3 1/4" Tubing | McMaster-Carr

	REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) REACH (Registration, Evaluation, Authorization and Restriction of Chemicals)

REACH Compliant

	Maximum Pressure Maximum Pressure

25 psi @ 72° F

30 psi @ 72° F

95 psi @ 72° F

Not Rated

	Length Length

	Comparable To Comparable To

26 Products

About Hose

About Durometer Hardness Scales

About Duct Hose

About Plastic

About Plastic and Rubber Tubing

About Selecting Thermal Insulation

About Stainless Steel

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

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 1/4"	3 1/2"	1/8"	95 psi @ 72 ° F	Clear	0000000	000000	000000	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.
0.016" Material Thick.
3 1/4"	3 3/8"	10 1/2"	Ribbed	1 to 50	0000000	000000	000000	000000	000000	000000	000000	0000000	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 1/4"	3 3/8"	2"	60%	15 in. of Hg @ 72° F	30 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 1/4"	3 5/8"	25 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
3 1/4"	3 5/8"	30 psi @ 72° F	25	00000000	000000	000000

Multipurpose 4140 Alloy Steel Tubes

Yield Strength: 60,000 psi
Hardness: Rockwell B85 (Medium)
Heat Treatable: Yes
Max. Hardness After Heat Treatment: Rockwell C60
Specifications Met: ASTM A519

Also known as chrome-moly steel, this versatile 4140 alloy steel is used for a wide range of parts, such as gears, axles, shafts, collets, and die holders. It resists fracturing from repeated stress.

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.

3/4" Wall Thick. (-0.075" to 0.075" Tolerance)
OD	OD Tolerance	ID	Heat Treatment	Straightness Tolerance		1 ft. Lg.	3 ft. Lg.	6 ft. Lg.
4 3/4"	-0.037" to 0.037"	3 1/4"	Annealed (Softened)	0.030" per ft.	0000000	0000000	0000000	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 ORDER HISTORY 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

1/4" Wall Thick. (-0.031" to 0.031" 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.
3 3/4"	-0.015" to 0.015"	3 1/4"	30,000	Seamless	Not Rated	ASTM A511	0.045" per ft.	00000000	0000000	0000000	0000000	0000000
3/8" Wall Thick. (-0.047" to 0.047" Tolerance)
4"	-0.015" to 0.015"	3 1/4"	30,000	Seamless	Not Rated	ASTM A511	0.045" per ft.	00000000	000000	000000	000000	000000

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.
1/4" Wall Thick. (-0.031" to 0.031" Tolerance)
3 3/4"	-0.031" to 0.031"	3 1/4"	Seamless	1500°	0.045" per 3 ft.	ASTM A511	0000000	0000000	0000000	0000000	0000000
3/8" Wall Thick. (-0.047" to 0.047" Tolerance)
4"	-0.031" to 0.031"	3 1/4"	Seamless	1500°	0.045" per 3 ft.	ASTM A511	00000000	000000	000000	000000	000000

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.
3 1/2"	-0.030" to 0.030"	3 1/4"	1, 3, 5	ASTM D5436, FDA Compliant 21 CFR 177.1010, UL 94 HB	00000000	000000
1/4" Wall Thick.
3 3/4"	-0.030" to 0.030"	3 1/4"	1, 3, 5	ASTM D5436, FDA Compliant 21 CFR 177.1010, UL 94 HB	00000000	00000
3/8" Wall Thick.
4"	-0.045" to 0.045"	3 1/4"	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
3 1/2"	-0.025" to 0.025"	3 1/4"	-0.025" to 0.025"	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.
3 1/2"	-0.020" to 0.020"	3 1/4"	-0.020" to 0.020"	FDA Compliant 21 CFR 177.1580, UL 94 HB	0000000	000000	000000	000000	000000	0000000

Clear Cellulose Tubes

Color: Clear
Max. Temperature: 170° F
Tensile Strength: 6,300 psi (Good)
Impact Strength: 4.5 ft.-lbs./in (Good)
Hardness: Rockwell R78 (Hard)
For Use Outdoors: No

Widely used as shipping tubes, these thin-walled tubes provide good clarity at an economical price. They are made of cellulose, which is also known as butyrate.

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

1/8" Wall Thick. (-0.0125" to 0.0125")
OD	OD Tolerance	ID	ID Tolerance	Lg., ft.		Each
3 1/2"	-0.040" to 0.040"	3 1/4"	-0.040" to 0.040"	6	000000	000000

Slippery UHMW Polyethylene Tubes

These impact- and wear-resistant tubes offer 360° protection from scrapes and strikes to wires, cords, and anything that can slide through them. UHMW has a low-friction surface that resists sticking and binding.

Tight-tolerance tubes, also known as bushing stock, slide over rods and inside shafts to increase or decrease the diameter. Their precise sizing allows ascending sizes to fit inside each other to create a thicker wall.

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

Tight-Tolerance Tubes

Color: White
Temperature Range: -20° to 180° F
Tensile Strength: 4,350-5,800 psi (Poor)
Impact Strength: 16.8 ft.-lbs./in. (Excellent)
Hardness: Durometer 65D-67D (Medium)
For Use Outdoors: No
Specifications Met: ASTM D4020

				6" Lg.
OD	OD Tolerance	ID	ID Tolerance		Each
1/4" Wall Thick. (-0.06" to 0")
3 3/4"	-0.030" to 0.000"	3 1/4"	0.000" to 0.030"	0000000	000000

Snap-In Pipe and Tubing Grommets

These grommets have two flanges that snap around holes and flex to compensate for misalignment and movement of pipe and tubing. They're often used for routing applications in panel walls. Made of plastic, these grommets are chemical resistant and won't dry out and become brittle when exposed to UV rays. All have a medium-hard rating to withstand high levels of impact. They can be used outdoors.

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

Vinyl Plastic
For Hole Dia. (A)	For OD	For Pipe Size	For Material Thick. (B)	ID (C)	Flange Dia. (D)	Overall Ht. (E)	Hardness Rating	Hardness	Temp. Range, °F	For Use Outdoors	Color		Each
4 7/8"	3.37"-3.5"	3	0.05"-0.12"	3 1/4"	5 3/8"	0.82"	Medium Hard	Durometer 60A	-40° to 200°	Yes	Black	00000000	00000

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.

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

Unslit Tubes

Unslit Tube

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

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

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

Round Shipping Tubes with Press-On End Caps

Close these tubes with a cap on each end. Use them to mail and protect blueprints, posters, long parts, and rods.

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

Tubes								Extra End Caps
ID	Inside Lg.	Thick.	Color	End Cap Material	End Caps Included		Each		Each
Laminated Cardboard
3 1/4"	39"	0.15"	Brown	Steel	Yes	0000000	000000	0000000	00000
3 1/4"	51"	0.15"	Brown	Steel	Yes	0000000	00000	0000000	0000
3 1/4"	63"	0.15"	Brown	Steel	Yes	0000000	00000	0000000	0000