Airtac SAIJ40 Adjustable Cylinder SAIJ40BX225-20S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX225-20S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 225mm 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
- Stroke225 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX225-20S
The AirTAC SAIJ40X225-20-S is a double-acting, single-rod ISO 15552 profile cylinder featuring a rear stroke adjuster. It provides a usable travel window of 205 to 225 mm, allowing you to dial back the nominal 225 mm stroke by up to 20 mm during machine commissioning. Equipped with a -S magnet, it supports CMSE reed and DMSE electronic sensors. The SUS304 stainless steel rod and PT tapered port handle demanding environments.
Delivering 628 N of push force and 528 N of pull force at 0.5 MPa, this 40 mm bore profile cylinder is designed for air filtration to 40 um. The extruded aluminum barrel includes sensor grooves on both sides. The rear stopper screw fine-tunes the end position without requiring external stops, though it acts only as a travel deceleration point and does not hold the load without live air.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX225-20S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX225-20S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 225 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 SAIJ40BX225-20S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×225 | 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 SAIJ40BX225-20S Is Used
Machine Changeover
Dial in the exact end-stop position for new product sizes on a packaging line without physically swapping cylinders or adding external stopper blocks.
Assembly Calibration
Fine-tune the 205-225 mm travel window during initial commissioning to perfectly seat components without applying damaging impact forces.
Variable End Stops
Adjust the retract stroke length on the fly for diverter mechanisms that must handle varying package dimensions on a single conveyor belt.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX225-20S the Right Cylinder?
Choose this adjustable-stroke SAIJ40X225-20-S when your setup requires precise end-position tuning at changeover, avoiding the need to physically swap out a fixed-stroke SAI cylinder. If your application needs less force, stepping down to a 32 mm bore yields 402 N of push force at 0.5 MPa. If you require more thrust, stepping up to a 50 mm bore provides 982 N.
Because the 225 mm stroke is significant, the 16 mm rod and M12x1.25 thread will still experience leverage on long unsupported loads; always use an external guide to prevent side-load damage. This cylinder utilizes a PT tapered port and the reduced SAIJ mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2), omitting FB, CA, CB, and CR brackets. Note that the rear adjuster and air cushions do not function as a lock; for load-holding without live pressure, specify an SAIL or BSAI cylinder.
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 SAIJ40BX225-20S FAQ
At an operating pressure of 0.5 MPa, this 40 mm bore cylinder provides 628 N of push force and 528 N of pull force. At the maximum 1.0 MPa, it delivers 1130 N of push force.
The rear adjuster screw allows you to shorten the effective travel from the 225 mm nominal stroke down to 205 mm, giving a 205-225 mm usable window. This stopper only sets the travel end and decelerates the piston; it does not lock or hold the load without continuous air pressure.
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