Airtac SAIJ40 Adjustable Cylinder SAIJ40BX210-20
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX210-20 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 SAIJ40BX210-20
The AirTAC SAIJ40X210-20 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that creates a 190-210mm usable travel window. Delivering 628N of push force at 0.5 MPa, it is built with a SUS304 stainless steel rod for superior corrosion resistance and uses a PT tapered port thread.
The rear stopper mechanism allows precise end-position tuning during commissioning without adding external stops. This adjustable travel stop is not a locking device; the cylinder requires live air to maintain its position, and load-holding applications require a SAIL or BSAI variant.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX210-20 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX210-20 |
|---|---|
| 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 SAIJ40BX210-20
| 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 SAIJ40BX210-20 Is Used
Machine Changeover
Dial in the 190-210mm travel window during product size changes without physically swapping cylinders or repositioning hard stops.
End-Position Tuning
Fine-tune the retract end position at commissioning to absorb mechanical tolerances and achieve exact placement.
Corrosive Assembly Lines
Leverage the SUS304 stainless steel rod for reliable actuation in environments requiring washdown or corrosion resistance.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX210-20 the Right Cylinder?
Choose this 40mm bore when an application requires 628N push force at 0.5 MPa, stepping up from a 32mm bore (402N) or down from a 63mm bore (1559N). The 20mm adjustment window is ideal for product changeovers, letting you fine-tune the 210mm stroke without swapping the cylinder. For fixed-position tasks, a standard SAI cylinder suffices.
To replace an ISO 15552 cylinder, match the 40mm bore, 210mm stroke, PT port thread, and SUS304 rod material. Note that SAIJ supports Basic, FA, LB, TC, FTC, TCM1, and TCM2 mounts, omitting FB, CA, CB, and CR options. Because the stroke exceeds 300mm is false here, standard side-load guidance applies, though external guides are recommended for unsupported loads.
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 SAIJ40BX210-20 FAQ
At 0.5 MPa, this 40mm bore cylinder provides 628N of push force and 528N of pull force. At 0.7 MPa, the push force increases to 879N.
The rear adjuster acts as a mechanical stop, allowing you to shorten the effective travel from the 210mm nominal stroke down to 190mm. It sets the end position but does not lock the load without live air pressure.
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