Airtac SAIJ125 Adjustable Cylinder SAIJ125AX40-20
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX40-20 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 40mm 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
- Stroke40 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX40-20
The AirTAC SAIJ125X40-20 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, delivering a robust 6136N of push force at 0.5 MPa. By integrating a 20mm adjustment mechanism on a 40mm nominal stroke, this model provides a highly specific 20-40mm usable travel window, enabling exact end-position tuning during commissioning without external stops. The extruded aluminum barrel features dual sensor grooves, and the piston rod utilizes SUS420J2 stainless steel for superior corrosion resistance.
Operating at speeds of 30-500mm/s, this unit incorporates adjustable air cushions at both ends to manage impact deceleration. The rear adjuster functions strictly as a travel stop to set the retract position and does not lock the load; for dead-air position holding, SAIL or BSAI variants are required. It supports a reduced mounting set including Basic, FA, LB, TC, FTC, TCM1, and TCM2.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX40-20 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX40-20 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 40 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 SAIJ125AX40-20
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×40 | 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 SAIJ125AX40-20 Is Used
Variable End-Stop Tuning
Dial in the exact 20-40mm retract position during machine setup or product changeover without physically swapping cylinders or adding external shims.
Heavy Pressing Operations
Leverage the 6136N push force at 0.5 MPa for heavy-duty assembly and pressing tasks that require precise final position calibration.
Corrosion-Resistant Actuation
Utilize the SUS420J2 stainless steel rod option for industrial environments where moisture or minor splash requires enhanced material resistance.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX40-20 the Right Cylinder?
Selecting this 125mm bore yields 6136N push and 5734N pull forces at 0.5 MPa, making it ideal for heavy pressing or clamping. If your application requires less force, stepping down to an 80mm bore provides 2513N, whereas a 160mm bore offers 10053N for larger loads. The 20-40mm adjustable travel window is optimal for product changeovers where the exact end-of-stroke datum must be dialed in on the fly, replacing the need for fixed hard stops or swapping a standard SAI cylinder.
For ISO 15552 replacement matching, verify the 125mm bore, 40mm nominal stroke, 20mm adjustment range, PT tapered port thread, and the desired mounting bracket. Note that while the 32mm rod thread (M27x2) handles high side loads well, any stroke exceeding 300mm on larger bores necessitates an external guide rod to prevent premature seal wear.
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 SAIJ125AX40-20 FAQ
At an operating pressure of 0.5 MPa, this 125mm bore cylinder generates a push force of 6136N and a pull force of 5734N. The maximum force at 1.0 MPa is 1251 kgf.
The rear adjuster acts as a mechanical stop that allows you to trim the 40mm nominal stroke back by up to 20mm, creating a 20-40mm usable travel window. It sets the end position but does not lock the load without live air pressure.
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