Airtac SAIJ40 Adjustable Cylinder SAIJ40BX120-100
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX120-100 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 SAIJ40BX120-100
The AirTAC SAIJ40X120-100 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 dialed back by up to 100 mm, yielding a highly flexible 20-120 mm usable travel window for precise commissioning. Belonging to the 40 mm bore class, it delivers 879 N of push force at 0.7 MPa.
This configuration utilizes a SUS304 stainless steel rod (option B) for superior corrosion resistance and features PT tapered port threads. The extruded aluminum barrel includes sensor grooves on both sides, allowing for the direct mounting of CMSE reed or DMSE electronic switches if a magnet is added later. The rear stopper solely sets the travel end position and does not function as a load lock.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX120-100 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX120-100 |
|---|---|
| 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 SAIJ40BX120-100
| 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 SAIJ40BX120-100 Is Used
Product Changeovers
Dial in the 20-120 mm travel window during line format changes to accommodate varying package sizes without physically swapping the actuator.
Commissioning Calibration
Fine-tune the retract end-position at machine setup to perfect seating forces, avoiding the need to machine custom external spacers.
Variable End Stops
Establish precise mechanical limits for testing or assembly operations where the required stroke length may shift between different workpieces.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX120-100 the Right Cylinder?
Choose this 40 mm bore actuator when an application demands extreme stroke variability, as the 100 mm adjustment range allows the physical cylinder envelope to remain constant while the effective travel changes from 20 to 120 mm. If your setup requires less than 879 N of push force at 0.7 MPa, stepping down to a 32 mm bore yields 563 N; conversely, a 50 mm bore provides 1374 N for heavier loads. Because the nominal stroke is 120 mm, external side-load guides are not strictly necessary, but the 16 mm rod and M12x1.25 thread should be aligned properly during mounting.
An adjustable stroke is selected over a fixed SAI cylinder to fine-tune end positions during product changeovers without swapping hardware or adding external stops. Remember that the rear adjuster acts only as a travel stop; it will not hold a load without continuous air pressure. For true pneumatic locking, consider the SAIL or BSAI series. This SAIJ model uses a reduced mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2) and is dimensionally interchangeable per ISO 15552.
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 SAIJ40BX120-100 FAQ
Based on a 40 mm bore, this double-acting cylinder provides 628 N of push force and 528 N of pull force at 0.5 MPa. At 0.7 MPa, the push force increases to 879 N.
The rear adjuster screw allows you to trim the effective travel by up to 100 mm from the 120 mm nominal stroke, creating a 20-120 mm usable window. The adjuster acts as a mechanical stop and does not lock the load without live air pressure.
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