HERCULES HYDRAULICS ORING 568-425

Specifications

Actual I.D. 4.48 Inch	Actual O.D. 5.03 Inch	Actual Width 0.28 Inch	Alternate Part Numbers Alternate Part Number A-425, Alternate Part Number C1CG49, Alternate Part Number MI-08740583, Alternate Part Number MINO-00407X21612	Brand Hercules Sealing Products	Brand Hercules Sealing Products	Pack Size 1.00	UOM EA	Nominal I.D. (in) 4-1/2	Nominal O.D. 5	Nominal Width 1/4	Supplier Part Number 568-425	Product Weight 0.04 lbs

Product Questions & Answers 4

Product Questions & Answers

does the 568-425 come in buna-n or is it something else? need to know before i order a handful of these

Question by: Norm B on Nov 17, 2025, 1:45 PM

Buna-N is exactly what you're getting here, 70 durometer. That's a pretty standard hardness for hydraulic sealing applications, firm enough to hold up under pressure without being too stiff to seat properly.

Answer by: Customer Support on Nov 19, 2025, 6:32 AM

What's the inside and outside diameter on this o-ring? Just want to make sure it'll fit my cylinder right.

Question by: Merle R on Jan 9, 2026, 12:20 PM

It measures 4.48 inches on the inside diameter and 5.03 inches on the outside. The width is 0.28 inches.

Answer by: Customer Support on Jan 11, 2026, 8:08 AM

got an o-ring groove that’s right around 4-1/2 inch on the inside, is this the one that matches?

Question by: Judy W on Jul 24, 2025, 9:36 AM

This one is a 70 durometer Buna-N O-ring with a nominal inside diameter of 4-1/2 inches. The actual measured ID is 4.48 inches, with an actual OD of 5.03 inches and an actual width of 0.28 inches.

Answer by: Customer Support on Jul 26, 2025, 6:14 AM

Will this O-ring fit where I need a 4 1/2 inch ID and 5 inch OD?

Question by: Dustin S on May 25, 2025, 6:16 PM

It is designed for use in applications needing a nominal inner diameter of 4-1/2 inches and a nominal outer diameter of 5 inches, matching your stated requirements.

Answer by: Customer Support on May 26, 2025, 8:59 PM