Airtac SAIJ125 Adjustable Cylinder SAIJ125AX210-40
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX210-40 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 SAIJ125AX210-40
The AirTAC SAIJ125X210-40 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It delivers 6136 N of push force at 0.5 MPa and provides a usable travel window of 170 to 210 mm, letting you dial back the nominal 210 mm stroke by up to 40 mm. This built-in stopper allows precise end-position tuning at commissioning without adding external stops.
This 125 mm bore unit features a SUS420J2 stainless steel rod for corrosion resistance and uses PT G1/2 tapered ports. It includes variable air cushions at both ends to manage kinetic energy, but note the adjuster acts only as a travel stop, not a lock. For position holding without live air, consider an external rod lock or AirTAC SAIL series.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX210-40 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX210-40 |
|---|---|
| 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 SAIJ125AX210-40
| 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 SAIJ125AX210-40 Is Used
Variable End-Stop Forming
Fine-tune the 170-210 mm travel window to accommodate different material thicknesses in pressing operations without swapping cylinders.
Product Changeover Diverter
Adjust the rear stopper on the fly to handle varying package sizes on a packaging line, ensuring precise positioning.
Machine Setup Calibration
Dial in the exact retract position during initial commissioning, using the 40 mm adjustment range to perfect the mechanical sequence.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX210-40 the Right Cylinder?
Choose this 125 mm bore if your application requires around 6133 N of thrust at 0.5 MPa. If you need less force, stepping down to an 80 mm bore yields 2513 N push force, while moving up to a 160 mm bore provides 10053 N. The SAIJ125X210-40 is ideal for machine setups requiring variable end stops during product changeovers, replacing fixed-stroke SAI cylinders when exact travel distances must be fine-tuned on the fly.
When replacing an ISO 15552 cylinder, match the 125 mm bore, 210 mm nominal stroke, 40 mm adjustment range, PT G1/2 ports, and the double-acting configuration. Since the stroke is 210 mm, ensure proper guiding to handle side loads. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2 options, omitting FB, CA, CB, and CR. This model lacks a magnet, so it does not support CMSE or DMSE sensors.
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 SAIJ125AX210-40 FAQ
The rear adjuster acts as a mechanical stop, allowing you to shorten the effective stroke by up to 40 mm. This creates a usable travel window of 170 to 210 mm, which is set at commissioning without changing the cylinder's physical mounting.
At an operating pressure of 0.5 MPa, the SAIJ125X210-40 provides 6136 N of push force and 5734 N of pull force. At 0.7 MPa, the push force increases to 8590 N.
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