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About O-Rings
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Find the right size, compare compatible materials, and choose the best cross section shape for your O-ring.
Oil-Resistant Buna-N O-Ring Assortments
 |  |
382 and 385 Pieces | 380, 436, and 500 Pieces |
With a range of sizes on hand, you’ll always have the right O-ring for the job. Made of Buna-N, the O-rings in these assortments resist grease, hydraulic oil, and motor oil. They also withstand mild chemicals and water, although they’ll break down from exposure to brake fluid. Their resistance to compression and tearing helps them keep their shape over time, so they’re often used to seal power transmission assemblies and pneumatic cylinders.
No. of Pieces | No. of Sizes Included | Includes | Specs. Met | Temp. Range, ° F | Each | |||
|---|---|---|---|---|---|---|---|---|
Durometer 70A (Medium) | ||||||||
Black | ||||||||
| 380 | 36 | 1.9 mm wide o-rings (2.8, 3.8, 4.8, 5.8, 6.8, 7.8, 8.8, 9.8 mm IDs) 2.4 mm wide o-rings (9.8, 10.8, 11, 11.8, 12.8, 13.8, 14.8, 15.8, 17.8, 19.8, 20.8, 21.8 mm IDs) 3.1 mm wide o-rings (24.4, 29.4 mm IDs) 3.5 mm wide o-rings (21.7, 22.1, 23.7, 24.7, 25.2, 25.7, 27.7, 28.7, 29.2, 29.7, 30.7, 31.2 mm IDs) 4.0 mm wide o-rings (14.5, 23.5 mm IDs) | ASTM D2000, SAE J200 | -25 to 250 | 93025K41 | 000000 | ||
| 385 | 30 | 2.0 mm wide o-rings (3, 4, 5, 6, 7, 8, 10 mm IDs) 2.5 mm wide o-rings (10, 11, 12, 14, 16, 17, 19 mm IDs) 3.0 mm wide o-rings (19, 20, 22, 24, 25, 27, 28, 30, 32, 33, 35, 36, 38 mm IDs) 4.0 mm wide o-rings (38, 41, 44 mm IDs) | ASTM D2000, ISO 3601, SAE J200 | -25 to 250 | 9690K21 | 00000 | ||
| 500 | 36 | 1.5 mm wide o-rings (5, 13, 16 mm IDs) 1.6 mm wide o-rings (2.2, 3.1, 4.1, 7.1, 9.1, 10.1, 13.1 mm IDs) 2.0 mm wide o-rings (4, 6, 8, 9, 10, 12, 14, 16, 19, 20 mm IDs) 2.4 mm wide o-rings (4.3, 5.3, 5.6, 7.6, 8.3, 8.6 mm IDs) 2.5 mm wide o-rings (10, 13-19 mm IDs) 3.0 mm wide o-rings (9, 10, 11 mm IDs) | ASTM D2000, ISO 3601, SAE J200 | -25 to 250 | 9443K36 | 00000 | ||
Chemical-Resistant Viton® Fluoroelastomer O-Ring Assortments
No. of Pieces | No. of Sizes Included | Includes | Specs. Met | Temp. Range, ° F | Each | |||
|---|---|---|---|---|---|---|---|---|
Durometer 75A (Medium) | ||||||||
Black | ||||||||
| 500 | 36 | 1.5 mm wide o-rings (5, 13, 16 mm IDs) 1.6 mm wide o-rings (2.2, 3.1, 4.1, 7.1, 9.1, 10.1, 13.1 mm IDs) 2.0 mm wide o-rings (4, 6, 8, 9, 10, 12, 14, 16, 19, 20 mm IDs) 2.4 mm wide o-rings (4.3, 5.3, 5.6, 7.6, 8.3, 8.6 mm IDs) 2.5 mm wide o-rings (10, 13-19 mm IDs) 3.0 mm wide o-rings (9, 10, 11 mm IDs) | ASTM D2000, SAE J200 | -15 to 400 | 9443K39 | 0000000 | ||
Oil-Resistant Hard Buna-N O-Ring Assortments
|
382 and 385 Pieces |
Stock a variety of sizes so you always have the O-ring you need. With a 90A durometer, the O-rings in these assortments are harder and more wear-resistant than standard Buna-N O-rings. They resist petroleum and grease, so they’re often used in hydraulic and pneumatic systems.
No. of Pieces | No. of Sizes Included | Includes | Specs. Met | Temp. Range, ° F | Hardness | Color | Each | ||
|---|---|---|---|---|---|---|---|---|---|
| 385 | 30 | 2.0 mm wide o-rings (3, 4, 5, 6, 7, 8, 10 mm IDs) 2.5 mm wide o-rings (10, 11, 12, 14, 16, 17, 19 mm IDs) 3.0 mm wide o-rings (19, 20, 22, 24, 25, 27, 28, 30, 32, 33, 35, 36, 38 mm IDs) 4.0 mm wide o-rings (38, 41, 44 mm IDs) | ASTM D2000, SAE J200 | -25 to 250 | Durometer 90A (Hard) | Black | 9690K24 | 000000 |
Make-Your-Own O-Ring Kits with Cord Stock
 |
Everything you need to make custom O-rings on demand. These kits include cord stock, a razor blade, a splicing jig, and adhesive. The adhesive does not work well on silicone—if you want to make silicone O-rings, consider a hot-bonding kit instead.
Buna-N
O-Ring Bonding Kits | Replacement Adhesives (0.1 fl. oz) | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Round—Durometer 50A (Soft) | Round—Durometer 70A (Medium) | Round—Durometer 90A (Hard) | Square—Durometer 70A (Medium) | |||||||||||
Wd. | Temp. Range, ° F | Color | Lg., ft. | Each | Each | Each | Each | Each | ||||||
| 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 5 mm, 5.7 mm, 8.4 mm | -25 to 212 | Black | 3 | 9543N12 | 000000 | 9693K1 | 000000 | 9543N15 | 000000 | 9543N18 | 000000 | 7625A16 | 00000 | |
| 0.07", 0.103", 0.139", 0.21", 0.275", 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 5 mm, 5.7 mm, 8.4 mm | -25 to 212 | Black | 3 | 9543N13 | 000000 | 9410K11 | 00000 | 9543N16 | 00000 | 9543N19 | 000000 | 7625A16 | 0000 | |
Viton® Fluoroelastomer
O-Ring Bonding Kits | Replacement Adhesives (0.1 fl. oz) | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Round—Durometer 60A (Soft) | Round—Durometer 75A (Medium) | Round—Durometer 90A (Hard) | Square—Durometer 75A (Medium) | |||||||||||
Wd. | Temp. Range, ° F | Color | Lg., ft. | Each | Each | Each | Each | Each | ||||||
| 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 5 mm, 5.7 mm, 8.4 mm | 5 to 395 | Black | 3 | 9543N24 | 0000000 | 9543N21 | 0000000 | 9543N27 | 0000000 | 9543N31 | 0000000 | 7625A16 | 00000 | |
| 0.07", 0.103", 0.139", 0.21", 0.275", 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 5 mm, 5.7 mm, 8.4 mm | 5 to 395 | Black | 3 | 9543N25 | 000000 | 9543N22 | 000000 | 9543N28 | 000000 | 9543N32 | 000000 | 7625A16 | 0000 | |
EPDM
O-Ring Bonding Kits | Replacement Adhesives (0.1 fl. oz) | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Round—Durometer 60A (Soft) | Round—Durometer 70A (Medium) | Round—Durometer 90A (Hard) | Square—Durometer 70A (Medium) | |||||||||||
Wd. | Temp. Range, ° F | Color | Lg., ft. | Each | Each | Each | Each | Each | ||||||
| 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 5 mm, 5.7 mm, 8.4 mm | -40 to 250 | Black | 3 | 9543N36 | 000000 | 9543N33 | 000000 | 9543N39 | 000000 | 9543N43 | 000000 | 74555A44 | 00000 | |
| 0.07", 0.103", 0.139", 0.21", 0.275", 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 5 mm, 5.7 mm, 8.4 mm | -40 to 250 | Black | 3 | 9543N37 | 000000 | 9543N34 | 00000 | 9543N41 | 000000 | 9543N44 | 000000 | 74555A44 | 0000 | |
Cutting Tools
 |
Cutting Tool |
For Cord OD | Each | ||
|---|---|---|---|
| 0.103" to 0.551" | 9450K108 | 000000 |
Make-Your-Own Hot-Bonding O-Ring Kits
 |
Combine heat and adhesive to create O-rings with stronger, more flexible bonds than those made with adhesive alone. These kits include all the tools you need for custom O-rings—just add cord stock. All include adhesive for silicone; adhesive for other materials is sold separately.
Cannot Be Sold To—VOC (Volatile Organic Compounds) regulations restrict sales to the listed jurisdictions/ areas.
System of Measurement | For Use On | For Cord Stock Wd. | Includes | Each | ||
|---|---|---|---|---|---|---|
| Metric | Buna-N, EPDM, Neoprene, Silicone Rubber, Viton® Fluoroelastomer | 1.6 mm, 2.4 mm, 3 mm, 3.5 mm, 4 mm, 5 mm, 5.7 mm, 8.4 mm | O-Ring Vulcanizer Gloves Cutting Tool L-Key 0.25 lb. Sheet of Silicone Adhesive for Bonding Silicone Cord Stock | 9450K106 | 000000000 | |
| Inch/Metric | Buna-N, EPDM, Neoprene, Silicone Rubber, Viton® Fluoroelastomer | 0.07", 0.103", 0.139", 0.21", 0.275", 0.312", 0.375", 0.5", 1.6 mm, 2.4 mm, 3 mm, 3.5 mm, 4 mm, 5 mm, 5.7 mm, 8.4 mm | O-Ring Vulcanizer Gloves Cutting Tool L-Key 0.25 lb. Sheet of Silicone Adhesive for Bonding Silicone Cord Stock | 9450K107 | 00000000 |
