Airtac SAIJ40 Adjustable Cylinder SAIJ40BX135-30
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX135-30 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 135mm 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
- Stroke135 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX135-30
The AirTAC SAIJ40X135-30 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to fine-tune the effective travel anywhere between 105 and 135 mm. Delivering 628 N of push force at 0.5 MPa, it is built with a SUS304 stainless steel rod for superior corrosion resistance in washdown or chemically exposed environments. The extruded aluminum barrel includes sensor grooves on both sides for flexible switch placement.
This model uses a PT tapered port thread for a tight pneumatic seal. The rear adjustment screw acts purely as a mechanical stop to decelerate the piston at the end of its retract stroke; it is not a locking mechanism and will not hold the load without live air pressure. For applications requiring true position holding, consider the SAIL or BSAI series.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX135-30 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX135-30 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 135 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 SAIJ40BX135-30
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×135 | 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 SAIJ40BX135-30 Is Used
Machine Commissioning
Dial in the exact retract end-position within the 105-135 mm window during initial setup without physically swapping cylinders or adding external stopper blocks.
Product Changeover
Quickly adjust the stroke length on packaging lines when handling different product sizes, reducing changeover time and keeping ISO 15552 mounting dimensions intact.
Corrosive Environments
Leverage the SUS304 stainless steel rod in light manufacturing or washdown areas where standard carbon steel rods would degrade, maintaining reliable 628 N push force.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX135-30 the Right Cylinder?
Choose this 40 mm bore when your application requires more thrust than the 32 mm version (402 N at 0.5 MPa) but lacks the space or air capacity for a 50 mm cylinder (982 N at 0.5 MPa). An adjustable stroke is ideal for machine setups requiring precise end-position tuning during commissioning or product changeovers, eliminating the need to swap out a fixed-stroke SAI cylinder. When integrating this ISO 15552 dimensionally interchangeable cylinder, specify the PT port thread, SUS304 (B) rod material, and a mounting option from the SAIJ subset: Basic, FA, LB, TC, FTC, TCM1, or TCM2. Because the 135 mm stroke is below the 300 mm side-load threshold, external guide rails are less critical, though the robust 16 mm rod and M12x1.25 thread naturally handle moderate bending loads.
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 SAIJ40BX135-30 FAQ
At a 0.5 MPa operating pressure, this 40 mm bore cylinder provides 628 N of push force and 528 N of pull force. At the maximum 1.0 MPa pressure, it delivers up to 128 kgf.
The rear adjuster screw allows you to mechanically shorten the nominal 135 mm stroke by up to 30 mm, creating a usable travel window of 105 to 135 mm. This stopper decelerates the piston at the retract end but does not lock the load without continuous air pressure.
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