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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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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.

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 | For Hole Dia. | For Max. Wall Thick. | Each | |
1/8" | 0.035" | Brass | 2,700 psi @ 72° F | 5/16" | 1/2" | 00000000 | 000000 |
1/4" | 0.035" | Brass | 1,200 psi @ 72° F | 7/16" | 17/32" | 00000000 | 00000 |
5/16" | 0.035" | Brass | 1,200 psi @ 72° F | 1/2" | 7/16" | 00000000 | 00000 |
3/8" | 0.035" | Brass | 1,000 psi @ 72° F | 9/16" | 9/16" | 00000000 | 00000 |
1/2" | 0.049" | Brass | 1,100 psi @ 72° F | 3/4" | 1/2" | 00000000 | 00000 |
5/8" | 0.065" | Brass | 1,300 psi @ 72° F | 7/8" | 19/32" | 00000000 | 00000 |

For Tube | |||||
---|---|---|---|---|---|
OD | Wall Thick. | Nut Material | Max. Pressure | Each | |
1/8" | 0.035" | Brass | 2,700 psi @ 72° F | 00000000 | 00000 |
1/4" | 0.035" | Brass | 1,200 psi @ 72° F | 00000000 | 0000 |
5/16" | 0.035" | Brass | 1,200 psi @ 72° F | 00000000 | 0000 |
3/8" | 0.035" | Brass | 1,000 psi @ 72° F | 00000000 | 0000 |
1/2" | 0.049" | Brass | 1,200 psi @ 72° F | 00000000 | 0000 |
5/8" | 0.065" | Brass | 1,300 psi @ 72° F | 00000000 | 0000 |

For Tube | |||||
---|---|---|---|---|---|
OD | Wall Thick. | Sleeve Material | Max. Pressure | Each | |
1/8" | 0.035" | Brass | 2,700 psi @ 72° F | 00000000 | 00000 |
1/4" | 0.035" | Brass | 1,200 psi @ 72° F | 00000000 | 0000 |
5/16" | 0.035" | Brass | 1,200 psi @ 72° F | 00000000 | 0000 |
3/8" | 0.035" | Brass | 1,000 psi @ 72° F | 00000000 | 0000 |
1/2" | 0.049" | Brass | 1,200 psi @ 72° F | 00000000 | 0000 |
5/8" | 0.065" | Brass | 1,300 psi @ 72° F | 00000000 | 0000 |
Compression Fittings for Stainless Steel Tubing

- 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:
303 Stainless Steel and 360 Brass: Use with welded or seamless 304 or 316 stainless steel
316 Stainless Steel: Use with seamless 304 or 316/316L/316Ti stainless steel that meets DIN EN 10216-5 or DIN EN 10305-1
316 Stainless Steel with 17-4 PH Stainless Steel Sleeve: Use with welded or seamless 304 or 316 stainless steel that meets ASTM A269 - Specifications Met:
316 Stainless Steel: ISO 8434, DIN 2353
316 Stainless Steel with 17-4 PH Stainless Steel Sleeve: SAE J514
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.
316 stainless steel fittings have excellent corrosion resistance.
ISO and DIN fittings meet international dimensional standards.
For technical drawings and 3-D models, click on a part number.

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 | Sleeve Material | Max. Pressure | Temp. Range, °F | For Hole Dia. | For Min. Wall Thick., mm | For Max. Wall Thick. | Each | |
1/4" | 0.035" | 316 Stainless Steel | 17-4 PH Stainless Steel | 4,000 psi @ 72° F | -420° to 1200° | 7/16" | __ | 29/64" | 000000000 | 000000 |
3/8" | 0.035" | 316 Stainless Steel | 17-4 PH Stainless Steel | 2,600 psi @ 72° F | -420° to 1200° | 9/16" | __ | 17/32" | 000000000 | 00000 |
1/2" | 0.049" | 316 Stainless Steel | 17-4 PH Stainless Steel | 1,900 psi @ 72° F | -420° to 1200° | 3/4" | __ | 37/64" | 000000000 | 00000 |
3/4" | 0.065" | 316 Stainless Steel | 17-4 PH Stainless Steel | 1,900 psi @ 72° F | -420° to 1200° | 1 1/16" | __ | 7/8" | 000000000 | 000000 |
6mm | 1mm | 316 Stainless Steel | 316 Stainless Steel | 7,200 psi @ 72° F | -75° to 750° | 14mm | 20 | __ | 0000000 | 00000 |
8mm | 1-1.5mm | 316 Stainless Steel | 316 Stainless Steel | 7,200 psi @ 72° F | -75° to 750° | 16mm | 19 | __ | 0000000 | 00000 |
10mm | 1-2mm | 316 Stainless Steel | 316 Stainless Steel | 7,200 psi @ 72° F | -75° to 750° | 18mm | 18 | __ | 0000000 | 00000 |

For Tube | ||||||
---|---|---|---|---|---|---|
OD | Wall Thick. | Nut Material | Max. Pressure | Temp. Range, °F | Each | |
1/4" | 0.035" | 316 Stainless Steel | 4,000 psi @ 72° F | -420° to 1200° | 000000000 | 00000 |
3/8" | 0.035" | 316 Stainless Steel | 2,600 psi @ 72° F | -420° to 1200° | 000000000 | 0000 |
1/2" | 0.049" | 316 Stainless Steel | 1,900 psi @ 72° F | -420° to 1200° | 000000000 | 0000 |
3/4" | 0.065" | 316 Stainless Steel | 1,900 psi @ 72° F | -420° to 1200° | 000000000 | 00000 |
6mm | 1mm | 316 Stainless Steel | 7,200 psi @ 72° F | -75° to 750° | 0000000 | 0000 |
8mm | 1-1.5mm | 316 Stainless Steel | 7,200 psi @ 72° F | -75° to 750° | 0000000 | 0000 |
10mm | 1-2mm | 316 Stainless Steel | 7,200 psi @ 72° F | -75° to 750° | 0000000 | 0000 |

For Tube | ||||||
---|---|---|---|---|---|---|
OD | Wall Thick. | Sleeve Material | Max. Pressure | Temp. Range, °F | Each | |
1/4" | 0.035" | 17-4 PH Stainless Steel | 4,000 psi @ 72° F | -420° to 1200° | 000000000 | 00000 |
3/8" | 0.035" | 17-4 PH Stainless Steel | 2,600 psi @ 72° F | -420° to 1200° | 000000000 | 0000 |
1/2" | 0.049" | 17-4 PH Stainless Steel | 1,900 psi @ 72° F | -420° to 1200° | 000000000 | 0000 |
3/4" | 0.065" | 17-4 PH Stainless Steel | 1,900 psi @ 72° F | -420° to 1200° | 000000000 | 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.

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 | For Hole Dia. | For Max. Wall Thick. | Each | |
1/16" | 0.02" | 316 Stainless Steel | 7,500 psi @ 72° F | 3/16" | 1/8" | 0000000 | 000000 |
1/8" | 0.035" | 316 Stainless Steel | 5,500 psi @ 72° F | 5/16" | 1/2" | 00000000 | 00000 |
3/16" | 0.035" | 316 Stainless Steel | 5,500 psi @ 72° F | 3/8" | 1/2" | 00000000 | 00000 |
1/4" | 0.035" | 316 Stainless Steel | 4,000 psi @ 72° F | 7/16" | 17/32" | 00000000 | 00000 |
5/16" | 0.035" | 316 Stainless Steel | 3,200 psi @ 72° F | 1/2" | 9/16" | 00000000 | 00000 |
3/8" | 0.035" | 316 Stainless Steel | 2,600 psi @ 72° F | 9/16" | 9/16" | 00000000 | 00000 |
1/2" | 0.035" | 316 Stainless Steel | 2,100 psi @ 72° F | 3/4" | 19/32" | 0000000 | 00000 |
5/8" | 0.049" | 316 Stainless Steel | 2,100 psi @ 72° F | 7/8" | 19/32" | 0000000 | 00000 |
3/4" | 0.049" | 316 Stainless Steel | 2,100 psi @ 72° F | 1" | 25/32" | 0000000 | 00000 |

For Tube | |||||
---|---|---|---|---|---|
OD | Wall Thick. | Nut Material | Max. Pressure | Each | |
1/16" | 0.02" | Molybdenum-Disulfide-Coated 316 Stainless Steel | 7,500 psi @ 72° F | 00000000 | 00000 |
3/16" | 0.035" | Molybdenum-Disulfide-Coated 316 Stainless Steel | 5,500 psi @ 72° F | 00000000 | 0000 |
1/4" | 0.035" | Molybdenum-Disulfide-Coated 316 Stainless Steel | 4,000 psi @ 72° F | 00000000 | 0000 |
5/16" | 0.035" | Molybdenum-Disulfide-Coated 316 Stainless Steel | 3,200 psi @ 72° F | 00000000 | 0000 |
3/8" | 0.035" | Molybdenum-Disulfide-Coated 316 Stainless Steel | 2,600 psi @ 72° F | 00000000 | 0000 |
1/2" | 0.035" | Molybdenum-Disulfide-Coated 316 Stainless Steel | 2,100 psi @ 72° F | 00000000 | 0000 |
5/8" | 0.049" | Molybdenum-Disulfide-Coated 316 Stainless Steel | 2,100 psi @ 72° F | 00000000 | 00000 |
3/4" | 0.049" | Molybdenum-Disulfide-Coated 316 Stainless Steel | 2,100 psi @ 72° F | 00000000 | 00000 |

For Tube | |||||
---|---|---|---|---|---|
OD | Wall Thick. | Sleeve Material | Max. Pressure | Each | |
1/16" | 0.02" | 316 Stainless Steel | 7,500 psi @ 72° F | 00000000 | 00000 |
1/8" | 0.035" | 316 Stainless Steel | 5,500 psi @ 72° F | 00000000 | 0000 |
3/16" | 0.035" | 316 Stainless Steel | 5,500 psi @ 72° F | 00000000 | 0000 |
1/4" | 0.035" | 316 Stainless Steel | 4,000 psi @ 72° F | 00000000 | 0000 |
5/16" | 0.035" | 316 Stainless Steel | 3,200 psi @ 72° F | 00000000 | 0000 |
3/8" | 0.035" | 316 Stainless Steel | 2,600 psi @ 72° F | 00000000 | 0000 |
1/2" | 0.035" | 316 Stainless Steel | 2,100 psi @ 72° F | 00000000 | 0000 |
5/8" | 0.049" | 316 Stainless Steel | 2,100 psi @ 72° F | 00000000 | 0000 |
3/4" | 0.049" | 316 Stainless Steel | 2,100 psi @ 72° F | 00000000 | 0000 |
Compression Fittings for Steel Tubing

- For Use With: Inch: Air, Hydraulic Fluid, Water
Metric: Hydraulic Fluid - Tubing: Inch: Use with welded steel
Metric: Use with seamless steel - Specifications Met: Inch: SAE J514
Metric: ISO 8434, DIN 2353
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 and bite fittings.
Zinc-plated steel fittings have fair corrosion resistance.
For technical drawings and 3-D models, click on a part number.

- Temperature Range: See table
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 | |
1/4" | 0.035" | Zinc-Plated Steel | 4,000 psi @ 72° F | -65° to 400° | 7/16" | 3/8" | 000000000 | 000000 |
3/8" | 0.035" | Zinc-Plated Steel | 3,000 psi @ 72° F | -65° to 400° | 9/16" | 13/32" | 000000000 | 0000 |
1/2" | 0.049" | Zinc-Plated Steel | 2,000 psi @ 72° F | -65° to 400° | 3/4" | 13/32" | 000000000 | 00000 |
3/4" | 0.065" | Zinc-Plated Steel | 2,000 psi @ 72° F | -65° to 400° | 1 1/16" | 7/16" | 000000000 | 00000 |
6mm | Not Rated | Zinc-Plated Steel | 3,600 psi @ 72° F | -20° to 230° | 13mm | 23mm | 00000000 | 00000 |
8mm | Not Rated | Zinc-Plated Steel | 3,600 psi @ 72° F | -20° to 230° | 15mm | 24mm | 00000000 | 00000 |
10mm | Not Rated | Zinc-Plated Steel | 3,600 psi @ 72° F | -20° to 230° | 17mm | 24mm | 00000000 | 00000 |
12mm | Not Rated | Zinc-Plated Steel | 3,600 psi @ 72° F | -20° to 230° | 19mm | 25mm | 00000000 | 00000 |

- Temperature Range: See table
For Tube OD | Nut Material | Max. Pressure | Temp. Range, °F | Each | |
1/4" | Zinc-Plated Steel | 4,000 psi @ 72° F | -65° to 400° | 000000000 | 00000 |
3/8" | Zinc-Plated Steel | 3,000 psi @ 72° F | -65° to 400° | 000000000 | 0000 |
1/2" | Zinc-Plated Steel | 2,000 psi @ 72° F | -65° to 400° | 000000000 | 0000 |
3/4" | Zinc-Plated Steel | 2,000 psi @ 72° F | -65° to 400° | 000000000 | 0000 |
6mm | Zinc-Plated Steel | 3,600 psi @ 72° F | -20° to 230° | 00000000 | 0000 |
8mm | Zinc-Plated Steel | 3,600 psi @ 72° F | -20° to 230° | 00000000 | 0000 |
10mm | Zinc-Plated Steel | 3,600 psi @ 72° F | -20° to 230° | 00000000 | 0000 |
12mm | Zinc-Plated Steel | 3,600 psi @ 72° F | -20° to 230° | 00000000 | 0000 |

- Temperature Range: See table
For Tube OD | Sleeve Material | Max. Pressure | Temp. Range, °F | Each | |
1/4" | Zinc-Plated Steel | 4,000 psi @ 72° F | -65° to 400° | 000000000 | 00000 |
3/8" | Zinc-Plated Steel | 3,000 psi @ 72° F | -65° to 400° | 000000000 | 0000 |
1/2" | Zinc-Plated Steel | 2,000 psi @ 72° F | -65° to 400° | 000000000 | 0000 |
3/4" | Zinc-Plated Steel | 2,000 psi @ 72° F | -65° to 400° | 000000000 | 0000 |
6mm | Zinc-Plated Steel | 3,600 psi @ 72° F | -20° to 230° | 00000000 | 000 |
8mm | Zinc-Plated Steel | 3,600 psi @ 72° F | -20° to 230° | 00000000 | 000 |
10mm | Zinc-Plated Steel | 3,600 psi @ 72° F | -20° to 230° | 00000000 | 000 |
12mm | Zinc-Plated Steel | 3,600 psi @ 72° F | -20° to 230° | 00000000 | 000 |
Compression Tube Fittings for Food and Beverage

- Temperature Range: -40° to 200° F
- Tubing: Use with firm or hard (Durometer 45D-65D) EVA plastic, nylon plastic, polyethylene plastic, polypropylene plastic, or polyurethane rubber
- Specifications Met: NSF/ANSI 51
A single sleeve (ferrule) and a gripping ring compress the tubing as you tighten the nut, creating a strong seal. The nut, sleeve, and gripping ring are included. Fittings are also known as flareless fittings. They are nylon for excellent impact and abrasion resistance.
For technical drawings and 3-D models, click on a part number.

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 | Material | Color | Gripping Ring Material | Max. Pressure | For Hole Dia. | For Max. Wall Thick. | Each | |
1/4" | Nylon Plastic | White | 302 Stainless Steel | 300 psi @ 72° F | 5/8" | 3/8" | 000000000 | 00000 |
5/16" | Nylon Plastic | White | 302 Stainless Steel | 300 psi @ 72° F | 5/8" | 3/8" | 000000000 | 0000 |
3/8" | Nylon Plastic | White | 302 Stainless Steel | 250 psi @ 72° F | 3/4" | 1/2" | 000000000 | 0000 |
1/2" | Nylon Plastic | White | 302 Stainless Steel | 200 psi @ 72° F | 15/16" | 1/2" | 000000000 | 0000 |

Nut | Sleeve | |||||||
---|---|---|---|---|---|---|---|---|
For Tube OD | Material | Color | Material | Color | Gripping Ring Material | Max. Pressure | Each | |
1/4" | Nylon Plastic | White | Nylon Plastic | White | 302 Stainless Steel | 300 psi @ 72° F | 000000000 | 00000 |
5/16" | Nylon Plastic | White | Nylon Plastic | White | 302 Stainless Steel | 300 psi @ 72° F | 000000000 | 0000 |
3/8" | Nylon Plastic | White | Nylon Plastic | White | 302 Stainless Steel | 250 psi @ 72° F | 000000000 | 0000 |
1/2" | Nylon Plastic | White | Nylon Plastic | White | 302 Stainless Steel | 200 psi @ 72° F | 000000000 | 0000 |

Tube supports are recommended if you want to use fittings with soft plastic and rubber tubing to prevent the tube from collapsing.