Airtac SAIJ40 Adjustable Cylinder SAIJ40BX120-10
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX120-10 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 SAIJ40BX120-10
The AirTAC SAIJ40X120-10 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to fine-tune the effective travel within a 110-120 mm window. Delivering 628N of push force at 0.5 MPa, it is equipped with a SUS304 stainless steel rod and tapered PT ports for reliable pneumatic performance.
The extruded aluminum barrel includes sensor grooves on both sides for flexible mounting of CMSE or DMSE switches. This adjustable model uses a reduced mounting set of Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting the FB, CA, CB, and CR options found on fixed variants.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX120-10 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX120-10 |
|---|---|
| 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 SAIJ40BX120-10
| 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 SAIJ40BX120-10 Is Used
Machine Commissioning
Dial in the exact 110-120mm end-stop during initial machine setup to perfect positioning without swapping cylinders.
Product Changeover
Quickly adjust the rear stopper by up to 10mm to accommodate slightly different product sizes on the same production line.
Variable End Stops
Achieve precise end-position tuning on automated equipment where a fixed 120mm stroke might leave minor mechanical gaps.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX120-10 the Right Cylinder?
Choose this 40mm bore cylinder when your application requires 628N of push force at 0.5 MPa. If your setup demands less force, you might step down to a 32mm bore providing 402N, or step up to a 50mm bore offering 982N for heavier loads. The 10mm rear adjuster is ideal for fine-tuning the end position during machine commissioning or product changeover without adding external stops.
For ISO 15552 replacement matching, verify the 40mm bore, 120mm stroke, 10mm adjustment range, G1/4 port with PT thread, and the required mounting accessory. Note that the rear adjuster acts only as a travel stop and does not hold the load without live air pressure; for fail-safe load holding, consider the SAIL or BSAI series. The 16mm rod and M12x1.25 thread handle side loads well, but for any stroke over 300mm, an external guide is recommended.
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 SAIJ40BX120-10 FAQ
At an operating pressure of 0.5 MPa, this 40mm bore cylinder provides 628N of push force and 528N of pull force. At the maximum pressure of 1.0 MPa, it delivers 128 kgf.
The rear external adjusting screw acts as a mechanical stopper, allowing you to shorten the effective travel from the nominal 120mm down to 110mm. This creates a 110-120mm usable travel window for fine-tuning without replacing the cylinder.
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