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.
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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.
For technical drawings and 3-D models, click on a part number.
Fittings with tube stem insert into the tube end of another fitting in place of a length of tubing.
Tube Stem OD | Pipe Size | Material | Max. Pressure | Each | |
NPT Threads | |||||
---|---|---|---|---|---|
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" | 3/8 | Brass | 800 psi @ 72° F | 00000000 | 00000 |
1/2" | 1/2 | Brass | 800 psi @ 72° F | 00000000 | 0000 |
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.
- 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.
Tube Stem OD | Pipe Size | Material | Max. Pressure | Temp. Range, °F | Each | |
NPT Threads | ||||||
---|---|---|---|---|---|---|
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.
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 |
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 |
Fittings with tube stem insert into the tube end of another fitting in place of a length of tubing.
Tube Stem OD | Pipe Size | Material | Max. Pressure | Temp. Range, °F | Specifications Met | Each | |
NPT Threads | |||||||
---|---|---|---|---|---|---|---|
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 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 |
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 |
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 |