25mm Tube Adapters | McMaster-Carr

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	System of Measurement System of Measurement

Inch

Metric

	For Tube OD For Tube OD	Show

25mm

	For Tube OD For Tube OD	Hide

	Type Type


Adapter	Clamp

Nut

	Shape Shape

	Straight

	Connection Style Connection Style

	Material Material

Stainless Steel

Steel

	Pipe Size Pipe Size

3/4

	Thread Type Thread Type

NPT

	Connection Type Connection Type


Pipe	Tube

	For Tube Material For Tube Material

Stainless Steel

Steel

	For Tube Fabrication For Tube Fabrication

Seamless

Welded

	Length Length

	Specifications Met Specifications Met

ASME

DIN

ISO

	For Use With For Use With

	DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense Acquisition Regulations Supplement)

DFARS Specialty Metals
COTS-Exempt

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

REACH Compliant

	RoHS (Restriction of Hazardous Substances) RoHS (Restriction of Hazardous Substances)

RoHS Compliant

	Gender Gender

Male

Female

	Flange OD Flange OD

1.984"

50.5mm

	For Tube Wall Thickness For Tube Wall Thickness

2-3mm

2.2mm

Not Rated

	Maximum Pressure Maximum Pressure

2,900 psi @ 72° F

5,800 psi @ 72° F

725 psi @ 300 ° F

	Nut Material Nut Material

Stainless Steel

Steel

	Maximum Temperature Maximum Temperature

26 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 nut with two sleeves (ferrules) gives these fittings extra gripping power. The sleeves bite into tubing as you tighten the nut, creating a strong seal. Also known as instrumentation fittings, they are made to tight tolerances for use in high-precision applications. They are compatible with Swagelok®, Let-Lok, and A-Lok fittings.

316 stainless steel fittings have excellent corrosion resistance.

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

Straight Adapters, Tube × Male Threaded Pipe

For Use With:
Inch:
NPT and BSPT Threads: Air, Cutting Oil, Fuel Oil, Gasoline, Hydraulic Fluid, Mineral Oil, Natural Gas, Steam, Water
BSPP Threads: Air, Cutting Oil, Fuel Oil, Gasoline, Mineral Oil, Water
UN/UNF (SAE Straight) Threads: Air, Cutting Oil, Fuel Oil, Gasoline, Hydraulic Fluid, Mineral Oil
Metric:
NPT, BSPT, and UN/UNF (SAE Straight) Threads: Air, Cutting Oil, Fuel Oil, Gasoline, Hydraulic Fluid, Mineral Oil, Natural Gas, Steam, Water
Tubing:
Inch:
NPT and UN/UNF (SAE Straight) Threads: Use with welded or seamless 304/304L or 316/316L stainless steel that meets ASTM A213, ASTM A249, or ASTM A269
BSPP and BSPT Threads: Use with seamless 304 or 316 stainless steel that meets ASTM A269
Metric:
NPT and BSPT Threads: Use with welded or seamless 304/304L or 316/316L stainless steel that meets ASTM A213, ASTM A249, or ASTM A269
UN/UNF (SAE Straight) Threads: Use with welded or seamless 304/304L or 316/316L stainless steel that meets ASTM A213, ASTM A249, or ASTM A269

For Tube
OD	Wall Thick.	Pipe Size	Material	Max. Pressure	Temp. Range, °F		Each
NPT Threads
25mm	2mm to 3mm	1	316 Stainless Steel	2,900 psi @ 72° F	-420° to 1200°	00000000	000000

Straight Adapters, Tube × Female Threaded Pipe

For Use With: Air, Cutting Oil, Fuel Oil, Gasoline, Hydraulic Fluid, Mineral Oil, Natural Gas, Steam, Water
Tubing:
Inch:
NPT Threads: Use with welded or seamless 304/304L or 316/316L stainless steel that meets ASTM A213, ASTM A249, or ASTM A269
BSPP and BSPT Threads: Use with seamless 304 or 316 stainless steel that meets ASTM A269
Metric:
NPT Threads: Use with welded or seamless 304/304L or 316/316L stainless steel that meets ASTM A213, ASTM A249, or ASTM A269

For Tube
OD	Wall Thick.	Pipe Size	Material	Max. Pressure	Temp. Range, °F		Each
NPT Threads
25mm	2 to 3 mm	3/4	316 Stainless Steel	2,900 psi @ 72° F	-420° to 1200°	00000000	000000

Front and Back Sleeves

For Tube
OD	Wall Thick.	Sleeve Material	Max. Pressure	Temp. Range, °F		Each
25mm	2 to 3 mm	316 Stainless Steel	2,900 psi @ 72° F	-420° to 1200°	00000000	000000

High-Polish Metal Quick-Clamp Sanitary Tube Fittings

Temperature Range: See Gaskets

The smooth finish inside these fittings makes it easy to remove product residue. Also known as aseptic and tri-clamp fittings, they connect with a gasket, a clamp, and another quick-clamp fitting for a fast and easy way to access your line. The pressure rating of the fitting will vary depending on the clamp you choose, and the temperature rating will vary based on the gasket material you choose.

316 stainless steel fittings have excellent corrosion resistance.

Fittings that meet DIN standards adhere to international requirements for sanitary quick-clamp fittings.

Note: To complete a connection, you’ll need two quick-clamp fittings, a clamp, and a gasket (all sold separately).

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

Straight Adapters, Tube × Metric Tube

For Use With: Air, Beverage, Dairy, Food, Water
Tubing: Use with welded 304/304L or 316/316L stainless steel
Specifications Met: DIN 32676

For Tube OD		Flange OD			316 Stainless Steel
Quick Clamp	Metric Quick Clamp, mm	Quick Clamp	Metric Quick Clamp, mm	Wall Thick.		Each
1"	25	1.984"	50.5	0.136"	0000000	0000000

Clamps

304 Stainless Steel with Wing Nut

304 Stainless Steel with Wing Nut, Spring Loaded

304 Stainless Steel with Bolt

316 Stainless Steel with Wing Nut and 2-Pin Hinge

316 Stainless Steel with Safety Wing Nut and 2-Pin Hinge

316 Stainless Steel with Double Bolt

316 Stainless Steel with
Recessed Nut, Hole for
Lockout, and 2-Pin Hinge

White Nylon Plastic with Wing Nut

Clamps with wing nut tighten by hand. Clamps with bolt tighten with a wrench. They handle higher pressures than wing-nut clamps for a stronger, more secure hold.

304 Stainless Steel with Wing Nut
For Tube OD	For Flange OD	Bolt Material	Max. Pressure	For Tube Specifications Met	Specifications Met		Each
1", 1 1/4", 1 1/2"	1.984"	__	500 psi @ 72 ° F	ASTM A269, ASTM A270	__	00000000	000000
304 Stainless Steel with Wing Nut, Spring Loaded
1", 1 1/4", 1 1/2"	1.984"	__	500 psi @ 72 ° F	ASTM A269, ASTM A270	__	0000000	00000
304 Stainless Steel with Bolt
1", 1 1/4", 1 1/2"	1.984"	304 Stainless Steel	1,500 psi @ 72 ° F	ASTM A269, ASTM A270	__	00000000	00000
316 Stainless Steel with Wing Nut and 2-Pin Hinge
1", 1 1/4", 1 1/2"	1.984"	__	700 psi @ 72 ° F	__	__	0000000	00000
316 Stainless Steel with Safety Wing Nut and 2-Pin Hinge
1", 1 1/4", 1 1/2"	1.984"	__	720 psi @ 72 ° F	__	__	0000000	00000
316 Stainless Steel with Double Bolt
1", 1 1/4", 1 1/2"	1.984"	316 Stainless Steel	2,400 psi @ 72 ° F	__	ASME BPVC.VIII	0000000	000000
316 Stainless Steel with Recessed Nut, Hole for Lockout, and 2-Pin Hinge
1", 1 1/4", 1 1/2"	1.984"	__	720 psi @ 72 ° F	__	__	0000000	00000
White Nylon Plastic with Wing Nut
1", 1 1/4", 1 1/2"	1.984"	__	150 psi @ 72 ° F	ASTM A269, ASTM A270	__	00000000	00000

Gasket Fittings—Male Straight Adapters, Gasket × Standard Tube

For Tube OD
Gasket Connection	Standard Connection	Wall Thick.	Material	For Tube Specifications Met	Includes		Each
1"	1"	0.065"	316 Stainless Steel	ASTM A269, ASTM A270	304 Stainless Steel Nut	0000000	0000000

Gasket Fittings—Female Straight Adapters, Gasket × Standard Tube

For Tube OD
Gasket Connection	Standard Connection	Wall Thick.	Material	For Tube Specifications Met		Each
1"	1"	0.065"	316 Stainless Steel	ASTM A269, ASTM A270	0000000	000000

Extra-Support Fittings—Male Straight Adapters, Extra-Support Tube × Standard Tube

	Flange OD
For Tube OD	Extra-Support Connection	Standard Connection	Wall Thick.	Material	For Tube Specifications Met		Each
1"	1.995"	1.984"	0.065"	316 Stainless Steel	ASTM A269, ASTM A270	0000000	000000

Extra-Support Fittings—Female Straight Adapters, Extra-Support Tube × Standard Tube

	Flange OD
For Tube OD	Extra-Support Connection	Standard Connection	Wall Thick.	Material	For Tube Specifications Met		Each
1"	1.995"	1.984"	0.065"	316 Stainless Steel	ASTM A269, ASTM A270	0000000	000000

Clamps for High-Polish Metal Quick-Clamp Sanitary Tube Fittings

Temperature Range: See Gaskets or O-Rings
Tubing:
Inch 304 Stainless Steel and Nylon Plastic: Use with welded 304/304L and 316/316L stainless steel that meets ASTM A269 or ASTM A270
Metric 304 Stainless Steel: Use with welded 304/304L and 316/316L stainless steel
Inch 316 Stainless Steel: Use with welded 304/304 L and 316/316L stainless steel
Metric 316 Stainless Steel: Use with welded 316/316L Stainless Steel

Connect quick-clamp sanitary tube fittings—also known as aseptic fittings—for a fast and easy way to access your line. Clamps with wing nut tighten by hand.

316 stainless steel clamps are more corrosion resistant than 304 stainless steel clamps.

Clamps that meet DIN 11864 or DIN 32676 adhere to international standards for sanitary quick-clamp fittings.

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

Clamps

316 Stainless Steel with Wing Nut

316 Stainless Steel with Wing Nut
For Tube OD	For Flange OD	Max. Pressure	Specifications Met		Each
20mm, 25mm	50.5mm	725 psi @ 300° F	DIN 11864	0000000	000000

Gaskets and O-Rings

The temperature rating of the fitting will vary depending on the gasket or O-ring material you choose. EPDM resists water and steam and works well in humid environments. Fluoroelastomer stands up to fuel, oil, and acid condensates. PTFE withstands harsh chemicals, with the exception of molten alkali metal and elemental fluorine.

O-Rings
For Tube OD	ID	OD	Temp. Range, °F	Color	Specifications Met		Each
EPDM Rubber
20mm	22.000mm	29.000mm	32° to 280°	Black	3-A Certified 18-00	0000000	000000
Viton® Fluoroelastomer Rubber
20mm	22.000mm	29.000mm	32° to 300°	Black	3-A Certified 18-00	0000000	00000
PTFE Plastic
20mm	22.000mm	29.000mm	32° to 280°	White	3-A Certified 18-00	0000000	00000

High-Pressure Compression Fittings for Steel Tubing

For Use With: Hydraulic Fluid
Specifications Met: DIN 2353, ISO 8434

Thicker walls make these fittings—sometimes called flareless or bite fittings—withstand about twice as much pressure as standard compression fittings, so they’re good for hydraulic power applications. Their single sleeve, or ferrule, bites into tubing as you tighten the nut, creating a seal that is leak tight even at high heat. The nut and sleeve are included. All meet ISO 8434 (formerly DIN 2353), which is an international standard for tube fitting pressures.

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

Straight Adapters, Tube × Male Threaded Pipe

Temperature Range: See table
Tubing: Use with seamless steel

For Tube
OD, mm	Wall Thickness	Pipe Size	Material	Maximum Pressure	Temperature Range, °F		Each
NPT Threads
25	Not Rated	1	Steel	5,800 psi @ 72° F	-75° to 750°	00000000	000000

Nuts

Temperature Range: -75° to 750° F
Tubing: Use with seamless steel

For Tube OD, mm	Nut Material	Maximum Pressure		Each
25	Steel	6,000 psi @ 72° F	0000000	000000

Sleeves

Temperature Range: -75° to 750° F
Tubing: Use with seamless steel

For Tube OD, mm	Sleeve Material	Maximum Pressure		Each
25	Steel	6,000 psi @ 72° F	0000000	00000

Yor-Lok Fittings for Steel Tubing

For Use With: Air, Cutting Oil, Diesel Fuel, Fuel Oil, Gasoline, Hydraulic Fluid, Mineral Oil
Tubing: Use with seamless steel
Specifications Met: See table

These fittings include a nut with two sleeves (ferrules) for extra gripping power. The sleeves bite into tubing as you tighten the nut, creating a strong seal. Also known as instrumentation fittings, they are made to tight tolerances for use in high-precision applications. Fittings are zinc-plated steel for fair corrosion resistance. They are compatible with Swagelok®, Let-Lok, and A-Lok fittings.

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

Straight Adapters, Tube × Male Threaded Pipe

For Tube
OD	Wall Thick.	Pipe Size	Material	Max. Pressure	Temp. Range, °F	Specifications Met		Each
NPT Threads
25mm	2.2mm	3/4	Zinc-Plated Steel	2,900 psi @ 72° F	-20° to 800°	ASME B31.3	00000000	000000
25mm	2.2mm	1	Zinc-Plated Steel	2,900 psi @ 72° F	-20° to 800°	ASME B31.3	00000000	00000

Nuts

For Tube
OD	Wall Thick.	Nut Material	Max. Pressure	Temp. Range, °F	Specifications Met		Each
25mm	2.2mm	Zinc-Plated Steel	2,900 psi @ 72° F	-20° to 800°	ASME B31.3	00000000	00000

Nuts for Yor-Lok Fittings for Steel Tubing

For Use With: Air, Mineral Oil, Fuel Oil, Gasoline, Diesel Fuel, Cutting Oil, Hydraulic Fluid
Temperature Range: See table
Tubing: Use with seamless steel
Specifications Met: See table
Compatible With: Let-Lok, Parker A-Lok, Swagelok®

Use these nuts with Yor-Lok sleeves and fittings to create an extra-strong seal on steel tubing. They are zinc-plated steel for fair corrosion resistance.

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

For Tube
OD	Wall Thick.	Nut Material	Max. Pressure	Temp. Range, °F	Specifications Met		Each
25mm	2.2mm	Zinc-Plated Steel	2,900 psi @ 72° F	-20° to 800°	ASME B31.3	00000000	00000

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How to Identify and Measure Fittings

Yor-Lok Fittings for Stainless Steel Tubing

High-Polish Metal Quick-Clamp Sanitary Tube Fittings

Clamps for High-Polish Metal Quick-Clamp Sanitary Tube Fittings

High-Pressure Compression Fittings for Steel Tubing

Yor-Lok Fittings for Steel Tubing

Nuts for Yor-Lok Fittings for Steel Tubing