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

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	System of Measurement System of Measurement

Inch

	Thread Size Thread Size	Show

1 7/8"-12

	Thread Size Thread Size	Hide

	Pipe Size Pipe Size

1 1/4

1 1/2

	Thread Type Thread Type

UN/UNF (SAE Straight)

UNJ/UNJF (JIC)

	Type Type


Connector	Adapter

Reducing Adapter	Nut

	Dash Size Dash Size

	For Tube OD For Tube OD

1 1/2"

	Shape Shape

	Straight

	Material Material

Stainless Steel

Steel

	Connection Style Connection Style

Threaded

Flared

	For Tube Material For Tube Material

Stainless Steel

Steel

	Length Length

	Gender Gender

Female

Male

	Nut Material Nut Material

Steel

Stainless Steel

	For Use With For Use With

	Maximum Pressure Maximum Pressure

	Connection Type Connection Type


Pipe	Tube

	DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense Acquisition Regulations Supplement)

DFARS Specialty Metals
COTS-Exempt

	Specifications Met Specifications Met

ASTM

ISO

SAE

	Body Shape Body Shape

	Hex

	RoHS (Restriction of Hazardous Substances) RoHS (Restriction of Hazardous Substances)

RoHS Compliant

RoHS Compliant with
Exemptions

	Finish Finish

Galvanized

Zinc Plated

	REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) REACH (Registration, Evaluation, Authorization and Restriction of Chemicals)

REACH Compliant

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21 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.

About Air Cylinders

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.

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

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

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.

NPTF (Dryseal) threads are compatible with NPT threads. BSPP and metric male threads have either a gasket, or a gasket and washer, to prevent leaks. 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.

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

Straight Connectors, Male

UN/UNF
(SAE Straight) Male
Threads with Gasket

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

UN/UNF (SAE Straight) Male
Thread Size	Dash Size	Max. Pressure	For Use With		Each
1 7/8"-12	24	3,000 psi @ 72° F	Air, Hydraulic Fluid, Water	000000000	0000000

Straight Adapters, Female × Male

BSPP and Metric
Male Threads with
Gasket and Washer

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)	Thread Size (A)	Dash Size (A)	Pipe Size (B)	Thread Size (B)	Dash Size (B)	Max. Pressure	For Use With	Specifications Met		Each
1	__	16	__	1 7/8"-12	24	3,000 psi @ 72° F	Air, Hydraulic Fluid, Water	ASTM A108	000000000	000000
UN/UNF (SAE Straight) Female × BSPP Male
__	1 7/8"-12	24	1 1/2	__	24	2,000 psi @ 72° F	Air, Hydraulic Fluid, Oil, Water	ISO 1179, ISO 11926, ISO 8434-6, SAE J1926	00000000	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)	Max. Pressure	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	3,000 psi @ 72° F	Air, Hydraulic Fluid, Water	ASTM A108	000000000	000000
1 5/16"-12	1 7/8"-12	16	24	3,000 psi @ 72° F	Air, Hydraulic Fluid, Water	ASTM A108	000000000	00000

Replacement Washers

Temperature Range: -20° to 230° F

For BSPP Male
For Pipe Size	Gasket Material	Thickness		Each
1 1/2	Buna-N Rubber	3.2mm	00000000	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 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
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: -420° to 1,200° F

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

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

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.

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

Straight Connectors, Tube

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

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

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.

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
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	000000

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	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.

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

			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	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
1 1/2"	1 1/2	Air, Fuel Oil, Hydraulic Fluid, Mineral Oil	Zinc-Plated Steel	1,500 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
1 1/2"	1 1/2	Zinc-Plated Steel	1,500 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
1 1/2"	Zinc-Plated Steel	1,500 psi @ 72° F	00000000	000000

Sleeves

For Use With: Air, Fuel Oil, Hydraulic Fluid, Mineral Oil
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 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 technical drawings and 3-D models, click on a part number.

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.

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

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"	270,200	000000	0000000