Airtac SAIJ125 Adjustable Cylinder SAIJ125X155-40S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X155-40S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 155mm 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
- Stroke155 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X155-40S
The AirTAC SAIJ125X155-40-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, enabling you to dial back the nominal 155 mm travel by up to 40 mm for a usable 115-155 mm window. It delivers 6136 N of pull force at 0.5 MPa and 8590 N of push force at 0.7 MPa, making it suited for heavy-duty positioning tasks.
This unit includes a standard carbon steel piston rod and a magnet (-S) for use with AirTAC CMSE reed and DMSE electronic sensors housed in the dual-side barrel grooves. The rear adjuster acts purely as a mechanical stop to set the end-of-travel position, meaning it will not hold the load if air pressure is lost.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X155-40S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X155-40S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 155 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 SAIJ125X155-40S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×155 | 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 SAIJ125X155-40S Is Used
Variable End-Stop Tuning
Dial in the exact retract distance between 115 and 155 mm during machine commissioning to accommodate varying material thicknesses without physically swapping the actuator.
Heavy Product Changeover
Quickly readjust the rear stopper on a production line when switching between different product sizes, leveraging the 8590 N push force to move heavy pallets or fixtures.
Sensor-Verified Positioning
Utilize the integrated magnet with DMSE solid-state sensors to confirm end-of-stroke arrival, ensuring precise sequencing even after trimming the travel window.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X155-40S the Right Cylinder?
Select this 125 mm bore cylinder when your application requires substantial thrust—such as 8590 N push at 0.7 MPa—and a variable retract end-position for product changeovers, rather than relying on a fixed-stroke SAI cylinder and external stop blocks. If your force requirements are lower, a 100 mm bore provides 5497 N push at 0.7 MPa; if higher, a 160 mm bore yields 14074 N. For load-holding without live air pressure, this cylinder is insufficient; consider an SAIL pneumatic lock or BSAI clamp-lock cylinder instead.
As a dimensionally interchangeable ISO 15552 profile cylinder, it uses a PT G1/2 port and supports mountings from the reduced SAIJ set: Basic, FA, LB, TC, FTC, TCM1, and TCM2 (omitting FB, CA, CB, and CR). The 32 mm diameter carbon steel rod and M27x2 thread provide excellent rigidity, though long unsupported strokes still require external guide rails to prevent side-loading damage.
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 SAIJ125X155-40S FAQ
At 0.5 MPa, this 125 mm bore cylinder provides 6136 N of pull force and 6136 N of push force. At 0.7 MPa, the push force increases to 8590 N.
The rear adjuster screw acts as a mechanical stop that lets you shorten the 155 mm nominal stroke by up to 40 mm, creating a usable travel window of 115 to 155 mm. It only sets the end position and does not lock or hold the load without continuous air pressure.
Authorized Export Seller
Genuine AirTAC parts produced by AirTAC factory.
1-Year Warranty
Covers non-human-caused product damage.
Fast Dispatch
Standard models usually ship in 3-4 days.
Fast Reply
Most inquiries answered within 7-8 hours.
Related AirTAC SAI Cylinders
Request a Quote for Airtac SAIJ125 Adjustable Cylinder SAIJ125X155-40S
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.