 HB	0000000	000000	000000	000000	0000000	0000000

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
4 1/4"	3 3/4"	1/4"	5"	50	125°	Ground	0000000	000000