Airtac SAIJ40 Adjustable Cylinder SAIJ40BX240-20
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX240-20 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 SAIJ40BX240-20
The AirTAC SAIJ40X240-20 is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It provides a nominal 240 mm stroke that can be fine-tuned down by up to 20 mm, creating a precise 220-240 mm usable travel window for commissioning without external stops. Delivering 628 N of push force at 0.5 MPa, it handles moderate loads efficiently.
This variant features a SUS304 stainless steel rod for superior corrosion resistance and uses PT tapered port threads. The extruded aluminum barrel includes sensor grooves on both sides, allowing you to add CMSE reed or DMSE electronic sensors if needed. Mounting options include Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting FB, CA, CB, and CR.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX240-20 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX240-20 |
|---|---|
| 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 SAIJ40BX240-20
| 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 SAIJ40BX240-20 Is Used
Machine Setup Calibration
Fine-tune the 220-240 mm travel window during initial commissioning to achieve perfect end-positioning without machining new hard stops.
Product Size Changeover
Quickly adjust the retract distance on packaging lines when switching between different product sizes, minimizing downtime.
Variable End-Stop Positioning
Use the rear screw to set precise deceleration points for assembly tools that require slight travel modifications between batches.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX240-20 the Right Cylinder?
Choose this 40 mm bore when you need more power than the 32 mm version (402 N push at 0.5 MPa) but want a smaller footprint than the 50 mm option (982 N). The adjustable stroke is perfect for product changeovers, letting you dial in the exact end position without swapping the cylinder. Since the rear adjuster acts only as a travel stop and the air cushion provides deceleration, neither will hold a load without live air; for position holding, consider an external rod lock or the SAIL series.
When replacing an ISO 15552 cylinder, match the 40 mm bore, 240 mm stroke, 20 mm adjustment, PT G1/4 port, and mounting style. Because the stroke is 240 mm, ensure adequate external guiding to prevent excessive side loading on the 16 mm rod. The cylinder operates at speeds of 30-800 mm/s.
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 SAIJ40BX240-20 FAQ
It features a rear adjusting screw that acts as a mechanical stop, allowing you to shorten the effective stroke by up to 20 mm. This provides a usable travel window of 220-240 mm, which is set at commissioning without needing external stops.
At 0.5 MPa operating pressure, it provides 628 N of push force and 528 N of pull force. At 0.7 MPa, the push force increases to 879 N.
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