Airtac SAIJ40 Adjustable Cylinder SAIJ40BX500-75S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX500-75S 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 SAIJ40BX500-75S
The AirTAC SAIJ40X500-75-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers 628N of push force at 0.5 MPa and features a 500mm nominal stroke that can be fine-tuned down by up to 75mm, providing a usable travel window of 425-500mm. This built-in adjustability allows precise end-position tuning during commissioning without swapping the cylinder or adding external stops.
Configured with a SUS304 stainless steel rod (code B) and a magnet for position sensing, this model supports AirTAC CMSE reed and DMSE electronic switches via the dual sensor grooves on its extruded aluminum barrel. The PT tapered port is G1/4, and the rod thread is M12x1.25. The rear adjuster acts strictly as a travel stop for deceleration alongside the variable air cushions, meaning it will not hold a load without continuous live air pressure.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX500-75S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX500-75S |
|---|---|
| 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 SAIJ40BX500-75S
| 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 SAIJ40BX500-75S Is Used
Product Size Changeover
Dial in the 425-500mm travel window during format changes on a packaging line, using the rear stopper to quickly set new end positions without changing hardware.
Machine Commissioning
Fine-tune the exact end-of-stroke position during setup to perfect a 628N press fit, avoiding the need to machine custom external spacers.
Variable End-Stop Diverter
Adjust the retract position on the fly for a conveyor sorting arm to handle different package lengths without reprogramming the pneumatic valves.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX500-75S the Right Cylinder?
Choose this 40mm bore when an application requires approximately 628N push or 528N pull force at 0.5 MPa, stepping up from a 32mm bore (402N push) or down from a 63mm bore (1559N push). An adjustable stroke is ideal for machine setups requiring variable end-stops or frequent product-size changeovers, offering more flexibility than a fixed-stroke SAI cylinder. Because the nominal stroke is 500mm, the M12x1.25 rod is highly susceptible to side-loading, so an external guide rail must be used to prevent premature seal wear.
For a true ISO 15552 replacement match, verify the 40mm bore, 500mm stroke, 75mm adjustment range, PT G1/4 port, and the -S magnet option. Mounting choices are limited to the SAIJ subset: Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting the FB, CA, CB, and CR brackets. If the machine requires true load-holding without live air, this cylinder is insufficient; consider an AirTAC SAIL or BSAI locking cylinder instead.
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 SAIJ40BX500-75S FAQ
At 0.5 MPa operating pressure, this 40mm bore cylinder provides 628N of push force and 528N of pull force. At 0.7 MPa, the push force increases to 879N.
The rear adjuster screw lets you shorten the 500mm nominal stroke by up to 75mm, creating a 425-500mm usable travel window. It functions as a mechanical stop to set the end position and does not lock the load without live air.
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