Custom O-Rings | McMaster-Carr

	System of Measurement System of Measurement

Inch

Metric

	Width Width

	Fractional Width Fractional Width

	Material Material

Buna-N Rubber

Silicone Rubber

Fluoroelastomer Rubber

EPDM Rubber

	For Use With For Use With

	Color Color

	Black
	Red

	Hardness Hardness

Durometer 70A

Durometer 75A

	Maximum Temperature Maximum Temperature

	Minimum Temperature Minimum Temperature

	Maximum ID Maximum ID

50"

1,300mm

	Minimum ID Minimum ID

2 1/2"

63.5mm

	DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense Acquisition Regulations Supplement)

DFARS Specialty Metals
COTS-Exempt

	REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) REACH (Registration, Evaluation, Authorization and Restriction of Chemicals)

REACH Compliant

	RoHS (Restriction of Hazardous Substances) RoHS (Restriction of Hazardous Substances)

RoHS Compliant

Forward

How can we improve?

83 Products

About O-Rings

When you need a Buna-N O-ring that’s not an industry standard size, we can make one to fit your requirements. These O-rings resist grease, hydraulic oils, and motor oil, plus they're resilient and offer excellent tear resistance. They have a round profile and are suitable for a wide range of static and dynamic sealing applications.

Inch

Wd.
Fractional	Actual	ID Range	Specifications Met	Hardness	Temperature Range, °F	Color	Pkg. Qty.		Pkg.
1/16	0.07"	2.5" to 50"	ASTM D2000	Durometer 70A (Medium)	-20° to 250°	Black	10	0000000	000000
3/32	0.103"	2.5" to 50"	ASTM D2000	Durometer 70A (Medium)	-20° to 250°	Black	10	0000000	00000
1/8	0.125"	2.5" to 50"	ASTM D2000	Durometer 70A (Medium)	-20° to 250°	Black	10	0000000	00000
1/8	0.139"	2.5" to 50"	ASTM D2000	Durometer 70A (Medium)	-20° to 250°	Black	10	0000000	00000
3/16	0.21"	2.5" to 50"	ASTM D2000	Durometer 70A (Medium)	-20° to 250°	Black	10	0000000	00000
1/4	0.25"	2.5" to 50"	ASTM D2000	Durometer 70A (Medium)	-20° to 250°	Black	10	0000000	00000
1/4	0.275"	2.5" to 50"	ASTM D2000	Durometer 70A (Medium)	-20° to 250°	Black	10	0000000	00000
5/16	0.312"	2.5" to 50"	ASTM D2000	Durometer 70A (Medium)	-20° to 250°	Black	10	0000000	00000
3/8	0.375"	2.5" to 50"	ASTM D2000	Durometer 70A (Medium)	-20° to 250°	Black	10	0000000	00000

Metric

Wd., mm	ID Range, mm	Specifications Met	Hardness	Temperature Range, °F	Color	Pkg. Qty.		Pkg.
1.5	63.5 to 1,300	ASTM D2000	Durometer 70A (Medium)	-20° to 250°	Black	10	0000000	000000
2	63.5 to 1,300	ASTM D2000	Durometer 70A (Medium)	-20° to 250°	Black	10	0000000	00000
2.5	63.5 to 1,300	ASTM D2000	Durometer 70A (Medium)	-20° to 250°	Black	10	0000000	00000
3	63.5 to 1,300	ASTM D2000	Durometer 70A (Medium)	-20° to 250°	Black	10	0000000	00000
3.5	63.5 to 1,300	ASTM D2000	Durometer 70A (Medium)	-20° to 250°	Black	10	0000000	00000
4	63.5 to 1,300	ASTM D2000	Durometer 70A (Medium)	-20° to 250°	Black	10	0000000	00000
4.5	63.5 to 1,300	ASTM D2000	Durometer 70A (Medium)	-20° to 250°	Black	10	00000000	00000
5	63.5 to 1,300	ASTM D2000	Durometer 70A (Medium)	-20° to 250°	Black	10	0000000	00000
5.5	63.5 to 1,300	ASTM D2000	Durometer 70A (Medium)	-20° to 250°	Black	10	00000000	00000
5.7	63.5 to 1,300	ASTM D2000	Durometer 70A (Medium)	-20° to 250°	Black	10	0000000	00000
6	63.5 to 1,300	ASTM D2000	Durometer 70A (Medium)	-20° to 250°	Black	10	00000000	00000
8	63.5 to 1,300	ASTM D2000	Durometer 70A (Medium)	-20° to 250°	Black	10	0000000	00000

Made-to-Order High-Temperature Silicone O-Rings

When you need a silicone O-ring that’s not an industry standard size, we can make one to fit your requirements. These O-rings withstand temperatures up to 450° F. They have a round profile and are suitable for a wide range of static and dynamic sealing applications.

Inch

Wd.
Fractional	Actual	ID Range	Specifications Met	Hardness	Temperature Range, °F	Color	Pkg. Qty.		Pkg.
1/16	0.07"	2 1/2" to 50"	ASTM D2000	Durometer 70A (Medium)	-80° to 450°	Red	10	00000000	000000
3/32	0.103"	2 1/2" to 50"	ASTM D2000	Durometer 70A (Medium)	-80° to 450°	Red	10	00000000	00000
1/8	0.125"	2 1/2" to 50"	ASTM D2000	Durometer 70A (Medium)	-80° to 450°	Red	10	00000000	00000
1/8	0.139"	2 1/2" to 50"	ASTM D2000	Durometer 70A (Medium)	-80° to 450°	Red	10	00000000	00000
3/16	0.21"	2 1/2" to 50"	ASTM D2000	Durometer 70A (Medium)	-80° to 450°	Red	10	00000000	00000
1/4	0.25"	2 1/2" to 50"	ASTM D2000	Durometer 70A (Medium)	-80° to 450°	Red	10	00000000	00000
1/4	0.275"	2 1/2" to 50"	ASTM D2000	Durometer 70A (Medium)	-80° to 450°	Red	10	00000000	00000
5/16	0.312"	2 1/2" to 50"	ASTM D2000	Durometer 70A (Medium)	-80° to 450°	Red	10	00000000	00000
3/8	0.375"	2 1/2" to 50"	ASTM D2000	Durometer 70A (Medium)	-80° to 450°	Red	5	00000000	00000

Metric

Wd., mm	ID Range, mm	Specifications Met	Hardness	Temperature Range, °F	Color	Pkg. Qty.		Pkg.
1.5	63.5 to 1,300	ASTM D2000	Durometer 70A (Medium)	-80° to 450°	Red	10	00000000	000000
2	63.5 to 1,300	ASTM D2000	Durometer 70A (Medium)	-80° to 450°	Red	10	00000000	00000
2.5	63.5 to 1,300	ASTM D2000	Durometer 70A (Medium)	-80° to 450°	Red	10	00000000	00000
3	63.5 to 1,300	ASTM D2000	Durometer 70A (Medium)	-80° to 450°	Red	10	00000000	00000
3.5	63.5 to 1,300	ASTM D2000	Durometer 70A (Medium)	-80° to 450°	Red	10	00000000	00000
4	63.5 to 1,300	ASTM D2000	Durometer 70A (Medium)	-80° to 450°	Red	10	00000000	00000
4.5	63.5 to 1,300	ASTM D2000	Durometer 70A (Medium)	-80° to 450°	Red	5	00000000	00000
5	63.5 to 1,300	ASTM D2000	Durometer 70A (Medium)	-80° to 450°	Red	5	00000000	00000
5.5	63.5 to 1,300	ASTM D2000	Durometer 70A (Medium)	-80° to 450°	Red	5	00000000	00000
5.8	63.5 to 1,300	ASTM D2000	Durometer 70A (Medium)	-80° to 450°	Red	5	00000000	00000
6	63.5 to 1,300	ASTM D2000	Durometer 70A (Medium)	-80° to 450°	Red	5	00000000	00000
8	63.5 to 1,300	ASTM D2000	Durometer 70A (Medium)	-80° to 450°	Red	5	00000000	00000

Made-to-Order Chemical-Resistant Fluoroelastomer O-Rings

When you need a fluoroelastomer O-ring that’s not an industry standard size, we can make one to fit your requirements. Fluoroelastomer resists a wide range of chemicals, including benzene, butyl alcohol, and ethylene glycol. These O-rings have a round profile and are suitable for both static and dynamic sealing applications.

Inch

Wd.
Fractional	Actual	ID Range	Hardness	Specifications Met	Temperature Range, °F	Color	Pkg. Qty.		Pkg.
1/16	0.07"	2 1/2" to 50"	Durometer 75A (Medium)	ASTM D2000	-15° to 400°	Black	10	0000000	000000
3/32	0.103"	2 1/2" to 50"	Durometer 75A (Medium)	ASTM D2000	-15° to 400°	Black	10	0000000	00000
1/8	0.125"	2 1/2" to 50"	Durometer 75A (Medium)	ASTM D2000	-15° to 400°	Black	5	0000000	00000
1/8	0.139"	2 1/2" to 50"	Durometer 75A (Medium)	ASTM D2000	-15° to 400°	Black	5	0000000	00000
3/16	0.21"	2 1/2" to 50"	Durometer 75A (Medium)	ASTM D2000	-15° to 400°	Black	3	0000000	00000
1/4	0.25"	2 1/2" to 50"	Durometer 75A (Medium)	ASTM D2000	-15° to 400°	Black	2	0000000	00000
1/4	0.275"	2 1/2" to 50"	Durometer 75A (Medium)	ASTM D2000	-15° to 400°	Black	2	0000000	00000
5/16	0.312"	2 1/2" to 50"	Durometer 75A (Medium)	ASTM D2000	-15° to 400°	Black	2	0000000	00000
3/8	0.375"	2 1/2" to 50"	Durometer 75A (Medium)	ASTM D2000	-15° to 400°	Black	1	0000000	00000

Metric

Wd., mm	ID Range, mm	Hardness	Specifications Met	Temperature Range, °F	Color	Pkg. Qty.		Pkg.
1.6	63.5 to 1,300	Durometer 75A (Medium)	ASTM D2000	-15° to 400°	Black	10	0000000	000000
2	63.5 to 1,300	Durometer 75A (Medium)	ASTM D2000	-15° to 400°	Black	10	0000000	00000
2.5	63.5 to 1,300	Durometer 75A (Medium)	ASTM D2000	-15° to 400°	Black	10	0000000	00000
3	63.5 to 1,300	Durometer 75A (Medium)	ASTM D2000	-15° to 400°	Black	5	0000000	00000
3.5	63.5 to 1,300	Durometer 75A (Medium)	ASTM D2000	-15° to 400°	Black	5	0000000	00000
4	63.5 to 1,300	Durometer 75A (Medium)	ASTM D2000	-15° to 400°	Black	5	0000000	00000
4.5	63.5 to 1,300	Durometer 75A (Medium)	ASTM D2000	-15° to 400°	Black	5	0000000	00000
5	63.5 to 1,300	Durometer 75A (Medium)	ASTM D2000	-15° to 400°	Black	3	0000000	00000
5.7	63.5 to 1,300	Durometer 75A (Medium)	ASTM D2000	-15° to 400°	Black	3	00000000	00000
6	63.5 to 1,300	Durometer 75A (Medium)	ASTM D2000	-15° to 400°	Black	3	00000000	00000
8	63.5 to 1,300	Durometer 75A (Medium)	ASTM D2000	-15° to 400°	Black	2	00000000	00000

Made-to-Order Water- and Steam-Resistant EPDM O-Rings

When you need a EPDM O-ring that’s not an industry standard size, we can make one to fit your requirements. These resist water, steam, ethanol, and ethylene glycol. They have a round profile and are suitable for a wide range of static and dynamic sealing applications.

Inch

Wd.
Fractional	Actual	ID Range	Hardness	Specifications Met	Temperature Range, °F	Color	Pkg. Qty.		Pkg.
1/16	0.07"	2 1/2" to 50"	Durometer 70A (Medium)	ASTM D2000	-65° to 300°	Black	10	0000000	000000
3/32	0.103"	2 1/2" to 50"	Durometer 70A (Medium)	ASTM D2000	-65° to 300°	Black	10	0000000	00000
1/8	0.125"	2 1/2" to 50"	Durometer 70A (Medium)	ASTM D2000	-65° to 300°	Black	10	0000000	00000
1/8	0.139"	2 1/2" to 50"	Durometer 70A (Medium)	ASTM D2000	-65° to 300°	Black	10	0000000	00000
3/16	0.21"	2 1/2" to 50"	Durometer 70A (Medium)	ASTM D2000	-65° to 300°	Black	10	0000000	00000
1/4	0.25"	2 1/2" to 50"	Durometer 70A (Medium)	ASTM D2000	-65° to 300°	Black	10	0000000	00000
1/4	0.275"	2 1/2" to 50"	Durometer 70A (Medium)	ASTM D2000	-65° to 300°	Black	10	0000000	00000
5/16	0.312"	2 1/2" to 50"	Durometer 70A (Medium)	ASTM D2000	-65° to 300°	Black	10	0000000	00000
3/8	0.375"	2 1/2" to 50"	Durometer 70A (Medium)	ASTM D2000	-65° to 300°	Black	10	0000000	00000

Metric

Wd., mm	ID Range, mm	Hardness	Specifications Met	Temperature Range, °F	Color	Pkg. Qty.		Pkg.
1.5	63.5 to 1,300	Durometer 70A (Medium)	ASTM D2000	-65° to 300°	Black	10	0000000	000000
2	63.5 to 1,300	Durometer 70A (Medium)	ASTM D2000	-65° to 300°	Black	10	0000000	00000
2.5	63.5 to 1,300	Durometer 70A (Medium)	ASTM D2000	-65° to 300°	Black	10	0000000	00000
3	63.5 to 1,300	Durometer 70A (Medium)	ASTM D2000	-65° to 300°	Black	10	0000000	00000
3.5	63.5 to 1,300	Durometer 70A (Medium)	ASTM D2000	-65° to 300°	Black	10	0000000	00000
4	63.5 to 1,300	Durometer 70A (Medium)	ASTM D2000	-65° to 300°	Black	10	0000000	00000
4.5	63.5 to 1,300	Durometer 70A (Medium)	ASTM D2000	-65° to 300°	Black	10	0000000	00000
5	63.5 to 1,300	Durometer 70A (Medium)	ASTM D2000	-65° to 300°	Black	10	0000000	00000
5.5	63.5 to 1,300	Durometer 70A (Medium)	ASTM D2000	-65° to 300°	Black	10	0000000	00000
5.8	63.5 to 1,300	Durometer 70A (Medium)	ASTM D2000	-65° to 300°	Black	10	00000000	00000
6	63.5 to 1,300	Durometer 70A (Medium)	ASTM D2000	-65° to 300°	Black	10	00000000	00000
8	63.5 to 1,300	Durometer 70A (Medium)	ASTM D2000	-65° to 300°	Black	10	00000000	00000

Email Us

About O-Rings

Made-to-Order Oil-Resistant Buna-N O-Rings

Made-to-Order High-Temperature Silicone O-Rings

Made-to-Order Chemical-Resistant Fluoroelastomer O-Rings

Made-to-Order Water- and Steam-Resistant EPDM O-Rings