Airtac SAIJ40 Adjustable Cylinder SAIJ40BX120-10S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX120-10S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 120mm 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
- Stroke120 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX120-10S
The AirTAC SAIJ40X120-10-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, allowing you to fine-tune the end-of-travel position without adding external stops. With a nominal 120 mm stroke and a 10 mm adjustment screw, it provides a usable travel window of 110-120 mm to perfectly dial in machine stops during commissioning. This bore size delivers 628 N of push force and 528 N of pull force at 0.5 MPa.
Built for demanding environments, this specific configuration features a SUS304 stainless steel rod for superior corrosion resistance and includes a magnet for position sensing. The extruded aluminum barrel includes sensor grooves on both sides, seamlessly accepting AirTAC CMSE reed and DMSE electronic solid-state switches. It uses PT tapered ports sized G1/4 and achieves speeds from 30-800 mm/s.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX120-10S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX120-10S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 120 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 SAIJ40BX120-10S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×120 | 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 SAIJ40BX120-10S Is Used
End-Stop Calibration
Dial in the exact 110-120 mm travel distance during machine commissioning to perfect positioning without swapping cylinders.
Product Changeover
Quickly adjust the retract end-stop on a packaging line when running a slightly shorter product variant.
Corrosive Positioning
Leverage the SUS304 stainless steel rod for precise actuation in food processing or chemical environments requiring washdowns.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX120-10S the Right Cylinder?
Choose this 40 mm bore when you need precise end-position tuning on the fly, stepping up from a 32 mm bore (which provides 402 N push at 0.5 MPa) to gain extra thrust without a massive footprint increase. The adjustable rear stopper is ideal for product changeovers on a line, whereas a fixed-stroke SAI cylinder would require physical shimming or swapping. To replace an ISO 15552 cylinder, match the 40 mm bore, 120 mm stroke, 10 mm adjuster, PT G1/4 ports, and the -S magnet. Since the stroke is under 300 mm, side-load risks are minimal, but always guide the load for optimal bearing life.
Remember that the rear adjuster acts purely as a mechanical stop and does not hold the load without live air pressure. If your application requires true fail-safe load holding, consider the AirTAC SAIL pneumatic lock or BSAI clamp-lock cylinder instead of relying on the standard SAIJ adjuster.
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 SAIJ40BX120-10S FAQ
It features a rear stopper screw that allows you to shorten the effective stroke by up to 10 mm. This creates a 110-120 mm adjustable travel window, letting you fine-tune the retract end position at commissioning without external shims.
At a standard 0.5 MPa operating pressure, the SAIJ40X120-10-S provides 628 N of push force and 528 N of pull force. It can reach up to 1130 N of push force at 0.9 MPa.
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