Airtac SAIJ40 Adjustable Cylinder SAIJ40BX400-75
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX400-75 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 400mm 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
- Stroke400 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX400-75
The AirTAC SAIJ40X400-75 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to fine-tune the effective travel window from 325 to 400 mm. Delivering 628 N of push force and 528 N of pull force at 0.5 MPa, it is built with a SUS304 stainless steel rod for superior corrosion resistance. The extruded aluminum barrel includes sensor grooves on both sides for straightforward position feedback integration.
This model uses a PT tapered G1/4 port and offers variable air cushions at both ends to manage deceleration. The rear stopper screw lets you dial in the exact end-position during commissioning or product changeovers without swapping out the entire cylinder. Note that this rear adjuster functions strictly as a travel stop and does not hold the load without live air pressure.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX400-75 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX400-75 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 400 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 SAIJ40BX400-75
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×400 | 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 SAIJ40BX400-75 Is Used
Product Changeover Adjustment
Quickly dial the stroke back by up to 75 mm during packaging line format changes to accommodate different carton sizes without changing hardware.
End-Position Tuning
Fine-tune the exact retract end-position during machine commissioning to perfect a pressing operation, avoiding the need for external mechanical stops.
Variable Diverter Stroke
Adjust the travel window between 325 and 400 mm on a conveyor sorting station to handle varying package depths on the fly.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX400-75 the Right Cylinder?
Choose this 40 mm bore when your application requires moderate thrust, such as 628 N push at 0.5 MPa, but stepping down to a 32 mm bore would leave you with only 402 N. The 75 mm adjustment range is ideal for machinery that frequently processes varying product sizes, allowing you to set variable end-stops on the fly instead of relying on fixed-stroke SAI cylinders. Because the nominal stroke is 400 mm, an external guide is recommended to prevent excessive side-loading on the extended rod.
For true load-holding without continuous air pressure, this cylinder will not suffice as the rear adjuster is only a stop; you would need to specify a SAIL (air-released lock) or BSAI (clamp-lock) variant instead. This SAIJ model is dimensionally interchangeable per ISO 15552 and uses a reduced mounting set including Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting FB, CA, CB, and CR options. As specified, it lacks a magnet for sensors.
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 SAIJ40BX400-75 FAQ
The rear adjuster screw acts as a mechanical stop that lets you shorten the effective stroke by up to 75 mm, providing a usable travel window of 325 to 400 mm. It only sets the travel end and does not lock or hold the load without live air pressure.
At 0.5 MPa operating pressure, this 40 mm bore cylinder provides 628 N of push force and 528 N of pull force. It can deliver up to 1130 N of push force at 0.9 MPa.
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