1/2"-20 Nipples | McMaster-Carr

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	System of Measurement System of Measurement

Inch

	Thread Size Thread Size	Show

1/2"-20

	Thread Size Thread Size	Hide

	Thread Type Thread Type

UN/UNF (SAE Straight)

	Pipe Size Pipe Size

1/8

1/4

	Type Type

	Adapter

	Shape Shape

	Straight

	Material Material

Brass

Stainless Steel

Steel

	Dash Size Dash Size

	For Use With For Use With

	Connection Style Connection Style

Threaded

Barbed

Flared

	Gender Gender

Male

Female

	For Tube OD For Tube OD

5/16"

	Specifications Met Specifications Met

ISO

Mil. Spec.

SAE

	Flared Angle Flared Angle

37°

45°

	Length Length

	Connection Type Connection Type


Pipe	Hose

Tube

	Hex Width Hex Width

5/8"

	Body Shape Body Shape

	Hex

	Maximum Steam Pressure Maximum Steam Pressure

6,000 psi @ 200° F

	Flared Connection Type Flared Connection Type


Standard	Internal

	Maximum Pressure Maximum Pressure

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

RoHS Compliant

RoHS Compliant with
Exemptions

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

REACH Compliant

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23 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. 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
1/4	04	1/2"-20	05	6,000 psi @ 72° F	6,000 psi @ 200° F	Hydraulic Fluid, Oil, Steam, Water	SAE J514	000000000	000000

Metal Barbed Hose Fittings for Air and Water

Slide the barbed end into rubber hose and secure with the appropriate clamp or crimp-on hose ferrule.

Brass fittings are softer than other metal fittings, so they’re easier to thread together. Plain brass fittings have good corrosion resistance. Fittings with a threaded end are also known as hose nipples.

Fittings with a 45° flared end are also known as refrigeration and SAE fittings.

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

Straight Adapters, Hose × UN/UNF (SAE 45°) Male Flared Tube

Maximum Pressure: 250 psi @ 72° F
Temperature Range: -40° to 160° F
Attachment Type: Use Crimp-On Hose Ferrules, except For 1/2" Hose ID: Use Band-and-Buckle Clamps
Specifications Met: SAE J476

Brass
For Hose ID	For Tube OD	Thread Size	Pkg. Qty.		Pkg.
5/16"	5/16"	1/2"-20	5	0000000	000000

Metal Push-On Barbed Hose Fittings for Air and Water

Fittings have sharper barbs than standard barbed hose fittings to grip rubber push-on hose with no clamps or ferrules required. The more you pull on the fittings, the tighter the hose will grip.

Brass fittings are softer than other metal fittings, so they’re easier to thread together. They have good corrosion resistance.

Fittings with a flared end meet JIC or SAE standards for dimensions. Fittings with a 45° flared end are also known as refrigeration and SAE fittings. Fittings with a female 37° and 45° flared end have a dual-angle seat that accepts both 37° and 45° flared fittings.

The optional installation tool (sold separately) allows you to connect large quantities of barbed fittings to push-on hose. Use the built-in cutter to squarely cut the hose without fraying. Next, lubricate either the push-on hose, fitting or both. Then, clamp the hose into the tool’s vise and apply light pressure on the handle to drive into the fitting.

Note: To ensure proper connection, the barbed end has to be pushed in all the way, with the hose end concealed by the ring.

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

Straight Adapters, Hose × UN/UNF (Tube End) Male 45° Flared Tube

Maximum Pressure: 300 psi @ 72° F
Temperature Range: -20° to 150° F
Specifications Met: SAE J512

Adapters
			Ring Stop					Replacement Ring Stops
For Hose ID	For Tube OD	Thread Size	Material	Color	Pkg. Qty.		Pkg.	Pkg. Qty.		Pkg.
Brass
1/4"	5/16"	1/2"-20	Plastic	Yellow	5	00000000	000000	25	000000000	00000

Straight Adapters, Hose × UN/UNF (Tube End) Female 37° and 45° Flared Tube

Maximum Pressure: 300 psi @ 72° F
Temperature Range: -20° to 150° F
Specifications Met: SAE J512, SAE J514

Adapters
			Ring Stop					Replacement Ring Stops
For Hose ID	For Tube OD	Thread Size	Material	Color	Pkg. Qty.		Pkg.	Pkg. Qty.		Pkg.
Brass
1/4"	5/16"	1/2"-20	Plastic	Yellow	5	00000000	000000	25	000000000	00000

Installation Tool

				Mounting Hole
For Hose ID Range	Lg.	Ht.	Dp.	Dia.	No. of	Mounting Fasteners Included		Each
1/4" to 3/4"	13 1/2"	7"	2 3/8"	7/16"	4	No	00000000	0000000

45° Flared Fittings for Copper and Brass Tubing

Temperature Range: -65° to 250° F
Tubing: Use with seamless brass and copper that meets ASTM B280

No sleeve is required to assemble these fittings, which makes for a faster, more convenient installation compared to 37° flared fittings. They require a nut (sold separately) for each tube end. Fittings are also known as refrigeration and SAE fittings. They are brass for good corrosion resistance.

NPTF (Dryseal) threads are compatible with NPT threads.

Copper tube size is the accepted designation of the copper tubing industry, not the actual tube OD.

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

Straight Adapters, Tube × Male Threaded Pipe

For Use With:
NPTF Threads: Air, Cutting Oil, Diesel Fuel, Fuel Oil, Mineral Oil, Refrigerant, Water; except adapters for 1/8" and 1" tube OD are not for use with fuel oil
BSPT Threads: Air, Cutting Oil, Diesel Fuel, Mineral Oil, Refrigerant, Water
Specifications Met: See table

For Tube
OD	Wall Thick.	Pipe Size	Material	Max. Pressure	Specifications Met		Each
NPTF Threads
5/16"	0.032"	1/8	Brass	1,200 psi @ 72° F	SAE J512, SAE J513, UL Listed	000000000	00000
5/16"	0.032"	1/4	Brass	1,200 psi @ 72° F	SAE J512, SAE J513, UL Listed	000000000	0000

Nuts

(A) Short Nut

(B) Short Nut

(A) Long Nut

For Use With: Air, Cutting Oil, Diesel Fuel, Fuel Oil, Mineral Oil, Refrigerant, Water; except nuts for 1" tube OD are not for use with fuel oil
Specifications Met: SAE J512, SAE J513, UL Listed; except nuts for 1" tube OD meet SAE J512 and SAE J513 only

	For Tube
	OD	Wall Thick.	Nut Material	Max. Pressure	Lg.		Each
Short Nuts
A	5/16"	0.049"	Brass	1,200 psi @ 72° F	7/8"	000000000	00000
B	5/16"	0.032"	Brass	1,200 psi @ 72° F	21/32"	000000000	00000
Long Nuts
A	5/16"	0.049"	Brass	1,200 psi @ 72° F	1 1/8"	000000000	0000

37° Flared Fittings for Copper Tubing

For Use With: Air, Fuel Oil, Mineral Oil, Water
Temperature Range: -40° to 400° F
Tubing: Use with seamless copper
Specifications Met: ISO 8434, MIL-F-18866, 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 can handle higher pressures than 45° flared fittings. Fittings are brass for good corrosion resistance. They 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

NPT Threads
For Tube OD	Pipe Size	Material	Max. Pressure		Each
5/16"	1/8	360 Brass	3,300 psi @ 72° F	000000000	00000

Nuts

For Tube OD	Nut Material		Each
5/16"	360 Brass	000000000	00000

Sleeves

For Tube OD	Sleeve Material		Each
5/16"	360 Brass	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 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
5/16"	1/8	Air, Hydraulic Fluid, Isopropyl Alcohol, Natural Gas, Phosphoric Acid, Water	316 Stainless Steel	6,000 psi @ 72° F	-420 to 1200°	000000000	000000
5/16"	1/4	Air, Hydraulic Fluid, Isopropyl Alcohol, Natural Gas, Phosphoric Acid, Water	316 Stainless Steel	6,000 psi @ 72° F	-420 to 1200°	000000000	00000

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
5/16"	316 Stainless Steel	000000000	00000

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.

Inch × metric sleeve adapters convert the fitting from inch to metric.

For Tube OD
Inch	Metric, mm	Sleeve Material		Each
Inch
5/16"	__	316 Stainless Steel	000000000	00000
Inch × Metric
5/16"	8	316 Stainless Steel	000000000	00000

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
5/16"	1/8	Air, Fuel Oil, Hydraulic Fluid, Mineral Oil	Zinc-Plated Steel	5,000 psi @ 72° F	-60° to 400°	000000000	00000

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
5/16"	Zinc-Plated Steel	4,000 psi @ 72° F	000000000	00000

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.

Inch × metric sleeve adapters convert the fitting from inch to metric.

For Tube OD
Inch	Metric, mm	Sleeve Material	Max. Pressure		Each
Inch Sleeves
5/16"	__	Zinc-Plated Steel	4,000 psi @ 72° F	000000000	00000
Inch × Metric Sleeve Adapters
5/16"	8	Zinc-Plated Steel	4,000 psi @ 72° F	000000000	0000