Airtac STA Single Acting Compact Guided Cylinder STA50X25B
The AirTAC Airtac STA Single Acting Compact Guided Cylinder STA50X25B is a genuine single-acting COMPACT cylinder (single acting, pull type) with a Ø50mm bore and 25mm stroke. Air pulles the rod and an internal spring returns it, so one solenoid line drives the motion — ideal for short-stroke clamping and ejection in tight spaces.
- BoreØ50 mm
- Stroke25 mm
- Port sizePT1/4
- Acting typeSingle acting, pull type
- Rod threadM10×1.5 (F) / M18×1.5 (B)
- CushionFixed NBR bumper
About the Airtac STA Single Acting Compact Guided Cylinder STA50X25B
The AirTAC STA50X25B is a compact single-acting pull-type cylinder where compressed air retracts the 20 mm piston rod and an internal spring pushes it back out. It generates 717.7 N of net pull at 0.5 MPa, with the return spring force already subtracted from the theoretical pneumatic value. This makes it inherently fail-safe to the extended position upon loss of air pressure.
Designed for tight envelopes, the short riveted body saves axial mounting depth where a standard round-body cylinder will not fit. This specific SKU features a male M18x1.5 rod-end thread and a PT1/4 port. It lacks a piston magnet, so position sensing is not supported out of the box. A fixed NBR bumper decelerates the stroke end, operating effectively between 50 and 500 mm/s.
Airtac STA Single Acting Compact Guided Cylinder STA50X25B Technical Specifications
| Model | Airtac STA Single Acting Compact Guided Cylinder STA50X25B |
|---|---|
| Series | STA compact single-acting cylinder |
| Bore size | Ø50 mm |
| Stroke | 25 mm |
| Acting type | Single acting, pull type |
| Port size | PT1/4 |
| Rod end thread | M10×1.5 female / M18×1.5 male (B) |
| Fluid | Air (filtered by 40µm element) |
|---|---|
| Operating pressure | 0.2 – 1.0 MPa |
| Proof pressure | 1.5 MPa |
| Temperature | -20 to +70 °C |
| Speed range | 50 – 500 mm/s |
| Cushion | Fixed NBR bumper |
| Max standard stroke | Up to 30 mm |
Specifications follow the official AirTAC SDA-family datasheet. Single-acting types start at 0.2 MPa (the spring must be overcome). Confirm against the product label before installation.
Net Output Force (Ø50mm, Pull)
| Pressure | Pull force (net) |
|---|---|
| 0.5 MPa | 718 N |
| 0.7 MPa | 1048 N |
These are NET output forces — the return-spring force is already deducted. Single-acting pull only; the spring performs the opposite stroke. Size with a safety margin.
Model Code: Airtac STA Single Acting Compact Guided Cylinder STA50X25B
| STA | Compact single acting, pull type cylinder series. |
|---|---|
| 50 | Bore size in mm. |
| ×25 | Stroke length in mm (single-acting max 30 mm). |
| S | Built-in magnet for magnetic-switch sensing (omit = none). |
| B | Male-thread piston rod (omit = female thread). |
Thread: PT standard. SSA pushes out / spring returns; STA pulls in / spring extends. Related: SDA (double acting), SDAD (double rod), SDAJ (adjustable stroke).
Where the Airtac STA Single Acting Compact Guided Cylinder STA50X25B Is Used
Tensioning Systems
Uses the 717.7 N net pull to draw tension cables tight, relying on the spring to slacken the line safely when air pressure drops.
Hold-Down Clamps
Pulls a workpiece firmly against a fixture via the male M18x1.5 rod, releasing the clamp automatically to the extended position on air loss.
Gate Return Mechanisms
Holds a diverter gate open pneumatically while the internal spring forces the gate closed, ideal for compact sorting lanes.
Is the Airtac STA Single Acting Compact Guided Cylinder STA50X25B the Right Cylinder?
When sizing this 50 mm bore, compare its 717.7 N net pull at 0.5 MPa against adjacent bores. Stepping down, the STA40 provides 445.1 N, while stepping up, the STA63 yields 1225.5 N. Based on the 717.7 N figure, a safe working load is approximately 431 N (60 percent margin), translating to a vertical lift capacity of about 36.6 kg with a 2:1 safety factor.
This model has a 25 mm stroke, well within the 30 mm maximum standard limit for the series. Remember that the internal spring drives the rod out when air is removed, meaning it cannot hold a mid-stroke load without live pressure or an external locking device. Confirm your requirements for the PT1/4 port, the male M18x1.5 rod thread, and the lack of an -S magnet for sensing.
Quick checklist
- ✓ Net pull force at your working pressure
- ✓ Stroke ≤ 30 mm (single-acting limit)
- ✓ Single air line saves a valve/port
- ✓ Magnet (S) for sensors?
- ✓ Female (blank) or male (B) rod thread
Installation & Maintenance Notes
- check Use clean air filtered to 40µm or finer.
- check Keep within 0.2 – 1.0 MPa operating pressure.
- check Remember the spring performs the return stroke.
- check Avoid side load on the short piston rod.
- check Front/rear covers are riveted — do not dismantle.
- check Installation by qualified personnel per AirTAC docs.
Airtac STA Single Acting Compact Guided Cylinder STA50X25B FAQ
The STA50X25B provides a net pull force of 717.7 N at 0.5 MPa and 1047.5 N at 0.7 MPa. These figures already account for the opposing force of the internal return spring.
No. As a single-acting pull cylinder, air retracts the rod and the spring extends it. If air is lost, the spring drives the rod to the extended rest position. It requires at least 0.2 MPa to overcome the spring and cannot lock a load mid-stroke without external devices.
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