Dash Number 052 O-Rings | McMaster-Carr

Made of Buna-N, these O-rings resist grease, hydraulic oil, and motor oil—plus mild chemicals and water. However, Buna-N is not for use with brake fluid. These O-rings are commonly used to create multidirectional seals between two parts in power transmission assemblies, hydraulic cylinders, and pneumatic cylinders. They resist compression and tearing to keep their shape over time. All have shelf life, a cure date, and a traceable lot number printed on the package.

Inch

	Fractional		Actual								Pkg.
Dash Number	ID	OD	ID	OD	Hardness	Specifications Met	Temperature Range, °F	Color	Pkg. Qty.		1-9	10-49	50-Up
Wd.: 1/16 Fractional (0.07" Actual)
052	5 3/4	5 7/8	5.739"	5.879"	Durometer 70A (Medium)	ASTM D2000, SAE AS568, SAE J200	-30° to 215°	Black	2	9452K302	00000	00000	00000

Chemical-Resistant Viton® Fluoroelastomer O-Rings

Black

Brown

Made of Viton® fluoroelastomer, these O-rings combine the oil resistance of Buna-N with the heat tolerance of silicone. They also resist a variety of chemicals, including benzene, butyl alcohol, and ethylene glycol. They’re often used to seal hydraulic systems and equipment in crude oil refineries. All have shelf life, a cure date, and a traceable lot number printed on the bag.

Brown O-rings help you tell Viton® fluoroelastomer apart from other materials.

Inch (1/32 to 1/16 Wide)

	Fractional		Actual								Pkg.
Dash Number	ID	OD	ID	OD	Hardness	Specifications Met	Temperature Range, °F	Choose a Color	Pkg. Qty.		1-9	10-49	50-Up
Wd.: 1/16 Fractional (0.07" Actual)
052	5 3/4	5 7/8	5.739"	5.879"	Durometer 75A (Medium)	ASTM D2000, SAE AS568, SAE J200	0° to 400°	Black, Brown	1	9464K796	00000	00000	00000

High-Temperature Soft Silicone O-Rings

Easier to compress than standard silicone O-rings, these O-rings create a better seal in enclosures, reservoirs, and other low-pressure equipment. They can withstand temperatures up to 400° F. All have shelf life, a cure date, and a traceable lot number printed on the bag.

Inch

	Fractional		Actual								Pkg.
Dash Number	ID	OD	ID	OD	Hardness	Specifications Met	Temperature Range, °F	Color	Pkg. Qty.		1-9	10-Up
Wd.: 1/16 Fractional (0.07" Actual)
052	5 3/4	5 7/8	5.739"	5.879"	Durometer 50A (Soft)	ASTM D2000, SAE AS568	-65° to 435°	Red	1	1173N32	00000	00000

High-Temperature Parker S1138 Silicone O-Rings

Use these O-rings in temperatures up to 400° F. Made of Parker S1138 silicone, they’re pure enough for food or pharmaceutical applications—they’re USP VI certified. These O-rings are also FDA compliant for direct contact with food. All come with a cure date and a traceable lot number printed on the bag.

	Fractional		Actual								Pkg.
Dash Number	ID	OD	ID	OD	Hardness	Specifications Met	Temperature Range, °F	Color	Pkg. Qty.		1-9	10-49	50-Up
Wd.: 1/16 Fractional (0.07" Actual)
052	5 3/4	5 7/8	5.739"	5.879"	Durometer 70A (Medium)	ASTM D2000, FDA Compliant 21 CFR 177.2600, SAE J200, USP VI Certified	-60° to 400°	Red	1	9396K942	00000	00000	00000

High-Temperature Silicone O-Rings

Made of silicone, these O-rings can withstand temperatures up to 400° F or higher. They're FDA compliant for direct contact with food, so they're often used on hot food lines. They're also used to seal HVAC systems. All come with a cure date and a traceable lot number printed on the bag.

Inch

	Fractional		Actual								Pkg.
Dash Number	ID	OD	ID	OD	Hardness	Specifications Met	Temperature Range, °F	Color	Pkg. Qty.		1-9	10-49	50-Up
Wd.: 1/16 Fractional (0.07" Actual)
052	5 3/4	5 7/8	5.739"	5.879"	Durometer 70A (Medium)	ASTM D2000, FDA Compliant 21 CFR 177.2600, SAE AS568, SAE J200	-65° to 400°	Red	2	9186N163	00000	00000	00000

Water- and Steam-Resistant EPDM O-Rings

Made of EPDM, these O-rings have excellent resistance to water, steam, and glycol-based fluids, including brake fluid. They’re often used to seal plumbing and refrigeration systems, since they won’t swell or break down in moist environments. All have shelf life, a cure date, and a traceable lot number printed on the bag.

Inch

	Fractional		Actual								Pkg.
Dash Number	ID	OD	ID	OD	Hardness	Specifications Met	Temperature Range, °F	Color	Pkg. Qty.		1-9	10-49	50-Up
Wd.: 1/16 Fractional (0.07" Actual)
052	5 3/4	5 7/8	5.739"	5.879"	Durometer 70A (Medium)	ASTM D2000, SAE AS568, SAE J200	-65° to 300°	Black	5	8785N112	00000	00000	00000