Airtac SAIJ125 Adjustable Cylinder SAIJ125AX115-50
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX115-50 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 115mm 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
- Stroke115 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX115-50
The AirTAC SAIJ125X115-50 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to trim the effective travel back by up to 50 mm. This creates a highly versatile 65-115 mm usable stroke window, enabling precise end-position tuning at commissioning or during product changeovers without swapping out the entire cylinder. Delivering 6136 N of push force at 0.5 MPa, it is built for heavy-duty positioning.
This model features a SUS420J2 stainless steel rod (option A) for improved corrosion resistance and utilizes PT tapered port threads. The extruded aluminum barrel includes sensor grooves on both sides, though this specific SKU is configured without a magnet. The rear adjustment mechanism acts purely as a travel stop to set deceleration endpoints, so it will not hold a load safely without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX115-50 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX115-50 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 115 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 SAIJ125AX115-50
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×115 | 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 SAIJ125AX115-50 Is Used
Variable End-Stop Positioning
Dial in the exact clamping depth for parts of varying heights using the 50 mm rear adjustment window, ensuring precise force application without repositioning the entire actuator assembly.
Machine Setup & Changeover
Rapidly reconfigure automated lines for new product runs by fine-tuning the cylinder's extended endpoint, eliminating the need to physically swap out actuators or bolt on external stoppers.
Heavy-Duty Forming Operations
Leverage the 6136 N push force at 0.5 MPa to execute robust pressing or forming tasks, relying on the adjustable stroke to compensate for material thickness variations.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX115-50 the Right Cylinder?
Select this 125 mm bore cylinder when an application requires substantial thrust—stepping down to an 80 mm bore drops the 0.5 MPa push force to 2513 N, whereas stepping up to a 160 mm bore yields 10053 N. The adjustable 65-115 mm travel window is chosen over a fixed-stroke SAI cylinder when machinery requires variable end-stops for different product sizes, allowing rapid setup changes without adding external physical stops.
Because the 115 mm stroke is relatively short, side-load stress is minimized, but the 32 mm rod diameter and M27x2 rod thread provide excellent rigidity for off-center loads. If the process requires the load to be physically locked in place during a complete air pressure loss, a standard SAIJ will not suffice; you should explore an AirTAC SAIL (pneumatic lock) or BSAI (clamp-lock) cylinder instead. This unit is dimensionally interchangeable per ISO 15552, features a PT port, and omits FB, CA, CB, and CR mounting options in favor of the Basic, FA, LB, TC, FTC, TCM1, and TCM2 set.
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 SAIJ125AX115-50 FAQ
The rear adjuster acts as a mechanical stop that lets you shorten the 115 mm nominal stroke by up to 50 mm, providing a usable travel window of 65 to 115 mm. It sets the deceleration endpoint but does not lock the load without continuous air pressure.
At 0.5 MPa, the SAIJ125X115-50 provides 6136 N of push force and 5734 N of pull force. It can achieve up to 8590 N of push force at 0.7 MPa, with a maximum operating pressure of 1.0 MPa.
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