Airtac SAIJ40 Adjustable Cylinder SAIJ40BX240-40S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX240-40S 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 SAIJ40BX240-40S
The AirTAC SAIJ40X240-40-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to fine-tune the effective travel down by up to 40 mm. This yields a practical 200-240 mm adjustable stroke window, letting you dial in exact end positions at commissioning without swapping out the barrel or adding external stops. It delivers 628 N of push force and 528 N of pull force at 0.5 MPa.
This specific SKU is configured with a SUS304 stainless steel rod for superior corrosion resistance, a PT tapered port connection, and an integrated magnet for position sensing. The extruded aluminum barrel includes sensor grooves on both sides, directly supporting AirTAC CMSE reed and DMSE electronic solid-state switches. The SAIJ mounting set omits FB, CA, CB, and CR brackets, focusing on Basic, FA, LB, TC, FTC, TCM1, and TCM2 options.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX240-40S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX240-40S |
|---|---|
| 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 SAIJ40BX240-40S
| 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 SAIJ40BX240-40S Is Used
Product Changeover
Quickly adjust the 200-240 mm travel window during packaging line format changes without disassembling the cylinder mount.
Variable End-Stops
Set precise retract positions for multi-tier assembly machines that require slightly different stroke lengths per cycle.
Stainless Rod Operations
Leverage the SUS304 rod and fine-tuned travel for accurate end-positioning in environments requiring high corrosion resistance.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX240-40S the Right Cylinder?
Choose this 40 mm bore when your application requires the 628 N thrust class at 0.5 MPa but demands on-the-fly end-position tuning for product changeovers. If you need higher force, stepping up to the 50 mm bore yields 982 N push force, while dropping to a 32 mm bore reduces it to 402 N. Unlike a fixed-stroke SAI cylinder, this adjustable model uses a rear mechanical screw to set the travel limit, which is ideal for variable end-stops.
Because the nominal stroke is 240 mm, an external guide is recommended to prevent excessive side-loading on the 16 mm rod. Note that the rear adjuster acts purely as a travel stop and does not hold the load without live air pressure; for true drop-pressure load holding, select the SAIL or BSAI series. To match this exact configuration, ensure your ISO 15552 replacement specifies a 40 mm bore, 240 mm stroke, 40 mm adjustment range, PT ports, SUS304 rod, and 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 SAIJ40BX240-40S FAQ
It uses a rear external adjusting screw that lets you shorten the effective travel by up to 40 mm. This creates a usable 200-240 mm stroke window, allowing you to fine-tune the retract end position at commissioning without changing the cylinder.
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.
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