Airtac SAIJ40 Adjustable Cylinder SAIJ40BX240-75
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX240-75 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 240mm 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
- Stroke240 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX240-75
The AirTAC SAIJ40X240-75 is a double-acting, single-rod ISO 15552 profile cylinder engineered with a rear stroke adjuster. It provides a 165-240 mm usable travel window, allowing you to trim the effective stroke by up to 75 mm during commissioning without swapping hardware. Delivering 628 N of push force at 0.5 MPa, it bridges the gap between compact 32 mm units and mid-size 50 mm actuators.
This configuration features a SUS304 stainless steel rod for superior corrosion resistance and uses PT tapered port threads with a G1/4 connection. The extruded aluminum barrel includes sensor grooves on both sides for flexible switch placement. Mounting options include Basic, FA, LB, TC, FTC, TCM1, and TCM2, deliberately omitting FB, CA, CB, and CR brackets.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX240-75 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX240-75 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 240 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 SAIJ40BX240-75
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×240 | 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 SAIJ40BX240-75 Is Used
Machine Changeover
Rapidly reconfigure end-stops for different product lengths on a packaging line by dialing the rear screw within the 165-240 mm window.
Fixture Alignment
Fine-tune clamping positions during initial machine commissioning without fabricating custom spacer blocks or ordering non-standard cylinders.
Variable Product Diverter
Adjust the stroke of a diverting gate on the fly to handle varying package widths while maintaining consistent positioning.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX240-75 the Right Cylinder?
Select this 40 mm bore when an application requires precise end-position tuning on the fly, such as accommodating product size changes on a conveyor line. Instead of machining custom external stops or ordering a fixed-length SAI cylinder, the rear adjuster screw lets you dial in the exact 165-240 mm travel limit mechanically. If your setup needs 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.
Because the nominal stroke is 240 mm, ensure adequate guidance for any unsupported loads to prevent excessive side-loading on the M12x1.25 rod thread. The rear adjuster acts strictly as a travel stop and does not hold the load without live air pressure; for true pneumatic locking without continuous air, consider the SAIL or BSAI series. To match this exact unit, specify a 40 mm bore, 240 mm stroke, 75 mm adjustment, PT port, and no magnet.
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 SAIJ40BX240-75 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 0.7 MPa, the push force increases to 879 N.
The rear adjuster screw allows you to mechanically shorten the effective travel from the 240 mm nominal stroke down to as little as 165 mm. This stopper only sets the end position and does not lock the load without continuous air pressure.
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