Airtac SAIJ125 Adjustable Cylinder SAIJ125AX500-75
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX500-75 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 500mm 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
- Stroke500 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX500-75
The AirTAC SAIJ125X500-75 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that trims the effective travel back by up to 75 mm, creating a usable window of 425 to 500 mm. Delivering 6136 N of pull force at 0.5 MPa, it handles heavy actuation tasks while allowing precise end-position tuning during commissioning without adding external stops. The extruded aluminum barrel includes sensor grooves on both sides for flexible switch placement.
This unit is built with a SUS420J2 stainless steel rod (material code A) for enhanced corrosion resistance and features PT tapered port threads. It operates at 30 to 500 mm/s and uses variable air cushions at both ends to decelerate the load. The rear adjuster acts only as a travel stop and does not hold the load without continuous live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX500-75 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX500-75 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 500 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 SAIJ125AX500-75
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×500 | 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 SAIJ125AX500-75 Is Used
Press Fit Tuning
Dial in the exact 425-500 mm bottoming position for different bearing housings during assembly without swapping out the entire actuator.
Product Diversion
Adjust the retract stop distance on the fly to accommodate varying package lengths on a packaging line.
Machine Changeover
Quickly reset the effective stroke end-point when switching a production line to a new product format.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX500-75 the Right Cylinder?
Select this 125 mm bore cylinder when an application requires substantial thrust combined with variable end-stop positioning, such as pressing or forming operations where the exact bottom position changes between product runs. If your process needs less force, stepping down to a 100 mm bore yields 3681 N of pull at 0.5 MPa, while moving up to a 160 mm bore provides 9425 N. Choose this adjustable SAIJ model over a fixed-stroke SAI when you need on-the-fly travel adjustments during machine changeover.
Because the nominal stroke is 500 mm, an external guide is recommended to manage side loads on the extended rod. To match this ISO 15552 dimensionally interchangeable cylinder, specify the 125 mm bore, 500 mm stroke, 75 mm adjustment, PT port thread, and your required mounting style from the SAIJ set (Basic, FA, LB, TC, FTC, TCM1, TCM2). Note that this plain version lacks a magnet; for position sensing you would need the -S variant with CMSE reed or DMSE electronic sensors. For load-holding without live air, consider an AirTAC SAIL or BSAI cylinder instead of relying on the adjuster.
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 SAIJ125AX500-75 FAQ
A rear external stopper screw lets you shorten the nominal 500 mm stroke by up to 75 mm, providing an adjustable travel window of 425 to 500 mm. This allows fine-tuning of the retract end position at commissioning without external stops.
At 0.5 MPa it provides 6136 N of pull force and 8590 N of push force. At the maximum operating pressure of 1.0 MPa, it delivers up to 1251 kgf.
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Standard models usually ship in 3-4 days.
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