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 Extreme-Pressure Brass Threaded Pipe Fittings
Also known as instrumentation fittings, these have the most precise threads and the tightest tolerances of all the brass pipe fittings we offer. Fittings are brass for good corrosion resistance.
Inline tees are also known as branch tees. Right-angle tees are also known as run tees.
For technical drawings and 3-D models, click on a part number.
- For Use With: Air, Argon, Natural Gas, Nitrogen Gas, Oil, Oxygen, Steam, Water
- Specifications Met: ASME B1.20.1, ASME B31.1, ASME B31.3
Pipe Size | Max. Pressure | Max. Steam Pressure | Each | |
NPT Female | ||||
|---|---|---|---|---|
| 1/8 | 2,900 psi @ 72° F | 1,500 psi @ 300° F | 0000000 | 000000 |
| 1/4 | 3,000 psi @ 72° F | 1,500 psi @ 300° F | 0000000 | 00000 |
| 3/8 | 2,700 psi @ 72° F | 1,500 psi @ 300° F | 0000000 | 00000 |
| 1/2 | 2,500 psi @ 72° F | 1,500 psi @ 300° F | 0000000 | 00000 |
| 3/4 | 2,000 psi @ 72° F | 1,500 psi @ 300° F | 0000000 | 000000 |
- For Use With: Air, Argon, Natural Gas, Nitrogen Gas, Oil, Oxygen, Steam, Water
- Specifications Met: ASME B1.20.1, ASME B31.1, ASME B31.3
| Pipe Size | Max. Pressure | Max. Steam Pressure | Each | |
NPT Male | ||||
|---|---|---|---|---|
| 1/8 | 5,000 psi @ 72° F | 1,500 psi @ 300° F | 00000000 | 000000 |
| 1/4 | 4,100 psi @ 72° F | 1,500 psi @ 300° F | 00000000 | 00000 |
| 3/8 | 4,000 psi @ 72° F | 1,500 psi @ 300° F | 00000000 | 00000 |
| 1/2 | 3,100 psi @ 72° F | 1,500 psi @ 300° F | 00000000 | 00000 |
| 3/4 | 3,400 psi @ 72° F | 1,500 psi @ 300° F | 00000000 | 000000 |
- For Use With: Air, Argon, Natural Gas, Nitrogen Gas, Oil, Oxygen, Steam, Water
- Specifications Met: ASME B1.20.1, ASME B31.1, ASME B31.3
- For Use With: Air, Argon, Natural Gas, Nitrogen Gas, Oil, Oxygen, Steam, Water
- Specifications Met: ASME B1.20.1, ASME B31.1, ASME B31.3
| Pipe Size | Max. Pressure | Max. Steam Pressure | Each | |
NPT Female × NPT Male | ||||
|---|---|---|---|---|
| 1/8 | 2,900 psi @ 72° F | 1,500 psi @ 300° F | 0000000 | 000000 |
| 1/4 | 3,000 psi @ 72° F | 1,500 psi @ 300° F | 0000000 | 00000 |
| 3/8 | 2,700 psi @ 72° F | 1,500 psi @ 300° F | 0000000 | 00000 |
| 1/2 | 2,500 psi @ 72° F | 1,500 psi @ 300° F | 0000000 | 00000 |
| 3/4 | 2,000 psi @ 72° F | 1,500 psi @ 300° F | 0000000 | 000000 |
Ultra-High-Polish Gasket Fittings for Stainless Steel Tubing
- For Use With: Ammonia, Argon, Butane, Carbon Dioxide, Chloride, Fluoride, Fluorocarbon, Germane, Halide, Helium, Hydrogen, Krypton, Laser Gas, Natural Gas, Neon, Nitrogen, Oxygen, Silane, Sulfur Hexafluoride, Tungsten Hexafluoride, Xenon
- Temperature Range: -420° to 1000° F
- Tubing: Use with 316/316L stainless steel
- Compatible With: Swagelok® VCR
Polished to at least a 15 Ra finish on the inside, these fittings have an ultra-smooth interior surface that helps prevent contamination. Also known as ultra-high-purity fittings, they’re packed in a Class 100 clean room, cleaned, and double bagged. They are commonly used in semiconductor applications. Fittings use a metal gasket (sold separately), which generates fewer particles than a rubber gasket and creates a strong seal in high-pressure and high-vacuum applications. Fittings are 316 stainless steel for excellent corrosion resistance.
To assemble, place a gasket between the gasket ends before gently rotating the female-threaded fitting onto the male-threaded fitting. Tighten until 1/8 of a turn past finger tight.
For technical drawings and 3-D models, click on a part number.
| For Tube OD | Material | Max. Pressure | Max. Vacuum | Interior Smoothness, Ra | Environmental Rating | Each | |
| 1/4" | 316L Stainless Steel | 5,100 psi @ 72° F | 10 -11 torr @ 72° F | 5 | Fed. Std. Class 100 | 00000000 | 000000 |
| For Tube OD | Nut Material | Max. Pressure | Max. Vacuum | Lg. | Each | |
Male | ||||||
|---|---|---|---|---|---|---|
| 1/4" | 316L Stainless Steel | 5,100 psi @ 72° F | 10 -11 torr @ 72° F | 17/32" | 00000000 | 00000 |
| 1/4" | 316L Stainless Steel | 5,100 psi @ 72° F | 10 -11 torr @ 72° F | 23/32" | 0000000 | 0000 |
Female | ||||||
| 1/4" | 316L Stainless Steel | 5,100 psi @ 72° F | 10 -11 torr @ 72° F | 13/16" | 0000000 | 0000 |
Retaining
Tabs
Nickel gaskets are softer than stainless steel gaskets, so they won’t wear down sealing surfaces as much, and they’re easier to tighten. They’re reactive to carbon monoxide and ozone, so they shouldn’t be used with those chemicals.
Hard and heat resistant, stainless steel gaskets can be used in a wider range of applications than nickel gaskets such as carbon monoxide and ozone. However, they’re harder to tighten than nickel gaskets, and they’ll wear down sealing surfaces more quickly.
Silver-plated stainless steel gaskets are softer than unfinished stainless steel gaskets, so they won’t wear down sealing surfaces as much, and they’re easier to tighten. However, they oxidize when exposed to air, and silver particles might flake off during assembly.
Gaskets with retaining tabs stay in place during installation, so you don’t have to hold the gasket while fastening fittings together. This also means they’re less likely to scratch or nick your fittings by rotating during installation.
| For Tube OD | Max. Vacuum | Environmental Rating | Each | |
Nickel Gasket | ||||
|---|---|---|---|---|
| 1/4" | 10 -11 torr @ 72° F | Fed. Std. Class 100 | 00000000 | 00000 |
316L Stainless Steel Gasket | ||||
| 1/4" | 10 -11 torr @ 72° F | Fed. Std. Class 100 | 0000000 | 0000 |
Silver-Plated 316L Stainless Steel Gasket | ||||
| 1/4" | 10 -11 torr @ 72° F | Fed. Std. Class 100 | 00000000 | 0000 |
316L Stainless Steel Gasket with Retaining Tabs | ||||
| 1/4" | 10 -11 torr @ 72° F | Fed. Std. Class 100 | 00000000 | 0000 |