Airtac SAIJ40 Adjustable Cylinder SAIJ40BX240-40
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX240-40 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 SAIJ40BX240-40
The AirTAC SAIJ40X240-40 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster. It provides a nominal 240 mm stroke with an adjustable travel window of 200 to 240 mm, allowing you to dial back the retract position by up to 40 mm during commissioning. This bore delivers 628 N of push force at 0.5 MPa and uses a PT tapered port.
Equipped with a SUS304 stainless steel rod, it offers excellent corrosion resistance for harsh environments. The extruded aluminum barrel includes sensor grooves on both sides, though this unit ships without a magnet. The rear adjuster acts purely as a mechanical stop to fine-tune the end position and deceleration, meaning it will not hold a load without live air pressure.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX240-40 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX240-40 |
|---|---|
| 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 SAIJ40BX240-40
| 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 SAIJ40BX240-40 Is Used
Machine Setup Calibration
Fine-tune the 200-240 mm travel window during initial commissioning to achieve exact end-positioning without machining custom spacers.
Product Size Changeover
Quickly adjust the retract stop by up to 40 mm to accommodate varying package lengths on a packaging line.
Variable End-Stop Forming
Dial in the precise stroke distance for light forming or pressing tasks where 628 N of force is sufficient.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX240-40 the Right Cylinder?
Choose this 40 mm bore when your application requires 628 N of thrust at 0.5 MPa but might need a step up to the 50 mm bore (982 N) for heavier loads. An adjustable stroke is preferred over a fixed SAI cylinder when you need variable end-stops for product changeovers or fine-tuning at setup, eliminating the need to swap cylinders or bolt on external stops. For load-holding without live pressure, consider the SAIL or BSAI series instead.
To match an ISO 15552 replacement, verify the 40 mm bore, 240 mm stroke, 40 mm adjustment, PT port thread, and standard mounting. SAIJ supports a reduced mounting set including Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting FB, CA, CB, and CR options. Because the stroke is 240 mm, ensure proper external guiding to prevent excessive side-load wear on 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 SAIJ40BX240-40 FAQ
At a 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 effective stroke from 240 mm down to 200 mm. It functions as a travel stop for end-position tuning and does not lock or hold the load without continuous air pressure.
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