Airtac SAIJ40 Adjustable Cylinder SAIJ40BX40-40S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX40-40S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 40mm 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
- Stroke40 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX40-40S
The AirTAC SAIJ40X40-40-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, allowing you to dial back the nominal 40 mm travel by up to 40 mm. This creates a highly versatile 0-40 mm usable window, perfect for applications requiring exact end-position tuning without swapping hardware. It delivers 628 N of push force at 0.5 MPa and operates at speeds between 30 and 800 mm/s.
This specific configuration features a SUS304 stainless steel rod for superior corrosion resistance and includes a magnet for use with AirTAC CMSE reed and DMSE electronic sensors. The extruded aluminum barrel includes sensor grooves on both sides, and the G1/4 port ensures efficient airflow for rapid cycling.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX40-40S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX40-40S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 40 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 SAIJ40BX40-40S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×40 | 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 SAIJ40BX40-40S Is Used
Precision Positioning
Dial in the exact 0-40 mm end-stop during machine commissioning to guarantee precise component placement without physical hardware changes.
Product Changeover
Quickly adjust the cylinder's effective stroke on the line when switching between product sizes, minimizing downtime and maximizing flexibility.
Clamp Calibration
Fine-tune the clamping depth on delicate workpieces to prevent crushing, relying on the rear stopper to set the exact travel limit.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX40-40S the Right Cylinder?
Choose this adjustable model when your setup requires precise mechanical end-stop calibration during commissioning or frequent product changeovers, avoiding the need to bolt on external stops. If your application requires less force, stepping down to a 32 mm bore yields 402 N at 0.5 MPa; stepping up to a 50 mm bore provides 982 N. Remember that the rear adjuster functions strictly as a travel stop and does not hold the load without live air—for secure load-holding, consider an external rod lock or the AirTAC SAIL series.
When replacing an ISO 15552 cylinder, match the 40 mm bore, 40 mm stroke, 40 mm adjustment range, PT port thread, and -S magnet requirement. The SAIJ supports a reduced mounting set including Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting FB, CA, CB, and CR options.
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 SAIJ40BX40-40S FAQ
At an operating pressure of 0.5 MPa, this 40 mm bore cylinder provides 628 N of push force and 528 N of pull force. At 0.7 MPa, the push force increases to 879 N.
The rear adjuster acts as a mechanical stop that allows you to trim the effective stroke by up to 40 mm from the nominal 40 mm length, providing a usable travel window of 0-40 mm. It is a travel stop, not a lock, and requires live air to hold position.
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