Airtac SAIJ125 Adjustable Cylinder SAIJ125X170-40
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X170-40 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 170mm 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
- Stroke170 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X170-40
The AirTAC SAIJ125X170-40 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, delivering 6136N of thrust at 0.5 MPa. By turning the external stopper screw, you can trim the nominal 170mm travel back by up to 40mm. This creates a precise 130-170mm usable positioning window, allowing you to fine-tune the retract end-position during commissioning without swapping hardware.
This bore features a robust 32mm carbon steel rod with an M27x2 thread, paired with 40mm variable air cushions at both ends to absorb kinetic energy. The extruded aluminum barrel includes sensor grooves on both sides, though this specific SKU omits the magnet. If position feedback is required later, you must select a -S variant to utilize AirTAC CMSE reed or DMSE electronic solid-state switches.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X170-40 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X170-40 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 170 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 SAIJ125X170-40
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×170 | 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 SAIJ125X170-40 Is Used
Product Size Changeovers
Quickly dial the retract position back by up to 40mm when switching a packaging line to a smaller carton format, avoiding mechanical teardown.
End-Stop Calibration
Fine-tune the final resting position of a heavy press during machine commissioning to achieve exact contact alignment without external stops.
Variable Stroke Ejection
Adjust the kick-out distance of a heavy part ejector on the fly to accommodate varying material thicknesses in automated assembly.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X170-40 the Right Cylinder?
Choose this 125mm bore when a 63mm cylinder (providing 1559N push force at 0.5 MPa) cannot move your load, but an 80mm bore (2513N) is still undersized. The adjustable stroke is highly beneficial for machines processing multiple product sizes, as operators can dial in the exact end-stop on the fly instead of adding external shims. The rear adjuster acts purely as a travel stop and does not hold the load without live air; for dead-air load holding, consider an AirTAC SAIL pneumatic lock or an external rod lock.
For an exact ISO 15552 replacement match, verify the 125mm bore, 170mm nominal stroke, 40mm adjustment range, PT tapered port threads, and your preferred mounting accessory. SAIJ supports a specific mounting subset including Basic, FA, LB, TC, FTC, TCM1, and TCM2 brackets. Because the 170mm stroke is relatively short for this large bore, side-load risks are minimal, but an external guide remains recommended for heavy radial loads.
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 SAIJ125X170-40 FAQ
At 0.5 MPa operating pressure, this 125mm bore cylinder provides 6136N of push force and 5734N of pull force. It can reach a maximum push force of 11045N at 0.9 MPa.
The rear adjuster screw allows you to shorten the 170mm nominal stroke by up to 40mm, providing an effective travel window of 130-170mm. The adjuster serves as a mechanical stop to set the end position and does not lock the load without continuous air pressure.
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