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

Filter by

System of Measurement

Inch

Pipe Size

Dash Size

Thread Size

Tube OD

Thread Type

UN/UNF (SAE Straight)

Material

Fitting Type

Connects To

Shape

Gender

Fitting Connection

Tube Material

For Use With

Flare Style

Maximum Pressure @ Temperature

Flanged Connection Surface

Fabrication

Export Control Classification Number (ECCN)

2B999

EAR99

U.S.–Mexico–Canada Agreement (USMCA) Qualifying

REACH

RoHS

Compliant with Exemptions

Not Compliant

DFARS Specialty Metals

Specifications Met

Maximum Temperature

1,000° F to 1,999.9° F

Forward

How can we improve?

15 Products

About Pipe and Fittings

Measure your pipe and fittings to identify their pipe size, thread size, schedule, and thread type. Then, find compatible components.

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.

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"	1723N27	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.

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°	50715K123	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	50715K142	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	50715K114	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.

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	5482K863	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	5482K866	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	5482K869	000000

Yor-Lok Fittings for Stainless Steel Tubing

BSPP and UN/UNF
(SAE Straight) Male
Threads with Gasket

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.

BSPP and UN/UNF (SAE Straight) male threads have a gasket to protect against leaks. UN/UNF (SAE Straight) threads are also known as O-ring boss threads.

Straight Adapters, Tube × Male Threaded Pipe

BSPP and UN/UNF
(SAE Straight) Male
Threads with Gasket

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, BSPT, 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

For Tube
OD	Wall Thick.	Thread Size	Material	Gasket Material	Max. Pressure	Temp. Range, °F		Each
UN/UNF (SAE Straight) Threads
2"	0.109"	2 1/2"-12	316 Stainless Steel	Fluoroelastomer Rubber	1,600 psi @ 72° F	-15° to 400°	5182K076	0000000

Front and Back Sleeves

Sleeves

Couple these sleeves with Yor-Lok nuts and fittings to create an extra-strong seal on stainless steel tubing. Sleeves are 316 stainless steel for excellent corrosion resistance. They are also known as ferrules.

For Tube			Front Sleeve		Back Sleeve
OD	Wall Thick.	Sleeve Material	Lg.	No. Included	Lg.	No. Included	Max. Pressure		Each
Sleeves
2"	0.109"	316 Stainless Steel	63/64"	1	25/64"	1	1,600 psi @ 72° F	5182K117	0000000

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.

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°	50695K54	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	50695K59	0000000

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	50695K758	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	50695K715	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	50695K765	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	50695K733	0000000