Airtac SAIJ125 Adjustable Cylinder SAIJ125X120-75S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X120-75S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 120mm 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
- Stroke120 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X120-75S
The AirTAC SAIJ125X120-75-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, delivering 6136N of push force at 0.5 MPa. Featuring a carbon steel rod and a PT tapered port, it provides a usable travel window of 45 to 120 mm. This wide adjustment range allows operators to dial in the exact retract end-position during commissioning without swapping hardware.
Because this SKU includes the -S magnet option, it directly supports AirTAC CMSE reed and DMSE electronic solid-state sensors housed within the dual-side sensor grooves. The rear stopper screw acts purely as a travel limit and works in tandem with the standard variable air cushions to decelerate the load. It does not function as a lock, meaning live air pressure is required to hold position. Mounting options include Basic, FA, LB, TC, FTC, TCM1, and TCM2.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X120-75S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X120-75S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 120 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 SAIJ125X120-75S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×120 | 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 SAIJ125X120-75S Is Used
Product Changeovers
Quickly reconfigure the 45 to 120 mm travel window on packaging lines to accommodate different carton or part sizes without changing the cylinder.
Commissioning Calibration
Fine-tune the retract end-position during machine setup to perfect alignment and avoid mechanical hard stops, preventing damage to tooling.
High-Force Positioning
Leverage the 6136N push force to move heavy pallets or fixtures, relying on the 32 mm rod to handle demanding industrial positioning tasks.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X120-75S the Right Cylinder?
Selecting this 125 mm bore makes sense when an application demands high thrust but variable end-stops, such as accommodating multiple product sizes on a single line. If 6136N at 0.5 MPa is excessive, stepping down to the 100 mm bore yields 3927N. Conversely, if greater pull force is needed, the 160 mm bore provides 9425N. For this adjustable model, the 75 mm trim range replaces the need to inventory multiple fixed-stroke SAI cylinders.
When integrating this cylinder, verify the exact replacement parameters: 125 mm bore, 120 mm nominal stroke, 75 mm adjustment, PT port thread, and the -S magnet. The 32 mm rod and M27x2 thread provide robust resistance to side loads, though any stroke exceeding 300 mm on larger setups would necessitate an external guide. For applications requiring true load-holding without continuous air pressure, consider the SAIL or BSAI series instead of relying on the adjuster.
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 SAIJ125X120-75S FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder generates 6136N of push force and 5734N of pull force. At the maximum 1.0 MPa pressure, it can deliver up to 1251 kgf.
The rear adjuster screw allows you to mechanically shorten the effective stroke by up to 75 mm from the nominal 120 mm, providing a usable travel window of 45 to 120 mm. This stopper only limits travel and does not lock the load without air pressure.
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