Airtac SAIJ40 Adjustable Cylinder SAIJ40BX400-30
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX400-30 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 400mm 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
- Stroke400 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX400-30
The AirTAC SAIJ40X400-30 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a 370-400 mm usable travel window by allowing you to dial back the 400 mm nominal stroke by up to 30 mm. In the 40 mm bore class, it delivers 628 N of push force and 528 N of pull force at a 0.5 MPa operating pressure. The piston rod is built from SUS304 stainless steel (code B) for superior corrosion resistance, and the PT tapered port thread ensures a tight, reliable pneumatic connection.
This adjustable-stroke design enables fine end-position tuning at commissioning or during product changeover without swapping the cylinder or adding external stops. The rear adjuster acts purely as a travel stop to set the retraction end position; it does not lock or hold the load without live air. For load-holding requirements without continuous pressure, consider the SAIL or BSAI variants. The extruded aluminum barrel includes sensor grooves on both sides, ready for AirTAC CMSE reed and DMSE electronic sensors if a magnet is added later.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX400-30 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX400-30 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 400 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 SAIJ40BX400-30
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×400 | 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 SAIJ40BX400-30 Is Used
Machine Changeover
Dial in the 370-400 mm travel window during product size changeovers to set new retraction end-stops without physically replacing the cylinder or adding external mechanical stops.
Material Handling
Drives a 400 mm stroke transfer arm on a conveyor line, using the rear adjuster to fine-tune the exact resting position of packages at the commissioning stage.
Assembly Station Setup
Provides 628 N of push force for a 40 mm bore assembly press, allowing operators to trim the stroke by up to 30 mm to achieve precise end-of-stroke positioning.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX400-30 the Right Cylinder?
Select this 40 mm bore model when your application requires 628 N of push force at 0.5 MPa, stepping up from the 32 mm bore (402 N push) for heavier handling, or stepping down from the 63 mm bore (1559 N push) to save space and air consumption. The adjustable 370-400 mm travel window is ideal for machine setups requiring variable end-stops or fine-tuning during commissioning. Since this is a 400 mm stroke, the 16 mm diameter rod and M12x1.25 thread handle moderate side loads, but an external guide rail is recommended for long unsupported strokes to prevent rod binding.
As a true ISO 15552 profile cylinder, it is dimensionally interchangeable with other ISO 15552 cylinders. It uses a reduced mounting set including Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting the FB, CA, CB, and CR mounts. The cylinder operates at speeds of 30-800 mm/s and features variable air cushions at both ends to decelerate the moving load.
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 SAIJ40BX400-30 FAQ
The rear adjuster screw acts as a mechanical stop that lets you shorten the effective stroke by up to 30 mm, providing a usable travel window of 370-400 mm. It sets the end position but does not lock the load without live air pressure.
At a 0.5 MPa operating pressure, this 40 mm bore cylinder provides 628 N of push force and 528 N of pull force. It can deliver up to 1130 N of push force at 0.9 MPa.
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