Airtac SAIJ125 Adjustable Cylinder SAIJ125X50-20
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X50-20 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 50mm stroke, G1/2 air ports and adjustable end cushioning. Its standardized mounting interface makes it a drop-in replacement for other ISO 15552 cylinders in automation lines.
- BoreØ125 mm
- Stroke50 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X50-20
The AirTAC SAIJ125X50-20 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a robust 6136N push force at 0.5MPa and allows you to fine-tune the effective travel down to a 30-50mm window without adding external stops. This makes it ideal for high-thrust applications requiring precise end-position calibration during commissioning.
This model features a 32mm carbon steel piston rod with an M27x2 thread, paired with a PT tapered G1/2 port. The extruded aluminum barrel includes sensor grooves on both sides for flexible switch placement. While the rear adjuster sets the travel limit, remember it acts as a stop and not a lock; the cylinder will not hold a load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X50-20 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X50-20 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 50 mm |
| Acting type | Double acting |
| Port size | G1/2 |
| Rod thread | M27×2 |
| Fluid | Air (filtered by 40µm element) |
|---|---|
| Operating pressure | 0.15 – 1.0 MPa |
| Proof pressure | 1.5 MPa |
| Temperature | -20 to +70 °C |
| Speed range | 30 – 500 mm/s |
| Cushion | Adjustable, 40 mm |
| Max stroke | Up to 1500 mm |
Specifications follow the official AirTAC SAI series datasheet and ISO 15552 dimensions. Confirm against the product label before installation. Port options: G (BSPP) / NPT.
Theoretical Output Force (Ø125mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 6136 N | 5734 N |
| 0.7 MPa | 8590 N | — |
| Max (@1.0 MPa) | 1251 kgf | |
Actual usable force is lower than theoretical due to friction and back-pressure. Size with a safety margin.
Model Code: Airtac SAIJ125 Adjustable Cylinder SAIJ125X50-20
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×50 | Stroke length in mm. |
| -S | Optional built-in magnet for sensor position sensing. |
Related SAI-family variants: SAID (double rod), SAIJ (adjustable stroke), SAIL (with lock), SAIF (with valve), BSAI (enclasp / clamp-lock), and SAI-S with built-in magnet. Rod material: carbon steel (blank) / SUS420J2 (A) / SUS304 (B); seals: TPU (blank) / Viton H / NBR N.
Where the Airtac SAIJ125 Adjustable Cylinder SAIJ125X50-20 Is Used
High-Force Positioning
Delivers 6136N of thrust for clamping heavy components, with the 20mm adjuster allowing exact positioning of the end-stop during machine setup.
Product Changeovers
Quickly adapt the 30-50mm travel window for varying product sizes on a line without physically replacing the cylinder or adding spacers.
Heavy Machinery End-Stops
Provides a robust mechanical stop for heavy industrial actuators, fine-tuning the retraction point to prevent overtravel in automated cells.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X50-20 the Right Cylinder?
Choose this 125mm bore when a smaller 100mm unit (providing 3927N push at 0.5MPa) lacks the necessary thrust, but before stepping up to a 160mm bore. The adjustable 30-50mm window is perfect for product changeovers on a line, letting you dial in the exact end-stop mechanically instead of swapping out a fixed-stroke SAI cylinder. For load-holding without continuous air pressure, consider an external rod lock or the SAIL series.
To match this ISO 15552 interchangeable cylinder, confirm the 125mm bore, 50mm stroke, 20mm adjustment range, PT port threads, and the standard carbon steel rod. Mounting options include Basic, FA, LB, TC, FTC, TCM1, and TCM2. The standard speed range for this bore is 30-500mm/s, and since the stroke is under 300mm, external side-load guides are less critical than with longer strokes.
Quick checklist
- ✓ Required force at your working pressure
- ✓ Stroke and mounting space
- ✓ Port/thread type (PT/NPT/G)
- ✓ Magnet (-S) for sensors?
- ✓ Side load — consider a guided cylinder
Installation & Maintenance Notes
- check Use clean air filtered to 40µm or finer.
- check Keep within 0.15 – 1.0 MPa operating pressure.
- check Avoid side load on the piston rod.
- check Adjust end cushion screws for smooth stops.
- check Use correct mounting accessory (FA/FB/CA/CB/LB/TC).
- check Installation by qualified personnel per AirTAC docs.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X50-20 FAQ
At 0.5MPa operating pressure, this 125mm bore cylinder provides 6136N of push force and 5734N of pull force. At 0.7MPa, the push force increases to 8590N.
The rear adjuster acts as a mechanical stop that trims the effective travel. For this SAIJ125X50-20, you can shorten the 50mm nominal stroke by up to 20mm, creating a usable 30-50mm travel window for fine-tuning at commissioning.
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