Airtac STA Single Acting Compact Guided Cylinder STA20X20B
The AirTAC Airtac STA Single Acting Compact Guided Cylinder STA20X20B is a genuine single-acting COMPACT cylinder (single acting, pull type) with a Ø20mm 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.
- BoreØ20 mm
- Stroke20 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 STA20X20B
The AirTAC STA20X20B is a compact single-acting pull-type cylinder where compressed air retracts the rod and an internal spring pushes it back out. It provides 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. Because the quoted force is already net of the return spring, you can size directly to this value.
Featuring a male M6x1.0 piston rod thread and an 8 mm rod diameter, this unit fits tight spaces with its short riveted body. It uses a fixed NBR bumper to decelerate the stroke end rather than an adjustable cushion. Operating pressure spans 0.2-1.0 MPa, requiring at least 0.2 MPa to overcome the spring.
Airtac STA Single Acting Compact Guided Cylinder STA20X20B Technical Specifications
| Model | Airtac STA Single Acting Compact Guided Cylinder STA20X20B |
|---|---|
| Series | STA compact single-acting cylinder |
| Bore size | Ø20 mm |
| Stroke | 20 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 STA20X20B
| STA | Compact single acting, pull type cylinder series. |
|---|---|
| 20 | 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 STA20X20B Is Used
Gate Retraction
Uses the 108.9 N net pull to draw a diverter gate inward, letting the internal spring push it back open when air drops.
Film Tensioning
Pulls a packaging film carriage back against a stop, using the spring-extend action to maintain baseline tension.
Vertical Lift
Lifts a 5.6 kg fixture vertically with a 2:1 safety margin via the male M6x1.0 threaded rod end.
Is the Airtac STA Single Acting Compact Guided Cylinder STA20X20B the Right Cylinder?
When sizing this 20 mm bore, compare it to its neighbors: the STA16 yields 66.4 N net pull at 0.5 MPa, while the STA25 offers 177.7 N. This makes the STA20X20B ideal for medium-duty tensioning tasks. The 20 mm stroke sits well below the 30 mm single-acting ceiling.
This SKU includes the male M6x1.0 rod thread (-B) but lacks the -S magnet, so it cannot accept reed or electronic switches. Remember that the spring drives the rod to the extended position on air loss; it will not hold a mid-stroke load without external locking. The port is fixed at M5x0.8.
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 STA20X20B FAQ
This cylinder outputs 108.9 N of net pull at 0.5 MPa and 161.7 N at 0.7 MPa. These figures already subtract the return spring force, representing the actual load capacity available.
No, this specific SKU lacks the -S magnet option and cannot accept reed or electronic switches. You would need the -S variant for position sensing.
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