Yor-Lok Nipples | McMaster-Carr

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85 Products

About Pipe and Fittings

Measure your pipe and fittings to identify their pipe size, thread size, schedule, and thread type. Then, find compatible components.

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.

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°	5182K139	000000
1/8"	1/8	316 Stainless Steel	6,000 psi @ 72° F	-420° to 1200°	5182K141	00000
1/8"	1/4	316 Stainless Steel	6,000 psi @ 72° F	-420° to 1200°	5182K145	00000
1/4"	1/8	316 Stainless Steel	4,000 psi @ 72° F	-420° to 1200°	5182K146	00000
1/4"	1/4	316 Stainless Steel	4,000 psi @ 72° F	-420° to 1200°	5182K147	00000
1/4"	3/8	316 Stainless Steel	4,000 psi @ 72° F	-420° to 1200°	5182K148	00000
1/4"	1/2	316 Stainless Steel	4,000 psi @ 72° F	-420° to 1200°	5182K149	00000
3/8"	3/8	316 Stainless Steel	2,500 psi @ 72° F	-420° to 1200°	5182K153	00000
3/8"	1/2	316 Stainless Steel	2,500 psi @ 72° F	-420° to 1200°	5182K154	00000
1/2"	1/4	316 Stainless Steel	2,000 psi @ 72° F	-420° to 1200°	5182K155	00000
1/2"	3/8	316 Stainless Steel	2,000 psi @ 72° F	-420° to 1200°	5182K161	00000
1/2"	1/2	316 Stainless Steel	2,000 psi @ 72° F	-420° to 1200°	5182K162	00000
3/4"	1/2	316 Stainless Steel	2,000 psi @ 72° F	-420° to 1200°	5182K163	00000
3/4"	3/4	316 Stainless Steel	2,000 psi @ 72° F	-420° to 1200°	5182K165	00000
1"	1	316 Stainless Steel	1,500 psi @ 72° F	-420° to 1200°	5182K171	00000

Yor-Lok Fittings for Copper Tubing

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.

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	5272K721	00000
1/4"	1/4	Brass	1,600 psi @ 72° F	5272K722	0000
3/8"	1/4	Brass	1,000 psi @ 72° F	5272K723	0000
3/8"	3/8	Brass	1,000 psi @ 72° F	5272K724	0000
1/2"	1/4	Brass	1,200 psi @ 72° F	5272K426	00000
1/2"	3/8	Brass	800 psi @ 72° F	5272K725	00000
1/2"	1/2	Brass	800 psi @ 72° F	5272K726	00000
3/4"	3/4	Brass	1,000 psi @ 72° F	5272K427	00000
1"	1	Brass	1,000 psi @ 72° F	5272K428	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	5272K462	000000
3/8"	3/8"	Brass	350 psi @ 72° F	5272K463	00000
1/2"	1/2"	Brass	350 psi @ 72° F	5272K464	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.

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	4292N137	00000
3mm	0.8mm	1/4	Zinc-Plated Steel	__	10,000 psi @ 72° F	-20° to 800°	ASME B31.3	4292N138	0000
4mm	0.8mm	1/8	Zinc-Plated Steel	__	7,200 psi @ 72° F	-20° to 800°	ASME B31.3	4292N139	0000
4mm	0.8mm	1/4	Zinc-Plated Steel	__	7,200 psi @ 72° F	-20° to 800°	ASME B31.3	4292N141	0000
6mm	0.8mm	1/8	Zinc-Plated Steel	__	4,400 psi @ 72° F	-20° to 800°	ASME B31.3	4292N142	0000
6mm	0.8mm	1/4	Zinc-Plated Steel	__	4,400 psi @ 72° F	-20° to 800°	ASME B31.3	4292N143	0000
6mm	0.8mm	3/8	Zinc-Plated Steel	__	4,400 psi @ 72° F	-20° to 800°	ASME B31.3	4292N144	0000
6mm	0.8mm	1/2	Zinc-Plated Steel	__	4,400 psi @ 72° F	-20° to 800°	ASME B31.3	4292N145	0000
8mm	1mm	1/8	Zinc-Plated Steel	__	4,200 psi @ 72° F	-20° to 800°	ASME B31.3	4292N146	0000
8mm	1mm	1/4	Zinc-Plated Steel	__	4,200 psi @ 72° F	-20° to 800°	ASME B31.3	4292N147	0000
8mm	1mm	3/8	Zinc-Plated Steel	__	4,200 psi @ 72° F	-20° to 800°	ASME B31.3	4292N148	0000
10mm	1mm	1/8	Zinc-Plated Steel	__	3,300 psi @ 72° F	-20° to 800°	ASME B31.3	4292N151	0000
10mm	1mm	1/4	Zinc-Plated Steel	__	3,300 psi @ 72° F	-20° to 800°	ASME B31.3	4292N152	0000
10mm	1mm	3/8	Zinc-Plated Steel	__	3,300 psi @ 72° F	-20° to 800°	ASME B31.3	4292N153	0000
12mm	1mm	3/8	Zinc-Plated Steel	__	2,700 psi @ 72° F	-20° to 800°	ASME B31.3	4292N157	0000
12mm	1mm	1/2	Zinc-Plated Steel	__	2,700 psi @ 72° F	-20° to 800°	ASME B31.3	4292N158	0000
12mm	1mm	3/4	Zinc-Plated Steel	__	2,700 psi @ 72° F	-20° to 800°	ASME B31.3	4292N159	00000
15mm	1.5mm	1/2	Zinc-Plated Steel	__	3,300 psi @ 72° F	-20° to 800°	ASME B31.3	4292N163	00000
18mm	1.5mm	3/4	Zinc-Plated Steel	__	2,700 psi @ 72° F	-20° to 800°	ASME B31.3	4292N167	00000
25mm	2.2mm	3/4	Zinc-Plated Steel	__	2,900 psi @ 72° F	-20° to 800°	ASME B31.3	4292N173	00000
25mm	2.2mm	1	Zinc-Plated Steel	__	2,900 psi @ 72° F	-20° to 800°	ASME B31.3	4292N174	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	4292N214	0000
6mm	0.8mm	1/4	Zinc-Plated Steel	Buna-N Rubber, Steel	4,400 psi @ 72° F	-20° to 212°	ASME B31.3	4292N215	00000
BSPT Threads
6mm	0.8mm	1/8	Zinc-Plated Steel	__	4,400 psi @ 72° F	-20° to 800°	ASME B31.3	4292N179	0000
6mm	0.8mm	1/4	Zinc-Plated Steel	__	4,400 psi @ 72° F	-20° to 800°	ASME B31.3	4292N181	0000
8mm	1mm	1/8	Zinc-Plated Steel	__	4,200 psi @ 72° F	-20° to 800°	ASME B31.3	4292N184	0000
8mm	1mm	1/4	Zinc-Plated Steel	__	4,200 psi @ 72° F	-20° to 800°	ASME B31.3	4292N185	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	4292N271	00000
6mm	0.8mm	1/4	Zinc-Plated Steel	4,400 psi @ 72° F	-20° to 800°	ASME B31.3	4292N273	0000
8mm	1mm	1/4	Zinc-Plated Steel	4,200 psi @ 72° F	-20° to 800°	ASME B31.3	4292N277	0000
10mm	1mm	1/4	Zinc-Plated Steel	3,300 psi @ 72° F	-20° to 800°	ASME B31.3	4292N279	0000
10mm	1mm	3/8	Zinc-Plated Steel	3,300 psi @ 72° F	-20° to 800°	ASME B31.3	4292N281	0000
10mm	1mm	1/2	Zinc-Plated Steel	3,300 psi @ 72° F	-20° to 800°	ASME B31.3	4292N282	00000
BSPP Threads
12mm	1mm	1/2	Zinc-Plated Steel	2,700 psi @ 72° F	-20° to 800°	ASME B31.3	4292N313	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	5929K621	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	5929K622	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	5929K623	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	5929K624	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	5929K625	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	5929K626	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	4292N294	000000
6	0.8	1/4	Zinc-Plated Steel	4,400 psi @ 72° F	-20° to 800°	11.5	10.2	ASME B31.3	4292N295	00000

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	4292N125	00000
4mm	0.8mm	Zinc-Plated Steel	7,200 psi @ 72° F	-20° to 800°	ASME B31.3	4292N126	0000
6mm	0.8mm	Zinc-Plated Steel	4,400 psi @ 72° F	-20° to 800°	ASME B31.3	4292N127	0000
8mm	1mm	Zinc-Plated Steel	4,200 psi @ 72° F	-20° to 800°	ASME B31.3	4292N128	0000
10mm	1mm	Zinc-Plated Steel	3,300 psi @ 72° F	-20° to 800°	ASME B31.3	4292N129	0000
12mm	1mm	Zinc-Plated Steel	2,700 psi @ 72° F	-20° to 800°	ASME B31.3	4292N131	0000
18mm	1.5mm	Zinc-Plated Steel	2,700 psi @ 72° F	-20° to 800°	ASME B31.3	4292N133	0000
25mm	2.2mm	Zinc-Plated Steel	2,900 psi @ 72° F	-20° to 800°	ASME B31.3	4292N136	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	4292N112	00000
4mm	0.8mm	Zinc-Plated Steel	316 Stainless Steel	7,200 psi @ 72° F	-20° to 800°	ASME B31.3	4292N113	0000
6mm	0.8mm	Zinc-Plated Steel	316 Stainless Steel	4,400 psi @ 72° F	-20° to 800°	ASME B31.3	4292N114	0000
8mm	1mm	Zinc-Plated Steel	316 Stainless Steel	4,200 psi @ 72° F	-20° to 800°	ASME B31.3	4292N115	0000
10mm	1mm	Zinc-Plated Steel	316 Stainless Steel	3,300 psi @ 72° F	-20° to 800°	ASME B31.3	4292N116	0000
12mm	1mm	Zinc-Plated Steel	316 Stainless Steel	2,700 psi @ 72° F	-20° to 800°	ASME B31.3	4292N117	0000
15mm	1.5mm	Zinc-Plated Steel	316 Stainless Steel	3,300 psi @ 72° F	-20° to 800°	ASME B31.3	4292N118	0000
18mm	1.5mm	Zinc-Plated Steel	316 Stainless Steel	2,700 psi @ 72° F	-20° to 800°	ASME B31.3	4292N121	0000