28mm Tube Adapters | McMaster-Carr

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For Tube Wall Thickness

1.5 mm to 2 mm

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Maximum Vacuum @ Temperature

For Tube Fabrication

19 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.

A single sleeve (ferrule) bites into tubing as you tighten the nut, creating a strong seal. The nut and sleeve are included. Fittings are also known as flareless fittings or bite fittings. Use them in low- to medium-pressure applications.

316 stainless steel fittings have excellent corrosion resistance.

ISO and DIN fittings meet international dimensional standards.

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

Straight Adapters, Tube × Male Threaded Pipe

For Use With:
303 Stainless Steel, 316 Stainless Steel with 17-4 PH Stainless Steel Sleeve, and 360 Brass: Air, Water, Hydraulic Fluid
316 Stainless Steel: Air, Cutting Oil, Ethyl Alcohol, Fuel Oil, Gasoline, Hydraulic Fluid, Isopropyl Alcohol, Mineral Oil, Natural Gas, Steam, Water
Temperature Range: See table
Tubing: See table
Specifications Met:
316 Stainless Steel: ISO 8434, DIN 2353
316 Stainless Steel with 17-4 PH Stainless Steel Sleeve: SAE J514

For Tube
OD	Wall Thick.	Pipe Size	Material	Gasket Material	Sleeve Material	Max. Pressure	Temp. Range, °F	For Tube Material	For Tube Specifications Met	For Tube Fabrication		Each
NPT Threads
28mm	1.5-2mm	1	316 Stainless Steel	__	316 Stainless Steel	2,300 psi @ 72° F	-75° to 750°	304 Stainless Steel, 316/316L/316Ti Stainless Steel	DIN EN 10216-5, DIN EN 10305-1	Seamless	00000000	000000
BSPP Threads
28mm	1.5-2mm	1	316 Stainless Steel	Fluoroelastomer Rubber	316 Stainless Steel	3,600 psi @ 72° F	-10° to 390°	304 Stainless Steel, 316/316L/316Ti Stainless Steel	DIN EN 10216-5, DIN EN 10305-1	Seamless	00000000	00000

Straight Connectors, Tube

For Use With:
316 Stainless Steel with 17-4 PH Stainless Steel Sleeve: Air, Water, Hydraulic Fluid
316 Stainless Steel: Air, Cutting Oil, Ethyl Alcohol, Fuel Oil, Gasoline, Hydraulic Fluid, Isopropyl Alcohol, Mineral Oil, Natural Gas, Steam, Water
Temperature Range:
316 Stainless Steel with 17-4 PH Stainless Steel Sleeve: -420° to 1200° F
316 Stainless Steel: -75° to 750° F
Tubing:
316 Stainless Steel with 17-4 PH Stainless Steel Sleeve: Use with welded or seamless 304 or 316 stainless steel that meets ASTM A269
316 Stainless Steel: Use with seamless 304 or 316/316L/316Ti stainless steel that meets DIN EN 10216-5 or DIN EN 10305-1
Specifications Met:
316 Stainless Steel with 17-4 PH Stainless Steel Sleeve: SAE J514
316 Stainless Steel: ISO 8434, DIN 2353

For Tube
OD	Wall Thick.	Material	Sleeve Material	Max. Pressure		Each
28mm	1.5-2mm	316 Stainless Steel	316 Stainless Steel	3,600 psi @ 72° F	0000000	0000000

90° Elbow Connectors, Tube

For Use With:
316 Stainless Steel with 17-4 PH Stainless Steel Sleeve: Air, Water, Hydraulic Fluid
316 Stainless Steel: Air, Cutting Oil, Ethyl Alcohol, Fuel Oil, Gasoline, Hydraulic Fluid, Isopropyl Alcohol, Mineral Oil, Natural Gas, Steam, Water
Temperature Range:
316 Stainless Steel with 17-4 PH Stainless Steel Sleeve: -420° to 1200° F
316 Stainless Steel: -75° to 750° F
Tubing:
316 Stainless Steel with 17-4 PH Stainless Steel Sleeve: Use with welded or seamless 304 or 316 stainless steel that meets ASTM A269
316 Stainless Steel: Use with seamless 304 or 316/316L/316Ti stainless steel that meets DIN EN 10216-5 or DIN EN 10305-1
Specifications Met:
316 Stainless Steel with 17-4 PH Stainless Steel Sleeve: SAE J514
316 Stainless Steel: ISO 8434, DIN 2353

For Tube
OD	Wall Thick.	Material	Sleeve Material	Max. Pressure		Each
28mm	1.5-2mm	316 Stainless Steel	316 Stainless Steel	3,600 psi @ 72° F	0000000	0000000

Nuts

For Use With: See table
Temperature Range: See table
Tubing: See table
Specifications Met: See table

For Tube
OD	Wall Thick.	Nut Material	Max. Pressure	For Use With	Temp. Range, °F	For Tube Material	For Tube Specifications Met	For Tube Fabrication	Specifications Met		Each
28mm	1.5-2mm	316 Stainless Steel	3,600 psi @ 72° F	Air, Cutting Oil, Ethyl Alcohol, Fuel Oil, Gasoline, Hydraulic Fluid, Isopropyl Alcohol, Mineral Oil, Natural Gas, Steam, Water	-75° to 750°	304 Stainless Steel, 316/316L/316Ti Stainless Steel	DIN EN 10216-5, DIN EN 10305-1	Seamless	DIN 2353, ISO 8434-1	0000000	000000

Sleeves

For Use With:
17-4 PH Stainless Steel: Air, Hydraulic Fluid, Water
316 Stainless Steel: Air, Cutting Oil, Ethyl Alcohol, Fuel Oil, Gasoline, Hydraulic Fluid, Isopropyl Alcohol, Mineral Oil, Natural Gas, Steam, Water
Temperature Range:
17-4 PH Stainless Steel: -420° to 1200° F
316 Stainless Steel: -75° to 750° F
Tubing:
17-4 PH Stainless Steel: Use with welded or seamless 304 or 316 stainless steel that meets ASTM A269
316 Stainless Steel: Use with seamless 304 or 316/316L/316Ti stainless steel that meets DIN EN 10216-5 or DIN EN 10305-1
Specifications Met:
17-4 PH Stainless Steel: SAE J514
316 Stainless Steel: ISO 8434-1, DIN 2353

For Tube
OD	Wall Thick.	Sleeve Material	Max. Pressure		Each
28mm	1.5-2mm	316 Stainless Steel	3,600 psi @ 72° F	0000000	00000

Solder-Connect Fittings for Copper Tubing

Temperature Range: 32° to 200° F

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

Straight Connectors with Center Stop, Female Socket-Connect Tube

For Use With: Drinking Water
Tubing: See table
Specifications Met: See table

Fittings with center stop have a small internal ridge that prevents the tubing from sliding all the way through the fitting.

Fittings that meet ASTM B379 comply with international standards for tube fitting specifications.

For Tube OD	Material	Max. Pressure	For Copper Tube Type	Specifications Met		Each
28mm	Copper	400 psi @ 72° F	M	ASTM B379, DVGW GW 8, EN 1057	00000000	00000

Compression Fittings for Steel Tubing

BSPP and UN/UNF
(SAE Straight) Male
Threads with Gasket

For Use With: Inch: Air, Hydraulic Fluid, Water
Metric: Hydraulic Fluid
Tubing: Inch: Use with welded steel
Metric: Use with seamless steel
Specifications Met: Inch: SAE J514
Metric: ISO 8434, DIN 2353

A single sleeve (ferrule) bites into tubing as you tighten the nut, creating a strong seal. The nut and sleeve are included. Fittings are also known as flareless and bite fittings.

Zinc-plated steel fittings have fair corrosion resistance.

NPTF (Dryseal) threads are compatible with NPT threads. BSPP male threads have either a gasket or a gasket and washer to prevent leaks. ISO 8434 (formerly DIN 2353) fittings meet international standards for tube fitting pressures.

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

Straight Adapters, Tube × Male Threaded Pipe

BSPP and UN/UNF
(SAE Straight) Male
Threads with Gasket

Temperature Range: See table

For Tube
OD	Wall Thick.	Pipe Size	Material	Gasket Material	Max. Pressure	Temp. Range, °F		Each
NPT Threads
28mm	__	1	Zinc-Plated Steel	__	2,300 psi @ 72° F	-75° to 750°	00000000	000000
NPTF Threads
28mm	Not Rated	1	Zinc-Plated Steel	__	2,300 psi @ 72° F	-20° to 230°	00000000	00000
BSPP Threads
28mm	__	3/4	Zinc-Plated Steel	Buna-N Rubber	3,600 psi @ 72° F	-20° to 212°	00000000	00000
28mm	Not Rated	1	Zinc-Plated Steel	Buna-N Rubber	2,300 psi @ 72° F	-20° to 230°	0000000	00000

Straight Connectors, Tube

Temperature Range: See table

For Tube
OD	Wall Thick.	Material	Max. Pressure	Temp. Range, °F		Each
28mm	Not Rated	Zinc-Plated Steel	2,300 psi @ 72° F	-20° to 230°	00000000	000000

90° Elbow Connectors, Tube

Temperature Range: See table

For Tube
OD	Wall Thick.	Material	Max. Pressure	Temp. Range, °F		Each
28mm	Not Rated	Zinc-Plated Steel	2,300 psi @ 72° F	-20° to 230°	00000000	000000

Tee Connectors, Tube

Temperature Range: -20° to 230° F

For Tube
OD, mm	Wall Thick.	Material	Max. Pressure		Each
28	Not Rated	Zinc-Plated Steel	2,300 psi @ 72° F	00000000	0000000

Nuts

Temperature Range: See table

For Tube OD	Nut Material	Max. Pressure	Temp. Range, °F		Each
28mm	Zinc-Plated Steel	2,300 psi @ 72° F	-20° to 230°	00000000	000000

Sleeves

Temperature Range: See table

For Tube OD	Sleeve Material	Max. Pressure	Temp. Range, °F		Each
28mm	Zinc-Plated Steel	2,300 psi @ 72° F	-20° to 230°	00000000	00000

Push-to-Connect Tube Fittings for Drinking Water

Temperature Range: 35° to 150° F
Tubing: See table
Specifications Met: NSF/ANSI 61

Made of moisture-resistant acetal, these fittings won't absorb water and lose strength, even in high-humidity environments. Also known as instant fittings, they connect to tubing with a push, and an internal gripping ring and O-ring hold the tubing tight. To disconnect, push on the release ring and pull the tubing out of the fitting. All meet NSF/ANSI 61 for use in drinking water systems.

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

Straight Connectors, Tube

					For Tube
For Tube OD	Material	Color	Release Ring Color	Max. Pressure	Material		Each
28mm	Acetal Plastic	Black	Black	150 psi @ 72° F	Nylon Plastic, Polyethylene Plastic	00000000	000000

90° Elbow Connectors, Tube

					For Tube
For Tube OD	Material	Color	Release Ring Color	Max. Pressure	Material		Each
28mm	Acetal Plastic	Black	Black	150 psi @ 72° F	Nylon Plastic, Polyethylene Plastic	00000000	000000

Tee Connectors, Tube

					For Tube
For Tube OD	Material	Color	Release Ring Color	Max. Pressure	Material		Each
28mm	Acetal Plastic	Black	Black	150 psi @ 72° F	Nylon Plastic, Polyethylene Plastic	00000000	000000

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How to Identify and Measure Fittings

Compression Fittings for Stainless Steel Tubing

Solder-Connect Fittings for Copper Tubing

Compression Fittings for Steel Tubing

Push-to-Connect Tube Fittings for Drinking Water