Airtac SAIJ125 Adjustable Cylinder SAIJ125X170-20S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X170-20S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 170mm 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
- Stroke170 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X170-20S
The AirTAC SAIJ125X170-20-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers 6136N of push force at 0.5MPa and features a 150-170mm usable travel window, letting you trim the nominal 170mm stroke by up to 20mm. This built-in adjustability simplifies commissioning and product-size changeovers without swapping hardware.
This variant includes a magnet for CMSE reed and DMSE electronic sensors, utilizing the dual sensor grooves machined into the extruded aluminum barrel. It uses a PT tapered port and a robust 32mm carbon steel rod with an M27x2 thread. The mounting set covers Basic, FA, LB, TC, FTC, TCM1, and TCM2, deliberately omitting FB, CA, CB, and CR brackets.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X170-20S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X170-20S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 170 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 SAIJ125X170-20S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×170 | 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 SAIJ125X170-20S Is Used
Product Size Changeover
Dial in the 150-170mm travel window during format changes on packaging lines, allowing rapid adaptation to different carton heights without changing the cylinder.
End-Position Tuning
Fine-tune the retraction end-stop during machine commissioning to achieve exact material clamping or forming depths, avoiding the cost of custom-machined external stoppers.
Heavy Forming Press
Leverage the 6136N push force at 0.5MPa for heavy-duty pressing or holding tasks, using the PT port and robust 32mm carbon steel rod to withstand high operational stress.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X170-20S the Right Cylinder?
Select this 125mm bore when a 63mm cylinder (1402N pull at 0.5MPa) lacks the power for heavy actuation, but an 80mm bore (2268N pull) would be excessive. The adjustable 150-170mm window is perfect for machines that run multiple product sizes, replacing the need for fixed SAI cylinders and external mechanical stops. The rear adjuster acts purely as a travel stop for end-position tuning and relies on the variable air cushion for deceleration; it is not a locking device.
Because the 170mm stroke is below the 300mm threshold, side-load risks are moderate, though the large 32mm rod and M27x2 thread provide excellent resistance to deflection. For load-holding without live air pressure, this cylinder will not suffice—you must integrate an external rod lock or pilot-operated check valve, or switch to an AirTAC SAIL or BSAI model. This unit is dimensionally interchangeable per ISO 15552.
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 SAIJ125X170-20S FAQ
At 0.5MPa, this 125mm bore cylinder provides 6136N of push force and 5734N of pull force. At the maximum operating pressure of 1.0MPa, the push force reaches 12272N.
The rear adjuster screw allows you to shorten the nominal 170mm stroke by up to 20mm, creating a usable travel window of 150-170mm. This stopper sets the end position but does not lock the load without live air pressure.
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