Designed for sealing applications in hydraulic and industrial equipment, this O-ring from Hercules Sealing Products features an outer diameter of 4-3/8 inches and a cross-section width of 3/16 inches. The HERCULES ORING OD 4-3/8 W 3/16 is suited for use in cylinders, fittings, and other fluid power components where a reliable static or dynamic seal is required at this size range.
Hercules Sealing Products is a recognized supplier of sealing components across industrial and hydraulic markets. This O-ring is available under several alternate part numbers, supporting cross-referencing from other manufacturers or procurement systems.
SKU: A-345-HERCULES
Supplier Part Number (MPN): 568-345
Alternate Part Numbers: C1CF87, MI-08740524, MINO-00407X21591
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Specifications
Alternate Part Numbers
Alternate Part NumberC1CF87, Alternate Part Number MI-08740524, Alternate Part Number MINO-00407X21591
Brand
Hercules Sealing Products
Brand
Hercules Sealing Products
Pack Size
1.00
UOM
EA
Supplier Part Number
568-345
Product Weight
0.03 lbs
Product Questions & Answers (3)
Question by: Steve D on Jul 20, 2025, 8:03 AM
got a cylinder gland that takes an o-ring around 4-3/8 OD and 3/16 thick, is this the right size or am i readin it wrong
Answer by: Customer Support on Jul 22, 2025, 6:09 AM
Outer diameter and cross-section are the two key callouts on this one. It is a Hercules O-ring with a 4-3/8 inch OD and a 3/16 inch cross-section width, so it matches what you described if your seal spec is based on those two dimensions.
Question by: Clint S on Feb 3, 2026, 10:23 AM
got a cylinder that takes a 4-3/8 inch OD o-ring with a 3/16 cross section, does this Hercules one match up to that?
Answer by: Customer Support on Feb 5, 2026, 6:37 AM
That's what this one is sized for. The outer diameter is 4-3/8 inches and the cross-section width is 3/16 inches, so if your cylinder calls for those dimensions, you're looking at the right part. Hercules Sealing Products makes these for hydraulic and fluid power applications, cylinders included.
Question by: Rusty B on Dec 3, 2025, 8:46 PM
Hey, will this here O-ring work alright in a hydraulic cylinder? Just need to make sure it's the right size.
Answer by: Customer Support on Dec 5, 2025, 6:13 AM
Based on the specs, this Hercules O-ring has an outer diameter of 4-3/8 inches and a width of 3/16 inches. So, if those dimensions match what you need for your cylinder, it should be a good fit.
