Airtac SAIJ40 Adjustable Cylinder SAIJ40BX50-40
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX50-40 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 SAIJ40BX50-40
The AirTAC SAIJ40X50-40 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, delivering 879N of push force at 0.7 MPa. It features a SUS304 stainless steel rod for superior corrosion resistance and PT tapered port threads. By integrating an external adjusting screw, this actuator allows you to fine-tune the retract end-position during commissioning without swapping out the entire cylinder.
With a 50mm nominal stroke and a 40mm adjustment code, this model provides a usable travel window of 10-50mm. The extruded aluminum barrel includes sensor grooves on both sides, ready to accept CMSE reed or DMSE electronic switches if a magnet is added later. The rear stopper simply sets the travel limit and relies on the variable air cushion for deceleration; it does not lock or hold the load without continuous live air pressure.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX50-40 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX50-40 |
|---|---|
| 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 SAIJ40BX50-40
| 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 SAIJ40BX50-40 Is Used
Machine Changeover
Dial in the exact 10-50mm end-position during product size changes without adding external stopper blocks to the fixture.
End-Position Tuning
Fine-tune the retract stroke at commissioning to perfect the seating pressure of delicate components using the rear screw.
Short-Stroke Clamping
Utilize the 879N push force at 0.7 MPa for clamping parts, adjusting the travel limit precisely to avoid deforming the workpiece.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX50-40 the Right Cylinder?
Select this 40mm bore actuator when an application demands precise end-stop tuning within a short 10-50mm travel window. If your setup requires less force, stepping down to a 32mm bore yields 563N at 0.7 MPa, whereas moving up to a 50mm bore provides 1374N. The adjustable stroke is specifically beneficial for machine changeovers, allowing operators to dial in the exact position on the fly instead of machining external hard stops.
Because the stroke is under 300mm, side-load stress on the 16mm rod is manageable, though external guides remain recommended for heavy lateral loads. To match this ISO 15552 dimensionally interchangeable cylinder, confirm the 50mm stroke, 40mm adjustment range, PT G1/4 port, and the reduced SAIJ mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2). Note that the rear adjuster acts only as a travel stop; for true load-holding without air pressure, consider an external rod lock or the AirTAC 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 SAIJ40BX50-40 FAQ
At 0.7 MPa operating pressure, this 40mm bore cylinder provides 879N of push force and 738N of pull force. It can achieve a maximum push force of 1130N at 0.9 MPa.
The rear adjuster screw allows you to mechanically shorten the effective stroke by up to 40mm. This creates a usable travel window of 10-50mm, letting you set the exact retract end-position without replacing the cylinder.
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