Airtac SAIJ40 Adjustable Cylinder SAIJ40BX145-20S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX145-20S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 145mm 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
- Stroke145 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX145-20S
The AirTAC SAIJ40X145-20-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, enabling you to fine-tune the retract end-position during commissioning. It provides a usable travel window of 125-145 mm, letting you trim up to 20 mm off the 145 mm nominal stroke without adding external stops. Delivering 628 N of push force at 0.5 MPa, it suits moderate load handling.
This SKU features a SUS304 stainless steel rod for superior corrosion resistance and includes a built-in magnet for CMSE and DMSE sensors. The extruded aluminum barrel includes sensor grooves on both sides, and it uses a PT G1/4 port. The rear adjuster functions strictly as a travel stop to set deceleration, not as a lock, so live air is required to hold the load.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX145-20S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX145-20S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 145 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 SAIJ40BX145-20S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×145 | 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 SAIJ40BX145-20S Is Used
Machine Changeover
Dial in the 125-145 mm travel window during product size transitions on a packaging line without physically replacing the actuator.
End-Stop Tuning
Fine-tune the retract position at commissioning to perfect a pressing or locating operation, using the rear screw as a precise stop.
Variable Diverter
Adjust the stroke on a sorting diverter arm to handle different package lengths on the fly, relying on the SUS304 rod for durability.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX145-20S the Right Cylinder?
Choose this adjustable-stroke model when your machine setup requires variable end-stops or product-size changeovers, avoiding the need to swap a fixed-stroke SAI cylinder. If your application needs higher force, stepping up to the 50 mm bore yields 982 N push at 0.5 MPa; stepping down to the 32 mm bore provides 402 N.
For a true ISO 15552 replacement match, ensure you specify the 40 mm bore, 145 mm stroke, 20 mm adjustment, PT G1/4 port, and the -S magnet. Remember that the rear adjuster and air cushions only manage travel ends; for load-holding without live air pressure, consider an external rod lock, pilot-operated check valve, or the AirTAC SAIL and BSAI series.
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 SAIJ40BX145-20S FAQ
The rear adjuster acts as an external stopper that lets you shorten the effective stroke by up to 20 mm. This gives the 145 mm nominal stroke a usable travel window of 125-145 mm, allowing precise end-position tuning at commissioning without swapping cylinders.
At 0.5 MPa operating pressure, this 40 mm bore cylinder provides 628 N of push force and 528 N of pull force. It can deliver up to 1130 N of push force at 0.9 MPa.
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