Airtac SAIJ40 Adjustable Cylinder SAIJ40BX145-30S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX145-30S 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 SAIJ40BX145-30S
The AirTAC SAIJ40X145-30-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to trim the nominal 145 mm travel back by up to 30 mm, creating a precise 115-145 mm usable window. This built-in stopper lets you fine-tune the retract end-position at commissioning without swapping the cylinder or adding external stops. Delivering 628 N of push force at 0.5 MPa, it uses a G1/4 port and M12x1.25 rod thread.
This specific SKU is configured with a SUS304 stainless steel rod for superior corrosion resistance and includes a magnet for position sensing. It works seamlessly with AirTAC CMSE reed and DMSE electronic solid-state switches fitted into the sensor grooves on both sides of the extruded aluminum barrel. The rear adjuster acts purely as a travel stop and does not hold the load without live air pressure.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX145-30S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX145-30S |
|---|---|
| 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 SAIJ40BX145-30S
| 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 SAIJ40BX145-30S Is Used
End-Position Tuning
Dial in the exact retract distance within the 115-145 mm window during commissioning to perfect a pressing or clamping operation without machining new hard stops.
Product Changeover
Quickly adjust the travel end-stop on a packaging line when switching to a different product size, using the rear screw rather than replacing the entire actuator.
Corrosive Environments
Leverage the SUS304 stainless steel rod in washdown or chemical exposure areas where standard carbon steel rods would degrade over time.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX145-30S the Right Cylinder?
Choose this 40 mm bore when you need more force than the 32 mm version (402 N at 0.5 MPa) but want to avoid the bulk of a 50 mm cylinder (982 N at 0.5 MPa). The adjustable stroke is highly beneficial for machine setups requiring variable end-stops or frequent product-size changeovers, saving time over a fixed-stroke SAI cylinder. To match this ISO 15552 interchangeable cylinder, specify a 40 mm bore, 145 mm stroke, 30 mm adjustment, PT tapered port thread, and the -S magnet option.
Because the stroke is 145 mm, it is below the 300 mm threshold where external side-load guides become strictly necessary, but the M12x1.25 rod still handles lateral loads better than smaller bores. Remember that the rear adjuster is a stop, not a lock; if your application requires load-holding without live air pressure, consider the SAIL (air-released lock) or BSAI (clamp-lock) cylinders instead.
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 SAIJ40BX145-30S FAQ
At a standard 0.5 MPa operating pressure, this 40 mm bore cylinder provides 628 N of push force and 528 N of pull force. At the maximum 1.0 MPa pressure, it can deliver up to 128 kgf.
The rear adjuster screw acts as an external stopper that lets you shorten the 145 mm nominal stroke by up to 30 mm, providing a usable travel window of 115-145 mm. It only sets the travel end and does not lock or hold the load without continuous air pressure.
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