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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Plastic Pipe Fittings for Oil
Made of corrosion-resistant plastic, these fittings won’t deteriorate when used in oil applications. They also have high strength and impact resistance. Apply a non-hardening, plastic-compatible sealant to the male threads to prevent leaks. Tape or sealants with PTFE are not recommended for plastic-to-plastic threaded connections. When making a threaded connection be careful not to overtighten the threads. To prevent cracks and leaks, finger tighten the fitting, then wrench-tighten one to two turns.
Through-wall fittings are also known as bulkhead couplings and panel-mount couplings; they mount through a wall, tank, or panel to create an inlet or outlet for faucets, pipes, and spigots. They are for use on flat and curved surfaces.
Warning: Never use plastic pipe fittings and pipe with compressed air or gas.
For technical drawings and 3-D models, click on a part number.
- For Use With: Oil
- Temperature Range: -20° to 140° F
Connectors | Replacement Gaskets | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Pipe Size  | For Hole Dia. | For Max. Wall Thick. | Material | Color | Gasket Material | Max. Pressure | Each | Each | ||
NPT Threads | ||||||||||
| 3/4 | 1 11/16" | 7/16" | Polyethylene Plastic | Black | EPDM Rubber | 120 psi @ 72° F | 000000 | 000000 | 00000000 | 00000 |
| 1 | 2 5/8" | 9/16" | Polyethylene Plastic | Black | EPDM Rubber | 120 psi @ 72° F | 000000 | 00000 | 00000000 | 0000 |
| 1 1/4 | 2 5/8" | 9/16" | Polyethylene Plastic | Black | EPDM Rubber | 120 psi @ 72° F | 000000 | 00000 | 00000000 | 0000 |
| 1 1/2 | 2 5/8" | 9/16" | Polyethylene Plastic | Black | EPDM Rubber | 120 psi @ 72° F | 000000 | 00000 | 00000000 | 0000 |
| 2 | 3 1/4" | 9/16" | Polyethylene Plastic | Black | EPDM Rubber | 120 psi @ 72° F | 000000 | 00000 | 00000000 | 0000 |
Spin-Weld Through-Wall Plastic Tank Fittings
Create a leak-free, durable connection in plastic tanks, walls, or panels without gaskets or sealants. As you spin these fittings with a handheld electric router, they melt into the surface of your tank for a seal without any joints. To hold these fittings in your router, you’ll need the installation tool (sold separately).
For proper installation, you’ll want to use a hole saw to drill a hole that matches the For Hole Diameter listed and check that your router meets the speed and power requirements shown in the table.
For technical drawings and 3-D models, click on a part number.
- For Use With: Oil, Water
- Temperature Range: 40° to 140° F
For Tank | For Router | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Pipe Size | Hose Size | For Hole Dia. | For Min. Wall Thick. | Lg. | Material | Material | Surface | Color | Power | Speed, rpm | Each | |
NPT Female Threaded Pipe × Weld | ||||||||||||
| 1/4 | __ | 0.88" | 3/16" | 15/16" | LDPE Plastic | LDPE Plastic | Flat | White | 1 1/2 | 18,000-25,000 | 0000000 | 00000 |
| 1/2 | __ | 0.88" | 3/16" | 7/8" | LDPE Plastic | LDPE Plastic | Flat | White | 1 1/2 | 18,000-25,000 | 0000000 | 0000 |
| 3/4 | __ | 1.31" | 3/16" | 13/16" | LDPE Plastic | LDPE Plastic | Flat | White | 1 1/2 | 18,000-25,000 | 0000000 | 0000 |
| 1 | __ | 1.5" | 3/16" | 1" | LDPE Plastic | LDPE Plastic | Flat | White | 1 1/2 | 18,000-25,000 | 0000000 | 0000 |
| 1 1/2 | __ | 2" | 3/16" | 1 3/16" | LDPE Plastic | LDPE Plastic | Flat | White | 1 1/2 | 18,000-25,000 | 0000000 | 0000 |
| 2 | __ | 2.5" | 3/16" | 1 3/16" | LDPE Plastic | LDPE Plastic | Flat | White | 1 1/2 | 18,000-25,000 | 0000000 | 0000 |
GHT Male Threaded Hose × Weld | ||||||||||||
| __ | 3/4 | 1" | 3/16" | 7/8" | LDPE Plastic | LDPE Plastic | Flat | White | 1 1/2 | 18,000-25,000 | 0000000 | 0000 |
| For Pipe Size | For Hose Size | Shank Dia. | Overall Lg. | Material | Shank Type | For Tool Type | Each | |
For Pipe Connection | ||||||||
|---|---|---|---|---|---|---|---|---|
| 1/4 | __ | 1/4" | 1 5/8" | Aluminum | Straight | Hand Router | 000000 | 0000000 |
| 1/2 | __ | 1/4" | 1 5/8" | Aluminum | Straight | Hand Router | 000000 | 000000 |
| 3/4 | __ | 1/2" | 2" | Aluminum | Straight | Hand Router | 000000 | 000000 |
| 1 | __ | 1/2" | 2 1/4" | Aluminum | Straight | Hand Router | 000000 | 000000 |
| 1 1/2 | __ | 1/2" | 2 1/4" | Aluminum | Straight | Hand Router | 000000 | 000000 |
| 2 | __ | 1/2" | 2 1/4" | Aluminum | Straight | Hand Router | 000000 | 000000 |
For Hose Connection | ||||||||
| __ | 3/4 | 1/4" | 1 3/4" | Aluminum | Straight | Hand Router | 000000 | 000000 |
High-Pressure Brass Threaded Pipe Fittings
These fittings have the strength to handle high-pressure applications. They are brass for good corrosion resistance.
Through-wall fittings are also known as bulkhead couplings and panel-mount couplings; they mount through a wall or panel to create an inlet or outlet.
NPTF (Dryseal) threads are compatible with NPT threads.
For technical drawings and 3-D models, click on a part number.
- For Use With:
NPT Threads: Air, Water
NPTF, BSPP and Metric Threads: Air, Natural Gas, Oil, Water - Specifications Met: See table
| Pipe Size | Thread Size | For Hole Dia. | For Max. Wall Thick. | Max. Pressure | Specifications Met | Each | |
NPTF Female | |||||||
|---|---|---|---|---|---|---|---|
| 1 | __ | __ | __ | 1,000 psi @ 72° F | __ | 000000000 | 000000 |
BSPP Female | |||||||
| 1/8 | __ | 11/16" | 11/32" | 1,000 psi @ 72° F | SAE J530, SAE J531 | 000000000 | 00000 |
| 1/4 | __ | 13/16" | 37/64" | 1,000 psi @ 72° F | SAE J530, SAE J531 | 000000000 | 00000 |
| 3/8 | __ | 1 1/16" | 35/64" | 1,000 psi @ 72° F | SAE J530, SAE J531 | 000000000 | 00000 |
| 1/2 | __ | 1 1/8" | 25/32" | 1,000 psi @ 72° F | SAE J530, SAE J531 | 000000000 | 00000 |
| 3/4 | __ | 1 3/8" | 7/8" | 1,000 psi @ 72° F | SAE J530, SAE J531 | 000000000 | 00000 |
| 1 | __ | 1 11/16" | 61/64" | 1,000 psi @ 72° F | SAE J530, SAE J531 | 000000000 | 00000 |
Metric Female | |||||||
| __ | M5 × 0.8 mm | 7/16" | 17/64" | 1,000 psi @ 72° F | SAE J530, SAE J531 | 000000000 | 00000 |
High-Pressure Plated Brass Threaded Pipe Fittings
The plating on these brass fittings creates a shiny finish and provides extra protection in corrosive environments. Fittings have the strength to handle high-pressure applications.
Nickel-plated brass fittings provide better corrosion resistance than unplated brass fittings.
Through-wall fittings are also known as bulkhead couplings and panel-mount couplings; they mount through a wall or panel to create an inlet or outlet.
For technical drawings and 3-D models, click on a part number.
- For Use With: Air, Natural Gas, Oil, Water
Nickel-Plated Brass | |||||
|---|---|---|---|---|---|
| Pipe Size | Thread Size | For Max. Wall Thick. | Max. Pressure | Each | |
BSPP Female × Metric Male | |||||
| 1/8 | M16 × 1.5 mm | 0.394" | 2,170 psi @ 72° F | 00000000 | 00000 |
| 1/4 | M20 × 1.5 mm | 0.63" | 1,450 psi @ 72° F | 00000000 | 0000 |
| 3/8 | M26 × 1.5 mm | 0.591" | 1,080 psi @ 72° F | 00000000 | 00000 |
| 1/2 | M28 × 1.5 mm | 0.827" | 725 psi @ 72° F | 00000000 | 00000 |
| 3/4 | M33 × 1.5 mm | 0.886" | 1,230 psi @ 72° F | 00000000 | 00000 |
- For Use With: Air, Natural Gas, Oil, Water
Thread Size | Nickel-Plated Brass | ||||
|---|---|---|---|---|---|
| (A) | (B) | For Max. Wall Thick. | Max. Pressure | Each | |
Metric Male × Metric Female | |||||
| M10 × 1 mm | M5 × 0.8 mm | 0.276" | 1,080 psi @ 72° F | 00000000 | 00000 |
Extreme-Pressure Stainless Steel Threaded Pipe Fittings
With the strength to handle extreme pressures, these fittings can be used to connect equipment in hydraulic fluid lines. 316 stainless steel fittings have excellent corrosion resistance.
Through-wall fittings are also known as bulkhead couplings; they mount through your wall to create an inlet or outlet. When installing, the gasket should be on the inside of the wall. BSPP and metric male threads have either a gasket or a gasket and washer to prevent leaks.
For technical drawings and 3-D models, click on a part number.
- For Use With: Hydraulic Fluid, Oil, Water
- Specifications Met: ISO 1179, ISO 8434-6
316 Stainless Steel | ||||||
|---|---|---|---|---|---|---|
| Pipe Size | Dash Size | For Max. Wall Thick., mm | Lg., mm | Max. Pressure | Each | |
BSPP Male | ||||||
| 1/8 | 02 | 8 | 43 | 5,000 psi @ 72° F | 00000000 | 000000 |
| 1/4 | 04 | 8 | 46 | 5,000 psi @ 72° F | 00000000 | 00000 |
| 3/8 | 06 | 8 | 55 | 5,000 psi @ 72° F | 00000000 | 00000 |
| 1/2 | 08 | 8 | 59 | 4,500 psi @ 72° F | 00000000 | 00000 |
| 3/4 | 12 | 8 | 64 | 3,600 psi @ 72° F | 00000000 | 000000 |
| 1 | 16 | 8 | 75 | 2,900 psi @ 72° F | 00000000 | 000000 |
- Temperature Range: -22° to 230° F
Compact Extreme-Pressure Steel Threaded Pipe Fittings
These fittings are strong enough to handle extreme pressures, yet small enough to fit into cramped spaces. They are galvanized and zinc-plated steel, which have better corrosion resistance than plain steel fittings.
Through-wall fittings are also known as bulkhead couplings; they mount through your wall to create an inlet or outlet. When installing, the gasket should be on the inside of the wall. BSPP and metric male threads have either a gasket, or a gasket and washer, to prevent leaks.
For technical drawings and 3-D models, click on a part number.
Threads with
Gasket and Washer
- For Use With: Air, Hydraulic Fluid, Oil, Water
- Specifications Met: ISO 1179, ISO 8434-6
| Pipe Size | Dash Size | For Hole Dia., mm | For Max. Wall Thick., mm | Max. Pressure | Material | Each | |
BSPP Male | |||||||
|---|---|---|---|---|---|---|---|
| 1/4 | 04 | 13 | 11.5 | 6,500 psi @ 72° F | Galvanized Steel | 00000000 | 00000 |
| 3/8 | 06 | 16.5 | 13.9 | 5,500 psi @ 72° F | Galvanized Steel | 00000000 | 00000 |
| 1/2 | 08 | 20.8 | 12.7 | 4,500 psi @ 72° F | Galvanized Steel | 00000000 | 00000 |
| 3/4 | 12 | 26.3 | 11.5 | 3,500 psi @ 72° F | Galvanized Steel | 00000000 | 00000 |
| 1 | 16 | 33.1 | 12.7 | 3,000 psi @ 72° F | Galvanized Steel | 00000000 | 00000 |
Through-Wall Fittings for High-Vacuum Chambers
- For Use With: See table
- Environment Temperature Range: 32° to 300° F
- Process Temperature Range: -325° to 995° F
- Tubing: Use with 304/304L or 316/316L stainless steel
- Specifications Met: See table
Transfer liquids and gasses into high-vacuum chambers with these assembled fittings, also known as feedthroughs. Because they form a tight seal on chamber walls, they are often used in coating, cooling, and leak-testing applications where negative pressure (vacuum) must be maintained. These fittings are ready to install and include high-vacuum fittings, metal tubing, and Yor-lok tube fittings. On each end, the Yor-lok fittings include a nut and two sleeves that grip your system’s stainless steel tubing. The entire assembly is stainless steel, so it resists rusting. These fittings are not for use in pressure applications.
Quick-clamp fittings meet ISO 2861, which specifies the dimensions of quick-clamp high-vacuum fittings, clamps, and rings to ensure vacuum tightness. These fittings require a clamp and ring (each sold separately) to complete the connection.
Flanged fittings require a gasket and bolt kit (each sold separately) to complete the connection.
For technical drawings and 3-D models, click on a part number.
For Tube | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Flange OD | High-Vacuum Flange Size | OD | Wall Thick. | Lg. | Max. Vacuum | Material | Specifications Met | Each | |
For Use With Acetone, Air, Ammonium Hydroxide, Helium, Methane, Nitrogen, Oil, Water | |||||||||
| 1.18" | 16 | 1/4" | 0.028"-0.095" | 8" | 1 × 10 -8 torr @ 72° F | 304 Stainless Steel | ISO 2861 | 0000000 | 0000000 |
| 1.57" | 25 | 1/4" | 0.028"-0.095" | 8" | 1 × 10 -8 torr @ 72° F | 304 Stainless Steel | ISO 2861 | 0000000 | 000000 |
| 2.16" | 40 | 1/4" | 0.028"-0.095" | 8" | 1 × 10 -8 torr @ 72° F | 304 Stainless Steel | ISO 2861 | 0000000 | 000000 |
| 2.95" | 50 | 1/4" | 0.028"-0.095" | 8" | 1 × 10 -8 torr @ 72° F | 304 Stainless Steel | ISO 2861 | 0000000 | 000000 |
Bolt Hole | For Tube | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Flange OD | High-Vacuum Flange Size | Bolt Circle Dia. | Dia. | No. of | OD | Wall Thick. | Lg. | Max. Vacuum | Material | Each | |
For Use With Acetone, Air, Ammonium Hydroxide, Helium, Methane, Nitrogen, Oil, Water | |||||||||||
| 1 21/64" | 16 | 1 1/16" | 11/64" | 6 | 1/4" | 0.028"-0.095" | 8" | 1 × 10 -13 torr @ 72° F | 304 Stainless Steel | 0000000 | 0000000 |
| 2 3/4" | 40 | 2 5/16" | 17/64" | 6 | 1/4" | 0.028"-0.095" | 8" | 1 × 10 -13 torr @ 72° F | 304 Stainless Steel | 0000000 | 000000 |
Material | ||||||
|---|---|---|---|---|---|---|
| For Flange OD | For High-Vacuum Flange Size | O-Ring | Inner Ring | Max. Vacuum | Each | |
| 1.18" | 16 | Fluoroelastomer Rubber | 304 Stainless Steel | 1 × 10 -7 torr @ 72° F | 00000000 | 00000 |
| 1.57" | 25 | Fluoroelastomer Rubber | 304 Stainless Steel | 1 × 10 -7 torr @ 72° F | 0000000 | 00000 |
| 2.16" | 40 | Fluoroelastomer Rubber | 304 Stainless Steel | 1 × 10 -7 torr @ 72° F | 0000000 | 00000 |
| 2.95" | 50 | Fluoroelastomer Rubber | 304 Stainless Steel | 1 × 10 -7 torr @ 72° F | 0000000 | 00000 |
