Airtac SAIJ40 Adjustable Cylinder SAIJ40BX30-20
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX30-20 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 30mm 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
- Stroke30 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX30-20
The AirTAC SAIJ40X30-20 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster. It provides a usable travel window of 10 to 30 mm, letting you dial back the nominal 30 mm stroke by up to 20 mm during commissioning. In the 40 mm bore class, it delivers 628 N of push thrust and 528 N of pull thrust at 0.5 MPa operating pressure.
This variant uses a SUS304 stainless steel rod for superior corrosion resistance and features PT tapered port threads. The extruded aluminum barrel includes sensor grooves on both sides, though this specific SKU omits the internal magnet, meaning pneumatic end-position sensing must be handled externally if required.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX30-20 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX30-20 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 30 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 SAIJ40BX30-20
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×30 | 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 SAIJ40BX30-20 Is Used
Machine Changeovers
Fine-tune the 10-30 mm travel window during product size transitions on a packaging line without physically replacing the actuator.
End-Position Trimming
Dial back the 30 mm nominal stroke by up to 20 mm to perfect the final clamping or pressing position at machine commissioning.
Variable Stops
Use the built-in rear stopper screw to establish precise, repeatable end-of-travel limits for delicate assembly operations.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX30-20 the Right Cylinder?
Choose this 40 mm bore when an application requires around 628 N of push force at 0.5 MPa, stepping up from a 32 mm bore that provides 402 N. The adjustable stroke is ideal for machine changeovers where you need a variable end-stop without physically swapping cylinders. Because the rear adjuster acts only as a travel stop and the air cushions manage deceleration, neither holds the load without live air pressure. For load-holding requirements, consider the SAIL or BSAI series instead. Match replacement dimensions by confirming the 40 mm bore, 30 mm stroke, 20 mm adjustment, PT G1/4 port, and your required mounting from the SAIJ set: Basic, FA, LB, TC, FTC, TCM1, or TCM2.
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 SAIJ40BX30-20 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 up to 1130 N of push force.
The rear adjuster screw lets you shorten the 30 mm nominal stroke by up to 20 mm, creating a usable travel window of 10 to 30 mm. This stopper sets the travel end but does not lock or hold the load without live air pressure.
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