The shaft has internal return spring with bottom bolt. They use chinese made seals which do not last very long, we USE JAPANESE made seals that are very good quality and expensive. 10 TON 10 INCH STROKE HYDRAULIC RAM AUTO BODY FRAME MACHINE.   

   Universal Heavy Duty Log Splitter Hydraulic Cylinder 4x24 Stroke, Double Acting. Log Splitter Hydraulic Cylinder 4" Bore x 24" Stroke x 1.75 Rod - Double Acting Hydraulic Cylinder - Universal Heavy Duty Hydraulic Cylinder 4x24. Log Splitter Hydraulic Cylinder is designed for use on 22-25 Ton Log Splitters, compatible with Dirty Hand Tools, Tractor Supply Co (TSC), CountyLine, Huskee, MTD, Oregon, SpeeCo & SplitMaster Log Splitters. Universal Hydraulic Cylinder 4 Bore 24 inch Stroke. Wood Splitting Double Acting Cylinder works on many wood splitting applications, and fits in ...

10 Ton 6 Stroke Ram with FREE 1/4 Male & Female Coupler. Collar Thread Spec: D2.24-14. Threaded Top & Base: 1¼"-11½" NPT.   

50 Tons Hydraulic Cylinder Jack Single Acting 6 inch Stroke Solid Jack Ram 150mm. This is a new 50Ton Hydraulic Cylinder. Chromium Plated Surface of Piston. Prolonging the service life of piston. Plunger Has the Function to Retracting Automatically. In order to operate correctly, all oil cylinders need to be connected with solid and flat surfaces. For example, using thin oil cylinders in sandy soil or loose surfaces will cause damage to the oil cylinders. Due to the different display and different light, the picture may not reflect the actual color of the item.   

This heavy-duty hydraulic tie-rod cylinder is made by Cross, a trusted brand in the industry. With a 3" bore and 12" stroke, this cylinder is perfect for a variety of industrial applications. Designed with tie-rod construction, it provides strength and durability to ensure reliable performance. Ideal for use in hydraulics, pneumatics, pumps, and plumbing, this cylinder is a great addition to any business or industrial setting. It is easy to install and maintain, and its high-quality construction ensures a long service life. If you're looking for a reliable hydraulic cylinder that gets the ...

   - Made of heavy-duty metal construction, our hydraulic cylinder jack is durable and designed for long-lasting use. Paint spraying at the surface, prevent scratching and corrosion. - Our ram hydraulic cylinder is designed to provide reliable support during operation. No stuck when lifting, large 30 T/66000 LBS tonnage, enough stroke(50 mm/2 inch). - Quick connecting head with dust cover, preventing the jack's inside from dust, features the firm connection with no leakage. Compact structure for easy operation. - The hydraulic ram cylinder features a smooth surface with circle ...

I'd imagine they're well over 20 ton.   

   Heavy Duty Double Acting Hydraulic Log Splitter Cylinder 4.5" Bore x 24" Stroke. Hydraulic Log Splitter Cylinder 4.5" Bore x 24" Stroke x 1.75 Rod. Heavy Duty Double Acting Hydraulic Cylinder. Clevis Style Mount Universal Hydraulic Cylinder. Log Splitter Hydraulic Cylinder is designed for use on Log Splitters, compatible with Dirty Hand Tools, Tractor Supply Co (TSC), CountyLine, Huskee, MTD, Oregon, SpeeCo & SplitMaster Log Splitters. Wood Splitting Double Acting Cylinder works on many wood splitting applications and fits in different types of log splitting equipment ...