Airtac SAIJ125 Adjustable Cylinder SAIJ125X275-100
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X275-100 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 275mm 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
- Stroke275 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X275-100
The AirTAC SAIJ125X275-100 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster. It provides a substantial 6136N push force at 0.5MPa, featuring a 275mm nominal stroke that can be dialed back by up to 100mm to establish a precise 175-275mm usable travel window. This built-in adjustability allows operators to fine-tune end positions during commissioning or product changeovers without swapping out the entire actuator.
Constructed with an extruded aluminum barrel and a carbon steel piston rod, this 125mm bore actuator utilizes PT tapered G1/2 ports and operates at speeds between 30-500mm/s. It supports AirTAC CMSE reed and DMSE electronic sensors via sensor grooves on both sides of the barrel. The rear stopper mechanism strictly governs travel endpoints and deceleration, meaning it does not mechanically hold a load without continuous live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X275-100 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X275-100 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 275 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 SAIJ125X275-100
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×275 | 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 SAIJ125X275-100 Is Used
Variable End-Stop Configuration
Dial in the 175-275mm travel window during machine setup to accommodate different material thicknesses without changing the physical cylinder mounting.
Product Size Changeovers
Quickly retract the rear stopper by up to 100mm on automated lines to instantly adapt the stroke for new packaging dimensions or part sizes.
Heavy Pressing Operations
Leverage the 6136N push force at 0.5MPa for heavy-duty assembly presses, using the fine-tune adjustment to perfectly set the bottoming position.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X275-100 the Right Cylinder?
Selecting this 125mm bore actuator makes sense when your application requires heavy push thrust up to 6136N at 0.5MPa, stepping up from a 100mm bore that provides 3927N. The 100mm adjustment range is ideal for machinery processing varying product sizes, offering a variable end-stop that prevents the need to bolt on external physical stops. For load-holding requirements without live air pressure, this cylinder is insufficient as the adjuster is only a stop, so you should explore an AirTAC SAIL pneumatic lock or BSAI clamp-lock cylinder instead.
To match this ISO 15552 cylinder for a direct replacement, verify the 125mm bore, 275mm stroke, 100mm adjustment range, PT G1/2 port thread, and the specific mounting accessory from the SAIJ subset (Basic, FA, LB, TC, FTC, TCM1, or TCM2). Because the 275mm stroke exceeds 300mm safety thresholds for side-loading, ensure you use an external guide to support the load and prevent rod bending.
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 SAIJ125X275-100 FAQ
At a 0.5MPa operating pressure, this 125mm bore cylinder provides 6136N of push force and 5734N of pull force. At 0.7MPa, the push force increases to 8590N.
The rear external adjuster acts as a mechanical stop that allows you to shorten the 275mm nominal stroke by up to 100mm, creating a flexible 175-275mm travel window. It only sets the end position and does not lock or hold the load without live air pressure.
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