Airtac SAIJ125 Adjustable Cylinder SAIJ125AX140-50
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX140-50 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 140mm 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
- Stroke140 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX140-50
The AirTAC SAIJ125X140-50 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a nominal 140 mm stroke that can be dialed back by up to 50 mm, yielding a highly versatile 90-140 mm usable travel window for precise end-position tuning. Delivering 6136 N of push force at 0.5 MPa, it handles heavy loads with a robust 32 mm piston rod. This specific SKU utilizes a SUS420J2 stainless steel rod (material code A) for enhanced corrosion resistance and features PT tapered port threads.
The extruded aluminum barrel includes sensor grooves on both sides for flexible switch mounting. It is important to note that the rear adjuster acts strictly as a mechanical stop to set the travel end and deceleration point alongside the air cushions; it does not hold the load without live air pressure. For applications requiring true position holding, a SAIL pneumatic lock or BSAI clamp-lock cylinder is recommended.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX140-50 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX140-50 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 140 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 SAIJ125AX140-50
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×140 | 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 SAIJ125AX140-50 Is Used
Machine Setup & Changeover
Dial in the exact 90-140 mm end-stop during machine commissioning or product family transitions without swapping hardware or adding external stopper blocks.
Variable End-Stop Positioning
Ideal for assembly stations where the rear mechanical stop must be fine-tuned to accommodate varying part dimensions on the fly.
Heavy-Duty Clamping
Leverage the 6136 N push force at 0.5 MPa to secure heavy workpieces, using the 50 mm adjustment window to set precise clamping depth.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX140-50 the Right Cylinder?
Select this 125 mm bore adjustable-stroke cylinder when your equipment requires exact end-stop calibration during commissioning or frequent product-size changeovers, avoiding the need to physically swap out a fixed-stroke SAI cylinder. If your application demands less force, stepping down to an 80 mm bore yields 2513 N of push force at 0.5 MPa, whereas moving up to a 160 mm bore provides 10053 N.
When replacing an ISO 15552 cylinder, match the 125 mm bore, 140 mm nominal stroke, 50 mm adjustment range, PT G1/2 port threads, and the specific mounting bracket from the SAIJ subset (Basic, FA, LB, TC, FTC, TCM1, TCM2). Although the 140 mm stroke is relatively short, the heavy 32 mm rod handles high side loads well, yet an external guide should still be considered for optimal bearing life. Since no magnet is specified, position sensing via CMSE or DMSE switches is not supported without adding the -S option.
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 SAIJ125AX140-50 FAQ
The rear adjuster screw allows you to shorten the effective travel by up to 50 mm from the nominal 140 mm stroke. This creates a 90-140 mm adjustable window, letting you fine-tune the retract end position at commissioning without changing the cylinder or adding external stops.
At a 0.5 MPa operating pressure, this 125 mm bore cylinder generates 6136 N of push force and 5734 N of pull force. It can deliver up to 1251 kgf at its maximum 1.0 MPa pressure rating.
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