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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Oil-Resistant Buna-N Gaskets for Grooved-End Pipe Fittings
Create a tight seal on grooved-end pipe fittings that are exposed to oil. These gaskets are Buna-N, so they won't break down from oil.
For technical drawings and 3-D models, click on a part number.
| For Pipe Size  | ID | OD | Thick. | Max. Pressure, psi | Temperature Range, ° F | Color | Each | |
| 2 | 2 3/8" | 3 5/16" | 1 3/32" | 750 | -20° to 180° | Black | 00000000 | 000000 |
| 2 1/2 | 2 7/8" | 3 3/4" | 1 3/32" | 750 | -20° to 180° | Black | 0000000 | 00000 |
| 3 | 3 1/2" | 4 1/2" | 1 3/32" | 750 | -20° to 180° | Black | 00000000 | 00000 |
| 4 | 4 1/2" | 5 3/4" | 1 7/32" | 750 | -20° to 180° | Black | 00000000 | 00000 |
| 6 | 6 5/8" | 8" | 1 3/16" | 700 | -20° to 180° | Black | 0000000 | 000000 |
O-Rings for Brass Compression Tube Fittings for Air and Water
- For Use With: Air, Lubricated Air, Water
- Temperature Range: -20° to 212° F
Use these O-rings with brass compression tube fittings that have BSPP male threads. They create a seal on the BSPP male threads to guard against leaks.
For technical drawings and 3-D models, click on a part number.
| For Pipe Size | For Thread Type | For Gender | O-Ring Material | Max. Pressure | Each | |
| 1/8 | BSPP | Male | Buna-N Rubber, Steel | 2100 psi @ 72 ° F | 000000000 | 00000 |
| 1/4 | BSPP | Male | Buna-N Rubber, Steel | 2100 psi @ 72 ° F | 000000000 | 0000 |
| 3/8 | BSPP | Male | Buna-N Rubber, Steel | 1900 psi @ 72 ° F | 000000000 | 0000 |
| 1/2 | BSPP | Male | Buna-N Rubber, Steel | 1400 psi @ 72 ° F | 000000000 | 0000 |
| 3/4 | BSPP | Male | Buna-N Rubber, Steel | 1000 psi @ 72 ° F | 000000000 | 0000 |
| 1 | BSPP | Male | Buna-N Rubber, Steel | 1000 psi @ 72 ° F | 000000000 | 0000 |
Rings for Claw-Clamp and Bolt-Together
High-Vacuum Fittings for Stainless Steel Tubing
- For Use With: Air
- Max. Temperature: 400° F
- Tubing: Use with 304/304L Stainless Steel or 316/316L Stainless Steel
Create airtight seals in high-vacuum systems by placing these rings between two claw-clamp (ISO-K) or bolt-together (ISO-F) fittings. They contain a Viton® fluoroelastomer O-ring—when you clamp or bolt your fittings together, the O-ring compresses to establish the seal.
For technical drawings and 3-D models, click on a part number.
Claw-Clamp Connection | Flanged Connection | Material | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| For Tube OD | For Flange OD | For High-Vacuum Flange Size | High Vacuum Connection Type | For Tube OD | For Flange OD | For High-Vacuum Flange Size | High Vacuum Connection Type | O-Ring | Inner Ring | Max. Vacuum | Each | |
| 2 1/2" | 3.74" | 63 | ISO-K | 2 1/2" | 5.12" | __ | ISO-F | Viton® Fluoroelastomer Rubber | 304 Stainless Steel | 1 × 10 -9 torr @ 72° F | 0000000 | 000000 |
| 3" | 4.33" | 80 | ISO-K | 3" | 5.71" | 80 | ISO-F | Viton® Fluoroelastomer Rubber | 304 Stainless Steel | 1 × 10 -9 torr @ 72° F | 000000 | 00000 |
| 4" | 5.12" | 100 | ISO-K | 4" | 6.5" | 100 | ISO-F | Viton® Fluoroelastomer Rubber | 304 Stainless Steel | 1 × 10 -9 torr @ 72° F | 0000000 | 00000 |
| 6" | 7.09" | 160 | ISO-K | 6" | 8.86" | 160 | ISO-F | Viton® Fluoroelastomer Rubber | 304 Stainless Steel | 1 × 10 -9 torr @ 72° F | 0000000 | 00000 |
Rings for Quick-Clamp High-Vacuum Fittings for Stainless Steel Tubing
- For Use With: Air
- Temperature Range:
Rings with Fluoroelastomer O-Ring: 0° to 300° F
Rings with Silicone O-Ring: -50° to 390°F - Tubing: Use with 304/304L stainless steel, 316/316L stainless steel, or aluminum
- Specifications Met: ISO 2861
Use these rings with quick-clamp high-vacuum fittings. They consist of a stainless steel inner ring covered by an O-ring.
Silicone rubber O-rings withstand higher temperatures than fluoroelastomer ones.
Rings with a screen have a stainless steel screen to filter out large particles.
For technical drawings and 3-D models, click on a part number.
| For Tube OD | For Flange OD | For High-Vacuum Flange Size | High Vacuum Connection Type | Inner Ring Material | Max. Vacuum | Max. Pressure | Each | |
Fluoroelastomer Rubber O-Ring | ||||||||
|---|---|---|---|---|---|---|---|---|
Rings | ||||||||
| 1/2" | 1.18" | 10 | ISO-KF | 304 Stainless Steel | 1 × 10 -7 torr @ 72° F | Not Rated | 00000000 | 00000 |
| 3/4" | 1.18" | 16 | ISO-KF | 304 Stainless Steel | 1 × 10 -7 torr @ 72° F | Not Rated | 00000000 | 0000 |
| 1" | 1.57" | 25 | ISO-KF | 304 Stainless Steel | 1 × 10 -7 torr @ 72° F | Not Rated | 0000000 | 00000 |
| 1 1/2" | 2.16" | 40 | ISO-KF | 304 Stainless Steel | 1 × 10 -7 torr @ 72° F | Not Rated | 0000000 | 00000 |
| 2" | 2.95" | 50 | ISO-KF | 304 Stainless Steel | 1 × 10 -7 torr @ 72° F | Not Rated | 0000000 | 00000 |
Rings with Stainless Steel Screen | ||||||||
| 3/4" | 1.18" | 16 | ISO-KF | 304 Stainless Steel | 1 × 10 -7 torr @ 72° F | Not Rated | 00000000 | 00000 |
| 1" | 1.57" | 25 | ISO-KF | 304 Stainless Steel | 1 × 10 -7 torr @ 72° F | Not Rated | 00000000 | 00000 |
| 1 1/2" | 2.16" | 40 | ISO-KF | 304 Stainless Steel | 1 × 10 -7 torr @ 72° F | Not Rated | 00000000 | 00000 |
| 2" | 2.95" | 50 | ISO-KF | 304 Stainless Steel | 1 × 10 -7 torr @ 72° F | Not Rated | 00000000 | 00000 |
Rings with Aluminum Outer Ring | ||||||||
| 3/4" | 1.18" | 16 | ISO-KF | 304 Stainless Steel | 1 × 10 -7 torr @ 72° F | Not Rated | 00000000 | 00000 |
| 1" | 1.57" | 25 | ISO-KF | 304 Stainless Steel | 1 × 10 -7 torr @ 72° F | 100 psi @ 72° F | 0000000 | 00000 |
| 1 1/2" | 2.16" | 40 | ISO-KF | 304 Stainless Steel | 1 × 10 -7 torr @ 72° F | 75 psi @ 72° F | 0000000 | 00000 |
| 2" | 2.95" | 50 | ISO-KF | 304 Stainless Steel | 1 × 10 -7 torr @ 72° F | 50 psi @ 72° F | 0000000 | 00000 |
Silicone Rubber O-Ring | ||||||||
Rings | ||||||||
| 1/2" | 1.18" | 10 | ISO-KF | 304 Stainless Steel | 1 × 10 -7 torr @ 72° F | Not Rated | 00000000 | 00000 |
| 3/4" | 1.18" | 16 | ISO-KF | 304 Stainless Steel | 1 × 10 -7 torr @ 72° F | Not Rated | 00000000 | 00000 |
| 1" | 1.57" | 25 | ISO-KF | 304 Stainless Steel | 1 × 10 -7 torr @ 72° F | Not Rated | 00000000 | 00000 |
| 1 1/2" | 2.16" | 40 | ISO-KF | 304 Stainless Steel | 1 × 10 -7 torr @ 72° F | Not Rated | 00000000 | 00000 |
| 2" | 2.95" | 50 | ISO-KF | 304 Stainless Steel | 1 × 10 -7 torr @ 72° F | Not Rated | 00000000 | 00000 |
Rings for Quick-Clamp High-Vacuum Fittings for Aluminum Tubing
- For Use With: Air
- Temperature Range: 0° to 350° F
- Tubing: Use with aluminum
- Specifications Met: ISO 2861
Create an airtight seal between quick-clamp (ISO-KF) fittings—these rings complete high-vacuum connections. A Viton® fluoroelastomer O-ring compresses between the two fittings to establish the seal.
For technical drawings and 3-D models, click on a part number.
| For Tube OD | For Flange OD | For High-Vacuum Flange Size | High Vacuum Connection Type | Inner Ring Material | O-Ring Material | Max. Vacuum | Each | |
| 1/2" | 1.18" | 10 | ISO-KF | Aluminum | Viton® Fluoroelastomer Rubber | 1 × 10 -7 torr @ 72° F | 0000000 | 00000 |
| 3/4" | 1.18" | 16 | ISO-KF | Aluminum | Viton® Fluoroelastomer Rubber | 1 × 10 -7 torr @ 72° F | 0000000 | 0000 |
| 1" | 1.57" | 25 | ISO-KF | Aluminum | Viton® Fluoroelastomer Rubber | 1 × 10 -7 torr @ 72° F | 0000000 | 0000 |
| 1 1/2" | 2.16" | 40 | ISO-KF | Aluminum | Viton® Fluoroelastomer Rubber | 1 × 10 -7 torr @ 72° F | 0000000 | 00000 |
| 2" | 2.95" | 50 | ISO-KF | Aluminum | Viton® Fluoroelastomer Rubber | 1 × 10 -7 torr @ 72° F | 0000000 | 00000 |