The Enerpac CST40381 is a single-acting, spring-return threaded body cylinder from the CST series, rated 8,800 lb at 5,000 psi with a 1.56 in stroke. Its 1.875-16 UN body thread lets you screw it straight into a fixture or bracket and set the plunger height exactly, which makes it a compact choice for positioning, holding and ejecting parts where space is tight.
Features
- Threaded body for exact positioning and easy installation
- Center-tapped plunger (.500-13 UNC) holds contact buttons and other attachments
- Spring return keeps tubing simple: one hydraulic line per cylinder
- SAE #4 oil port
- Buna-N and polyurethane seals
Sizing
Effective area is 1.76 in² and a full stroke uses 2.63 in³ of oil. The CST40381 is 4.93 in long retracted and 6.49 in extended and weighs 3.3 lb. Workholding circuits often run below 5,000 psi; at 2,000 psi this cylinder gives about 3,520 lb of force and at 3,000 psi about 5,280 lb.
How it compares
Other CST cylinders with the same 1.875-16 UN body: CST40131 (0.58 in stroke), CST40251 (1.05 in stroke), CST40501 (2.03 in stroke).
If you need powered retraction or high cycle rates, the double-acting CDT series covers the same force class (for example CDT40131).
Before you order: The return spring needs at least 580 psi to overcome, so set your circuit above that; use a 3-way valve or a single-acting workholding circuit; mounting flanges and flange nuts for the 1.875-16 UN thread are sold separately.
Related models
| Model | Force | Stroke | Body thread |
|---|---|---|---|
| CST40131 | 8,800 lb | 0.58 in | 1.875-16 UN |
| CST40251 | 8,800 lb | 1.05 in | 1.875-16 UN |
| CST40501 | 8,800 lb | 2.03 in | 1.875-16 UN |
Specifications
| Product Family | Hydraulic Workholding Cylinders |
|---|---|
| Series | CST |
| Cylinder Type | Threaded Body Hydraulic Cylinders |
| Stroke | 1.56 in |
| Push Force | 8,800 lb |
| Cylinder Stroke | 1.56 in |
| Maximum Operating Pressure | 5,000 psi |
| Cylinder Action | Single Acting |
| Return Type | Spring Return |
| Capacity Range | Up to 5 Ton |
| Collapsed Height | 4.93 in |
| Weight | 3.3 lb |