Airtac SAIJ40 Adjustable Cylinder SAIJ40BX240-50S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX240-50S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 240mm 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
- Stroke240 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX240-50S
The AirTAC SAIJ40X240-50-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It provides a nominal 240 mm stroke that can be fine-tuned backward by up to 50 mm, creating a precise 190-240 mm usable travel window. Delivering 628 N of push force at 0.5 MPa, it fits perfectly into mid-range pneumatic setups. This variant features a SUS304 stainless steel rod for superior corrosion resistance and includes a magnet for position sensing.
Instead of machining external stops or swapping cylinders during product changeovers, technicians can turn the rear screw to dial in the exact end position. The extruded aluminum barrel includes sensor grooves on both sides, ready to accept CMSE reed or DMSE electronic switches. Remember that this rear adjuster acts purely as a travel stop to set deceleration, not as a lock to hold the load without live air pressure.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX240-50S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX240-50S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 240 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 SAIJ40BX240-50S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×240 | 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 SAIJ40BX240-50S Is Used
Product Changeover
Quickly dial the rear adjuster within the 190-240 mm window to accommodate different package lengths on a packaging line without changing hardware.
End-Position Tuning
Fine-tune the retract stroke during machine commissioning to achieve exact material press depths, preventing damage without adding external stopper blocks.
Variable Diverter Stops
Adjust the stopping point on the fly for conveyor systems handling varying product widths, using the SUS304 rod for durability in mildly corrosive environments.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX240-50S the Right Cylinder?
Select this 40 mm bore when an application requires 628 N push force at 0.5 MPa, but demands flexibility in the final end-position. If you need less force, stepping down to a 32 mm bore yields 402 N; stepping up to a 50 mm bore provides 982 N. The adjustable stroke is ideal for commissioning fine-tunes and accommodating multiple product sizes on a single line without replacing the cylinder. Because the nominal stroke is 240 mm, you should ensure adequate external guidance to prevent excessive side loading on the rod.
For a direct ISO 15552 replacement match, verify a 40 mm bore, 240 mm stroke, 50 mm adjustment range, PT tapered port threads, and the -S magnet option. Mounting choices are limited to the SAIJ subset: Basic, FA, LB, TC, FTC, TCM1, and TCM2 (omitting FB, CA, CB, and CR). If your process requires the load to be held mechanically without continuous air pressure, you must integrate an external rod lock or switch to a SAIL or BSAI cylinder model.
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 SAIJ40BX240-50S 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 allows you to shorten the effective travel from the nominal 240 mm down to 190 mm. This stopper sets the travel end and deceleration point but does not lock the load without live air pressure.
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