Airtac SAIJ125 Adjustable Cylinder SAIJ125AX140-20
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX140-20 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 SAIJ125AX140-20
The AirTAC SAIJ125X140-20 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that creates a 120-140 mm usable travel window. Delivering 6136 N of push force at 0.5 MPa, it handles heavy loads with a 32 mm rod and M27x2 thread. This bore operates at 30-500 mm/s and includes 40 mm variable air cushions at both ends.
The -20 mm adjustment screw lets you fine-tune the retract end position during commissioning or product changeover without swapping the cylinder. This SKU features a SUS420J2 stainless steel rod (code A) for corrosion resistance and PT tapered ports. It uses a reduced mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2) and omits FB, CA, CB, and CR options.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX140-20 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX140-20 |
|---|---|
| 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 SAIJ125AX140-20
| 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 SAIJ125AX140-20 Is Used
Variable End-Stop Positioning
Dial in the 120-140 mm travel window during machine setup to hit exact retract positions for different product heights without adding external stopper blocks.
Heavy Product Changeover
Leverage the 6136 N pull force and 20 mm adjuster to quickly reconfigure assembly lines for new pallet sizes, saving downtime on physical cylinder swaps.
Press and Staging Operations
Use the robust 32 mm rod and M27x2 thread to handle high side-loads during heavy staging, relying on the 40 mm air cushions to soften the impact at the travel ends.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX140-20 the Right Cylinder?
Choose this 125 mm bore when a 100 mm bore (3927 N push at 0.5 MPa) lacks the thrust for heavy positioning tasks, but step up to a 160 mm bore (10053 N) for larger press loads. Select the SAIJ adjustable-stroke variant over a fixed SAI when a machine requires variable end-stops to accommodate different product sizes on a single line. To match this ISO 15552 replacement, specify the 125 mm bore, 140 mm stroke, 20 mm adjustment, PT G1/2 port, and mounting style. Because the nominal stroke is 140 mm, side-load risks are minimal, but an external guide is still recommended for heavy off-center loads.
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 SAIJ125AX140-20 FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. At the maximum 1.0 MPa pressure, it delivers up to 1251 kgf.
The rear adjuster screw acts as a mechanical stop that lets you shorten the effective stroke by up to 20 mm, creating a 120-140 mm usable travel window. It only sets the end position and does not lock the load without live air pressure.
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