Airtac SAIJ125 Adjustable Cylinder SAIJ125AX35-20S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX35-20S 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 SAIJ125AX35-20S
The AirTAC SAIJ125X35-20-S is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It delivers robust thrust, pushing 6136N and pulling 5734N at 0.5 MPa, within a usable travel window of 15 to 35mm. This specific SKU features a SUS420J2 stainless steel rod for enhanced corrosion resistance and includes a magnet for position sensing.
The integrated rear stopper allows you to dial back the nominal 35mm stroke by up to 20mm without swapping out the cylinder. This profile cylinder extrusion includes sensor grooves on both sides, compatible with AirTAC CMSE reed and DMSE electronic solid-state switches. It supports a reduced mounting subset of Basic, FA, LB, TC, FTC, TCM1, and TCM2.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX35-20S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX35-20S |
|---|---|
| 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 SAIJ125AX35-20S
| 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 SAIJ125AX35-20S Is Used
Variable End-Stop Tuning
Fine-tune the retraction end position within the 15-35mm window during machine commissioning to accommodate varying product thicknesses without adding external mechanical stops.
Quick Product Changeover
Rapidly adjust the effective stroke on packaging lines when switching between different package sizes, utilizing the 20mm rear adjustment screw to set precise motion limits.
Heavy-Duty Pressing
Leverage the 6136N push force at 0.5 MPa for short-stroke pressing or clamping operations where exact contact depth must be dialed in on the fly.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX35-20S the Right Cylinder?
Choose this 125mm bore when your application requires heavy thrust (6136N at 0.5 MPa) but only a short, finely adjustable travel distance. If your force requirements are lower, stepping down to a 100mm bore yields 3927N push force, whereas moving up to a 160mm bore provides 10053N. The adjustable rear stopper is ideal for product changeovers, letting you fine-tune the end position during commissioning instead of machining external stops or using a fixed-stroke SAI cylinder.
For load-holding requirements, remember that the rear adjuster and air cushions only set the travel end and decelerate the load; they do not lock the rod. A plain SAIJ will not hold position without live air, so for safety clamping, consider a BSAI clamp-lock cylinder. This model uses PT tapered ports, and while the 32mm rod diameter handles high side loads well, any long unsupported stroke still requires an external guide.
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 SAIJ125AX35-20S FAQ
At an operating pressure of 0.5 MPa, this 125mm bore cylinder provides a push force of 6136N and a pull force of 5734N. At the maximum operating pressure of 1.0 MPa, the maximum push force is 1251 kgf.
The nominal stroke is 35mm, but the rear adjusting screw allows you to shorten the effective travel by up to 20mm. This creates a usable stroke window of 15 to 35mm, enabling precise end-position tuning at commissioning without replacing the cylinder.
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