Airtac SAIJ125 Adjustable Cylinder SAIJ125X155-100S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X155-100S 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 SAIJ125X155-100S
The AirTAC SAIJ125X155-100-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, delivering 6136N of push force and 5734N of pull force at 0.5MPa. It features a carbon steel rod and a PT tapered port. Because this SKU carries a 100mm adjustment code, you can dial back the 155mm nominal stroke to create a highly flexible 55-155mm usable travel window. This wide tuning range is perfect for accommodating multiple product sizes on the same machine without physically swapping the actuator.
Unlike a fixed-stroke SAI, the external rear stopper lets you fine-tune the retract end-position precisely at commissioning. The extruded aluminum barrel includes sensor grooves on both sides, and this -S variant contains a magnet ready for AirTAC CMSE reed and DMSE electronic solid-state switches. Remember that the rear adjuster functions strictly as a travel stop, not a load-holding lock.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X155-100S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X155-100S |
|---|---|
| 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 SAIJ125X155-100S
| 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 SAIJ125X155-100S Is Used
Modular Product Lines
Set variable end-stops to handle multiple product lengths on a single conveyor line, adjusting the 55-155mm travel window rapidly during format changeovers.
Machine Commissioning
Dial in the exact retract position during setup using the rear stopper, avoiding the need to add external shims or swap out the entire ISO 15552 cylinder body.
Custom Assembly Fixtures
Fine-tune the stroke end-point on the fly to accommodate varying component heights, ensuring precise clamping without reprogramming the machine controller.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X155-100S the Right Cylinder?
Choose this 125mm bore when a 100mm bore (offering 3927N push at 0.5MPa) lacks the necessary thrust, but a 160mm bore (10053N at 0.5MPa) would be overkill. The 100mm adjustment range is selected when a single fixture requires sweeping variability across different product formats. If the machine only needs a fixed 155mm stroke, the standard SAI is the simpler choice. For true load-holding without continuous air pressure, step up to the SAIL or BSAI series, as the SAIJ adjuster cannot hold a suspended load. Dimensionally interchangeable per ISO 15552, this PT ported cylinder uses the reduced SAIJ mounting set: Basic, FA, LB, TC, FTC, TCM1, and TCM2.
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 SAIJ125X155-100S FAQ
At 0.5MPa operating pressure, this 125mm bore cylinder provides 6136N of push force and 5734N of pull force. At the maximum 1.0MPa pressure, it can deliver up to 1251 kgf.
The rear adjuster screw allows you to shorten the effective travel from the 155mm nominal stroke down to 55mm. This creates a 55-155mm usable window for fine-tuning end positions without changing the cylinder.
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