Metric O-Ring Kits | McMaster-Carr

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Viton® Fluoroelastomer

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41 Products

About O-Rings

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

380-Piece Assortment

382- and 385-Piece Assortment

All of the O-rings in these assortments are made of Buna-N. They resist animal, vegetable, and motor oils. All have a round profile and are suitable for a wide range of static and dynamic sealing applications.

Metric O-rings are sized to the actual measured inside diameter.

Durometer 70A (Medium)
Number of Pieces	Number of Sizes Included	Includes	Specifications Met	Temperature Range, °F		Each
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, JIS B 2401	-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	-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	-25° to 250°	9443K36	00000

Oil-Resistant Hard Buna-N O-Ring Assortments

382- and 385-Piece Assortment

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.

Number of Pieces	Number of Sizes Included	Includes	Specifications 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

Chemical-Resistant Viton® Fluoroelastomer O-Ring Assortments

500-Piece Assortment

All of the O-rings in these assortments are Viton® fluoroelastomer and resist isopropyl alcohol, mineral oils, and transmission fluid. They have a round profile and are suitable for a wide range of static and dynamic sealing applications.

Metric O-rings are sized to the actual measured inside diameter.

Durometer 75A (Medium)
No. of Pieces	No. of Sizes Included	Includes	Specifications Met	Temp. Range, °F		Each
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

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 resists grease, hydraulic oil, and motor oil, in addition to mild chemicals and water.

Viton® fluoroelastomer holds up to a wide range of chemicals. It also resists transmission fluid.

EPDM withstands water, steam, and glycol-based fluids, including brake fluid.

Buna-N Rubber

O-Ring Kits						Replacement Adhesives (0.1 fl. oz)
Wd.	Temperature Range, °F	Color	Lg., ft.		Each		Each
Round—Durometer 50A (Soft)
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	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	7625A16	0000
Round—Durometer 70A (Medium)
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	9693K1	00000	7625A16	0000
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	9410K11	00000	7625A16	0000
Round—Durometer 90A (Hard)
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	9543N15	00000	7625A16	0000
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	9543N16	00000	7625A16	0000
Square—Durometer 70A (Medium)
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	9543N18	00000	7625A16	0000
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	9543N19	000000	7625A16	0000

Viton® Fluoroelastomer Rubber

O-Ring Kits						Replacement Adhesives (0.1 fl. oz)
Wd.	Temperature Range, °F	Color	Lg., ft.		Each		Each
Round—Durometer 60A (Soft)
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	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	7625A16	0000
Round—Durometer 75A (Medium)
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	9543N21	000000	7625A16	0000
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	9543N22	000000	7625A16	0000
Round—Durometer 90A (Hard)
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	9543N27	000000	7625A16	0000
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	9543N28	000000	7625A16	0000
Square—Durometer 75A (Medium)
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	9543N31	000000	7625A16	0000
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	9543N32	000000	7625A16	0000

EPDM Rubber

O-Ring Kits						Replacement Adhesives (0.1 fl. oz)
Wd.	Temperature Range, °F	Color	Lg., ft.		Each		Each
Round—Durometer 60A (Soft)
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	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	74555A44	0000
Round—Durometer 70A (Medium)
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	9543N33	00000	74555A44	0000
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	9543N34	00000	74555A44	0000
Round—Durometer 90A (Hard)
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	9543N39	00000	74555A44	0000
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	9543N41	000000	74555A44	0000
Square—Durometer 70A (Medium)
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	9543N43	00000	74555A44	0000
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	9543N44	000000	74555A44	0000

Replacement Splicing Jigs

For Cord Shape		Each
Round	9462K2	00000
Square	9543N45	0000

Cutting Tools

		Each
	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.

System of Measurement	For Cord Stock Wd.	Includes	For Use On		Each
Metric	1.6 mm, 2.4 mm, 3 mm, 3.5 mm, 4 mm, 5 mm, 5.7 mm, 8.4 mm	O-Ring Vulcanizer 4" × 4" sheet of silicone adhesive for bonding silicone cord stock Gloves Cutting Tool L-Key	EPDM Rubber, Silicone Rubber, Buna-N Rubber, Viton® Fluoroelastomer Rubber, Neoprene Rubber	9450K106	000000000
Inch/Metric	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 4" × 4" sheet of silicone adhesive for bonding silicone cord stock Gloves Cutting Tool L-Key	EPDM Rubber, Silicone Rubber, Buna-N Rubber, Viton® Fluoroelastomer Rubber, Neoprene Rubber	9450K107	00000000

Replacement Cutting Tool	9450K108	Each	000000
Adhesive for Viton® Fluoroelastomer Rubber (8 fl. oz.)	9450K102	Each	00000
Adhesive for EPDM Rubber (16 fl. oz.)	9450K103	Each	00000
Replacement Adhesive for Silicone Rubber (4" × 4" Sheet)	9450K34	Each	00000
Adhesive for Neoprene Rubber (16 fl. oz.)	9450K104	Each	00000
Adhesive for Buna-N Rubber (16 fl. oz.)	9450K101	Each	00000