Airtac SAIJ125 Adjustable Cylinder SAIJ125X240-40
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X240-40 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 240mm 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
- Stroke240 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X240-40
The AirTAC SAIJ125X240-40 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a usable travel window of 200 to 240 mm, allowing you to trim the nominal 240 mm stroke by up to 40 mm. This bore size delivers a robust 6136 N pull force at 0.5 MPa, making it well-suited for heavy-duty positioning tasks.
The extruded aluminum barrel includes sensor grooves on both sides for mounting CMSE reed or DMSE electronic switches. The standard carbon steel rod features an M27x2 thread, and the cylinder uses a PT tapered G1/2 port. Adjustable air cushions at both ends work alongside the rear stopper to manage end-of-stroke deceleration.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X240-40 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X240-40 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 240 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 SAIJ125X240-40
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×240 | 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 SAIJ125X240-40 Is Used
Variable End-Stop Positioning
Dial in the exact retract distance between 200 and 240 mm to accommodate varying material thicknesses on the fly without installing external physical stops.
Machine Changeover Setup
Speed up product line changeovers by turning the rear adjuster screw to set new end positions, minimizing downtime and avoiding cylinder replacement.
Heavy-Duty Forming Press
Leverage the 6136 N pull force at 0.5 MPa to actuate heavy forming or clamping mechanisms where precise stroke limits are required for safety.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X240-40 the Right Cylinder?
Choose this 125 mm bore when you need higher force than an 80 mm bore (which provides 2268 N pull at 0.5 MPa) but want to avoid the larger footprint of a 160 mm cylinder. The 40 mm adjustment range is ideal for fine-tuning the retract end position during machine setup or product changeover without swapping hardware. Mounting options include Basic, FA, LB, TC, FTC, TCM1, and TCM2.
Because the rear adjuster acts only as a travel stop and the cushions manage deceleration, neither will hold a load without live air pressure. For fail-safe load holding, consider an external rod lock, a pilot-operated check valve, or the AirTAC SAIL or BSAI cylinder series. As a true ISO 15552 profile cylinder, it is dimensionally interchangeable with other ISO 15552 cylinders.
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 SAIJ125X240-40 FAQ
At a 0.5 MPa operating pressure, this 125 mm bore cylinder generates 6136 N of pull force and 8590 N of push force. At 0.7 MPa, the push force increases to 11045 N.
The rear adjuster screw acts as a mechanical stop that lets you shorten the effective stroke from the nominal 240 mm down to 200 mm. It sets the travel end and deceleration point but does not lock the load without continuous air pressure.
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