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 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.
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 |
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. | Specifications Met | Each | |
| 1/8" | 0.035" | Zinc-Plated Steel | 6,800 psi @ 72° F | -20° to 395° | 5/16" | 1/2" | ASTM A108 | 00000000 | 000000 |
| 1/4" | 0.035" | Zinc-Plated Steel | 4,900 psi @ 72° F | -20° to 395° | 7/16" | 13/32" | ASTM A108 | 00000000 | 00000 |
| 3/8" | 0.035" | Zinc-Plated Steel | 3,100 psi @ 72° F | -20° to 395° | 9/16" | 7/16" | ASTM A108 | 00000000 | 00000 |
| 1/2" | 0.035" | Zinc-Plated Steel | 2,300 psi @ 72° F | -20° to 395° | 3/4" | 1/2" | ASTM A108 | 00000000 | 00000 |
For Tube | |||||||
|---|---|---|---|---|---|---|---|
| OD | Wall Thick. | Nut Material | Max. Pressure | Temp. Range, °F | Specifications Met | Each | |
| 1/8" | 0.035" | Zinc-Plated Steel | 6,800 psi @ 72° F | -20° to 395° | ASTM A108 | 00000000 | 00000 |
| 1/4" | 0.035" | Zinc-Plated Steel | 4,900 psi @ 72° F | -20° to 395° | ASTM A108 | 00000000 | 0000 |
| 3/8" | 0.035" | Zinc-Plated Steel | 3,100 psi @ 72° F | -20° to 395° | ASTM A108 | 00000000 | 0000 |
| 1/2" | 0.035" | Zinc-Plated Steel | 2,300 psi @ 72° F | -20° to 395° | ASTM A108 | 00000000 | 0000 |
| 6mm | 0.8mm | Zinc-Plated Steel | 4,400 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 | |
| 1/8" | 0.035" | Zinc-Plated Steel | 316 Stainless Steel | 6,800 psi @ 72° F | -20° to 800° | ASME B31.3 | 00000000 | 00000 |
| 1/4" | 0.035" | Zinc-Plated Steel | 316 Stainless Steel | 4,850 psi @ 72° F | -20° to 800° | ASME B31.3 | 00000000 | 0000 |
| 3/8" | 0.035" | Zinc-Plated Steel | 316 Stainless Steel | 3,100 psi @ 72° F | -20° to 800° | ASME B31.3 | 00000000 | 00000 |
| 1/2" | 0.035" | Zinc-Plated Steel | 316 Stainless Steel | 2,300 psi @ 72° F | -20° to 800° | ASME B31.3 | 00000000 | 00000 |
| 6mm | 0.8mm | Zinc-Plated Steel | 316 Stainless Steel | 4,400 psi @ 72° F | -20° to 800° | ASME B31.3 | 00000000 | 0000 |
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.
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 |
| 1/8" | 0.035" | Brass | 2,900 psi @ 72° F | 00000000 | 00000 |
| 3/16" | 0.035" | Brass | 2,300 psi @ 72° F | 00000000 | 00000 |
| 1/4" | 0.035" | Brass | 1,600 psi @ 72° F | 00000000 | 00000 |
| 5/16" | 0.035" | Brass | 1,300 psi @ 72° F | 00000000 | 00000 |
| 3/8" | 0.035" | Brass | 1,000 psi @ 72° F | 00000000 | 00000 |
| 1/2" | 0.035" | Brass | 800 psi @ 72° F | 00000000 | 00000 |
| 5/8" | 0.049" | Brass | 900 psi @ 72° F | 00000000 | 00000 |
| 3/4" | 0.049" | Brass | 700 psi @ 72° F | 00000000 | 00000 |
| 1" | 0.065" | Brass | 700 psi @ 72° F | 00000000 | 00000 |
| For Tube OD | Nut Material | Max. Pressure | Each | |
| 1/16" | Brass | 5,400 psi @ 72° F | 00000000 | 00000 |
| 1/8" | Brass | 2,900 psi @ 72° F | 00000000 | 0000 |
| 3/16" | Brass | 2,300 psi @ 72° F | 00000000 | 0000 |
| 1/4" | Brass | 1,600 psi @ 72° F | 00000000 | 0000 |
| 5/16" | Brass | 1,300 psi @ 72° F | 00000000 | 0000 |
| 3/8" | Brass | 1,000 psi @ 72° F | 00000000 | 0000 |
| 1/2" | Brass | 800 psi @ 72° F | 00000000 | 0000 |
| 5/8" | Brass | 900 psi @ 72° F | 00000000 | 0000 |
| 3/4" | Brass | 700 psi @ 72° F | 00000000 | 0000 |
| 1" | Brass | 800 psi @ 72° F | 00000000 | 00000 |
| For Tube OD | Sleeve Material | Front Sleeve Lg. | Back Sleeve Lg. | Max. Pressure | Each | |
| 1/16" | Brass | 3/32" | 1/16" | 5,400 psi @ 72° F | 00000000 | 00000 |
| 1/8" | Brass | 3/16" | 3/32" | 2,900 psi @ 72° F | 00000000 | 0000 |
| 3/16" | Brass | 3/16" | 3/32" | 2,300 psi @ 72° F | 00000000 | 0000 |
| 1/4" | Brass | 3/16" | 3/32" | 1,600 psi @ 72° F | 00000000 | 0000 |
| 5/16" | Brass | 3/16" | 3/32" | 1,300 psi @ 72° F | 00000000 | 0000 |
| 3/8" | Brass | 3/16" | 3/32" | 1,000 psi @ 72° F | 00000000 | 0000 |
| 1/2" | Brass | 19/64" | 5/32" | 800 psi @ 72° F | 00000000 | 0000 |
| 5/8" | Brass | 19/64" | 5/32" | 900 psi @ 72° F | 00000000 | 00000 |
| 3/4" | Brass | 19/64" | 5/32" | 700 psi @ 72° F | 00000000 | 0000 |
| 1" | Brass | 3/8" | 13/16" | 800 psi @ 72° F | 00000000 | 00000 |