1 7/8"-12 Couplings | McMaster-Carr

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Exempt

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2B999

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SAE Pipe Flange Size

For Tube Fabrication

Bolt Hole Diameter

37 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.

Combine an adapter with a two-piece pipe flange (sold separately) to build a customized flange connection. Also known as Code 61 or Code 62 split flanges, the two halves of the flange clamp around the adapter and bolt to another Code 61 or Code 62 flange. Flanges and adapters are 316 stainless steel which has excellent corrosion resistance. UN/UNF (SAE Straight) threads are also known as O-ring boss threads; they have a gasket to prevent leaks.

Male Adapters

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

						316/316L Stainless Steel
Thread Size	For SAE Flange Size	Dash Size	Lg.	Max. Pressure	For Flanged Connection Surface		Each
UN/UNF (SAE Straight)
1 7/8"-12	1 1/2	24	3 9/64"	3,000 psi @ 72° F	O-Ring Groove	0000000	0000000

Two-Piece Flanges

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

			Flange						For Bolt			316/316L Stainless Steel
SAE Flange Size	Dash Size	Max. Pressure	Ht.	Wd.	Dp.	Flanged Connection Surface	Mounting Hardware Included	For Bolt Dia.	Dia.	No. of	Ctr.-to-Ctr.		Each
Inch
1 1/2	24	3,000 psi @ 72° F	3 11/16"	3 1/4"	1"	O-Ring Groove	Yes	1/2"	0.531"	4	1.406", 2 3/4"	0000000	0000000
Metric
1 1/2	24	3,000 psi @ 72° F	94mm	83mm	25mm	O-Ring Groove	Yes	12mm	13mm	4	36mm, 70mm	0000000	000000

Extreme-Pressure Stainless Steel Threaded Pipe Fittings

With the strength to handle extreme pressures, these fittings can be used to connect equipment in hydraulic fluid lines. 316 stainless steel fittings have excellent corrosion resistance.

NPTF (Dryseal) threads are compatible with NPT threads. UN/UNF (SAE Straight) threads are also known as O-ring boss threads; the male threads have a gasket to prevent leaks.

Straight Adapters, Male

Front

UN/UNF
(SAE Straight) Male
Threads with Gasket

For Use With: See table
Specifications Met: See table

								316 Stainless Steel
Pipe Size (A)	Dash Size (A)	Thread Size (B)	Dash Size (B)	Max. Pressure	Max. Steam Pressure	For Use With	Specifications Met		Each
NPTF Male × UN/UNF (SAE Straight) Male
1 1/4	20	1 7/8"-12	24	2,400 psi @ 72° F	2,400 psi @ 200° F	Hydraulic Fluid, Oil, Steam, Water	SAE J514	000000000	0000000

High-Pressure 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 for use in noncorrosive environments. UN/UNF (SAE Straight) threads are also known as O-ring boss threads.

Flanges with Flat Surface on Back

Front

Back

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

				Flange					Bolt Hole
Thread Size	Dash Size	SAE Flange Size	Max. Pressure	Ht.	Wd.	Dp.	Mounting Hardware Included	For Bolt Dia.	Dia.	No. of	Ctr.-to-Ctr.		Each
UN/UNF (SAE Straight)
1 7/8"-12	24	1 1/2	3,000 psi @ 72° F	3 3/4"	2 3/4"	1 3/4"	No	0.438"	1/2"	4	1.406", 2.75"	0000000	000000

Flanges with O-Ring Groove Surface on Back

Front

Back

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

				Flange					Bolt Hole
Thread Size	Dash Size	SAE Flange Size	Max. Pressure	Ht.	Wd.	Dp.	Mounting Hardware Included	For Bolt Dia.	Dia.	No. of	Ctr.-to-Ctr.		Each
UN/UNF (SAE Straight)—Inch
1 7/8"-12	24	2	3,000 psi @ 72° F	4"	3 1/4"	1 3/4"	Yes	1/2"	0.53"	4	1.688", 3.063"	0000000	000000
UN/UNF (SAE Straight)—Metric
1 7/8"-12	24	1 1/2	3,000 psi @ 72° F	95mm	70mm	44mm	Yes	12mm	13.3mm	4	36mm, 70mm	0000000	00000

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 zinc-plated steel, which have better corrosion resistance than plain steel fittings.

NPTF (Dryseal) threads are compatible with NPT threads. UN/UNF (SAE Straight) threads are also known as O-ring boss threads; the male threads have either a gasket or a gasket and washer to prevent leaks.

Straight Adapters, Female × Male

UN/UNF
(SAE Straight) Male
Threads with Gasket

For Use With: See table
Specifications Met: See table

NPTF Female × UN/UNF (SAE Straight) Male
Pipe Size (A)	Dash Size (A)	Thread Size (B)	Dash Size (B)	Max. Pressure	Material	For Use With	Specifications Met		Each
1	16	1 7/8"-12	24	3,000 psi @ 72° F	Zinc Plated Steel	Air, Hydraulic Fluid, Water	ASTM A108	000000000	000000

Straight Reducing Adapters, Female × Male

UN/UNF
(SAE Straight) Male
Threads with Gasket

For Use With: See table
Specifications Met: See table

Thread Size		Dash Size
(A)	(B)	(A)	(B)	Lg.	Max. Pressure	Material	For Use With	Specifications Met		Each
UN/UNF (SAE Straight) Female × UN/UNF (SAE Straight) Male
1 1/16"-12	1 7/8"-12	12	24	1"	3,000 psi @ 72° F	Zinc Plated Steel	Air, Hydraulic Fluid, Water	ASTM A108	000000000	000000
1 5/16"-12	1 7/8"-12	16	24	1"	3,000 psi @ 72° F	Zinc Plated Steel	Air, Hydraulic Fluid, Water	ASTM A108	000000000	00000

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
1 1/2"	1 1/2	Air, Hydraulic Fluid, Isopropyl Alcohol, Natural Gas, Phosphoric Acid, Water	316 Stainless Steel	2,000 psi @ 72° F	-420° to 1200°	000000000	0000000

Straight Adapters, Tube × Female Threaded Pipe

For Use With: Air, Hydraulic Fluid, Isopropyl Alcohol, Natural Gas, Phosphoric Acid, Water
Temperature Range: See table

NPT Threads
For Tube OD	Pipe Size	Material	Max. Pressure	Temp. Range, °F		Each
1 1/2"	1 1/2	316 Stainless Steel	2,000 psi @ 72° F	-420° to 1200°	000000000	0000000

Straight Adapters (Swivels Until Tightened), Female Tube × Male Threaded Pipe

For Use With: See table
Temperature Range: See table

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.

NPT Threads
For Tube OD	Pipe Size	For Use With	Material	Max. Pressure	Temp. Range, °F		Each
1 1/2"	1 1/2	Air, Hydraulic Fluid, Isopropyl Alcohol, Natural Gas, Phosphoric Acid, Water	316 Stainless Steel	2,000 psi @ 72° F	-420° to 1200°	000000000	0000000

Straight Connectors, Tube

For Use With: Air, Hydraulic Fluid, Isopropyl Alcohol, Natural Gas, Phosphoric Acid, Water
Temperature Range: See Table

For Tube OD	Material	Max. Pressure	Temp. Range, °F		Each
1 1/2"	316 Stainless Steel	2,000 psi @ 72° F	-420° to 1200°	000000000	0000000

90° Elbow 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
1 1/2"	1 1/2	Air, Hydraulic Fluid, Isopropyl Alcohol, Natural Gas, Phosphoric Acid, Water	316 Stainless Steel	2,000 psi @ 72° F	-420° to 1200°	000000000	0000000

90° Elbow Adapters (Swivels Until Tightened), Tube × Female Tube

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

For Tube OD	Material	Max. Pressure		Each
1 1/2"	316 Stainless Steel	2,000 psi @ 72° F	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
1 1/2"	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
1 1/2"	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 Tube OD	Nut Material		Each
1 1/2"	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.

Straight Adapters, Tube × Male Threaded Pipe

304 Stainless Steel
For Tube OD	Pipe Size	Max. Pressure	Specifications Met		Each
ANPT Threads
1 1/2"	1 1/2	1,500 psi @ 72° F	ASTM A380, SAE AS4841, SAE AS9100D, SAE AS9104/1	00000000	0000000

Nuts

304 Stainless Steel
For Tube OD	Max. Pressure	Specifications Met		Each
1 1/2"	1,500 psi @ 72° F	AN818-24J, ASTM A380, SAE AS4841	00000000	0000000

Sleeves

304 Stainless Steel
For Tube OD	Max. Pressure	Specifications Met		Each
1 1/2"	1,500 psi @ 72° F	AN819-24J, ASTM A380, MS20819, SAE AS4841, SAE AS5176	00000000	000000

Nuts for 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

Use these nuts with precision AN sleeves and fittings to provide a tight metal-to-metal seal on stainless steel tubing that is flared to 37°. The threads are Class 3B and adhere to tighter tolerances than other nuts. They are made to exact AS (formerly AN) specifications.

304 stainless steel nuts have very good corrosion resistance. 316 stainless steel nuts have excellent corrosion resistance.

304 Stainless Steel
For Tube OD	Max. Pressure	Specifications Met		Each
1 1/2"	1,500 psi @ 72° F	AN818-24J, ASTM A380, SAE AS4841	00000000	0000000
316 Stainless Steel
1 1/2"	1,500 psi @ 72° F	AN818-24K, ASTM A380, SAE AS4841	00000000	00000

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
1 1/2"	0.095"	1 7/8"-12	316 Stainless Steel	Fluoroelastomer Rubber	1,800 psi @ 72° F	-15° to 400°	00000000	0000000

Nuts

Use these nuts with Yor-Lok sleeves and fittings to create an extra-strong seal on stainless steel tubing. They are 316 stainless steel for excellent corrosion resistance.

For Tube
OD	Wall Thick.	Nut Material	Max. Pressure	Temp. Range, °F		Each
1 1/2"	0.095"	316 Stainless Steel	1,800 psi @ 72° F	-420° to 1200°	00000000	000000

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
1 1/2"	0.095"	316 Stainless Steel	41/64"	1	17/64"	1	1,800 psi @ 72° F	00000000	000000

PTFE Sleeves

For Tube OD	Sleeve Material	Max. Pressure	Temp. Range, °F		Each
1 1/2"	PTFE Plastic	Not Rated	-65° to 350°	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.

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
1 1/2"	1	Zinc-Plated Steel	3,000 psi @ 72° F	-60° to 400°	000000000	000000
1 1/2"	1 1/2	Zinc-Plated Steel	1,500 psi @ 72° F	-60° to 400°	00000000	00000
1 1/2"	2	Zinc-Plated Steel	2,000 psi @ 72° F	-60° to 400°	000000000	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
1 1/2"	1 1/2	Zinc-Plated Steel	1,500 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
1 1/2"	1 1/2	Zinc-Plated Steel	2,000 psi @ 72° F	000000000	000000

Straight Connectors, Male Tube

Temperature Range: -60° to 400° F

For Tube OD	Material	Max. Pressure		Each
1 1/2"	Zinc-Plated Steel	1,500 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
1 1/2"	Zinc-Plated Steel	3,000 psi @ 72° F	000000000	000000

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
1 1/2"	1 1/2	Zinc-Plated Steel	1,000 psi @ 72° F	000000000	000000

Sleeves

Temperature Range: -60° to 400° F

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

For Tube OD
Inch	Sleeve Material	Max. Pressure		Each
Inch Sleeves
1 1/2"	Zinc-Plated Steel	1,500 psi @ 72° F	00000000	000000

Nuts

Temperature Range: -60° to 400° F

For Tube OD	Nut Material	Max. Pressure		Each
1 1/2"	Zinc-Plated Steel	1,500 psi @ 72° F	00000000	000000

Nuts for 37° Flared Fittings for Steel Tubing

For Use With: Air, Fuel Oil, Hydraulic Fluid, Mineral Oil
Temp. Range: -60° to 400° F
Tubing: Use with seamless steel
Specifications Met: SAE J514

Use these nuts with a sleeve and fitting to provide a tight metal-to-metal seal on steel tubing that is flared to 37°. They are zinc-plated steel for fair corrosion resistance.

For Tube OD	Nut Material	Max. Pressure		Each
1 1/2"	Zinc-Plated Steel	1,500 psi @ 72° F	00000000	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.

Inch Sizes

Angle of Misalignment

5° of Misalignment
Thread Size	Body Material	OD	Lg.	Max. Pull Force, lbs.		Each
1 7/8"-12	Steel	5"	8 5/8"	67,550	000000	0000000

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How to Identify and Measure Fittings

High-Pressure Stainless Steel Threaded SAE Two-Piece Pipe Flanges

Extreme-Pressure Stainless Steel Threaded Pipe Fittings

High-Pressure Steel Threaded SAE Pipe Flanges

Compact Extreme-Pressure Steel Threaded Pipe Fittings

37° Flared Fittings for Stainless Steel Tubing

Nuts for 37° Flared Fittings for Stainless Steel Tubing

Precision AN 37° Flared Fittings for Stainless Steel Tubing

Nuts for Precision AN 37° Flared Fittings for Stainless Steel Tubing

Yor-Lok Fittings for Stainless Steel Tubing

37° Flared Fittings for Steel Tubing

Nuts for 37° Flared Fittings for Steel Tubing

Rod Alignment Couplers