Airtac SAIJ125 Adjustable Cylinder SAIJ125AX75-50
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX75-50 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 75mm 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
- Stroke75 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX75-50
The AirTAC SAIJ125X75-50 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to trim the effective travel down to a 25-75 mm window. Delivering a robust 8590 N push force at 0.7 MPa, it handles heavy loads while allowing precise end-position tuning during commissioning. The extruded aluminum barrel includes sensor grooves on both sides, and this specific configuration uses an SUS420J2 stainless steel rod for improved corrosion resistance.
This model features a PT tapered port thread and operates at speeds of 30-500 mm/s. The rear screw acts as a travel stop for fine-tuning without swapping the cylinder, but it does not lock the load without live air. For load-holding without pneumatic pressure, an external rod lock or related types like SAIL or BSAI are required.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX75-50 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX75-50 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 75 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 SAIJ125AX75-50
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×75 | 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 SAIJ125AX75-50 Is Used
Product Changeovers
Quickly dial the stroke back from 75 mm to 25 mm via the rear adjuster when switching machinery to handle a different pallet or package size.
Heavy Press Fit Tuning
Leverage the 6136 N push force at 0.5 MPa to seat heavy components, using the adjuster to fine-tune the bottoming position without reprogramming the motion controller.
Adjustable End Stops
Replace rigid fixed stops on automated assembly lines with a clean, integrated adjustment screw to vary the retraction end-point during prototyping.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX75-50 the Right Cylinder?
Choose this 125 mm bore when a 100 mm cylinder (providing 5497 N push at 0.7 MPa) lacks the thrust for your setup, but a 160 mm bore is oversized. The 50 mm adjustment range is exceptionally useful for product-size changeovers on a line, letting you dial in the exact 25-75 mm travel window without adding external stops. When specifying an ISO 15552 replacement, match the 125 mm bore, 75 mm stroke, PT port thread, SUS420J2 rod material, and desired mounting from the SAIJ subset (Basic, FA, LB, TC, FTC, TCM1, TCM2). Because the nominal stroke is under 300 mm, side-load concerns are minimal, but always ensure the load is guided to prevent rod binding.
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 SAIJ125AX75-50 FAQ
At 0.5 MPa, the push force is 6136 N and the pull force is 5734 N. At 0.7 MPa, the push force increases to 8590 N. The maximum push force is 1251 kgf at 1.0 MPa.
The rear adjuster screw lets you shorten the 75 mm nominal stroke by up to 50 mm, creating a usable travel window of 25 to 75 mm. The adjuster acts as a mechanical stop to set the end position and does not function as a lock to hold the load without air pressure.
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