Airtac SAIJ40 Adjustable Cylinder SAIJ40BX240-100
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX240-100 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 SAIJ40BX240-100
The AirTAC SAIJ40X240-100 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that permits an effective usable travel window of 140-240 mm. It delivers 628 N of pull force at 0.5 MPa and utilizes a PT tapered port thread. Equipped with a SUS304 stainless steel rod, it provides excellent corrosion resistance for harsher environments.
Because the adjuster acts solely as a mechanical stop on the retract end, it cannot hold a load without live air pressure. This model supports a speed range of 30-800 mm/s and includes variable air cushions at both ends to manage deceleration. The extruded aluminum barrel integrates sensor grooves on both sides, allowing for flexible mounting of CMSE or DMSE switches if a magnet is added later.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX240-100 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX240-100 |
|---|---|
| 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 SAIJ40BX240-100
| 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 SAIJ40BX240-100 Is Used
Variable End-Stop Tuning
Dial in the exact retract position from 140 to 240 mm during commissioning without swapping cylinders or adding external mechanical stops.
Product Changeover
Quickly adjust the stroke length on packaging lines handling different package sizes, ensuring precise positioning on the fly.
Deceleration Setup
Pair the 100 mm rear mechanical stop with the built-in variable air cushions to safely fine-tune end-of-stroke deceleration for moving loads.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX240-100 the Right Cylinder?
Choose this 40 mm bore when you need higher force than a 32 mm bore (345 N pull at 0.5 MPa) but want a more compact footprint than a 50 mm bore (825 N pull). The 100 mm adjustment range is ideal for machine setups requiring variable end-stops during product changeovers, avoiding the need to swap out a fixed-stroke SAI cylinder or bolt on external stops. For any load-holding requirements without continuous air pressure, this cylinder is not a lock; consider the SAIL or BSAI series instead. With a 240 mm stroke, ensure an external guide is used to prevent excessive side-loading on the rod. It is dimensionally interchangeable per ISO 15552 and uses the reduced SAIJ mounting set: Basic, FA, LB, TC, FTC, TCM1, and TCM2.
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 SAIJ40BX240-100 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 shorten the nominal 240 mm stroke by up to 100 mm, creating a usable travel window of 140-240 mm. The adjuster acts as a mechanical stop to set the end position and does not function as a load lock.
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