Airtac SAIJ40 Adjustable Cylinder SAIJ40BX120-40
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX120-40 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 SAIJ40BX120-40
The AirTAC SAIJ40X120-40 is a double-acting, single-rod ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a nominal 120 mm stroke that can be fine-tuned backward by up to 40 mm, creating a usable travel window of 80 to 120 mm. Delivering 879 N of push force at 0.7 MPa, it fits neatly into mid-range pneumatic setups requiring precise end-positioning without external stops.
This configuration uses a SUS304 stainless steel rod for superior corrosion resistance and features PT tapered port threads. The extruded aluminum barrel includes sensor grooves on both sides for flexible mounting of CMSE reed or DMSE electronic switches. The rear adjuster acts purely as a mechanical stop to set the travel end and does not hold the load without live air pressure.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX120-40 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX120-40 |
|---|---|
| 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 SAIJ40BX120-40
| 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 SAIJ40BX120-40 Is Used
Product Size Changeovers
Dial in the 80-120 mm travel window during format changes on packaging lines, using the rear stopper to set exact end positions without replacing the actuator.
Machine Commissioning
Fine-tune the retract end-position at startup to clear mechanical interference, leveraging the 40 mm adjustment range instead of adding external stop blocks.
Variable End-Stop Clamping
Clamp parts of varying widths by adjusting the stroke back from 120 mm, using the 628 N push force at 0.5 MPa to secure components reliably.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX120-40 the Right Cylinder?
Choose this 40 mm bore when your application demands roughly 879 N of thrust at 0.7 MPa, stepping up from the 32 mm bore (402 N push) for greater force, or down from the 50 mm bore (1374 N push) to save space. The 40 mm adjustment range is ideal for product changeovers on a line, allowing you to dial in the exact end-stop without swapping the cylinder. If you need to hold a load without continuous air pressure, use a SAIL or BSAI cylinder instead, as the SAIJ adjuster is a stop, not a lock.
To replace this cylinder, match the 40 mm bore, 120 mm stroke, 40 mm adjustment, PT port threads, and SUS304 (B) rod material. It supports a reduced mounting set of Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting FB, CA, CB, and CR. Because the 120 mm stroke is under 300 mm, side-load concerns are minimal, though the 16 mm rod and M12x1.25 thread handle standard loads well.
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 SAIJ40BX120-40 FAQ
At 0.7 MPa it provides 879 N of push force and 528 N of pull force. The operational speed range is 30-800 mm/s, supported by 30 mm air cushions at both ends.
The rear adjuster screw lets you shorten the 120 mm nominal stroke by up to 40 mm, providing a usable travel window of 80 to 120 mm. It functions as a mechanical stop and does not lock or hold the load without live air pressure.
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