Airtac SAIJ40 Adjustable Cylinder SAIJ40BX210-30
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX210-30 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 210mm 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
- Stroke210 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX210-30
The AirTAC SAIJ40X210-30 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster. It provides a nominal 210 mm stroke that can be dialed back by up to 30 mm, creating a precise 180-210 mm usable travel window for fine-tuning end positions during commissioning. Equipped with a SUS304 stainless steel rod, it handles thrust up to 628 N at 0.5 MPa and uses PT tapered G1/4 ports.
This adjustable model eliminates the need to swap cylinders or add external stops when product sizes change. The rear adjuster acts purely as a travel stop and works alongside the 30 mm air cushions at both ends to decelerate the load, but it does not hold the load without live air pressure. For position holding, a SAIL or BSAI series cylinder is required.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX210-30 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX210-30 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 210 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 SAIJ40BX210-30
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×210 | 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 SAIJ40BX210-30 Is Used
Product Changeover Tuning
Dial back the stroke by up to 30 mm to accommodate new package lengths on a packaging line without physically replacing the cylinder.
End-Stop Calibration
Fine-tune the exact retract position during machine commissioning to ensure perfect alignment of tooling and prevent mechanical crashes.
Variable Diverter Stroke
Adjust the travel window between 180 and 210 mm to precisely control the push distance of parts onto different conveyor lanes.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX210-30 the Right Cylinder?
Choose this 40 mm bore when an application requires 628 N of push force at 0.5 MPa, stepping up from the 32 mm bore (402 N) for heavier loads, or down from the 50 mm bore (982 N) to save space. An adjustable stroke is selected over a fixed SAI cylinder when a machine requires variable end-stops or fine end-position tuning during setup. To match this ISO 15552 footprint, specify the 40 mm bore, 210 mm stroke, 30 mm adjustment, PT G1/4 port, and your preferred mounting bracket from the reduced SAIJ set (Basic, FA, LB, TC, FTC, TCM1, TCM2). Because the stroke is 210 mm, ensure external guides are used to prevent side-load damage to the M12x1.25 rod thread.
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 SAIJ40BX210-30 FAQ
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 reach up to 1130 N of push force at 0.9 MPa.
The rear adjuster acts as an external stopper that mechanically limits the retract travel. It allows you to shorten the effective stroke from 210 mm down to 180 mm, but it does not lock the position without continuous air pressure.
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