Airtac SAIJ40 Adjustable Cylinder SAIJ40BX125-20
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX125-20 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 125mm stroke, G1/4 air ports and adjustable end cushioning. Its standardized mounting interface makes it a drop-in replacement for other ISO 15552 cylinders in automation lines.
- BoreØ40 mm
- Stroke125 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX125-20
The AirTAC SAIJ40X125-20 is a double-acting, single-rod ISO 15552 profile cylinder featuring a rear stroke adjuster. It provides a usable travel window of 105-125 mm, allowing you to dial back the 125 mm nominal stroke by up to 20 mm during commissioning. Delivering 628 N of push force at 0.5 MPa, it suits medium-duty handling tasks.
This variant uses a SUS304 stainless steel rod for superior corrosion resistance and operates at speeds of 30-800 mm/s. The extruded aluminum barrel includes sensor grooves on both sides, though this unit is specified without a magnet. The rear adjuster acts purely as a travel stop and does not hold the load without live air pressure.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX125-20 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX125-20 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 125 mm |
| Acting type | Double acting |
| Port size | G1/4 |
| Rod thread | M12×1.25 |
| 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 – 800 mm/s |
| Cushion | Adjustable, 30 mm |
| Max stroke | Up to 1200 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 (Ø40mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 628 N | 528 N |
| 0.7 MPa | 880 N | — |
| Max (@1.0 MPa) | 128 kgf | |
Actual usable force is lower than theoretical due to friction and back-pressure. Size with a safety margin.
Model Code: Airtac SAIJ40 Adjustable Cylinder SAIJ40BX125-20
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×125 | 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 SAIJ40 Adjustable Cylinder SAIJ40BX125-20 Is Used
Machine Changeover
Dial in the 105-125 mm travel window during product size transitions to set precise retract endpoints without changing the cylinder.
Adjustable Diverters
Fine-tune the actuation distance on packaging lines to accommodate varying carton lengths on the fly.
End-Stop Calibration
Use the 20 mm rear adjustment screw to perfect the final retract position during initial machine commissioning.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX125-20 the Right Cylinder?
Choose this 40 mm bore cylinder when an application requires fine end-position tuning without swapping components or adding external stops. If your process demands higher force, stepping up to the 50 mm bore yields 982 N of push at 0.5 MPa. For lighter duties, the 32 mm bore provides 402 N. Since the nominal stroke is 125 mm, an external guide is not strictly required, but the M12x1.25 rod thread handles moderate side loads well.
The rear adjuster and variable air cushions manage end-of-stroke deceleration but are not brakes. For load-holding without continuous air pressure, consider the SAIL or BSAI series. This model features PT tapered port threads and the standard SAIJ mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2), omitting FB, CA, CB, and CR options. It is dimensionally interchangeable per ISO 15552.
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 SAIJ40 Adjustable Cylinder SAIJ40BX125-20 FAQ
At 0.5 MPa, this 40 mm bore cylinder provides 628 N of push force and 528 N of pull force. At the maximum operating pressure of 1.0 MPa, it delivers up to 128 kgf.
The rear adjuster screw lets you shorten the 125 mm nominal stroke by up to 20 mm, creating a 105-125 mm usable travel window. It functions as a mechanical stop for end-position tuning and does not lock the load without live air.
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