The Enerpac CST18381 is a single-acting, spring-return threaded body cylinder from the CST series, rated 3,950 lb at 5,000 psi with a 1.49 in stroke. Its 1.313-16 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 (.313-24 UNF) 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 0.79 in² and a full stroke uses 1.18 in³ of oil. The CST18381 is 4.27 in long retracted and 5.76 in extended and weighs 1.5 lb. Workholding circuits often run below 5,000 psi; at 2,000 psi this cylinder gives about 1,580 lb of force and at 3,000 psi about 2,370 lb.
How it compares
Other CST cylinders with the same 1.313-16 UN body: CST18131 (0.51 in stroke), CST18251 (0.98 in stroke), CST18501 (1.97 in stroke).
If you need powered retraction or high cycle rates, the double-acting CDT series covers the same force class (for example CDT18131).
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 1.313-16 UN thread are sold separately.
Related models
| Model | Force | Stroke | Body thread |
|---|---|---|---|
| CST18131 | 3,950 lb | 0.51 in | 1.313-16 UN |
| CST18251 | 3,950 lb | 0.98 in | 1.313-16 UN |
| CST18501 | 3,950 lb | 1.97 in | 1.313-16 UN |
| CST27151 | 6,110 lb | 0.59 in | 1.625-16 UN |
Specifications
| Product Family | Hydraulic Workholding Cylinders |
|---|---|
| Series | CST |
| Cylinder Type | Threaded Body Hydraulic Cylinders |
| Stroke | 1.49 in |
| Push Force | 3,950 lb |
| Cylinder Stroke | 1.49 in |
| Maximum Operating Pressure | 5,000 psi |
| Cylinder Action | Single Acting |
| Return Type | Spring Return |
| Capacity Range | Up to 5 Ton |
| Collapsed Height | 4.27 in |
| Weight | 1.5 lb |