Airtac STA Single Acting Compact Guided Cylinder STA50X25SB
The AirTAC Airtac STA Single Acting Compact Guided Cylinder STA50X25SB 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 STA50X25SB
The AirTAC STA50X25SB is a compact single-acting pull-type cylinder where air retracts the piston and an internal spring extends it out at rest. It provides 717.7 N of net pull at 0.5 MPa, reaching 1047.5 N at 0.7 MPa. The short riveted body saves axial mounting depth where a round-body or profile cylinder will not fit.
This specific configuration includes a built-in piston magnet for AirTAC reed or electronic switches and a male M18x1.5 rod thread. A fixed NBR bumper decelerates the stroke end, but it does not function as an adjustable air cushion or a locking brake.
Airtac STA Single Acting Compact Guided Cylinder STA50X25SB Technical Specifications
| Model | Airtac STA Single Acting Compact Guided Cylinder STA50X25SB |
|---|---|
| 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 STA50X25SB
| 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 STA50X25SB Is Used
Tensioning Systems
Uses the 717.7 N net pull to maintain consistent tension on belts or wire feeds, with the spring safely extending the rod when air is removed.
Pallet Hold-Down
Pulls a securing pin or strap tight against heavy pallet loads during transit, relying on the male M18x1.5 thread for a robust mechanical connection.
Flap Folding
Retracts to pull packaging flaps into position before taping, taking advantage of the compact riveted body to fit within tight conveyor frames.
Is the Airtac STA Single Acting Compact Guided Cylinder STA50X25SB the Right Cylinder?
When sizing this unit, compare its 717.7 N net pull at 0.5 MPa against adjacent bores: the STA40 yields 445.1 N, while the STA63 provides 1225.5 N. A practical safe working load is roughly 431 N, allowing a vertical lift of about 36.6 kg with a 2:1 safety margin.
Remember the 30 mm maximum standard stroke ceiling and the spring-extend behavior: on air loss, the spring drives the rod out, so it cannot hold a mid-stroke load without an external rod lock. This model features a 50 mm bore, 25 mm stroke, PT1/4 port, an -S magnet, and a male M18x1.5 rod thread.
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 STA50X25SB FAQ
The net pull force is 717.7 N at 0.5 MPa and 1047.5 N at 0.7 MPa. These figures already account for the internal return spring, meaning the spring force is already subtracted from the pneumatic pull.
Air pressure retracts the rod, requiring at least 0.2 MPa to overcome the internal spring. When air is released, the spring extends the rod back out. It does not hold a mid-stroke load without live pressure or an external locking device.
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