Airtac SAIJ125 Adjustable Cylinder SAIJ125X120-20S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X120-20S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 120mm 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
- Stroke120 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X120-20S
The AirTAC SAIJ125X120-20-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, providing a usable travel window of 100 to 120 mm. Belonging to the 125 mm bore class, it delivers 6136 N of push force and 5734 N of pull force at 0.5 MPa, making it suitable for heavy-duty positioning tasks. The integrated -S magnet enables position sensing via AirTAC CMSE reed or DMSE electronic solid-state switches.
Instead of relying on a fixed stop, the external adjusting screw lets you dial in the exact retract end-position during commissioning without swapping hardware. The carbon steel rod features an M27x2 thread, and the cylinder operates at 30-500 mm/s. Remember that the rear adjuster functions strictly as a travel stop, not a locking device; it cannot hold a load without continuous live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X120-20S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X120-20S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 120 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 SAIJ125X120-20S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×120 | 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 SAIJ125X120-20S Is Used
Machine Changeover
Quickly adjust the retract end-stop by up to 20 mm when switching a production line to a new product size, avoiding the need to physically swap out cylinders.
Heavy Clamping
Provides 6136 N of clamping force at 0.5 MPa while allowing operators to fine-tune the exact clamping depth during initial machine setup.
Sensor Integration
The integrated magnet works seamlessly with DMSE solid-state sensors to confirm end positions in automated assembly lines.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X120-20S the Right Cylinder?
Select this adjustable-stroke model when an application requires fine-tuning the retract distance on the fly, such as accommodating slight variations in workpiece dimensions. If your setup demands less force, stepping down to a 100 mm bore yields 3927 N of push force at 0.5 MPa. For load-holding without pneumatic pressure, a plain SAIJ is insufficient—consider an AirTAC SAIL or BSAI locking cylinder instead.
To match this exact configuration for an ISO 15552 replacement, specify a 125 mm bore, 120 mm nominal stroke, 20 mm adjustment range, PT tapered port thread, and the -S magnet option. The available mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2. Although the 120 mm stroke is relatively short, the robust M27x2 rod thread handles high side loads well, though external guides are always recommended for heavy lateral forces.
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 SAIJ125X120-20S FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder generates 6136 N of push force and 5734 N of pull force. At the maximum 1.0 MPa pressure, it achieves 1251 kgf.
The rear adjuster screw allows you to shorten the 120 mm nominal stroke by up to 20 mm, creating a usable travel window of 100 to 120 mm. The adjuster acts as a physical stop to set the end position and is not a lock.
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