Airtac SAIJ125 Adjustable Cylinder SAIJ125AX185-40
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX185-40 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 185mm 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
- Stroke185 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX185-40
The AirTAC SAIJ125X185-40 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, allowing you to dial back the nominal 185 mm travel by up to 40 mm for a usable window of 145-185 mm. It delivers 6136 N of push force at 0.5 MPa and handles operating speeds of 30-500 mm/s. The extruded aluminum barrel features dual-side sensor grooves, and this specific configuration omits the -S magnet, meaning position sensing is not factory-equipped out of the box.
This unit utilizes a SUS420J2 stainless steel rod (material code A) for improved corrosion resistance compared to standard carbon steel. The rear adjustment screw functions purely as a mechanical stop to fine-tune the end position during commissioning; it does not lock or hold the load pneumatically. For applications requiring position holding without live air pressure, an external rod lock or related AirTAC series like SAIL or BSAI must be specified instead.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX185-40 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX185-40 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 185 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 SAIJ125AX185-40
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×185 | 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 SAIJ125AX185-40 Is Used
Product Changeover Tuning
Dial in the 145-185 mm travel window during line changeovers to accommodate different product lengths without physically replacing the actuator.
Variable End-Stop Setup
Use the rear adjuster to set precise retract positions during machine commissioning, preventing the need for external mechanical stops.
Heavy-Duty Forming
Leverage the 6136 N push force at 0.5 MPa for pressing or forming operations while trimming the stroke to protect tooling from overtravel.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX185-40 the Right Cylinder?
Choose this 125 mm bore when a machine setup requires precise variable end-stops during product changeovers, avoiding the need to physically swap cylinders or bolt on external stopper blocks. If your application needs less force, stepping down to an 80 mm bore yields 2513 N at 0.5 MPa, whereas moving up to a 160 mm bore provides 10053 N for heavier payloads. Because the 185 mm stroke exceeds the 1500 mm maximum standard threshold, it is a standard length, but any stroke of 300 mm or more on larger SAIJ models would require an external guide to manage side loads.
When replacing an ISO 15552 cylinder, match the 125 mm bore, 185 mm nominal stroke, 40 mm adjustment range, PT tapered port threads, and the reduced SAIJ mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2). Note that SAIJ omits the FB, CA, CB, and CR mountings. If you require position feedback, select an -S variant to support AirTAC CMSE reed or DMSE electronic sensors.
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 SAIJ125AX185-40 FAQ
At a 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. At the maximum 1.0 MPa pressure, it delivers up to 1251 kgf of push force.
The rear adjuster acts as a mechanical stop that shortens the 185 mm nominal stroke by up to 40 mm, creating a 145-185 mm usable travel window. It only sets the end position and does not lock the load without live air pressure.
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