Airtac SAIJ40 Adjustable Cylinder SAIJ40BX155-30S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX155-30S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 155mm 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
- Stroke155 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX155-30S
The AirTAC SAIJ40X155-30-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, providing a usable travel window of 125 to 155 mm. Delivering 628 N of push force and 528 N of pull force at 0.5 MPa, it fits medium-duty applications perfectly. The PT tapered port thread and G1/4 air supply ensure a tight, leak-free pneumatic connection.
This specific SKU features a SUS304 stainless steel rod for superior corrosion resistance and includes a built-in magnet (-S) for seamless integration with AirTAC CMSE reed and DMSE electronic sensors. The rear adjuster acts purely as a mechanical stop to fine-tune the retract position, meaning it cannot hold a load without live air pressure.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX155-30S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX155-30S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 155 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 SAIJ40BX155-30S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×155 | 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 SAIJ40BX155-30S Is Used
Product Changeover
Dial in the exact retract distance within the 125-155 mm window when switching product sizes on a conveyor line, eliminating the need for physical spacer changes.
Commissioning Calibration
Fine-tune the end-stop during initial machine setup to perfect sensor alignment and tooling positions without disassembling the actuator.
Corrosive Assembly
Leverage the SUS304 stainless steel rod for precise, repeatable positioning in environments where standard carbon rods would degrade.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX155-30S the Right Cylinder?
Choose this adjustable-stroke model when your machine setup requires exact end-position tuning during commissioning or product changeover, avoiding the need to physically swap cylinders or bolt on external stops. If your application demands higher force, stepping up to the 50 mm bore yields 982 N of push force at 0.5 MPa; conversely, dropping to a 32 mm bore reduces it to 402 N.
For load-holding without continuous air pressure, this cylinder is insufficient since the rear adjuster and air cushions only decelerate travel rather than locking it. In those scenarios, consider an AirTAC SAIL or BSAI series cylinder. This SAIJ40X155-30-S variant is dimensionally interchangeable per ISO 15552 and utilizes a reduced mounting set of Basic, FA, LB, TC, FTC, TCM1, and TCM2.
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 SAIJ40BX155-30S FAQ
At a 0.5 MPa operating pressure, this 40 mm bore cylinder generates 628 N of push force and 528 N of pull force. At the maximum 1.0 MPa pressure, it can deliver up to 128 kgf.
The rear mechanical adjuster allows you to shorten the nominal 155 mm stroke by up to 30 mm, creating a usable travel window of 125 to 155 mm. It acts as a travel stop for end-position tuning and does not lock the load.
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