Airtac SAIJ125 Adjustable Cylinder SAIJ125AX140-20S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX140-20S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 140mm 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
- Stroke140 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX140-20S
The AirTAC SAIJ125X140-20-S is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It delivers 6136 N of push force at 0.5 MPa and provides a usable travel window of 120 to 140 mm, allowing you to dial back the nominal 140 mm stroke by up to 20 mm during commissioning. This built-in adjustability eliminates the need to swap cylinders or bolt on external stops when fine-tuning end positions.
This variant is equipped with a SUS420J2 stainless steel rod (material code A) for improved corrosion resistance and includes a piston magnet (-S) for position sensing. The extruded aluminum barrel features sensor grooves on both sides, supporting AirTAC CMSE reed and DMSE electronic solid-state switches. It operates at speeds from 30 to 500 mm/s and uses PT tapered G1/2 ports.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX140-20S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX140-20S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 140 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 SAIJ125AX140-20S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×140 | 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 SAIJ125AX140-20S Is Used
Machine Setup & Changeover
Fine-tune the 120-140 mm travel window during product line changeovers to accommodate different package sizes without physically swapping out the actuator.
Variable End Stops
Dial in the exact retract position during commissioning using the 20 mm rear adjustment screw, perfect for applications requiring precise end-of-stroke positioning without external stopper blocks.
Heavy-Duty Forming
Leverage the 6136 N push force at 0.5 MPa (up to 11045 N at 0.9 MPa) for pressing, clamping, or forming operations where the final position must be micro-adjusted on the fly.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX140-20S the Right Cylinder?
Choose this 125 mm bore when an application requires substantial thrust—stepping down to an 80 mm bore drops the 0.5 MPa push force to 2513 N, while a 100 mm bore offers 3927 N. The adjustable rear stopper is ideal for machine setups requiring variable end stops or product-size changeovers, providing precise end-position tuning without the rigid fixed stroke of a standard SAI cylinder. Because the 140 mm stroke is relatively short, side-load risks are minimal, though external guides are always recommended for heavy lateral loads.
For ISO 15552 replacement matching, ensure the original bore is 125 mm, stroke 140 mm, adjustment range 20 mm, G1/2 ports, and the required mounting accessory from the SAIJ set: Basic, FA, LB, TC, FTC, TCM1, or TCM2 (this series omits FB, CA, CB, and CR mounts). Note that the rear adjuster and air cushions only decelerate the load at travel ends; they do not hold the load without live air. For true load-holding without pneumatic pressure, consider an AirTAC SAIL or BSAI cylinder, or an external rod lock.
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 SAIJ125AX140-20S FAQ
The rear adjuster acts as an external mechanical stop that lets you shorten the effective stroke by up to 20 mm, creating a usable travel window of 120 to 140 mm. It allows fine-tuning of the retract end position without replacing the cylinder, though it only stops travel—it does not lock or hold the load without live air pressure.
At 0.5 MPa, it provides 6136 N of push force and 5734 N of pull force. If higher pressure is utilized, it can deliver up to 8590 N at 0.7 MPa and 11045 N at 0.9 MPa.
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