1 3/8"-12 Couplings | McMaster-Carr

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4 Products

About Air Cylinders

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.

Temperature Range: -65° to 250° F
Tubing: Use with seamless brass and copper that meets ASTM B280

No sleeve is required to assemble these fittings, which makes for a faster, more convenient installation compared to 37° flared fittings. They require a nut (sold separately) for each tube end. Fittings are also known as refrigeration and SAE fittings. They are brass for good corrosion resistance.

NPTF (Dryseal) threads are compatible with NPT threads.

Copper tube size is the accepted designation of the copper tubing industry, not the actual tube OD.

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

Straight Adapters, Tube × Male Threaded Pipe

For Use With: Air, Cutting Oil, Diesel Fuel, Fuel Oil, Mineral Oil, Refrigerant, Water; except adapters for 1/8" and 1" tube OD are not for use with fuel oil
Specifications Met: See table

For Tube
OD	Wall Thick.	Pipe Size	Material	Max. Pressure	Specifications Met		Each
NPTF Threads
1"	0.035"	3/4	Brass	350 psi @ 73° F	SAE J512, SAE J513	000000000	000000
1"	0.035"	1	Brass	350 psi @ 73° F	SAE J512, SAE J513	000000000	00000

Certified Lightweight Aluminum Rulers, Nuts

(A) Short Nut

For Use With: Air, Cutting Oil, Diesel Fuel, Fuel Oil, Mineral Oil, Refrigerant, Water; except nuts for 1" tube OD are not for use with fuel oil
Specifications Met: SAE J512, SAE J513, UL Listed; except nuts for 1" tube OD meet SAE J512 and SAE J513 only

	For Tube
	OD	Wall Thick.	Nut Material	Max. Pressure	Lg.		Each
Short Nuts
A	1"	0.035"	Brass	350 psi @ 73° F	1 13/16"	000000000	000000

Nuts for 45° Flared Fittings for Copper and Brass Tubing

(A) Short Nut

For Use With: Air, Cutting Oil, Diesel Fuel, Fuel Oil, Mineral Oil, Refrigerant, Water; except nuts for 1" tube OD are not for use with fuel oil
Temperature Range: -65° to 250° F
Tubing: Use with seamless brass and copper that meets ASTM B280
Specifications Met: SAE J512, SAE J513, UL Listed; except nuts for 1" tube OD meet SAE J512 and SAE J513 only

Use these nuts with 45° flared tube fittings to provide a tight metal-to-metal seal on flared copper and brass tubing. Nuts are brass for good corrosion resistance. They don’t require a sleeve, which makes for a fast, convenient installation.

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

	For Tube
	OD	Wall Thick.	Nut Material	Max. Pressure	Lg.		Each
Short Nuts
A	1"	0.035"	Brass	350 psi @ 73° F	1 13/16"	000000000	000000

Rod Alignment Couplers

Increase cylinder life by fixing alignment problems between air or hydraulic cylinders and driven components. Couplers have a threaded end that moves to compensate for the angle of misalignment, reducing wear on cylinder bearings and seals. Couplers have a male and female end.

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

Inch Sizes

Angle of Misalignment

1° of Misalignment
Thread Size	Body Material	OD	Lg.	Max. Pull Force, lbs.		Each
1 3/8"-12	Steel	2 1/2"	4 9/16"	40,710	000000	0000000