Airtac SAIJ125 Adjustable Cylinder SAIJ125X135-75
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X135-75 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 135mm 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
- Stroke135 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X135-75
The AirTAC SAIJ125X135-75 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, allowing you to dial back the nominal 135mm travel by up to 75mm. This creates a highly flexible 60-135mm usable window, letting you fine-tune the retract end position during commissioning or product changeovers without physically swapping the barrel or adding external stops. It delivers a robust 8590N push force at 0.7 MPa.
Featuring a 32mm carbon steel piston rod and an M27x2 rod thread, this large-bore unit handles substantial side loads, though long unsupported strokes still require an external guide. The extruded aluminum barrel includes sensor grooves on both sides, and the rear adjuster acts purely as a travel stop, not a lock, meaning the cylinder cannot hold a load without live air pressure. For load-holding requirements, consider the SAIL or BSAI series instead.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X135-75 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X135-75 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 135 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 SAIJ125X135-75
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×135 | 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 SAIJ125X135-75 Is Used
Variable End-Stop Positioning
Dial in the exact retract distance between 60mm and 135mm on the fly to accommodate different material thicknesses without changing out the physical cylinder.
Product Line Changeover
Rapidly adjust the stroke stopper when switching the manufacturing line to a new product size, reducing downtime and eliminating the need for external mechanical stops.
Heavy-Duty Forming Setup
Leverage the 6136N push force at 0.5 MPa to execute high-force pressing or holding operations while fine-tuning the end position during machine commissioning.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X135-75 the Right Cylinder?
Choose this 125mm bore when your application demands high thrust that smaller neighbors cannot provide, such as the 80mm bore offering 3518N or the 100mm bore at 5497N push force at 0.7 MPa. The SAIJ125X135-75 is selected specifically when you need variable end-stops for product size changes on a line, rather than a fixed-stroke SAI cylinder. Since the stroke is 135mm, side-load risks are moderate, but ensuring proper mounting alignment remains critical.
To match this ISO 15552 dimensionally interchangeable cylinder, confirm the 125mm bore, 135mm stroke, 75mm adjustment range, PT tapered port thread, and the reduced SAIJ mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2). Note that this configuration omits FB, CA, CB, and CR mounts, and no magnet is specified for sensor switches.
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 SAIJ125X135-75 FAQ
The rear adjuster screw acts as a mechanical stopper that lets you shorten the effective stroke by up to 75mm from the nominal 135mm, providing a usable travel window of 60-135mm. It only sets the end position and decelerates the travel; it does not lock or hold the load without live air pressure.
At 0.7 MPa, the push force is 8590N and the pull force is 5734N. The maximum operating speed for the 125mm bore is 30-500 mm/s, which is lower than smaller bores to manage the inertia of the large piston.
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