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

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For Tube Fabrication

13 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.

High-Pressure Stainless Steel Threaded SAE Pipe Flanges

Also known as Code 61 SAE hydraulic flanges, these let you create an access point in a high-pressure hydraulic line. To connect, bolt flanges to equipment, or bolt a flange with an O-ring groove surface to a flange with a flat surface of the same size. Flanges are 316 stainless steel for excellent corrosion resistance. UN/UNF (SAE Straight) threads are also known as O-ring boss threads.

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

Flanges with Flat Surface on Back

Front

Back

Specifications Met: SAE J518, ISO 6162
For Use With: Hydraulic Fluid

				Flange					Bolt Hole			316/316L Stainless Steel
Thread Size	SAE Flange Size	Dash Size	Max. Pressure	Ht.	Wd.	Dp.	Mounting Hardware Included	For Bolt Dia.	Dia.	No. of	Ctr.-to-Ctr.		Each
UN/UNF (SAE Straight)
2 1/2"-12	2	32	3,000 psi @ 72° F	4"	3 1/4"	1 45/64"	No	1/2"	0.531"	4	1.688", 3.062"	0000000	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 withstand high pressure, so they’re often used in hydraulic applications. Made from 316 stainless steel, they resist corrosion from water and chemicals. A complete fitting requires 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

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, SAE AS5176	00000000	000000

37° Flared Fittings for Steel Tubing

For Use With: Air, Cutting Oil, Fuel Oil, Hydraulic Fluid, Mineral Oil
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

Temperature Range: See table

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

Straight Adapters, Male Tube × Female Threaded Pipe

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 (Swivels Until Tightened), Female Tube × Female Threaded Pipe

Temperature Range: -60° to 400° F

Fittings that swivel until tightened have a built-in nut that rotates 360° for easy installation.

Fittings with female tube end have an internal flare that mates with the male tube end of another fitting.

NPTF Threads
For Tube OD	Pipe Size	Material	Max. Pressure		Each
2"	2	Zinc-Plated Steel	1,500 psi @ 72° F	000000000	0000000

Straight Connectors, Male Tube

Temperature Range: -60° to 400° F

For Tube OD	Material	Max. Pressure		Each
2"	Zinc-Plated Steel	1,125 psi @ 72° F	000000000	000000

Through-Wall Straight Connectors, Male Tube

Temperature Range: -60° to 400° F

Through-wall fittings are also known as bulkhead couplings and panel-mount couplings; they mount through your wall or panel to create an inlet or outlet.

For Tube OD	Material	Max. Pressure		Each
2"	Zinc-Plated Steel	2,000 psi @ 72° F	000000000	0000000

90° Elbow Adapters, Male Tube × Male Threaded Pipe

Temperature Range: NPT: -65° to 400° F
NPTF and BSPT: -60° to 400° F
Metric and BSPP with O-Rings: -30° to 200°F
BSPP with Washers: -20° to 212° F

NPTF Threads
For Tube OD	Pipe Size	Material	Max. Pressure		Each
2"	2	Zinc-Plated Steel	1,000 psi @ 72° F	000000000	000000