Airtac SAIJ125 Adjustable Cylinder SAIJ125X210-30
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X210-30 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 SAIJ125X210-30
The AirTAC SAIJ125X210-30 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, delivering 6136N of push force at 0.5 MPa. It features a 32mm carbon steel piston rod and PT tapered G1/2 ports. By turning the rear screw, you unlock a usable travel window of 180-210mm, allowing precise end-position tuning without swapping hardware.
This adjustable-stroke design eliminates the need for external stops during machine setup or product changeovers. The extruded aluminum barrel includes dual sensor grooves for CMSE reed or DMSE electronic switches, though this specific SKU is configured without a magnet. The rear adjuster acts purely as a travel stop to set deceleration, meaning it will not hold the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X210-30 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X210-30 |
|---|---|
| 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 SAIJ125X210-30
| 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 SAIJ125X210-30 Is Used
Product Changeover
Dial in the 180-210mm travel window during packaging line format changes to accommodate different carton depths without changing the cylinder.
Machine Setup
Fine-tune the rear stopper during commissioning to set exact deceleration points for heavy 6136N thrust applications.
Variable End Stops
Adjust the effective stroke on automated assembly presses where multiple end-of-travel positions are required for different tooling.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X210-30 the Right Cylinder?
Choose this 125mm bore when an 80mm cylinder (providing 2513N push at 0.5 MPa) lacks the thrust for heavy positioning tasks, but a 160mm bore is oversized. The 30mm adjustment range is ideal for dialing in exact end stops during commissioning, replacing fixed-stroke SAI cylinders when product sizes vary on the line. For load-holding without continuous air, select a SAIL or BSAI cylinder instead, as this rear stop is not a lock.
To match this ISO 15552 cylinder for a direct replacement, verify the 210mm nominal stroke, 30mm adjustment code, PT port threads, and the reduced SAIJ mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2). Because the 210mm stroke exceeds 300mm? No, at 210mm side-load risks are moderate, but for longer unsupported strokes, always use an external guide to protect the rod.
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 SAIJ125X210-30 FAQ
At 0.5 MPa operating pressure, this 125mm bore cylinder provides 6136N of push force and 5734N of pull force. It can reach a maximum push force of 11045N at 0.9 MPa.
The rear adjuster screw allows you to shorten the 210mm nominal stroke by up to 30mm, creating a usable travel window of 180-210mm. This stopper sets the travel end and deceleration point but does not lock the load without live air.
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