Airtac STA Single Acting Compact Guided Cylinder STA40X25S
The AirTAC Airtac STA Single Acting Compact Guided Cylinder STA40X25S is a genuine single-acting COMPACT cylinder (single acting, pull type) with a Ø40mm 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.
- BoreØ40 mm
- Stroke25 mm
- Port sizePT1/8
- Acting typeSingle acting, pull type
- Rod threadM8×1.25 (F) / M14×1.5 (B)
- CushionFixed NBR bumper
About the Airtac STA Single Acting Compact Guided Cylinder STA40X25S
The AirTAC STA40X25S is a compact single-acting pull-type cylinder where air retracts the rod and an internal spring extends it. It provides 445.1 N of net pull at 0.5 MPa, making it highly effective for tensioning and hold-down operations. The short riveted body saves valuable axial mounting depth where standard round-body cylinders cannot fit.
This unit includes a built-in magnet for position sensing. It operates on a single air line and solenoid port, while the fixed NBR bumper decelerates the stroke end without acting as an adjustable lock.
Airtac STA Single Acting Compact Guided Cylinder STA40X25S Technical Specifications
| Model | Airtac STA Single Acting Compact Guided Cylinder STA40X25S |
|---|---|
| Series | STA compact single-acting cylinder |
| Bore size | Ø40 mm |
| Stroke | 25 mm |
| Acting type | Single acting, pull type |
| Port size | PT1/8 |
| Rod end thread | M8×1.25 female / M14×1.5 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 (Ø40mm, Pull)
| Pressure | Pull force (net) |
|---|---|
| 0.5 MPa | 445 N |
| 0.7 MPa | 656 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 STA40X25S
| STA | Compact single acting, pull type cylinder series. |
|---|---|
| 40 | 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 STA40X25S Is Used
Clamp Retraction
Pulls a machining clamp back against spring pressure to release finished parts safely.
Gate Tensioning
Holds a diverter gate tensioned during transit and releases it when air is applied.
Lid Hold-Down
Maintains downward pressure on a packaging lid and retracts to allow product loading.
Is the Airtac STA Single Acting Compact Guided Cylinder STA40X25S the Right Cylinder?
When sizing this 40 mm bore, note the STA32 yields 290.1 N and the STA50 yields 717.7 N net pull at 0.5 MPa. This model provides a safe working load of roughly 267 N, or a vertical lift capacity of about 22.7 kg with a 2:1 safety margin. The 25 mm stroke respects the 30 mm maximum limit for this series.
Confirm the PT1/8 port and the 16 mm rod. Because the spring drives the rod out upon air loss, it will not hold a mid-stroke load without an external device. The -S suffix indicates a built-in magnet compatible with AirTAC reed or electronic switches, and the female M8x1.25 rod thread is standard.
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 STA40X25S FAQ
The net pull force is 445.1 N at 0.5 MPa and 656.2 N at 0.7 MPa. These figures already account for the internal return spring, so you can size directly to these values.
It requires at least 0.2 MPa to overcome the spring and retract the rod. If air pressure is lost, the spring extends the rod to its resting position; it cannot hold a mid-stroke load without an external locking device.
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