Airtac SAIJ125 Adjustable Cylinder SAIJ125X50-40S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X50-40S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 50mm 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
- Stroke50 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X50-40S
The AirTAC SAIJ125X50-40-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster. It provides a usable travel window of 10 to 50 mm, allowing you to dial back the nominal 50 mm stroke by up to 40 mm during commissioning without swapping hardware. In the 125 mm bore class, it delivers 6136 N of push force at 0.5 MPa.
This unit includes a standard carbon steel rod and a PT tapered port. The -S magnet enables position detection via AirTAC CMSE reed or DMSE electronic solid-state sensors. The rear adjuster acts purely as a travel stop for end-position tuning and does not lock the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X50-40S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X50-40S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 50 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 SAIJ125X50-40S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×50 | 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 SAIJ125X50-40S Is Used
Variable End-Stop Tuning
Dial the stroke back from 50 mm to 10 mm to set precise end positions for varying product sizes without adding external stopper blocks to the machine frame.
Heavy Assembly Changeover
Leverage the 6136 N push force to move heavy pallets while adjusting the 40 mm travel window on the fly during production line format changes.
Sensor-Verified Positioning
Utilize the integrated -S magnet with DMSE electronic sensors to confirm the adjusted stroke end across multiple customized assembly fixtures.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X50-40S the Right Cylinder?
Choose this 125 mm bore cylinder when an application requires heavy thrust (6136 N at 0.5 MPa) alongside frequent product-size changeovers. If your force requirements are lower, stepping down to an 80 mm bore yields 2513 N of push force. The adjustable 10 to 50 mm window is ideal for fine-tuning end stops at setup, whereas a fixed SAI cylinder requires external shims for modifications. For holding loads dynamically without air, select a SAIL or BSAI series instead.
Dimensionally interchangeable per ISO 15552, this model uses a PT port, carbon steel rod, and -S magnet. It supports a reduced mounting set of Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting FB, CA, CB, and CR. Operating speed is 30-500 mm/s.
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 SAIJ125X50-40S FAQ
At an operating pressure of 0.5 MPa, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. It can reach up to 1251 kgf at its maximum 1.0 MPa pressure.
The rear adjusting screw lets you shorten the effective travel from its 50 mm nominal stroke down to 10 mm. This creates a 10-50 mm usable window for fine-tuning end positions at commissioning, but the screw acts only as a stop and does not lock the load without live air.
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