Airtac SAIJ125 Adjustable Cylinder SAIJ125X45-20S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X45-20S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 45mm 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
- Stroke45 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X45-20S
The AirTAC SAIJ125X45-20-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers robust thrust, generating 6136 N of push force and 5734 N of pull force at 0.5 MPa. The integrated -S magnet enables position detection with AirTAC CMSE reed and DMSE electronic sensors housed in the dual-side barrel grooves.
This specific SKU features a 45 mm nominal stroke paired with a 20 mm adjustment range, creating a usable travel window of 25 to 45 mm. You can fine-tune the retract end-position at commissioning without installing external stops. The carbon steel piston rod features an M27x2 thread, and the cylinder operates at speeds between 30 and 500 mm/s.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X45-20S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X45-20S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 45 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 SAIJ125X45-20S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×45 | 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 SAIJ125X45-20S Is Used
Product Changeovers
Dial in the 25-45 mm travel window during format size changes without physically swapping the cylinder or adding external mechanical stops.
Heavy Clamping Forces
Leverage up to 6136 N of push force at 0.5 MPa for securing heavy workpieces, with the rear screw allowing precise clamp-position tuning.
End-Stop Calibration
Fine-tune the retract position during machine commissioning using the 20 mm adjustment range, ensuring perfect alignment before final lockdown.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X45-20S the Right Cylinder?
Select this 125 mm bore when an application requires heavy force that a 100 mm bore cannot provide, or when stepping down from a 160 mm bore to save space. At 0.5 MPa, the 100 mm bore yields 3927 N push force, whereas this 125 mm unit provides 6136 N. The adjustable stroke is ideal for product-size changeovers on a line, allowing the end-stop to be dialed back precisely by up to 20 mm.
Because the 45 mm stroke is well below the 300 mm threshold, external side-load guides are less critical here than with longer strokes, though the robust M27x2 rod thread handles substantial mechanical loads. Note that the rear adjuster acts only as a travel stop and does not hold the load without live air; for true load-holding without pneumatic pressure, consider an AirTAC SAIL or BSAI cylinder. This model uses PT tapered ports and supports Basic, FA, LB, TC, FTC, TCM1, and TCM2 mounts.
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 SAIJ125X45-20S FAQ
At 0.5 MPa, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. At 0.7 MPa, the push force increases to 8590 N. The operational speed range is 30-500 mm/s.
The rear adjuster screw allows you to shorten the 45 mm nominal stroke by up to 20 mm, providing a usable travel window of 25 to 45 mm. This stopper fine-tunes the end position but does not lock the load without continuous air pressure.
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