Enerpac RWH121 Hollow Plunger Hydraulic Cylinder

Product Description

The ENERPAC RWH121 is a single-acting, hollow-plunger hydraulic cylinder built for portable lifting, pushing, and pressing applications in industrial and maintenance environments. Part of the RWH series, it features a steel body and a hollow plunger design that allows technicians to route threaded rod, cables, or sensing equipment through the center of the cylinder during operation. Key specifications include a 2.76 cubic inch oil capacity, a 1.38-inch rod diameter, and a 3/4-16 internal plunger thread. This cylinder is installed and serviced by maintenance technicians, millwrights, and hydraulic system specialists working in production, construction, or heavy equipment service settings.

The RWH121 is suited for applications where a through-hole cylinder geometry is required, such as post-tensioning, bolt tensioning, nut splitting assistance, or any task where a threaded rod must pass through the ram centerline. The hollow plunger configuration makes this cylinder a common choice in controlled-force applications across industrial plants, fabrication shops, and field maintenance operations where compact cylinder height and pass-through capability are both essential requirements.

Key Features

• Single-acting design returns under load or spring, simplifying circuit requirements
• Hollow plunger allows pass-through of threaded rod, cable, or instrumentation
• 2.76 cubic inch oil capacity supports controlled, precise stroke volume
• 1.38-inch rod diameter with 3/4-16 internal thread for direct load attachment
• 2-3/4 - 16 collar thread for secure fixture or accessory mounting
• Steel body construction for durability in demanding service environments
• Compact lowered height of 3.22 inches with maximum extended height of 4.24 inches

Compatibility

Designed as an OEM-style replacement or service cylinder within the ENERPAC RWH series hydraulic cylinder line. Confirm system operating pressure and port connections match before installation.

Installation Notes

Installation should be performed by a qualified hydraulic technician or millwright familiar with high-pressure hydraulic systems. Relieve all hydraulic pressure in the circuit before disconnecting or installing the cylinder. Ensure port fittings are rated for the system operating pressure and that all connections are leak-free before applying load. Follow applicable workplace safety standards and equipment manufacturer guidelines throughout the procedure.