Airtac SAIJ40 Adjustable Cylinder SAIJ40BX120-30
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX120-30 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 SAIJ40BX120-30
The AirTAC SAIJ40X120-30 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a usable travel window of 90 to 120 mm, allowing you to dial back the nominal 120 mm stroke by up to 30 mm during machine commissioning without adding external stops. With a 16 mm carbon steel rod and M12x1.25 threading, it delivers 628 N of push force and 528 N of pull force at 0.5 MPa.
This unit features a SUS304 stainless steel rod (option B) for superior corrosion resistance in harsh environments. The extruded aluminum barrel includes sensor grooves on both sides for flexible mounting of CMSE or DMSE switches, though this specific SKU is configured without a magnet. Fluid supply is routed through PT G1/4 tapered ports, and the mounting interface supports Basic, FA, LB, TC, FTC, TCM1, and TCM2 brackets.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX120-30 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX120-30 |
|---|---|
| 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 SAIJ40BX120-30
| 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 SAIJ40BX120-30 Is Used
Machine Changeover
Dial in the exact 90 to 120 mm end position when switching product sizes on a packaging line, avoiding mechanical rebuilds.
End-Position Tuning
Fine-tune the retract stop during commissioning to absorb mechanical tolerances without swapping out the entire ISO 15552 cylinder.
Actuator Setup
Use the 30 mm adjustment range to set precise spacing in assembly stations, relying on the 628 N thrust to push components into place.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX120-30 the Right Cylinder?
Choose this 40 mm bore when your application requires less force than the 50 mm bore (982 N push at 0.5 MPa) but more than the 32 mm option (402 N). The adjustable stroke is ideal for product changeovers where the exact end-of-stroke position needs fine-tuning on the fly, unlike a fixed-stroke SAI cylinder. Remember that the rear adjuster acts as a travel stop to decelerate the load, not a lock; the cylinder will not hold its position without live air pressure. For load-holding requirements, consider the SAIL or BSAI series instead. This model uses PT G1/4 ports and a SUS304 rod.
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 SAIJ40BX120-30 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 the maximum 1.0 MPa pressure, it delivers 1130 N of push force.
The rear adjuster allows you to shorten the 120 mm nominal stroke by up to 30 mm, creating a 90 to 120 mm usable travel window. This stopper sets the end position but does not lock the load without continuous air pressure.
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