Airtac SAIJ40 Adjustable Cylinder SAIJ40BX145-20
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX145-20 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 SAIJ40BX145-20
The AirTAC SAIJ40X145-20 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to trim the effective travel back by up to 20 mm. This creates a highly versatile 125-145 mm usable stroke window, letting you dial in the exact end position during commissioning without swapping out the cylinder or adding external stops. Delivering 628 N of push force and 528 N of pull force at 0.5 MPa, it fits perfectly into mid-range pneumatic setups.
This variant uses a SUS304 stainless steel rod (code B) for superior corrosion resistance, paired with PT tapered port threads. The extruded aluminum barrel includes sensor grooves on both sides for flexible switch mounting. Remember that the rear adjuster acts only as a travel stop to set deceleration points; it does not hold the load without live air pressure, so you would look to the SAIL or BSAI series if true lock-holding is required.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX145-20 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX145-20 |
|---|---|
| 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 SAIJ40BX145-20
| 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 SAIJ40BX145-20 Is Used
Machine Setup Calibration
Fine-tune the 125-145 mm travel window during initial machine commissioning to achieve precise end-positioning without machining external stopper blocks.
Product Size Changeover
Quickly adapt the cylinder stroke on packaging lines when handling slightly different product lengths, using the rear screw to shift the end stop.
Adjustable End Stop
Use the 20 mm trim range to set exact retraction points for delicate operations, relying on the stop rather than swapping the entire actuator.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX145-20 the Right Cylinder?
Choose this 40 mm bore when your application requires around 628 N of push force at 0.5 MPa, stepping up from a 32 mm bore (402 N push) for heavier clamping or lifting. The 20 mm adjustment range is ideal for product changeovers on a line where you need to vary the end-stop slightly rather than committing to a fixed 145 mm stroke standard SAI cylinder.
As an ISO 15552 dimensionally interchangeable cylinder, it matches standard mounting footprints using the Basic, FA, LB, TC, FTC, TCM1, and TCM2 accessories (omitting FB, CA, CB, and CR). Because the 145 mm stroke is below the 300 mm threshold, side-load stress on the 16 mm rod and M12x1.25 thread is manageable, but an external guide is still recommended for heavy lateral loads.
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 SAIJ40BX145-20 FAQ
At 0.5 MPa, this 40 mm bore cylinder provides 628 N of push force and 528 N of pull force. It operates at speeds between 30 and 800 mm/s, driven by a G1/4 port.
The rear adjuster screw lets you shorten the 145 mm nominal stroke by up to 20 mm, giving a usable travel window of 125-145 mm. It functions as a mechanical stop to set the travel end, not as a load-holding lock.
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