Yor-Lok Nipples | McMaster-Carr

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85 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.

For Use With: Air, Cutting Oil, Diesel Fuel, Fuel Oil, Gasoline, Hydraulic Fluid, Mineral Oil, Water
Temperature Range: -40° to 400° F
Tubing: Use with seamless copper
Specifications Met: ASME B31.3

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. Fittings are brass for good corrosion resistance. They are compatible with Swagelok®, Let-Lok, and A-Lok fittings.

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

Straight Adapters, Tube Stem × Male Threaded Pipe

Fittings with tube stem insert into the tube end of another fitting in place of a length of tubing.

NPT Threads
Tube Stem OD	Pipe Size	Material	Max. Pressure		Each
1/4"	1/8	Brass	1,600 psi @ 72° F	00000000	00000
1/4"	1/4	Brass	1,600 psi @ 72° F	00000000	0000
3/8"	1/4	Brass	1,000 psi @ 72° F	00000000	0000
3/8"	3/8	Brass	1,000 psi @ 72° F	00000000	0000
1/2"	1/4	Brass	1,200 psi @ 72° F	00000000	00000
1/2"	3/8	Brass	800 psi @ 72° F	00000000	00000
1/2"	1/2	Brass	800 psi @ 72° F	00000000	0000
3/4"	3/4	Brass	1,000 psi @ 72° F	00000000	00000
1"	1	Brass	1,000 psi @ 72° F	00000000	00000

Straight Adapters, Tube Stem × Push-On Barbed Hose

Fittings with tube stem insert into the tube end of another fitting in place of a length of tubing.

Tube Stem OD	For Hose ID	Material	Max. Pressure		Each
1/4"	1/4"	Brass	350 psi @ 72° F	00000000	000000
3/8"	3/8"	Brass	350 psi @ 72° F	00000000	00000
1/2"	1/2"	Brass	350 psi @ 72° F	00000000	00000

Yor-Lok Fittings for Stainless Steel Tubing

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.

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

Straight Adapters, Tube Stem × Male Threaded Pipe

For Use With: Air, Cutting Oil, Fuel Oil, Gasoline, Hydraulic Fluid, Mineral Oil, Natural Gas, Steam, Water
Tubing: Use with welded or seamless 304/304L or 316/316L stainless steel that meets ASTM A213, ASTM A249, or ASTM A269

Fittings with tube stem insert into the tube end of another fitting in place of a length of tubing.

NPT Threads
Tube Stem OD	Pipe Size	Material	Max. Pressure	Temp. Range, °F		Each
1/16"	1/8	316 Stainless Steel	9,000 psi @ 72° F	-420° to 1200°	00000000	000000
1/8"	1/8	316 Stainless Steel	6,000 psi @ 72° F	-420° to 1200°	00000000	00000
1/8"	1/4	316 Stainless Steel	6,000 psi @ 72° F	-420° to 1200°	00000000	00000
1/4"	1/8	316 Stainless Steel	4,000 psi @ 72° F	-420° to 1200°	00000000	00000
1/4"	1/4	316 Stainless Steel	4,000 psi @ 72° F	-420° to 1200°	00000000	00000
1/4"	3/8	316 Stainless Steel	4,000 psi @ 72° F	-420° to 1200°	00000000	00000
1/4"	1/2	316 Stainless Steel	4,000 psi @ 72° F	-420° to 1200°	00000000	00000
3/8"	3/8	316 Stainless Steel	2,500 psi @ 72° F	-420° to 1200°	00000000	00000
3/8"	1/2	316 Stainless Steel	2,500 psi @ 72° F	-420° to 1200°	00000000	00000
1/2"	1/4	316 Stainless Steel	2,000 psi @ 72° F	-420° to 1200°	00000000	00000
1/2"	3/8	316 Stainless Steel	2,000 psi @ 72° F	-420° to 1200°	00000000	00000
1/2"	1/2	316 Stainless Steel	2,000 psi @ 72° F	-420° to 1200°	00000000	00000
3/4"	1/2	316 Stainless Steel	2,000 psi @ 72° F	-420° to 1200°	00000000	00000
3/4"	3/4	316 Stainless Steel	2,000 psi @ 72° F	-420° to 1200°	00000000	00000
1"	1	316 Stainless Steel	1,500 psi @ 72° F	-420° to 1200°	00000000	00000

Yor-Lok Fittings for Steel Tubing

For Use With: Air, Cutting Oil, Diesel Fuel, Fuel Oil, Gasoline, Hydraulic Fluid, Mineral Oil
Tubing: Use with seamless steel
Specifications Met: See table

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. Fittings are zinc-plated steel for fair corrosion resistance. They are compatible with Swagelok®, Let-Lok, and A-Lok fittings.

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

Straight Adapters, Tube × Male Threaded Pipe

BSPP Male Threads with Bonded Washer

For Tube
OD	Wall Thick.	Pipe Size	Material	Washer Material	Max. Pressure	Temp. Range, °F	Specifications Met		Each
NPT Threads
3mm	0.8mm	1/8	Zinc-Plated Steel	__	10,000 psi @ 72° F	-20° to 800°	ASME B31.3	00000000	00000
3mm	0.8mm	1/4	Zinc-Plated Steel	__	10,000 psi @ 72° F	-20° to 800°	ASME B31.3	00000000	0000
4mm	0.8mm	1/8	Zinc-Plated Steel	__	7,200 psi @ 72° F	-20° to 800°	ASME B31.3	00000000	0000
4mm	0.8mm	1/4	Zinc-Plated Steel	__	7,200 psi @ 72° F	-20° to 800°	ASME B31.3	00000000	0000
6mm	0.8mm	1/8	Zinc-Plated Steel	__	4,400 psi @ 72° F	-20° to 800°	ASME B31.3	00000000	0000
6mm	0.8mm	1/4	Zinc-Plated Steel	__	4,400 psi @ 72° F	-20° to 800°	ASME B31.3	00000000	0000
6mm	0.8mm	3/8	Zinc-Plated Steel	__	4,400 psi @ 72° F	-20° to 800°	ASME B31.3	00000000	0000
6mm	0.8mm	1/2	Zinc-Plated Steel	__	4,400 psi @ 72° F	-20° to 800°	ASME B31.3	00000000	0000
8mm	1mm	1/8	Zinc-Plated Steel	__	4,200 psi @ 72° F	-20° to 800°	ASME B31.3	00000000	0000
8mm	1mm	1/4	Zinc-Plated Steel	__	4,200 psi @ 72° F	-20° to 800°	ASME B31.3	00000000	0000
8mm	1mm	3/8	Zinc-Plated Steel	__	4,200 psi @ 72° F	-20° to 800°	ASME B31.3	00000000	0000
10mm	1mm	1/8	Zinc-Plated Steel	__	3,300 psi @ 72° F	-20° to 800°	ASME B31.3	00000000	0000
10mm	1mm	1/4	Zinc-Plated Steel	__	3,300 psi @ 72° F	-20° to 800°	ASME B31.3	00000000	0000
10mm	1mm	3/8	Zinc-Plated Steel	__	3,300 psi @ 72° F	-20° to 800°	ASME B31.3	00000000	0000
12mm	1mm	3/8	Zinc-Plated Steel	__	2,700 psi @ 72° F	-20° to 800°	ASME B31.3	00000000	0000
12mm	1mm	1/2	Zinc-Plated Steel	__	2,700 psi @ 72° F	-20° to 800°	ASME B31.3	00000000	0000
12mm	1mm	3/4	Zinc-Plated Steel	__	2,700 psi @ 72° F	-20° to 800°	ASME B31.3	00000000	00000
15mm	1.5mm	1/2	Zinc-Plated Steel	__	3,300 psi @ 72° F	-20° to 800°	ASME B31.3	00000000	0000
18mm	1.5mm	3/4	Zinc-Plated Steel	__	2,700 psi @ 72° F	-20° to 800°	ASME B31.3	00000000	00000
25mm	2.2mm	3/4	Zinc-Plated Steel	__	2,900 psi @ 72° F	-20° to 800°	ASME B31.3	00000000	00000
25mm	2.2mm	1	Zinc-Plated Steel	__	2,900 psi @ 72° F	-20° to 800°	ASME B31.3	00000000	00000
BSPP Threads
6mm	0.8mm	1/8	Zinc-Plated Steel	Buna-N Rubber, Steel	4,400 psi @ 72° F	-20° to 212°	ASME B31.3	00000000	0000
6mm	0.8mm	1/4	Zinc-Plated Steel	Buna-N Rubber, Steel	4,400 psi @ 72° F	-20° to 212°	ASME B31.3	00000000	0000
BSPT Threads
6mm	0.8mm	1/8	Zinc-Plated Steel	__	4,400 psi @ 72° F	-20° to 800°	ASME B31.3	00000000	0000
6mm	0.8mm	1/4	Zinc-Plated Steel	__	4,400 psi @ 72° F	-20° to 800°	ASME B31.3	00000000	0000
8mm	1mm	1/8	Zinc-Plated Steel	__	4,200 psi @ 72° F	-20° to 800°	ASME B31.3	00000000	0000
8mm	1mm	1/4	Zinc-Plated Steel	__	4,200 psi @ 72° F	-20° to 800°	ASME B31.3	00000000	0000

Straight Adapters, Tube × Female Threaded Pipe

For Tube
OD	Wall Thick.	Pipe Size	Material	Max. Pressure	Temp. Range, °F	Specifications Met		Each
NPT Threads
4mm	0.8mm	1/8	Zinc-Plated Steel	7,200 psi @ 72° F	-20° to 800°	ASME B31.3	00000000	00000
6mm	0.8mm	1/4	Zinc-Plated Steel	4,400 psi @ 72° F	-20° to 800°	ASME B31.3	00000000	0000
8mm	1mm	1/4	Zinc-Plated Steel	4,200 psi @ 72° F	-20° to 800°	ASME B31.3	00000000	0000
10mm	1mm	1/4	Zinc-Plated Steel	3,300 psi @ 72° F	-20° to 800°	ASME B31.3	00000000	0000
10mm	1mm	3/8	Zinc-Plated Steel	3,300 psi @ 72° F	-20° to 800°	ASME B31.3	00000000	0000
10mm	1mm	1/2	Zinc-Plated Steel	3,300 psi @ 72° F	-20° to 800°	ASME B31.3	00000000	0000
BSPP Threads
12mm	1mm	1/2	Zinc-Plated Steel	2,700 psi @ 72° F	-20° to 800°	ASME B31.3	00000000	00000

Straight Adapters, Tube Stem × Male Threaded Pipe

Fittings with tube stem insert into the tube end of another fitting in place of a length of tubing.

NPT Threads
Tube Stem OD	Pipe Size	Material	Max. Pressure	Temp. Range, °F	Specifications Met		Each
1/4"	1/8	Zinc-Plated Steel	4,900 psi @ 72° F	-20° to 395°	ASME B1.20.1, ASME B31.1, ASME B31.3, ASTM A108	00000000	00000
1/4"	1/4	Zinc-Plated Steel	4,900 psi @ 72° F	-20° to 395°	ASME B1.20.1, ASME B31.1, ASME B31.3, ASTM A108	00000000	0000
3/8"	1/4	Zinc-Plated Steel	3,100 psi @ 72° F	-20° to 395°	ASME B1.20.1, ASME B31.1, ASME B31.3, ASTM A108	00000000	00000
3/8"	3/8	Zinc-Plated Steel	3,100 psi @ 72° F	-20° to 395°	ASME B1.20.1, ASME B31.1, ASME B31.3, ASTM A108	00000000	00000
1/2"	3/8	Zinc-Plated Steel	2,300 psi @ 72° F	-20° to 395°	ASME B1.20.1, ASME B31.1, ASME B31.3, ASTM A108	00000000	00000
1/2"	1/2	Zinc-Plated Steel	2,300 psi @ 72° F	-20° to 395°	ASME B1.20.1, ASME B31.1, ASME B31.3, ASTM A108	00000000	00000

Through-Wall Straight Adapters, Tube × Female Threaded Pipe

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, mm	Wall Thick., mm	Pipe Size	Material	Max. Pressure	Temp. Range, °F	For Hole Dia., mm	For Max. Wall Thick., mm	Specifications Met		Each
NPT Threads
6	0.8	1/8	Zinc-Plated Steel	4,400 psi @ 72° F	-20° to 800°	11.5	10.2	ASME B31.3	00000000	00000
6	0.8	1/4	Zinc-Plated Steel	4,400 psi @ 72° F	-20° to 800°	11.5	10.2	ASME B31.3	00000000	0000

Nuts

For Tube
OD	Wall Thick.	Nut Material	Max. Pressure	Temp. Range, °F	Specifications Met		Each
3mm	0.8mm	Zinc-Plated Steel	10,000 psi @ 72° F	-20° to 800°	ASME B31.3	00000000	00000
4mm	0.8mm	Zinc-Plated Steel	7,200 psi @ 72° F	-20° to 800°	ASME B31.3	00000000	0000
6mm	0.8mm	Zinc-Plated Steel	4,400 psi @ 72° F	-20° to 800°	ASME B31.3	00000000	0000
8mm	1mm	Zinc-Plated Steel	4,200 psi @ 72° F	-20° to 800°	ASME B31.3	00000000	0000
10mm	1mm	Zinc-Plated Steel	3,300 psi @ 72° F	-20° to 800°	ASME B31.3	00000000	0000
12mm	1mm	Zinc-Plated Steel	2,700 psi @ 72° F	-20° to 800°	ASME B31.3	00000000	0000
18mm	1.5mm	Zinc-Plated Steel	2,700 psi @ 72° F	-20° to 800°	ASME B31.3	00000000	0000
25mm	2.2mm	Zinc-Plated Steel	2,900 psi @ 72° F	-20° to 800°	ASME B31.3	00000000	0000

Front and Back Sleeves

For Tube
OD	Wall Thick.	Front Sleeve Material	Back Sleeve Material	Max. Pressure	Temp. Range, °F	Specifications Met		Each
3mm	0.8mm	Zinc-Plated Steel	316 Stainless Steel	10,000 psi @ 72° F	-20° to 800°	ASME B31.3	00000000	00000
4mm	0.8mm	Zinc-Plated Steel	316 Stainless Steel	7,200 psi @ 72° F	-20° to 800°	ASME B31.3	00000000	0000
6mm	0.8mm	Zinc-Plated Steel	316 Stainless Steel	4,400 psi @ 72° F	-20° to 800°	ASME B31.3	00000000	0000
8mm	1mm	Zinc-Plated Steel	316 Stainless Steel	4,200 psi @ 72° F	-20° to 800°	ASME B31.3	00000000	0000
10mm	1mm	Zinc-Plated Steel	316 Stainless Steel	3,300 psi @ 72° F	-20° to 800°	ASME B31.3	00000000	0000
12mm	1mm	Zinc-Plated Steel	316 Stainless Steel	2,700 psi @ 72° F	-20° to 800°	ASME B31.3	00000000	0000
15mm	1.5mm	Zinc-Plated Steel	316 Stainless Steel	3,300 psi @ 72° F	-20° to 800°	ASME B31.3	00000000	0000
18mm	1.5mm	Zinc-Plated Steel	316 Stainless Steel	2,700 psi @ 72° F	-20° to 800°	ASME B31.3	00000000	0000

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How to Identify and Measure Fittings

Yor-Lok Fittings for Copper Tubing

Yor-Lok Fittings for Stainless Steel Tubing

Yor-Lok Fittings for Steel Tubing