Airtac SAIJ125 Adjustable Cylinder SAIJ125AX75-50S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX75-50S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 75mm 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
- Stroke75 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX75-50S
The AirTAC SAIJ125X75-50-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster. It provides a 25-75 mm usable travel window by allowing you to trim up to 50 mm from the 75 mm nominal stroke. In the 125 mm bore class, it delivers 6136 N of push force and 5734 N of pull force at 0.5 MPa. The integrated extruded aluminum barrel features sensor grooves on both sides, and because this unit includes a magnet (-S), it supports AirTAC CMSE reed and DMSE electronic solid-state switches for precise position feedback.
This variant uses a SUS420J2 stainless steel rod (material code A) for improved corrosion resistance compared to standard carbon steel. It features PT tapered port threads and operates at speeds between 30-500 mm/s. The rear adjuster acts purely as a travel stop to fine-tune end positions during commissioning; it does not hold the load without live air pressure. For applications requiring true load-holding, consider the SAIL or BSAI series instead.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX75-50S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX75-50S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 75 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 SAIJ125AX75-50S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×75 | 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 SAIJ125AX75-50S Is Used
Product Changeover
Dial in the 25-75 mm travel window on the fly to accommodate different package sizes on a packaging line without changing cylinders.
End-Stop Tuning
Fine-tune the retract end-position during machine commissioning to achieve exact clamping or pressing distances.
Heavy Forming
Leverage the 6136 N push force at 0.5 MPa for robust pressing or holding tasks while adjusting the stroke to suit die heights.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX75-50S the Right Cylinder?
Selecting this 125 mm bore model makes sense when your application requires the 6136 N push force at 0.5 MPa, which is a substantial step up from the 80 mm bore that provides 2513 N. If your force requirements are lower, dropping to an 80 mm bore saves space and air consumption. The 50 mm adjustment range is ideal for machine setups requiring variable end-stops or frequent product-size changeovers, eliminating the need to physically swap out a fixed-stroke SAI cylinder.
When specifying a replacement for an ISO 15552 cylinder, match the 125 mm bore, 75 mm stroke, 50 mm adjustment, PT G1/2 port, and the -S magnet requirement. Although the 75 mm stroke is short, the 32 mm rod diameter and M27x2 thread provide excellent rigidity. If your stroke was 300 mm or longer, you would need an external guide to prevent side-load damage, but this short stroke handles moderate side loads well. Mounting options are limited to the SAIJ subset: 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 SAIJ125AX75-50S FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. It can reach up to 11045 N push force at 0.9 MPa.
The rear adjuster allows you to shorten the effective travel from its 75 mm nominal stroke down to 25 mm, creating a 25-75 mm usable window. This stopper only sets the end position; it does not lock or hold the load without continuous air pressure.
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