2 1/2"-12 Couplings | McMaster-Carr

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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.

Compact Extreme-Pressure Steel Threaded Pipe Fittings

These fittings are strong enough to handle extreme pressures, yet small enough to fit into cramped spaces. They are galvanized steel, which has fair corrosion resistance. UN/UNF (SAE) threads are also known as O-ring boss threads; the male threads have either a gasket or a gasket and washer to prevent leaks.

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

Straight Connectors, Male

UN/UNF (SAE) Male Threads with Gasket

For Use With: See table
Specifications Met:
NPTF and UN/UNF (SAE): ASTM A108
BSPP: ISO 1179, ISO 8434-6
BSPT: DIN EN 10226-1, ISO 7-1

UN/UNF (SAE) Male
Thread Size	Dash Size	Max. Pressure	For Use With		Each
2 1/2"-12	32	2,000 psi @ 72° F	Air, Hydraulic Fluid, Water	000000000	0000000

37° Flared Fittings for Stainless Steel Tubing

Tubing: Use with welded or seamless 304 or 316 stainless steel that meets ASTM A213, ASTM A249, or ASTM A269
Specifications Met: ISO 8434, SAE J514, except fittings with BSPP and BSPT threads meet SAE J514 only

Also known as JIC (Joint Industrial Council) fittings, these provide a tight metal-to-metal seal on tubing that is flared to 37°. They are 316 stainless steel for excellent corrosion resistance. Fittings require a nut and a sleeve (ferrule) for each tube end. Nuts and sleeves are sold separately.

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

Straight Adapters, Tube × Male Threaded Pipe

For Use With: See table
Temperature Range: See table

NPT Threads
For Tube OD	Pipe Size	For Use With	Material	Max. Pressure	Temp. Range, ° F		Each
2"	2	Air, Hydraulic Fluid, Isopropyl Alcohol, Natural Gas, Phosphoric Acid, Water	316 Stainless Steel	1,500 psi @ 72° F	-420 to 1200°	000000000	0000000

Nuts

For Use With: Air, Hydraulic Fluid, Isopropyl Alcohol, Natural Gas, Phosphoric Acid, Water
Temperature Range: -420° to 1,200° F

For Tube OD	Nut Material		Each
2"	316 Stainless Steel	000000000	0000000

Sleeves

For Use With: Air, Hydraulic Fluid, Isopropyl Alcohol, Natural Gas, Phosphoric Acid, Water
Temperature Range: -420° to 1,200° F

Use these sleeves with a nut and fitting to provide a tight metal-to-metal seal on stainless steel tubing that is flared to 37°. Sleeves are 316 stainless steel for excellent corrosion resistance. They are also known as ferrules.

For Tube OD
Inch	Sleeve Material		Each
Inch
2"	316 Stainless Steel	000000000	0000000

Nuts for 37° Flared Fittings for Stainless Steel Tubing

For Use With: Air, Hydraulic Fluid, Isopropyl Alcohol, Natural Gas, Phosphoric Acid, Water
Temperature Range: -420° to 1,200° F
Tubing: Use with seamless or welded 304 or 316 stainless steel that meets ASTM A213, ASTM A249, or ASTM A269
Specifications Met: ISO 8434, SAE J514

Use these nuts with a sleeve and fitting to provide a tight metal-to-metal seal on stainless steel tubing that is flared to 37°. Nuts are 316 stainless steel for excellent corrosion resistance.

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

For Tube OD	Nut Material		Each
2"	316 Stainless Steel	000000000	0000000

Precision AN 37° Flared Fittings for Stainless Steel Tubing

For Use With: Air, Cutting Oil, Fuel Oil, Hydraulic Fluid, Mineral Oil, Water
Temperature Range: -320° to 1200° F
Tubing: Use with seamless 304 or 316 stainless steel
Specifications Met: See Table

The threads on the tube end of these fittings are Class 3A or 3B and adhere to tighter tolerances than other 37° flared fittings. They are made to exact AS (formerly AN) specifications and provide a tight metal-to-metal seal on tubing that is flared to 37°. Fittings require a nut and a sleeve (ferrule) for each tube end. Nuts and sleeves are sold separately.

304 stainless steel fittings have very good corrosion resistance.

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

Straight Adapters, Tube × Male Threaded Pipe

				304 Stainless Steel
For Tube OD	Pipe Size	Max. Pressure	Specifications Met		Each
ANPT Threads
2"	2	1,500 psi @ 72° F	AN816-32J, ASTM A380, SAE AS4841	00000000	0000000

Nuts

			304 Stainless Steel
For Tube OD	Max. Pressure	Specifications Met		Each
2"	1,500 psi @ 72° F	AN818-32J, ASTM A380, SAE AS4841	00000000	0000000

Sleeves

			304 Stainless Steel
For Tube OD	Max. Pressure	Specifications Met		Each
2"	1,500 psi @ 72° F	AN819-32J, ASTM A380, MS20819, SAE AS4841	00000000	000000

37° Flared Fittings for Steel Tubing

Tubing: Use with seamless steel
Specifications Met: SAE J514

Also known as JIC (Joint Industrial Council) fittings, these provide a tight metal-to-metal seal on tubing that is flared to 37°. They require a nut and a sleeve (ferrule) for each tube end. Nuts and sleeves are sold separately. Fittings are zinc-plated steel for fair corrosion resistance.

NPTF (Dryseal) threads are compatible with NPT threads.

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

Straight Adapters, Male Tube × Male Threaded Pipe

For Use With: See Table
Temperature Range: See Table

NPTF Threads
For Tube OD	Pipe Size	For Use With	Material	Max. Pressure	Temp. Range, °F		Each
2"	2	Air, Fuel Oil, Hydraulic Fluid, Mineral Oil	Zinc-Plated Steel	1,100 psi @ 72° F	-60° to 400°	00000000	000000

Straight Adapters, Male Tube × Female Threaded Pipe

For Use With: Air, Fuel Oil, Hydraulic Fluid, Mineral Oil
Temperature Range: -60° to 400° F

NPTF Threads
For Tube OD	Pipe Size	Material	Max. Pressure		Each
2"	2	Zinc-Plated Steel	1,100 psi @ 72° F	00000000	000000

Nuts

For Use With: Air, Fuel Oil, Hydraulic Fluid, Mineral Oil
Temperature Range: -60° to 400° F

For Tube OD	Nut Material	Max. Pressure		Each
2"	Zinc-Plated Steel	1,100 psi @ 72° F	00000000	000000