Airtac SAIJ40 Adjustable Cylinder SAIJ40BX500-20
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX500-20 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 500mm 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
- Stroke500 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX500-20
The AirTAC SAIJ40X500-20 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that trims the effective travel. With a 500mm nominal stroke and a 20mm adjustment range, it provides a 480-500mm usable travel window for fine-tuning end positions. It delivers 628N of push force and 528N of pull force at 0.5MPa, making it suitable for mid-range actuation tasks.
This model uses a SUS304 stainless steel rod for superior corrosion resistance and features a PT tapered port thread. The extruded aluminum barrel includes sensor grooves on both sides for flexible switch mounting. The rear adjuster acts purely as a mechanical stop to set deceleration and end-position, meaning it cannot hold a load without live air pressure.
For load-holding without continuous pressure, an external rod lock or related types like SAIL or BSAI are required. The mounting options include Basic, FA, LB, TC, FTC, TCM1, and TCM2.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX500-20 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX500-20 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 500 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 SAIJ40BX500-20
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×500 | 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 SAIJ40BX500-20 Is Used
Machine Changeover
Dial in the 480-500mm travel window during product size changes on a packaging line without adding external stopper blocks.
End-Position Tuning
Fine-tune the retract end-position at commissioning to absorb mechanical tolerances and ensure precise tool placement.
Variable End Stops
Adjust the stroke on the fly for conveyor diverters or gating mechanisms that require slight positional shifts.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX500-20 the Right Cylinder?
Choose this SAIJ40X500-20 model when your application requires precise end-position tuning during commissioning or product changeover without swapping cylinders. If you need higher force, stepping up to a 50mm bore yields 982N of push force at 0.5MPa, while dropping to a 32mm bore reduces it to 402N. Because the 500mm stroke is relatively long, the 16mm rod diameter and M12x1.25 rod thread may still require an external guide to prevent side-load damage on unsupported loads. To replace an ISO 15552 cylinder, match the 40mm bore, 500mm stroke, 20mm adjustment, PT port, and the appropriate mounting accessory. Note that the rear adjuster is a travel stop, not a lock; for position holding without live air, consider an external pilot-operated check valve or the SAIL series.
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 SAIJ40BX500-20 FAQ
It provides 628N push and 528N pull force at 0.5MPa, and 879N push force at 0.7MPa. The 500mm nominal stroke can be adjusted rearward by up to 20mm, creating a 480-500mm usable travel window.
The rear adjusting screw acts as a mechanical stop that fine-tunes the retract end position. It is not a locking device, so the cylinder cannot hold a load without live air pressure; for load-holding, use SAIL or BSAI cylinders.
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