Airtac STA Single Acting Compact Guided Cylinder STA50X20B
The AirTAC Airtac STA Single Acting Compact Guided Cylinder STA50X20B is a genuine single-acting COMPACT cylinder (single acting, pull type) with a Ø50mm bore and 20mm 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
- Stroke20 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 STA50X20B
The AirTAC STA50X20B is a compact single-acting pull-type cylinder, meaning compressed air retracts the rod while an internal spring pushes it back out. It provides a robust 717.7 N net pull at 0.5 MPa, easily handling heavy tensioning tasks. Because the quoted force is already net of the spring, you can size directly to this rating without manual deductions.
This unit features a male M18x1.5 piston rod thread and a 20 mm stroke. Its short riveted body saves valuable axial mounting depth where a round-body cylinder will not fit. A fixed NBR bumper decelerates the stroke end, and it requires only one air line connected to its PT1/4 port for operation.
Airtac STA Single Acting Compact Guided Cylinder STA50X20B Technical Specifications
| Model | Airtac STA Single Acting Compact Guided Cylinder STA50X20B |
|---|---|
| Series | STA compact single-acting cylinder |
| Bore size | Ø50 mm |
| Stroke | 20 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 STA50X20B
| STA | Compact single acting, pull type cylinder series. |
|---|---|
| 50 | Bore size in mm. |
| ×20 | 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 STA50X20B Is Used
Heavy-Duty Hold-Down Clamping
Pulls large workpieces firmly into a fixture with 717.7 N of force at 0.5 MPa, using the spring to automatically release the clamp when air is removed.
Pallet Gate Retraction
Utilizes the 20 mm stroke to pull a diverter gate out of the conveyor path, relying on the internal spring to safely extend the barrier back into place during a fault.
Tote Lid Tensioning
Draws heavy container lids closed on a packaging line, taking advantage of the compact riveted body to fit within tight overhead axial clearances.
Is the Airtac STA Single Acting Compact Guided Cylinder STA50X20B the Right Cylinder?
When sizing this model, compare its 717.7 N net pull at 0.5 MPa against adjacent bores. Stepping down, the STA40 yields 445.1 N; stepping up, the STA63 provides 1225.5 N. This STA50X20B strikes a balance, offering a safe working load of roughly 431 N (about 60 percent of its 0.5 MPa rating) or a vertical lift capacity near 36.6 kg with a 2:1 safety margin.
Remember the 30 mm standard stroke ceiling and the spring-extend behavior: if air pressure drops, the spring drives the rod out, so it cannot hold a mid-stroke load without an external device. This specific SKU includes a male M18x1.5 rod thread and lacks a piston magnet, meaning it cannot accept reed or electronic switches without the -S option. Operating pressure must be 0.2-1.0 MPa to overcome the spring.
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 STA50X20B FAQ
This cylinder delivers a net pull force of 717.7 N at 0.5 MPa and 1047.5 N at 0.7 MPa. It requires an operating pressure of 0.2-1.0 MPa, with a minimum of 0.2 MPa necessary to overcome the internal return spring.
No, this specific SKU does not include a piston magnet, so it cannot accept AirTAC reed or electronic switches. You would need to select the -S option (STA50X20BS) to enable sensor groove compatibility.
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