Airtac SAIJ125 Adjustable Cylinder SAIJ125X75-50S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X75-50S 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 SAIJ125X75-50S
The AirTAC SAIJ125X75-50-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, allowing you to dial back the nominal 75 mm travel to a specific 25-75 mm usable window. Built with a carbon steel rod and a PT tapered port, it delivers a robust 6136 N pull force at 0.5 MPa, making it well-suited for heavy material handling. The extruded aluminum barrel features sensor grooves on both sides to accommodate CMSE reed and DMSE solid-state switches.
This adjustable variant uses a reduced mounting set comprising Basic, FA, LB, TC, FTC, TCM1, and TCM2, deliberately omitting FB, CA, CB, and CR brackets. The rear adjuster functions purely as a travel stop for end-position tuning during commissioning, not as a lock, meaning live air pressure is required to hold the load in place.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X75-50S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X75-50S |
|---|---|
| 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 SAIJ125X75-50S
| 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 SAIJ125X75-50S Is Used
Variable End-Stop Machining
Fine-tune the 25-75 mm stroke window during machine setup to dial in the exact clamping position for different workpiece lengths without changing the cylinder.
Product Changeover Lines
Quickly adjust the rear stopper on the fly to accommodate varying package sizes on a packaging conveyor, reducing downtime between production runs.
Position Calibration
Use the 50 mm adjustment range to compensate for mechanical wear or sensor drift over time, ensuring the end-of-stroke position remains perfectly accurate.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X75-50S the Right Cylinder?
Choose this 125 mm bore when your application requires substantial thrust, such as 6136 N pull at 0.5 MPa, but you need flexibility in the exact end-of-stroke position. If your force requirements are lower, stepping down to an 80 mm bore yields 2268 N pull at 0.5 MPa, whereas moving up to a 160 mm bore provides 9425 N pull. The 50 mm adjustment range is ideal for production lines running multiple product sizes, allowing you to reposition the stopper quickly instead of physically swapping out a fixed-stroke SAI cylinder.
For load-holding without continuous air pressure, this cylinder cannot maintain its position on its own since the adjuster is a stop rather than a brake; you would need to explore an SAIL air-released lock or a BSAI clamp-lock variant. Because the total stroke is under 300 mm, side-load stress on the 32 mm rod is manageable without an external guide, though standard alignment practices should still be followed.
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 SAIJ125X75-50S FAQ
At a 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136 N of pull force and 8590 N of push force. It can reach a maximum push force of 11045 N at 0.9 MPa.
The rear adjuster acts as a mechanical stop that lets you shorten the 75 mm nominal stroke by up to 50 mm, creating a usable travel window of 25 to 75 mm. It is a travel stop for fine-tuning, not a lock, so live air is required to hold the load.
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