Airtac SAIJ125 Adjustable Cylinder SAIJ125X210-20
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X210-20 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 210mm 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
- Stroke210 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X210-20
The AirTAC SAIJ125X210-20 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to fine-tune the end-of-travel position. With a 210 mm nominal stroke and a 20 mm adjustment range, it provides a usable travel window of 190 to 210 mm. This lets you dial in exact end positions at commissioning without swapping out the physical cylinder or adding external stops.
Belonging to the 125 mm bore class, it delivers 8590 N of thrust at 0.7 MPa and uses a G1/2 port with a 32 mm carbon steel rod. The extruded aluminum barrel includes sensor grooves on both sides for flexible mounting, and the rear adjuster acts purely as a travel stop to set deceleration, meaning it will not hold a load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X210-20 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X210-20 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 210 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 SAIJ125X210-20
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×210 | 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 SAIJ125X210-20 Is Used
Product Changeovers
Quickly adapt end-stops for varying product lengths on a packaging line without physically replacing the actuator.
Machine Setup Tuning
Fine-tune the exact 190-210 mm retract position during commissioning to perfectly align a heavy press tool.
Variable End Stops
Adjust the travel window on the fly for diverter arms handling different package sizes on a high-force conveyor.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X210-20 the Right Cylinder?
Choose this 125 mm bore when you need higher force than an 80 mm cylinder (which provides 3518 N at 0.7 MPa) but want to avoid stepping up to a 160 mm bore. The adjustable stroke is ideal for product-size changeovers on a line, allowing you to trim the travel back by up to 20 mm during setup rather than machining new hard stops. For load-holding applications without live air, consider the SAIL or BSAI series, as this adjuster is not a locking brake.
As a dimensionally interchangeable ISO 15552 cylinder, it matches standard mounting interfaces using PT tapered port threads, a carbon steel rod, and no magnet. Because the 210 mm stroke is relatively long, ensure you use an external guide to prevent excessive side-loading on the rod, and note that SAIJ supports Basic, FA, LB, TC, FTC, TCM1, and TCM2 mounts.
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 SAIJ125X210-20 FAQ
This 125 mm bore cylinder provides 6136 N of push force at 0.5 MPa and 8590 N at 0.7 MPa. At its maximum operating pressure of 1.0 MPa, it delivers up to 1251 kgf of thrust.
The rear adjuster screw lets you shorten the 210 mm nominal stroke by up to 20 mm, creating a usable travel window of 190 to 210 mm. This stopper sets the end position but does not lock the load without continuous air pressure.
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