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90 Durometer Buna-N O-Ring, Inch OD, 1-7/8 Inch ID, 0.14 Inch Width

Description & Features

Designed for demanding industrial applications, this high-quality O-Ring features a robust 90 Durometer Buna-N material, known for its excellent resistance to oils and fuels. With an actual inner diameter of 1.859 inches and an outer diameter of 2.137 inches, it ensures a reliable seal in various hydraulic systems. The nominal dimensions, including a 1/8 inch width, make it an ideal choice for precise installations where performance and durability are critical.

The 90 Durometer Buna-N O-Ring, Inch OD, 1-7/8 Inch ID, 0.14 Inch Width, manufactured by Hercules Sealing Products, is engineered to perform reliably in temperature ranges from -40°F to 240°F. Its compatibility with numerous hydraulic fluids makes it versatile for industrial applications, ensuring long-lasting sealing integrity.

SKU: A-225-90D

Supplier Part Number (MPN): 568-225-90D

Alternate Part Numbers: 2-225 N90, 2-225/N90, 2-225N90, C1CE77

Specifications

Actual I.D. 1.86	Actual O.D. 2.14	Actual Width 0.139 in	Dash Size -225	Brand Hercules Sealing Products	Brand Hercules Sealing Products	Pack Size 1.00	UOM EA	Nominal I.D. (in) 1-7/8	Nominal O.D. 2-1/8	Nominal Width 1/8	Package Qty. 2	Supplier Part Number 568-225-90D	Alternate Part Numbers Alternate Part Number 2-225 N90, Alternate Part Number 2-225/N90, Alternate Part Number 2-225N90, Alternate Part Number 568-225-90D, Alternate Part Number C1CE77	Product Weight 0.01 lbs

Similar Products

Model Number	Dash Size	Nominal I.D. (in)	Nominal O.D.	Nominal Width	Actual I.D.	Actual O.D.	Actual Width	Package Qty.
A-219-90D 90 Durometer Buna-N O-Ring	-219	1-5/16	1-9/16	1/8	1.296	1.574	0.139 in	19
A-012-90D 90 Durometer Buna-N O-Ring	-012	3/8	1/2	1/16	0.364	0.504	0.07 in	34
A-014-90D 90 Durometer Buna-N O-Ring	-014	1/2	5/8	1/16	0.489	0.629	0.07 in	34
A-210-90D 90 Durometer Buna-N O-Ring	-210	3/4	1	1/8	0.734	1.012	0.139 in	25
A-212-90D 90 Durometer Buna-N O-Ring	-212	7/8	1-1/8	1/8	0.859	1.137	0.139 in	25
A-214-90D 90 Durometer Buna-N O-Ring	-214	1	1-1/4	1/8	0.984	1.262	0.139 in	23
A-222-90D 90 Durometer Buna-N O-Ring	-222	1-1/2	1-3/4	1/8	1.484	1.762	0.139 in	19
A-225-90D 90 Durometer Buna-N O-Ring	-225	1-7/8	2-1/8	1/8	1.859	2.137	0.139 in	2

Product Questions & Answers (2)

Question by: Duane P on Oct 19, 2025, 3:02 PM

got a groove cut for a -225 o-ring, is this the same thing or am i off a size

Answer by: Customer Support on Oct 21, 2025, 2:14 PM

Match it up by dash size and dimensions. This is a -225 Buna-N O-ring in 90 durometer with nominal dimensions of 1-7/8 inch ID, 2-1/8 inch OD, and 1/8 inch width. The actual measured size is about 1.859 inch ID, 2.137 inch OD, and 0.139 inch width, so it lines up with a -225 fit.

Question by: Rex R on Jan 14, 2026, 10:11 AM

These rated for oil exposure, or do they break down after a while like cheaper rubber rings tend to do?

Answer by: Customer Support on Jan 15, 2026, 1:41 PM

Buna-N is one of the better elastomers for oil and fuel contact. At 90 durometer, this particular ring is on the firmer side, which helps it hold its shape under pressure rather than extruding or deforming over time. The material handles petroleum-based hydraulic fluids well, so breakdown from oil exposure isn't a concern under normal operating conditions.