Airtac SAIJ40 Adjustable Cylinder SAIJ40BX120-50S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX120-50S 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 SAIJ40BX120-50S
The AirTAC SAIJ40X120-50-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster. It provides a 120 mm nominal stroke that can be dialed back by up to 50 mm, creating a usable 70-120 mm travel window for exact end-position tuning during commissioning. Delivering 628 N of push force at 0.5 MPa, it fits neatly into mid-range pneumatic setups.
This variant uses a SUS304 stainless steel piston rod for superior corrosion resistance and ships with a magnetic piston (-S) for position sensing. The extruded aluminum barrel includes sensor grooves on both sides, ready to accept AirTAC CMSE reed or DMSE electronic solid-state switches. It supports a reduced mounting set of Basic, FA, LB, TC, FTC, TCM1, and TCM2.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX120-50S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX120-50S |
|---|---|
| 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 SAIJ40BX120-50S
| 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 SAIJ40BX120-50S Is Used
Product Changeover
Dial in the 70-120 mm travel window during format size changes on packaging lines without physically swapping the cylinder.
End-Stop Calibration
Fine-tune the retract position at machine commissioning to perfect sensor triggering and mechanical endpoints.
Variable Positioning
Adjust the stroke on the fly for assembly stations handling multiple part lengths within the 120 mm limit.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX120-50S the Right Cylinder?
Choose this 40 mm bore when an application demands fine-tuning of the retract end without swapping components, offering a clear advantage over a fixed-stroke SAI cylinder. If your process requires less push force, stepping down to a 32 mm bore yields 402 N at 0.5 MPa; for heavier loads, a 50 mm bore provides 982 N. The 16 mm rod and M12x1.25 thread handle moderate side loads well, though long unsupported travel still needs an external guide.
When replacing an ISO 15552 cylinder, match the 40 mm bore, 120 mm stroke, 50 mm adjustment, PT tapered ports, and the -S magnet. Remember that the rear adjuster acts only as a travel stop and relies on air pressure; it is not a lock. For true load-holding without live air, consider an external rod lock, a pilot-operated check valve, or the AirTAC SAIL and BSAI series.
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 SAIJ40BX120-50S FAQ
The rear adjuster screw shortens the effective stroke by up to 50 mm. This gives the 120 mm nominal stroke a usable travel window of 70-120 mm, allowing you to set the exact retract position without adding external stops.
At 0.5 MPa it provides 628 N of push force and 528 N of pull force. At the maximum operating pressure of 1.0 MPa, the push force reaches 1130 N.
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