Designed for hydraulic cylinder applications, this piston seal from Hercules Sealing Products is made for reliable performance in heavy equipment and industrial machinery.
Answer by: Customer Support on Mar 6, 2026, 8:04 AM
got a cylinder that calls out PSQ-88, is this the right piston seal or am i mixing parts up
Question by: Shane W on Apr 24, 2025, 2:43 PM
If your application references supplier part number PSQ-88, this is the direct-fit replacement. It is the Hercules Sealing Products piston seal with a 5-1/2 inch outer diameter, and it also crosses to MI-08751838 and MINO-00407X25584.
Answer by: Customer Support on Apr 25, 2025, 9:36 PM
Got a cylinder with a 5-1/2 inch bore that needs a new piston seal. This the right part to be lookin at?
Question by: Lance C on Sep 14, 2025, 6:50 PM
For a 5-1/2 inch outer diameter piston seal, yes, this is the one. The PSQ-88 is built specifically for that bore size and comes from Hercules Sealing Products, which has a solid reputation in fluid power applications. It also cross-references under part numbers MI-08751838 and MINO-00407X25584, so if you've got old paperwork or a parts list with either of those numbers, you're looking at the same seal.
Answer by: Customer Support on Sep 16, 2025, 5:56 PM
