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.
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
- 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:
NPT: ASME B1.20.1, ASME B31.1, ASME B31.3
BSPT: ASME B31.3, DIN 2999, ISO 7.1
Pipe Size | Plug Construction | Max. Pressure | Max. Steam Pressure | Each | |
NPT Male | |||||
|---|---|---|---|---|---|
| 1/8 | Hollow | 5,600 psi @ 72° F | 1,500 psi @ 300° F | 0000000 | 00000 |
| 1/4 | Hollow | 4,100 psi @ 72° F | 1,500 psi @ 300° F | 0000000 | 0000 |
| 3/8 | Hollow | 4,000 psi @ 72° F | 1,500 psi @ 300° F | 0000000 | 00000 |
| 1/2 | Hollow | 3,900 psi @ 72° F | 1,500 psi @ 300° F | 0000000 | 00000 |
| 3/4 | Hollow | 3,800 psi @ 72° F | 1,500 psi @ 300° F | 0000000 | 00000 |
BSPT Male | |||||
| 1/4 | Hollow | 3,300 psi @ 72° F | 1,500 psi @ 300° F | 00000000 | 00000 |
| 1 | Hollow | 2,200 psi @ 72° F | 1,500 psi @ 300° F | 00000000 | 00000 |
Brass and Bronze Unthreaded Pipe Flanges
Bolt these flanges to equipment or to another same-size, flat-surface flange with a gasket (sold separately). They have good corrosion resistance.
Cap flanges are also known as blind flanges.
For technical drawings and 3-D models, click on a part number.
- For Use With: Air, Argon, Natural Gas, Nitrogen Gas, Oil, Oxygen, Water
- Pressure Class : 150
- Specifications Met: ASME B16.24
- Pipe Nipples and Pipe: Use Schedule 40 brass
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.
Caps replace a female nut to close off the end of a line.
| For Tube OD | Material | Max. Pressure | Max. Vacuum | Environmental Rating | Each | |
| 1/8" | 316L Stainless Steel | 8,500 psi @ 72° F | 10 -11 torr @ 72° F | Fed. Std. Class 100 | 00000000 | 000000 |
| 1/4" | 316L Stainless Steel | 5,100 psi @ 72° F | 10 -11 torr @ 72° F | Fed. Std. Class 100 | 0000000 | 00000 |
| 1/2" | 316L Stainless Steel | 3,500 psi @ 72° F | 10 -11 torr @ 72° F | Fed. Std. Class 100 | 0000000 | 00000 |
| 3/4" | 316L Stainless Steel | 3,350 psi @ 72° F | 10 -11 torr @ 72° F | Fed. Std. Class 100 | 00000000 | 00000 |
| 1" | 316L Stainless Steel | 2,400 psi @ 72° F | 10 -11 torr @ 72° F | Fed. Std. Class 100 | 00000000 | 00000 |
Plugs replace a male nut to close off the end of a line.
| For Tube OD | Material | Max. Pressure | Max. Vacuum | Environmental Rating | Each | |
| 1/8" | 316L Stainless Steel | 8,500 psi @ 72° F | 10 -11 torr @ 72° F | Fed. Std. Class 100 | 00000000 | 00000 |
| 1/4" | 316L Stainless Steel | 5,100 psi @ 72° F | 10 -11 torr @ 72° F | Fed. Std. Class 100 | 0000000 | 00000 |
| 1/2" | 316L Stainless Steel | 3,500 psi @ 72° F | 10 -11 torr @ 72° F | Fed. Std. Class 100 | 0000000 | 00000 |
| 3/4" | 316L Stainless Steel | 3,350 psi @ 72° F | 10 -11 torr @ 72° F | Fed. Std. Class 100 | 00000000 | 00000 |
| 1" | 316L Stainless Steel | 2,400 psi @ 72° F | 10 -11 torr @ 72° F | Fed. Std. Class 100 | 00000000 | 00000 |
| For Tube OD | Nut Material | Max. Pressure | Max. Vacuum | Lg. | Each | |
Male | ||||||
|---|---|---|---|---|---|---|
| 1/8" | 316L Stainless Steel | 8,500 psi @ 72° F | 10 -11 torr @ 72° F | 1/2" | 00000000 | 00000 |
| 1/4" | 316L Stainless Steel | 5,100 psi @ 72° F | 10 -11 torr @ 72° F | 17/32" | 00000000 | 0000 |
| 1/4" | 316L Stainless Steel | 5,100 psi @ 72° F | 10 -11 torr @ 72° F | 23/32" | 0000000 | 0000 |
| 1/2" | 316L Stainless Steel | 3,500 psi @ 72° F | 10 -11 torr @ 72° F | 13/16" | 0000000 | 00000 |
| 3/4" | 316L Stainless Steel | 3,350 psi @ 72° F | 10 -11 torr @ 72° F | 1" | 00000000 | 00000 |
| 1" | 316L Stainless Steel | 2,400 psi @ 72° F | 10 -11 torr @ 72° F | 1 3/16" | 00000000 | 00000 |
Female | ||||||
| 1/8" | 316L Stainless Steel | 8,500 psi @ 72° F | 10 -11 torr @ 72° F | 17/32" | 00000000 | 0000 |
| 1/4" | 316L Stainless Steel | 5,100 psi @ 72° F | 10 -11 torr @ 72° F | 13/16" | 0000000 | 0000 |
| 1/2" | 316L Stainless Steel | 3,500 psi @ 72° F | 10 -11 torr @ 72° F | 7/8" | 0000000 | 00000 |
| 3/4" | 316L Stainless Steel | 3,350 psi @ 72° F | 10 -11 torr @ 72° F | 1 1/8" | 00000000 | 00000 |
| 1" | 316L Stainless Steel | 2,400 psi @ 72° F | 10 -11 torr @ 72° F | 1 11/32" | 00000000 | 00000 |
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 |
| 1/2" | 10 -11 torr @ 72° F | Fed. Std. Class 100 | 00000000 | 0000 |
316L Stainless Steel Gasket | ||||
| 1/4" | 10 -11 torr @ 72° F | Fed. Std. Class 100 | 0000000 | 0000 |
| 1/2" | 10 -11 torr @ 72° F | Fed. Std. Class 100 | 0000000 | 0000 |
| 3/4" | 10 -11 torr @ 72° F | Fed. Std. Class 100 | 00000000 | 00000 |
| 1" | 10 -11 torr @ 72° F | Fed. Std. Class 100 | 00000000 | 00000 |
Silver-Plated 316L Stainless Steel Gasket | ||||
| 1/4" | 10 -11 torr @ 72° F | Fed. Std. Class 100 | 00000000 | 0000 |
| 1/2" | 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 |
| 1/2" | 10 -11 torr @ 72° F | Fed. Std. Class 100 | 00000000 | 0000 |