About Sealant Flexibility
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About O-Rings
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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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Gasketing for Vacuum Workholding Plates
For applications requiring only part of the vacuum plate surface, use gasketing to seal off the in-use area. Cut to length. Choose the cross-section shape recommended by your vacuum workholding system manufacturer to ensure the best performance.
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 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 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 |
High-Vacuum Chemical-Resistant Viton® Fluoroelastomer O-Rings
These O-rings are heat-treated, cleaned, and double-bagged in an ISO Class 5 (Fed. Std. Class 100) clean room for use in high-vacuum systems. Also known as baked O-rings, they are heated to 300° F to remove trapped air, gases, and other impurities that can escape and contaminate a vacuum system. Made of fluoroelastomer, these O-rings won’t degrade when exposed to chemicals such as benzene, butyl alcohol, and ethylene glycol. They have a round profile and are made to standard SAE AS568 sizes.
For technical drawings and 3-D models, click on a part number.
Fractional | Actual | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Dash Number | ID | OD | ID | OD | Hardness | Environmental Rating | Specifications Met | Temperature Range, °F | Color | Each | |
Wd.: 1/16 Fractional (0.07" Actual) | |||||||||||
| 006 | 1/8 | 1/4 | 0.114" | 0.254" | Durometer 75A (Medium) | Fed. Std. Class 100, ISO Class 5 | ASTM D2000, SAE AS568 | -15° to 400° | Black | 0000000 | 000000 |
| 008 | 3/16 | 5/16 | 0.176" | 0.316" | Durometer 75A (Medium) | Fed. Std. Class 100, ISO Class 5 | ASTM D2000, SAE AS568 | -15° to 400° | Black | 0000000 | 00000 |
| 010 | 1/4 | 3/8 | 0.239" | 0.379" | Durometer 75A (Medium) | Fed. Std. Class 100, ISO Class 5 | ASTM D2000, SAE AS568 | -15° to 400° | Black | 0000000 | 00000 |
| 011 | 5/16 | 7/16 | 0.301" | 0.441" | Durometer 75A (Medium) | Fed. Std. Class 100, ISO Class 5 | ASTM D2000, SAE AS568 | -15° to 400° | Black | 0000000 | 00000 |
| 012 | 3/8 | 1/2 | 0.364" | 0.504" | Durometer 75A (Medium) | Fed. Std. Class 100, ISO Class 5 | ASTM D2000, SAE AS568 | -15° to 400° | Black | 0000000 | 00000 |
| 013 | 7/16 | 9/16 | 0.426" | 0.566" | Durometer 75A (Medium) | Fed. Std. Class 100, ISO Class 5 | ASTM D2000, SAE AS568 | -15° to 400° | Black | 0000000 | 00000 |
| 014 | 1/2 | 5/8 | 0.489" | 0.629" | Durometer 75A (Medium) | Fed. Std. Class 100, ISO Class 5 | ASTM D2000, SAE AS568 | -15° to 400° | Black | 0000000 | 00000 |
| 015 | 9/16 | 11/16 | 0.551" | 0.691" | Durometer 75A (Medium) | Fed. Std. Class 100, ISO Class 5 | ASTM D2000, SAE AS568 | -15° to 400° | Black | 0000000 | 00000 |
Low-Outgassing Silicone Sealants
Tested to meet ASTM E595, a standard used by NASA, these sealants fill joints and seams while releasing almost no volatile emissions that could damage sensitive electronics, even in a vacuum. Made of silicone, they’re RTV (room-temperature vulcanizing), so they’ll fully harden at room temperature.
Elongation indicates flexibility—the higher the value is, the more a sealant can stretch.
Sealants that begin to harden in 26 min. are less likely to trap contaminants than those that take longer to harden.
Container | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Size, fl. oz. | Type | Begins to Harden | Reaches Full Strength | Elongation | Joint Compression/ Expansion Tolerance | Tensile Strength, psi | Hardness | Temp. Range, °F | Specifications Met | For Joining | Color | Each | |
| 5 | Tube | 26 min. | 3 days | 610% | Not Rated | 925 | Durometer 41A (Medium Soft) | -45° to 390° | ASTM E595 | Metal Plastic Rubber Glass Masonry | Clear | 0000000 | 0000000 |
| 5.8 | Cartridge | 150 min. | 7 days | 420% | -25% to 25% | 600 | Durometer 36A (Medium Soft) | -200° to 500° | ASTM E595 | Metal Plastic Rubber Composites Glass | White | 0000000 | 000000 |
Vacuum Leak Sealants
Seal leaks on vacuum systems and components.
Epoxy resin sealants, also known as Torr Seals, form a rigid bond.
Bentonite/petrolatum sealants, also known as Apiezon sealants, form a flexible, non-hardening seal that’s easy to remove and reposition.
Container | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Size | Type | Begins to Harden | Reaches Full Strength | Vacuum Rating, torr | Maximum Vacuum @ Temperature | Tensile Strength, psi | Hardness | Mix Ratio | Temp. Range, °F | For Joining | Color | Each | |
Epoxy Resin | |||||||||||||
| 1.7 fl. oz. | Cartridge | 60 min. | 3 days | Ultra High | 10 -9 torr @ 72° F | 5,000 | Extra Hard (Durometer 75D) | 2:1 | -45° to 245° | Metal, Glass, Masonry | Off-White | 0000000 | 0000000 |
| 4.2 fl. oz. | Tube | 60 min. | 3 days | Ultra High | 10 -9 torr @ 72° F | 5,000 | Extra Hard (Durometer 75D) | 2:1 | -45° to 245° | Metal, Glass, Masonry | Off-White | 0000000 | 000000 |
Bentonite/Petrolatum | |||||||||||||
| 2.2 lbs. | Can | 5 min. | 1 hrs. | High | 10 -4 torr @ 72° F | Not Rated | Not Rated | __ | 15° to 85° | Metal, Plastic, Glass | Gray | 0000000 | 000000 |
Container | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Size, fl. oz. | Type | Begins to Harden | Reaches Full Strength | Vacuum Rating, torr | Maximum Vacuum @ Temperature | Tensile Strength, psi | Hardness | Mix Ratio | Temp. Range, °F | For Joining | Color | Each | |
Epoxy Resin | |||||||||||||
| 1.7 | Cartridge | 60 min. | 3 days | Ultra High | 10 -9 torr @ 72° F | 5,000 | Extra Hard (Durometer 75D) | 2:1 | -45° to 245° | Metal, Glass, Masonry | Off-White | 0000000 | 0000000 |
| Loading Method | For Cartridge Size | Material | Each | |
| Cartridge | 1.7 oz. | Plastic | 0000000 | 0000000 |