How to Identify and Measure Fittings
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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:
Inch:
NPT and BSPT Threads: Air, Cutting Oil, Fuel Oil, Gasoline, Hydraulic Fluid, Mineral Oil, Natural Gas, Steam, Water
BSPP Threads: Air, Cutting Oil, Fuel Oil, Gasoline, Mineral Oil, Water
UN/UNF (SAE Straight) Threads: Air, Cutting Oil, Fuel Oil, Gasoline, Hydraulic Fluid, Mineral Oil
Metric:
NPT, BSPT, and UN/UNF (SAE Straight) Threads: Air, Cutting Oil, Fuel Oil, Gasoline, Hydraulic Fluid, Mineral Oil, Natural Gas, Steam, Water - Tubing:
Inch:
NPT and UN/UNF (SAE Straight) Threads: Use with welded or seamless 304/304L or 316/316L stainless steel that meets ASTM A213, ASTM A249, or ASTM A269
BSPP and BSPT Threads: Use with seamless 304 or 316 stainless steel that meets ASTM A269
Metric:
NPT and BSPT Threads: Use with welded or seamless 304/304L or 316/316L stainless steel that meets ASTM A213, ASTM A249, or ASTM A269
UN/UNF (SAE Straight) Threads: Use with welded or seamless 304/304L or 316/316L stainless steel that meets ASTM A213, ASTM A249, or ASTM A269
For Tube | |||||||
|---|---|---|---|---|---|---|---|
| OD | Wall Thick. | Pipe Size  | Material | Max. Pressure | Temp. Range, °F | Each | |
NPT Threads | |||||||
| 1/16" | 0.02" | 1/16 | 316 Stainless Steel | 9,000 psi @ 72° F | -420° to 1200° | 00000000 | 000000 |
| 1/16" | 0.02" | 1/8 | 316 Stainless Steel | 9,000 psi @ 72° F | -420° to 1200° | 00000000 | 00000 |
| 1/16" | 0.01" to 0.028" | 1/4 | 316 Stainless Steel | 7,500 psi @ 72° F | -420° to 1200° | 00000000 | 00000 |
- For Use With: Air, Cutting Oil, Fuel Oil, Gasoline, Hydraulic Fluid, Mineral Oil, Natural Gas, Steam, Water
- Tubing:
Inch:
NPT Threads: Use with welded or seamless 304/304L or 316/316L stainless steel that meets ASTM A213, ASTM A249, or ASTM A269
BSPP and BSPT Threads: Use with seamless 304 or 316 stainless steel that meets ASTM A269
Metric:
NPT Threads: Use with welded or seamless 304/304L or 316/316L stainless steel that meets ASTM A213, ASTM A249, or ASTM A269
- 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
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 | Wall Thick. | Pipe Size | Material | Max. Pressure | Temp. Range, °F | For Hole Dia. | For Max. Wall Thick. | Each | |
NPT Threads | |||||||||
| 1/16" | 0.01" to 0.028" | 1/16 | 316 Stainless Steel | 9,000 psi @ 72° F | -420° to 1200° | 3/16" | 1/8" | 00000000 | 000000 |
| 1/16" | 0.01" to 0.028" | 1/8 | 316 Stainless Steel | 9,000 psi @ 72° F | -420° to 1200° | 3/16" | 1/8" | 00000000 | 00000 |
- 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
For Tube (Metric) | For Tube (Inch) | |||||||
|---|---|---|---|---|---|---|---|---|
| OD, mm | Wall Thick., mm | OD | Wall Thick. | Material | Max. Pressure | Temp. Range, °F | Each | |
| 6 | 1 to 1.5 | 1/16" | 0.01" to 0.02" | 316 Stainless Steel | 6,000 psi @ 72° F | -420° to 1200° | 0000000 | 000000 |
- 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.
- 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
For Tube | ||||||
|---|---|---|---|---|---|---|
| OD | Wall Thick. | Material | Max. Pressure | Temp. Range, °F | Each | |
| 1/16" | 0.02" | 316 Stainless Steel | 9,000 psi @ 72° F | -420° to 1200° | 00000000 | 000000 |
- 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
For Tube | |||||||
|---|---|---|---|---|---|---|---|
| OD | Wall Thick. | Bore Dia. | Material | Max. Pressure | Temp. Range, °F | Each | |
| 1/16" | 0.02" | 0.013" | 316 Stainless Steel | 9,000 psi @ 72° F | -420° to 1200° | 00000000 | 000000 |
- 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
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 | Wall Thick. | Material | Max. Pressure | Temp. Range, °F | For Hole Dia. | For Max. Wall Thick. | Each | |
| 1/16" | 0.02" | 316 Stainless Steel | 9,000 psi @ 72° F | -420° to 1200° | 3/16" | 1/8" | 00000000 | 000000 |
- 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
For Tube (A) | For Tube (B) | |||||||
|---|---|---|---|---|---|---|---|---|
| OD | Wall Thick. | OD | Wall Thick. | Material | Max. Pressure | Temp. Range, °F | Each | |
| 1/8" | 0.035" | 1/16" | 0.035" | 316 Stainless Steel | 6,000 psi @ 72° F | -420° to 1200° | 00000000 | 000000 |
| 3/16" | 0.035" | 1/16" | 0.035" | 316 Stainless Steel | 5,500 psi @ 72° F | -420° to 1200° | 00000000 | 00000 |
| 1/4" | 0.035" | 1/16" | 0.035" | 316 Stainless Steel | 4,000 psi @ 72° F | -420° to 1200° | 00000000 | 00000 |
| 3/8" | 0.035" | 1/16" | 0.035" | 316 Stainless Steel | 2,500 psi @ 72° F | -420° to 1200° | 00000000 | 00000 |
- For Use With:
NPT and BSPT Threads: Air, Cutting Oil, Fuel Oil, Gasoline, Hydraulic Fluid, Mineral Oil, Natural Gas, Steam, Water
BSPP Threads: Air, Cutting Oil, Fuel Oil, Gasoline, Mineral Oil, Water
UN/UNF (SAE Straight) Threads: Air, Cutting Oil, Fuel Oil, Gasoline, Hydraulic Fluid, Mineral Oil - Tubing:
NPT and UN/UNF (SAE Straight) Threads: Use with welded or seamless 304/304L or 316/316L stainless steel that meets ASTM A213, ASTM A249, or ASTM A269
BSPP and BSPT Threads: Use with seamless 304 or 316 stainless steel that meets ASTM A269
- 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
For Tube | ||||||
|---|---|---|---|---|---|---|
| OD | Wall Thick. | Material | Max. Pressure | Temp. Range, °F | Each | |
| 1/16" | 0.02" | 316 Stainless Steel | 9,000 psi @ 72° F | -420° to 1200° | 00000000 | 000000 |
- 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
For Tube | ||||||
|---|---|---|---|---|---|---|
| OD | Wall Thick. | Material | Max. Pressure | Temp. Range, °F | Each | |
| 1/16" | 0.02" | 316 Stainless Steel | 9,000 psi @ 72° F | -420° to 1200° | 00000000 | 000000 |
- 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
For Tube | ||||||
|---|---|---|---|---|---|---|
| OD | Wall Thick. | Material | Max. Pressure | Temp. Range, °F | Each | |
| 1/16" | 0.02" | 316 Stainless Steel | 9,000 psi @ 72° F | -420° to 1200° | 00000000 | 0000000 |
For Tube | ||||||
|---|---|---|---|---|---|---|
| OD | Wall Thick. | Nut Material | Max. Pressure | Temp. Range, °F | Each | |
| 1/16" | 0.02" | 316 Stainless Steel | 9,000 psi @ 72° F | -420° to 1200° | 00000000 | 00000 |
| 1/8" | 0.035" | 316 Stainless Steel | 6,000 psi @ 72° F | -420° to 1200° | 00000000 | 0000 |
| 3/16" | 0.035" | 316 Stainless Steel | 5,500 psi @ 72° F | -420° to 1200° | 00000000 | 0000 |
| 1/4" | 0.035" | 316 Stainless Steel | 4,000 psi @ 72° F | -420° to 1200° | 00000000 | 0000 |
| 3/8" | 0.035" | 316 Stainless Steel | 2,500 psi @ 72° F | -420° to 1200° | 00000000 | 0000 |
| 6mm | 1mm | 316 Stainless Steel | 4,000 psi @ 72° F | -420° to 1200° | 00000000 | 0000 |
For Tube | ||||||
|---|---|---|---|---|---|---|
| OD | Wall Thick. | Sleeve Material | Max. Pressure | Temp. Range, °F | Each | |
| 1/16" | 0.02" | 316 Stainless Steel | 9,000 psi @ 72° F | -420° to 1200° | 00000000 | 00000 |
| 1/8" | 0.035" | 316 Stainless Steel | 6,000 psi @ 72° F | -420° to 1200° | 00000000 | 0000 |
| 3/16" | 0.035" | 316 Stainless Steel | 5,500 psi @ 72° F | -420° to 1200° | 00000000 | 0000 |
| 1/4" | 0.035" | 316 Stainless Steel | 4,000 psi @ 72° F | -420° to 1200° | 00000000 | 0000 |
| 3/8" | 0.035" | 316 Stainless Steel | 2,500 psi @ 72° F | -420° to 1200° | 00000000 | 0000 |
| 6mm | 1mm | 316 Stainless Steel | 4,000 psi @ 72° F | -420° to 1200° | 00000000 | 0000 |
PTFE sleeves are plastic instead of stainless steel, so they won’t damage tubing.
| For Tube OD | Sleeve Material | Max. Pressure | Temp. Range, °F | Each | |
| 1/16" | PTFE Plastic | Not Rated | -65° to 350° | 00000000 | 000000 |
| 1/8" | PTFE Plastic | Not Rated | -65° to 350° | 00000000 | 0000 |
| 3/16" | PTFE Plastic | Not Rated | -65° to 350° | 00000000 | 00000 |
| 1/4" | PTFE Plastic | Not Rated | -65° to 350° | 00000000 | 0000 |
| 3/8" | PTFE Plastic | Not Rated | -65° to 350° | 00000000 | 0000 |
Tube supports are recommended for soft plastic tubing to prevent the tube from collapsing.
Compression Fittings for Stainless Steel Tubing
A single sleeve (ferrule) bites into tubing as you tighten the nut, creating a strong seal. The nut and sleeve are included. Fittings are also known as flareless fittings or bite fittings. Use them in low- to medium-pressure applications.
303 stainless steel fittings and 360 brass fittings have good corrosion resistance. Metric and UN/UNF (SAE Straight) male threads have a gasket to protect against leaks. UN/UNF (SAE Straight) threads are also known as O-ring boss threads.
For technical drawings and 3-D models, click on a part number.
(SAE Straight) Male
Threads with Gasket
- For Use With:
303 Stainless Steel, 316 Stainless Steel with 17-4 PH Stainless Steel Sleeve, and 360 Brass: Air, Water, Hydraulic Fluid
316 Stainless Steel: Air, Cutting Oil, Ethyl Alcohol, Fuel Oil, Gasoline, Hydraulic Fluid, Isopropyl Alcohol, Mineral Oil, Natural Gas, Steam, Water - Temperature Range: See table
- Tubing: See table
- Specifications Met:
316 Stainless Steel: ISO 8434, DIN 2353
316 Stainless Steel with 17-4 PH Stainless Steel Sleeve: SAE J514
For Tube | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| OD | Wall Thick. | Thread Size | Material | Gasket Material | Sleeve Material | Max. Pressure | Temp. Range, °F | For Tube Material | For Tube Fabrication | Each | |
Metric Threads | |||||||||||
| 1/16" | 0.01" | M3 × 0.5 mm | 303 Stainless Steel | Fluoroelastomer Rubber | 303 Stainless Steel | 2,000 psi @ 72° F | -4° to 400° | 304 Stainless Steel, 316 Stainless Steel | Seamless, Welded | 0000000 | 000000 |
| 1/16" | 0.01" | M5 × 0.8 mm | 303 Stainless Steel | Fluoroelastomer Rubber | 303 Stainless Steel | 2,000 psi @ 72° F | -4° to 400° | 304 Stainless Steel, 316 Stainless Steel | Seamless, Welded | 0000000 | 00000 |
UN/UNF (SAE Straight) Threads | |||||||||||
| 1/16" | 0.01" | 10-32 | 303 Stainless Steel | Fluoroelastomer Rubber | 303 Stainless Steel | 2,000 psi @ 72° F | -4° to 400° | 304 Stainless Steel, 316 Stainless Steel | Seamless, Welded | 0000000 | 00000 |
| 1/16" | 0.01" | 10-32 | Nickel-Plated 360 Brass | Buna-N Rubber | 360 Brass | 2,000 psi @ 72° F | -40° to 250° | 304 Stainless Steel, 316 Stainless Steel | Seamless, Welded | 0000000 | 00000 |
Precision Compression Fittings for Stainless Steel Tubing
- For Use With: Air, Cutting Oil, Ethyl Alcohol, Fuel Oil, Gasoline, Hydraulic Fluid, Isopropyl Alcohol, Mineral Oil, Natural Gas, Steam, Water
- Temperature Range: -420° to 1200° F
- Tubing: Use with welded or seamless 304 or 316 stainless steel that meets ASTM A213, ASTM A249, or ASTM A269
- Compatible With: Parker CPI
Made to tighter tolerances than other compression fittings, these are designed for high-precision applications. Also known as instrumentation fittings and flareless fittings. They come with a nut and a single sleeve (ferrule). The sleeve bites into tubing as you tighten the nut to create a strong seal. Fittings are 316 stainless steel for excellent corrosion resistance. A molybdenum disulfide coating on the nut acts as a lubricant for easy installation.
For technical drawings and 3-D models, click on a part number.
For Tube | ||||||
|---|---|---|---|---|---|---|
| OD | Wall Thick. | Pipe Size | Material | Max. Pressure | Each | |
| 1/16" | 0.02" | 1/16 | 316 Stainless Steel | 7,500 psi @ 72° F | 0000000 | 000000 |
For Tube | ||||||
|---|---|---|---|---|---|---|
| OD | Wall Thick. | Pipe Size | Material | Max. Pressure | Each | |
| 1/16" | 0.02" | 1/16 | 316 Stainless Steel | 7,500 psi @ 72° F | 00000000 | 000000 |
For Tube | |||||
|---|---|---|---|---|---|
| OD | Wall Thick. | Material | Max. Pressure | Each | |
| 1/16" | 0.02" | 316 Stainless Steel | 7,500 psi @ 72° F | 0000000 | 000000 |
For Tube | ||||||
|---|---|---|---|---|---|---|
| OD | Wall Thick. | Pipe Size | Material | Max. Pressure | Each | |
| 1/16" | 0.02" | 1/16 | 316 Stainless Steel | 7,500 psi @ 72° F | 0000000 | 000000 |
For Tube | |||||
|---|---|---|---|---|---|
| OD | Wall Thick. | Material | Max. Pressure | Each | |
| 1/16" | 0.02" | 316 Stainless Steel | 7,500 psi @ 72° F | 0000000 | 000000 |
For Tube | |||||
|---|---|---|---|---|---|
| OD | Wall Thick. | Material | Max. Pressure | Each | |
| 1/16" | 0.02" | 316 Stainless Steel | 7,500 psi @ 72° F | 0000000 | 000000 |
For Tube | ||||
|---|---|---|---|---|
| OD | Wall Thick. | Nut Material | Max. Pressure | |
| 1/16" | 0.02" | Molybdenum-Disulfide-Coated 316 Stainless Steel | 7,500 psi @ 72° F | 00000000 |
For Tube | ||||
|---|---|---|---|---|
| OD | Wall Thick. | Sleeve Material | Max. Pressure | |
| 1/16" | 0.02" | 316 Stainless Steel | 7,500 psi @ 72° F | 00000000 |
Quick-Turn Couplings for Stainless Steel Tubing
- For Use With: Air
- Temperature Range: 32° to 350° F
- Tubing: Use with 304/304L or 316/316L stainless steel
Also known as luer lock couplings, these consist of a plug and socket that connect to small-diameter tubing with a half turn. They have a compact body for easy installation in tight spaces. Insert tubing into the plug or socket and tighten the nut to form a seal. Couplings are open-flow style, so there is no shut-off valve to stop the flow when the coupling is separated. They are 316 stainless steel for excellent corrosion resistance.
Note: For a complete coupling, order a plug and a socket.
For technical drawings and 3-D models, click on a part number.
Precision Compression Fittings for Copper Tubing
- For Use With: Air, Cutting Oil, Ethyl Alcohol, Fuel Oil, Gasoline, Hydraulic Fluid, Isopropyl Alcohol, Mineral Oil, Natural Gas, Steam, Water
- Temperature Range: -40° to 350° F
- Tubing: Use with seamless copper that meets ASTM B68, ASTM B75, or ASTM B88
- Compatible With: Parker CPI
Made to tighter tolerances than other compression fittings, these are designed for high-precision applications. They are also known as instrumentation fittings and flareless fittings. They come with a nut and a single sleeve (ferrule). The sleeve bites into tubing as you tighten the nut to create a strong seal. The nut has a molybdenum disulfide coating that acts as a lubricant for easy installation. Fittings are brass for good corrosion resistance.
For technical drawings and 3-D models, click on a part number.
For Tube | ||||||
|---|---|---|---|---|---|---|
| OD | Wall Thick. | Pipe Size | Material | Max. Pressure | Each | |
NPT Threads | ||||||
| 1/16" | 0.014" | 1/16 | Brass | 2,600 psi @ 72° F | 0000000 | 000000 |
For Tube | ||||||
|---|---|---|---|---|---|---|
| OD | Wall Thick. | Pipe Size | Material | Max. Pressure | Each | |
NPT Threads | ||||||
| 1/16" | 0.02" | 1/16 | Brass | 3,800 psi @ 72° F | 00000000 | 00000 |
For Tube | |||||
|---|---|---|---|---|---|
| OD | Wall Thick. | Material | Max. Pressure | Each | |
| 1/16" | 0.02" | Brass | 3,800 psi @ 72° F | 00000000 | 000000 |
For Tube | |||||
|---|---|---|---|---|---|
| OD | Wall Thick. | Nut Material | Max. Pressure | Each | |
| 1/16" | 0.02" | Brass | 3,800 psi @ 72° F | 00000000 | 00000 |
For Tube | |||||
|---|---|---|---|---|---|
| OD | Wall Thick. | Sleeve Material | Max. Pressure | Each | |
| 1/16" | 0.02" | Brass | 3,800 psi @ 72° F | 00000000 | 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.
For technical drawings and 3-D models, click on a part number.
For Tube | |||||
|---|---|---|---|---|---|
| OD | Wall Thick. | Material | Max. Pressure | Each | |
| 1/16" | 0.028" | Brass | 5,400 psi @ 72° F | 00000000 | 000000 |
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 | Wall Thick. | Material | Max. Pressure | Each | |
| 1/16" | 0.028" | Brass | 5,400 psi @ 72° F | 00000000 | 000000 |
For Tube | |||||
|---|---|---|---|---|---|
| OD | Wall Thick. | Material | Max. Pressure | Each | |
| 1/16" | 0.028" | Brass | 5,400 psi @ 72° F | 00000000 | 000000 |
