Airtac SAIJ40 Adjustable Cylinder SAIJ40BX120-75
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX120-75 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 120mm 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
- Stroke120 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX120-75
The AirTAC SAIJ40X120-75 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that creates a 45-120 mm usable travel window. Delivering 628 N of push force at 0.5 MPa, it is built with a SUS304 stainless steel rod for superior corrosion resistance and features PT tapered ports.
The rear adjuster acts as a mechanical stop to fine-tune the retract end position during commissioning without adding external stops. This cylinder uses the reduced SAIJ mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2) and relies on standard variable air cushions for end-of-stroke deceleration.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX120-75 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX120-75 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 120 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 SAIJ40BX120-75
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×120 | 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 SAIJ40BX120-75 Is Used
Product Changeovers
Dial in the 45-120 mm travel window during format changes to accommodate different package sizes without mechanical rebuilds.
End-Stop Tuning
Fine-tune the retract position during machine commissioning to achieve exact sensor alignment and seating without external stopper blocks.
Sorting Diverters
Adjust the stroke on pneumatic diverters to vary the pusher depth for different product widths on the fly.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX120-75 the Right Cylinder?
Choose this 40 mm bore when you need 628 N push force at 0.5 MPa, stepping up from a 32 mm bore (402 N) if payload increases, or down from a 50 mm bore (982 N) to save space. The 75 mm adjustment range is ideal for product-size changeovers on a packaging line, letting you dial in the exact end-stop without swapping the cylinder.
Because this is a 120 mm stroke, side-load is minimal, but always guide the load externally. The rear adjuster is a travel stop, not a lock; it will not hold the load without live air. For position holding without pressure, use an AirTAC SAIL or BSAI cylinder. ISO 15552 replacement match: 40 mm bore, 120 mm stroke, 75 mm adjust, PT ports, SUS304 rod, no magnet.
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 SAIJ40BX120-75 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 trim the effective travel back by up to 75 mm from the 120 mm nominal stroke, creating a 45-120 mm usable window. It functions as a mechanical stop and does not lock the load without continuous air pressure.
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