Airtac STA Single Acting Compact Guided Cylinder STA20X25B
The AirTAC Airtac STA Single Acting Compact Guided Cylinder STA20X25B is a genuine single-acting COMPACT cylinder (single acting, pull type) with a Ø20mm 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.
- BoreØ20 mm
- Stroke25 mm
- Port sizeM5×0.8
- Acting typeSingle acting, pull type
- Rod threadM4×0.7 (F) / M6×1.0 (B)
- CushionFixed NBR bumper
About the Airtac STA Single Acting Compact Guided Cylinder STA20X25B
The AirTAC STA20X25B is a compact single-acting pull-type cylinder where compressed air retracts the 8 mm rod and an internal spring pushes it back out. It generates 108.9 N of net pull at 0.5 MPa, safely handling a working load of roughly 65 N or lifting about 5.6 kg vertically with a 2:1 margin. This fail-safe design extends to its resting state automatically if air pressure drops.
The short riveted body drastically cuts axial mounting depth compared to round-body alternatives, fitting easily into cramped machinery. This specific SKU features a male M6x1.0 piston rod thread for straightforward load coupling. Because it lacks the -S magnet option, it cannot accept reed or electronic switches. End-of-stroke deceleration is handled strictly by a fixed NBR bumper, not an adjustable air cushion.
Airtac STA Single Acting Compact Guided Cylinder STA20X25B Technical Specifications
| Model | Airtac STA Single Acting Compact Guided Cylinder STA20X25B |
|---|---|
| Series | STA compact single-acting cylinder |
| Bore size | Ø20 mm |
| Stroke | 25 mm |
| Acting type | Single acting, pull type |
| Port size | M5×0.8 |
| Rod end thread | M4×0.7 female / M6×1.0 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 (Ø20mm, Pull)
| Pressure | Pull force (net) |
|---|---|
| 0.5 MPa | 109 N |
| 0.7 MPa | 162 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 STA20X25B
| STA | Compact single acting, pull type cylinder series. |
|---|---|
| 20 | 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 STA20X25B Is Used
Tension Gate Retraction
Uses the 108.9 N net pull to draw a diverter gate back against a hard stop on a packaging line, letting the internal spring push it open when air is cut.
Film Roll Hold-Down
Pulls a tensioning arm inward to secure wrapping material, taking advantage of the compact 25 mm stroke and male M6x1.0 rod end for easy mounting.
Component Ejection Return
Retracts a spring-loaded plunger on an assembly fixture to release a finished part, relying on the fixed NBR bumper to absorb the end shock.
Is the Airtac STA Single Acting Compact Guided Cylinder STA20X25B the Right Cylinder?
When sizing this unit, verify the 20 mm bore and 25 mm stroke fit your spatial limits while respecting the 30 mm maximum standard stroke ceiling. If your tensioning task requires less force, the STA16 bore provides 66.4 N of net pull at 0.5 MPa. For heavier pulling, stepping up to the STA25 yields 177.7 N at the same pressure. This model requires a minimum operating pressure of 0.2 MPa to overcome the return spring and operates up to 1.0 MPa.
Confirm the 25 mm stroke, M5x0.8 air port, and the male M6x1.0 rod thread (designated by the B option) match your mechanical interface. Keep in mind the spring-extend behavior: the STA20X25B cannot hold a mid-stroke load without live air pressure, as the spring constantly drives the rod outward to the extended position. For mid-stroke holding without continuous pressure, an external rod lock or a double-acting SDA cylinder is required.
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 STA20X25B FAQ
This cylinder delivers 108.9 N of net pull at 0.5 MPa and 161.7 N at 0.7 MPa. The operating pressure range is 0.2-1.0 MPa, requiring at least 0.2 MPa to overcome the internal return spring.
No, this specific SKU does not have a built-in magnet, so it cannot accept reed or electronic switches. You would need the STA20X25BS variant, which includes the magnet for sensing.
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