1 5/8"-12 Couplings | McMaster-Carr

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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.

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. 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 a gasket to prevent leaks.

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

Straight Adapters, Female × Male

Straight Adapter

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

Specifications Met: See table
For Use With: See table

						316 Stainless Steel
Thread Size (A)	Dash Size (A)	Thread Size (B)	Max. Pressure	For Use With	Specifications Met		Each
UN/UNF (SAE Straight) Female × Metric Male
1 5/8"-12	20	M42 × 2 mm	2,000 psi @ 72° F	Hydraulic Fluid (Petroleum Base), Oil, Water	ISO 8434-1, SAE J514	000000000	000000

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 5/8"-12	20	3,000 psi @ 72° F	3,000 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 and 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.

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	Material	For Use With		Each
1 5/8"-12	20	4,000 psi @ 72° F	Zinc Plated Steel	Air, Hydraulic Fluid, Water	000000000	000000

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 5/8"-12	20	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 5/8"-12	12	20	1"	4,000 psi @ 72° F	Zinc Plated Steel	Air, Hydraulic Fluid, Water	ASTM A108	000000000	000000

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 1/4"	1 1/4	Air, Hydraulic Fluid, Isopropyl Alcohol, Natural Gas, Phosphoric Acid, Water	316 Stainless Steel	3,000 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 1/4"	1 1/4	316 Stainless Steel	2,500 psi @ 72° F	-380° to 800°	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 1/4"	316 Stainless Steel	000000000	000000

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 1/4"	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 1/4"	316 Stainless Steel	000000000	000000

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 1/4"	1 1/4	1,500 psi @ 72° F	AN816-20J, ASTM A380, SAE AS4841	00000000	0000000

Nuts

304 Stainless Steel
For Tube OD	Max. Pressure	Specifications Met		Each
1 1/4"	1,500 psi @ 72° F	AN818-20J, ASTM A380, SAE AS4841	00000000	000000

Sleeves

304 Stainless Steel
For Tube OD	Max. Pressure	Specifications Met		Each
1 1/4"	1,500 psi @ 72° F	AN819-20J, 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.

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

304 Stainless Steel
For Tube OD	Max. Pressure	Specifications Met		Each
1 1/4"	1,500 psi @ 72° F	AN818-20J, ASTM A380, SAE AS4841	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
1 1/4"	1	Zinc-Plated Steel	3,000 psi @ 72° F	-60° to 400°	000000000	000000
1 1/4"	1 1/4	Zinc-Plated Steel	2,000 psi @ 72° F	-60° to 400°	00000000	00000

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 1/4"	1 1/4	Zinc-Plated Steel	2,000 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 1/4"	1 1/4	Zinc-Plated Steel	2,500 psi @ 72° F	000000000	000000

Straight Connectors, Male Tube

Temperature Range: -60° to 400° F

For Tube OD	Material	Max. Pressure		Each
1 1/4"	Zinc-Plated Steel	2,000 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 1/4"	1 1/4	Zinc-Plated Steel	1,150 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 1/4"	Zinc-Plated Steel	2,000 psi @ 72° F	00000000	00000

Nuts

Temperature Range: -60° to 400° F

For Tube OD	Nut Material	Max. Pressure		Each
1 1/4"	Zinc-Plated Steel	2,000 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 1/4"	Zinc-Plated Steel	2,000 psi @ 72° F	00000000	000000

Nuts for 37° Flared Fittings for Aluminum Tubing

For Use With: Air, Coolant, Gasoline, Hydraulic Fluid, Water
Temperature Range: -60° to 350° F
Tubing: Use with seamless aluminum

Use these nuts with a sleeve and fitting to provide a tight metal-to-metal seal on aluminum tubing that is flared to 37°. Nuts are aluminum, which is lightweight with good corrosion resistance.

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

For Tube OD	Nut Material	Max. Pressure		Each
1 1/4"	Anodized 2024 Aluminum	1,500 psi @ 72° F	0000000	000000