Airtac SAIJ40 Adjustable Cylinder SAIJ40BX120-40S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX120-40S 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 SAIJ40BX120-40S
The AirTAC SAIJ40X120-40-S is a double-acting, single-rod ISO 15552 profile cylinder featuring a rear stroke adjuster. It provides a nominal 120 mm stroke that can be dialed back by up to 40 mm, giving you a usable travel window of 80 to 120 mm to perfectly tune end positions at commissioning. Equipped with a SUS304 stainless steel rod and PT tapered ports, it delivers 628 N of push force and 528 N of pull force at 0.5 MPa.
This adjustable-stroke model uses an external rear stopper screw rather than requiring a cylinder swap or external stops to change your effective travel. The adjuster acts purely as a travel stop and relies on the integrated air cushions for end-deceleration, meaning it cannot hold a load without live air pressure. For load-holding requirements without continuous pressure, consider the SAIL or BSAI series instead.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX120-40S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX120-40S |
|---|---|
| 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 SAIJ40BX120-40S
| 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 SAIJ40BX120-40S Is Used
Commissioning End-Tuning
Dial in the exact 80 to 120 mm travel window during machine setup without swapping cylinders or adding bulky external stopper blocks.
Product Changeover Lines
Quickly adjust the retract end-position to accommodate varying package sizes or product lengths on a shared transport conveyor.
Stainless Rod Assembly
Leverage the SUS304 stainless steel rod for light manufacturing tasks requiring corrosion resistance and precise stroke trimming.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX120-40S the Right Cylinder?
Select this 40 mm bore cylinder when your application requires 628 N push force at 0.5 MPa, stepping up from the 32 mm bore (402 N push) for heavier workpieces or down from the 50 mm bore (982 N push) for lighter, faster assembly tasks. The adjustable 80 to 120 mm travel window is ideal for product changeovers on a line where exact end-of-stroke positioning varies slightly between fixtures. To match this ISO 15552 replacement, verify your 120 mm stroke, up to 40 mm adjustment, PT port threads, SUS304 rod, and the -S magnet for sensor compatibility.
Because the stroke is 120 mm, side loads are minimal, but long unsupported strokes still need an external guide to prevent rod binding. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting the FB, CA, CB, and CR options. The -S magnet works seamlessly with AirTAC CMSE reed and DMSE electronic solid-state sensors mounted in the dual-sided sensor grooves.
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 SAIJ40BX120-40S FAQ
At 0.5 MPa operating pressure, this 40 mm bore cylinder provides 628 N of push force and 528 N of pull force. At 0.7 MPa, the push force increases to 879 N.
The rear adjuster screw acts as a mechanical stop that shortens the effective travel. For this 120 mm stroke model, you can trim the stroke back by up to 40 mm, creating a usable travel window of 80 to 120 mm. It functions as a stop, not a lock, and requires live air to hold position.
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