Airtac SAIJ125 Adjustable Cylinder SAIJ125X140-50S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X140-50S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 140mm 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
- Stroke140 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X140-50S
The AirTAC SAIJ125X140-50-S is a double-acting ISO 15552 profile cylinder equipped with a rear mechanical adjuster. It delivers substantial thrust, generating 6136N of pull force and 8590N of push force at 0.5 MPa. The built-in magnet enables position sensing using CMSE reed or DMSE solid-state switches. With a 140mm nominal stroke and a 50mm adjustment range, the effective travel window can be dialed back anywhere from 140mm down to 90mm.
This adjustability allows you to fine-tune the retract end-position during commissioning or product changeover without adding bulky external stops. The extruded aluminum barrel features sensor grooves on both sides for flexible switch mounting. The 32mm carbon steel piston rod and M27x2 thread provide a robust interface, while the PT tapered ports ensure a tight pneumatic connection. Variable air cushions at both ends manage deceleration, but note that the rear stopper only sets the travel end and does not hold the load without live air.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X140-50S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X140-50S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 140 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 SAIJ125X140-50S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×140 | 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 SAIJ125X140-50S Is Used
Press Fit Tuning
Fine-tune the pressing depth of heavy bearings or pins during machine commissioning, adjusting the 90-140mm travel window to accommodate different part tolerances.
Changeover Stops
Quickly reconfigure the retract end-position on a multi-product line by dialing the rear screw, eliminating the need to swap out physical spacer collars.
Material Forming
Provide up to 8590N of push force at 0.5 MPa for light bending or holding tasks, relying on the 50mm stroke adjustment to set the exact material bend depth.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X140-50S the Right Cylinder?
Select this 125mm bore when an application requires high force combined with variable end-stops. If your process needs less push force, stepping down to a 100mm bore yields 3927N at 0.5 MPa, whereas moving up to a 160mm bore provides 10053N of pull force. Choose this adjustable SAIJ variant over a fixed-stroke SAI cylinder when machine setups frequently change product sizes and require on-the-fly travel tuning. To match this ISO 15552 interchangeable cylinder, specify the 125mm bore, 140mm stroke, 50mm adjustment, PT G1/2 port, and the -S magnet option.
Because the 140mm stroke is relatively short for this large bore, side-load risks are minimal, but always ensure the load is guided to prevent rod binding. For applications that must hold a load mechanically without continuous air pressure, the SAIJ adjuster acts only as a stop; you should instead select an SAIL air-released lock or BSAI clamp-lock cylinder. SAIJ uses a reduced mounting set including Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting FB, CA, CB, and CR.
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 SAIJ125X140-50S FAQ
The rear adjuster acts as a mechanical stopper that trims the effective stroke. For the SAIJ125X140-50-S, you can shorten the 140mm nominal travel by up to 50mm, creating a usable 90-140mm travel window. It sets the end position but does not lock the load without live air.
At 0.5 MPa, the 125mm bore generates 6136N of pull force and 8590N of push force. At the maximum operating pressure of 1.0 MPa, it can deliver up to 1251 kgf of push force.
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