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

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

For Tube OD
Inch	Sleeve Material		Each
Inch
2"	316 Stainless Steel	000000000	000000

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"	1 1/2	Air, Fuel Oil, Hydraulic Fluid, Mineral Oil	Zinc-Plated Steel	2,000 psi @ 72° F	-60° to 400°	00000000	0000000
2"	2	Air, Fuel Oil, Hydraulic Fluid, Mineral Oil	Zinc-Plated Steel	1,100 psi @ 72° F	-60° to 400°	00000000	00000

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

Straight Adapters, Male Tube × Flange

For Use With: Flange Code 61: Air, Fuel Oil, Hydraulic Fluid, Mineral Oil
Flange Code 62: Air, Cutting Oil, Fuel Oil, Hydraulic Fluid, Mineral Oil
Temperature Range: -30° to 250° F

Fittings with flange end bolt to equipment, or another same-size flange to create an access point within a line.

Flange Code 61
For Tube OD	For SAE Flange Size	Material	Max. Pressure		Each
2"	2	Zinc-Plated Steel	2,000 psi @ 72° F	00000000	0000000

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