Airtac SAIJ40 Adjustable Cylinder SAIJ40BX500-75
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX500-75 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 500mm 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
- Stroke500 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX500-75
The AirTAC SAIJ40X500-75 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that permits the 500 mm nominal travel to be dialed back by up to 75 mm, creating a precise 425-500 mm usable window for commissioning. Built with a SUS304 stainless steel rod and PT tapered ports, it delivers 628 N of push force at 0.5 MPa. The extruded aluminum barrel includes sensor grooves on both sides for flexible mounting of CMSE or DMSE switches.
Because the rear mechanism acts purely as a mechanical stop to set the end position and relies on the adjustable air cushions for deceleration, it cannot hold a load without live air pressure. For applications requiring true position holding, a SAIL or BSAI locking cylinder is recommended. The 16 mm rod and M12x1.25 thread provide robust durability, though the extended 500 mm stroke requires an external guide to prevent excessive side-loading on the rod.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX500-75 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX500-75 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 500 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 SAIJ40BX500-75
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×500 | 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 SAIJ40BX500-75 Is Used
Product Changeover
Dial in the 425-500 mm travel window during line format changes to accommodate different package lengths without replacing the actuator.
Variable End-Stop Positioning
Set precise retraction limits on extended conveyor sorting gates where fixed stops would require mechanical rework.
Commissioning Calibration
Fine-tune the final end-of-stroke position during machine setup to perfect timing and alignment without adding external spacers.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX500-75 the Right Cylinder?
Choose this 40 mm bore when a 32 mm bore (providing 402 N push at 0.5 MPa) is insufficient, but before stepping up to a 50 mm bore (982 N push at 0.5 MPa) to avoid oversized energy consumption. The SAIJ40X500-75 is selected over a fixed-stroke SAI cylinder when a machine requires variable end-stops or fine-tuning during product changeover without physically swapping the actuator.
When matching an ISO 15552 replacement, specify a 40 mm bore, 500 mm stroke, 75 mm adjustment range, PT port thread, SUS304 (B) rod material, and no magnet. Note that SAIJ supports a reduced mounting set including Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting the FB, CA, CB, and CR options. Because the stroke is 500 mm, an external guide must be used to manage side loads and protect the rod.
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 SAIJ40BX500-75 FAQ
At 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 can deliver up to 128 kgf.
The rear adjuster screw acts as a mechanical stop that shortens the 500 mm nominal stroke by up to 75 mm, providing a usable travel window of 425 to 500 mm. It sets the end position but does not lock the load without live air pressure.
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