Airtac SAIJ40 Adjustable Cylinder SAIJ40BX50-50
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX50-50 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 50mm 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
- Stroke50 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX50-50
The AirTAC SAIJ40X50-50 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, allowing you to dial back the nominal 50 mm travel by up to 50 mm. This creates a highly versatile 0-50 mm usable window, letting you fine-tune the retract end-position precisely during commissioning without swapping out the unit. It delivers a robust 628 N push force at 0.5 MPa, making it well-suited for compact mid-range automation tasks.
Beyond its adjustable stop, this variant features a SUS304 stainless steel piston rod (option B) for superior corrosion resistance in washdown or chemically active environments. The extruded aluminum barrel includes sensor grooves on both sides for straightforward switch mounting. It uses a PT tapered port thread (G1/4) and relies on variable air cushions at both ends to decelerate the load smoothly.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX50-50 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX50-50 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 50 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 SAIJ40BX50-50
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×50 | 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 SAIJ40BX50-50 Is Used
Machine Changeover
Dial in the exact retract distance on the fly when switching a packaging line between different product sizes, using the full 0-50 mm window to set new end positions without hardware swaps.
End-Stop Calibration
Fine-tune the final resting position of a clamping or pressing mechanism during commissioning, ensuring perfect alignment without adding bulky external mechanical stops.
Washdown Conveying
Actuate diverters or gates in food-grade or chemical washdown environments, leveraging the SUS304 stainless steel rod for corrosion resistance while adjusting stroke limits on site.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX50-50 the Right Cylinder?
Choose this 40 mm bore when your application requires around 628 N of push force at 0.5 MPa, but might need slightly less room than a 50 mm bore (which yields 982 N). The SAIJ40X50-50 is selected specifically when the exact retract distance is unknown at design time or changes between product runs, eliminating the need to bolt on external stops. The rear adjuster acts purely as a travel stop and does not hold the load without live air pressure; for true load-holding, consider an SAIL or BSAI series cylinder.
When matching this as an ISO 15552 replacement, verify the 40 mm bore, 50 mm nominal stroke, 50 mm adjustment range, PT G1/4 port, and standard mounting interface. Because the nominal stroke is under 300 mm, side-load stress on the 16 mm rod is manageable, though long unsupported loads should still use an external guide. The reduced SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting FB, CA, CB, and CR brackets.
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 SAIJ40BX50-50 FAQ
The 40 mm bore generates a push force of 628 N and a pull force of 528 N at 0.5 MPa. At the maximum operating pressure of 1.0 MPa, it can deliver up to 128 kgf.
A rear adjusting screw acts as an external stopper, allowing you to shorten the effective travel from its nominal 50 mm down to 0 mm. This provides a 0-50 mm adjustable window for fine-tuning the end position at commissioning, though it serves as a stop and not a lock.
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