Airtac SAIJ125 Adjustable Cylinder SAIJ125X210-40
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X210-40 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 SAIJ125X210-40
The AirTAC SAIJ125X210-40 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a usable travel window of 170 to 210 mm, allowing you to dial back the nominal 210 mm stroke by up to 40 mm during commissioning. Belonging to the 125 mm bore class, it delivers a robust 6136 N pull force at 0.5 MPa and reaches a maximum of 11045 N at 0.9 MPa.
This extruded aluminum barrel unit integrates a 32 mm carbon steel rod with an M27x2 thread, handling substantial side loads while still requiring an external guide for long unsupported strokes. It uses PT tapered ports sized at G1/2 and supports a speed range of 30-500 mm/s. The rear stopper mechanism sets the end position precisely but does not lock the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X210-40 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X210-40 |
|---|---|
| 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 SAIJ125X210-40
| 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 SAIJ125X210-40 Is Used
Variable End Stops
Dial in the 170-210 mm travel window on the fly to accommodate varying material thicknesses without physically changing the cylinder setup.
Machine Changeover
Quickly fine-tune the retract position during product-size line changes, using the rear stopper to hit exact new endpoints instantly.
Heavy Assembly Pressing
Leverage the 11045 N push force at 0.9 MPa for heavy-duty joining operations while adjusting the final stroke to suit different jig heights.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X210-40 the Right Cylinder?
Select this 125 mm bore model when an application requires high thrust combined with variable end-stop positioning. If your process needs less force, stepping down to a 100 mm bore yields 3681 N of pull at 0.5 MPa; conversely, moving up to a 160 mm bore provides 9425 N. Choose this adjustable SAIJ over a fixed-stroke SAI when you need fine end-position tuning for product changeovers without swapping cylinders or adding external stops.
For an exact ISO 15552 replacement match, verify the 125 mm bore, 210 mm stroke, 40 mm adjustment range, PT G1/2 port, and the desired mounting style (Basic, FA, LB, TC, FTC, TCM1, or TCM2). Because the nominal stroke is 210 mm, an external guide is recommended to manage side-load forces. Note that this cylinder does not hold its load without live air; for true load-holding, consider an AirTAC SAIL or BSAI series.
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 SAIJ125X210-40 FAQ
At 0.5 MPa it provides 6136 N of push and 5734 N of pull. At 0.9 MPa, the push force increases to 11045 N.
The rear adjuster acts as a stopper that trims the effective travel, creating a 170-210 mm usable window. It sets the end position but does not lock the load without continuous air pressure.
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