Airtac SAIJ40 Adjustable Cylinder SAIJ40BX125-50S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX125-50S 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 SAIJ40BX125-50S
The AirTAC SAIJ40X125-50-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It provides a nominal 125 mm stroke that can be fine-tuned down by up to 50 mm, giving you a precise usable travel window between 75 mm and 125 mm. Delivering 628 N of push force at 0.5 MPa, it handles mid-range actuation with ease. The integrated magnet supports position sensing, while the SUS304 stainless steel rod offers superior corrosion resistance.
This adjustable-stroke design allows you to dial in the exact retract end-position during commissioning or product changeovers without swapping the cylinder or adding external stops. The rear screw acts purely as a travel stop, not a lock, so the load is not held without live air pressure. It features a PT tapered port and variable air cushions at both ends to decelerate the piston smoothly.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX125-50S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX125-50S |
|---|---|
| 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 SAIJ40BX125-50S
| 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 SAIJ40BX125-50S Is Used
Product Changeover
Quickly reconfigure the 75-125 mm stroke window on packaging lines when switching to different carton sizes without changing the cylinder.
End-Position Tuning
Fine-tune the retract distance during machine commissioning to achieve exact material feeding alignment using the rear stopper screw.
Corrosive Assembly
Leverage the SUS304 stainless steel rod for actuation tasks in light manufacturing environments where moisture or minor corrosion is a concern.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX125-50S the Right Cylinder?
Choose this 40 mm bore when you need more power than a 32 mm cylinder (which provides 402 N push at 0.5 MPa) but want a more compact footprint than a 50 mm option (982 N). The 50 mm adjustment range is ideal for machines processing varying product sizes, letting you reconfigure the end-stop on the fly. For load-holding without continuous air pressure, you would need an external rod lock or a different series like SAIL or BSAI, as the SAIJ adjuster only sets the travel end.
To match this ISO 15552 replacement exactly, confirm the 40 mm bore, 125 mm nominal stroke, 50 mm maximum adjustment, PT G1/4 port, and the -S magnet option. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting FB, CA, CB, and CR. Since the stroke is under 300 mm, side-load stress is minimal, but always ensure the M12x1.25 rod thread is properly aligned with your load coupling.
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 SAIJ40BX125-50S FAQ
At 0.5 MPa operating pressure, this 40 mm bore cylinder provides 628 N of push force and 528 N of pull force. At 0.7 MPa, the push force increases to 879 N.
The rear adjuster screw lets you shorten the 125 mm nominal stroke by up to 50 mm, creating a usable travel window of 75 to 125 mm. This stopper sets the end position but does not lock the load without live air pressure.
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