CST series cylinders
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CST series linear cylinders
Enerpac offers the most complete line of linear cylinders – from compact short-stroke spring-return cylinders to heavy-duty double-acting automatic cylinders. Whether you need to push, pull, clamp, strike, stamp, press or hold in place for days, Enerpac has the right linear cylinder in its range.
Enerpac CST series hydraulic cylinders – 350 bar threaded body workholding cylinders
Enerpac CST series hydraulic cylinders (single-acting threaded body workholding cylinders with spring return, Eng. Enerpac Threaded Body Cylinders) are compact hydraulic power devices designed for precise positioning, clamping and holding of workpieces in welding fixtures, machining fixtures and on CNC machine tables and presses. The fully threaded body (standard metric threads, e.g. M16, M28, M48) allows the cylinder to be screwed directly into a mounting plate, a threaded hole in the fixture body or for its height to be precisely set using locknuts. CST series cylinders operate at a maximum working pressure of up to 350 bar (35 MPa), generating very high clamping forces (from 1,7 kN to over 39 kN) while maintaining a minimum outer diameter. Single-acting with spring return significantly simplifies plumbing. Equipping the plunger with an internal wiper seal protects the mechanism from metal chips, dust and coolant, ensuring maintenance-free and repeatable operation for hundreds of thousands of work cycles.
Application and technical characteristics of Enerpac CST series cylinders
Enerpac CST threaded workholding cylinders are commonly used in industrial process automation, assembly lines and in technological tooling for machine tools. Their small-scale design allows for a dense arrangement of clamping points on a small mounting surface.
- Threaded Body: The external thread on the entire actuator housing allows for easy screwing into threaded plates or precise adjustment of the working position using locknuts.
- Maximum working pressure up to 350 bar: Ensures the generation of high clamping forces (from 1,7 kN in CST272 models to 39,2 kN in CST40132 models) with minimal overall dimensions.
- Spring return (single-acting): The built-in internal return spring quickly retracts the piston after the pressure is released, which simplifies the power system to a single hydraulic line.
- Internal wiper seal (Wiper Seal): Protects the inside of the cylinder from coolant, dust and machining chips, allowing for maintenance-free operation in harsh conditions.
- Threaded hole in the piston: Enables stable mounting of replaceable pressure pads and contact buttons matched to the shape of the clamped detail.
Why choose Enerpac CST series cylinders in the HYDRON store?
As an authorized distributor of Enerpac solutions, the HYDRON store guarantees access to original, reliable CST series cylinders manufactured according to the highest quality standards. Correct selection of threaded cylinders allows for significantly shortening the time for clamping workpieces in machining holders and eliminating material deformation. For safety reasons and to ensure maximum seal life, it is recommended to operate the devices at loads not exceeding 80% of the rated values. To build a complete and efficient clamping station, we recommend selecting other compatible products from our offer, such as original Enerpac tools and cylinders, efficient hydraulic power pumps, flexible hydraulic lines and hoses and leak-free hydraulic quick couplers.
Technical specification
Technical parameter | Value / Description |
|---|---|
Product category | Enerpac CST series hydraulic cylinders (threaded workholding cylinders) |
Action and return type | Single-acting with spring return (Spring Return) |
Maximum working pressure | 350 bar (35 MPa / 5 000 PSI) |
Range of clamping / lifting forces | from 1,7 kN to 39,2 kN (depending on model) |
Piston stroke range | from 7,3 mm to 25 mm |
Housing (body) thread | External metric (e.g. M16x1,5, M28x1,5, M48x1,5) |
Pad mounting socket | Internal thread in the piston (e.g. M4x0,7, M6x1,0, M10x1,5) |
Protection against contamination | Built-in piston wiper ring (plunger wiper) |
Frequently Asked Questions (FAQ)
What are Enerpac CST series hydraulic cylinders used for?
CST series cylinders are used for precise positioning, clamping and establishing the position of workpieces in welding fixtures, machining holders on CNC machine tools and on industrial presses.
What are the advantages of a threaded body in Enerpac CST cylinders?
The threaded body allows the cylinder to be screwed directly into a threaded hole in a machining fixture plate. This enables smooth adjustment of the stroke height and maximum reduction of the dimensions of the clamping zone.
Do CST series cylinders require the connection of two pressure lines?
No. Enerpac CST cylinders are single-acting designs with spring return. Piston retraction occurs automatically after the pressure is cut off, which means they require only one hydraulic line to operate.
Why is a piston wiper used in CST cylinders?
The wiper protects the internal seals from the penetration of coolants, oils and sharp steel chips generated during machining, which drastically extends the life of the cylinder.