Airtac SAIJ125 Adjustable Cylinder SAIJ125X35-20S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X35-20S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 35mm 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
- Stroke35 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X35-20S
The AirTAC SAIJ125X35-20-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers 6136N of push force at 0.5 MPa and features a 20mm adjustment range, creating a precise 15-35mm usable travel window for short-stroke applications. The integrated magnet (-S) supports AirTAC CMSE reed and DMSE electronic sensors for exact position detection.
This bore size utilizes a robust 32mm piston rod and M27x2 rod thread to handle high side loads. Unlike fixed-stroke alternatives, the external rear stopper allows you to fine-tune the retract end position at commissioning without adding external stops. The extruded aluminum barrel includes sensor grooves on both sides, and the mounting set supports Basic, FA, LB, TC, FTC, TCM1, and TCM2 brackets.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X35-20S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X35-20S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 35 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 SAIJ125X35-20S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×35 | 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 SAIJ125X35-20S Is Used
Short-Stroke Clamping
Ideal for heavy-duty clamping tasks where the 15-35mm travel window must be dialed in precisely to accommodate varying material thicknesses without repositioning the fixture.
Product Changeover
Enables rapid line changeovers by allowing operators to fine-tune the retract end position on the rear stopper, adapting to new product sizes in seconds.
High-Force Ejection
Delivers 6136N of push force for ejecting heavy parts from molds or presses, with the 20mm adjustment providing a safety buffer for exact ejection points.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X35-20S the Right Cylinder?
Choose this 125mm bore when a 100mm cylinder (providing 3927N push at 0.5 MPa) lacks the necessary thrust, but a 160mm bore is physically too large. The 15-35mm adjustable travel window is ideal for applications requiring exact end-position tuning during machine setup or product changeover. Because the stroke is short, side-load stress is minimal, but always ensure the M27x2 rod thread is properly aligned. The PT tapered port ensures a tight, leak-free pneumatic connection.
Remember that the rear adjuster functions strictly as a travel stop, not a lock; it cannot hold a load without continuous live air. For load-holding requirements without air pressure, consider the SAIL (air-released lock) or BSAI (clamp-lock) variants. This cylinder is dimensionally interchangeable with ISO 15552 cylinders of the same bore and stroke, featuring a standard carbon steel rod and operating speed range of 30-500 mm/s.
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 SAIJ125X35-20S FAQ
At 0.5 MPa operating pressure, this 125mm bore cylinder provides 6136N of push force and 5734N of pull force. At 0.7 MPa, the push force increases to 8590N.
The rear adjuster screw acts as an external stopper, allowing you to shorten the 35mm nominal stroke by up to 20mm. This creates a usable travel window of 15-35mm, which can be fine-tuned during commissioning without swapping the cylinder.
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