Airtac SAIJ40 Adjustable Cylinder SAIJ40BX550-100
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX550-100 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 550mm 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
- Stroke550 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX550-100
The AirTAC SAIJ40X550-100 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to fine-tune the effective travel within a 450-550 mm window. It delivers a robust 628N push force at 0.5 MPa, making it highly suitable for precise end-position calibration during machine commissioning or product changeover. The extruded aluminum barrel includes sensor grooves on both sides for flexible switch mounting.
This specific SKU is configured with a SUS304 stainless steel rod (code B) for superior corrosion resistance and utilizes PT tapered port threads. It operates at speeds of 30-800 mm/s and relies on variable air cushions at both ends to decelerate the load. The rear adjuster acts strictly as a mechanical stop to set the travel limit and does not lock or hold the load without live air pressure.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX550-100 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX550-100 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 550 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 SAIJ40BX550-100
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×550 | 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 SAIJ40BX550-100 Is Used
Machine Changeover
Dial in the 450-550mm travel window during product size transitions without physically swapping out the entire actuator.
End-Stop Calibration
Precisely tune the retract end-position at commissioning using the rear screw, eliminating the need for external mechanical stops.
Variable Position Diverter
Adjust the stroke length on the fly to accommodate different package sizes moving down a packaging or sorting line.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX550-100 the Right Cylinder?
Select this 40mm bore cylinder when your application requires a 550mm stroke but demands flexibility in the final end-stop position, avoiding the need to swap cylinders for slight length changes. If your setup requires higher thrust, stepping up to the 50mm bore yields 982N of push force at 0.5 MPa. Because this cylinder features a 550mm stroke, an external guide is recommended to prevent excessive side-load wear on the rod and seals.
For a drop-in ISO 15552 replacement, verify the 40mm bore, 550mm stroke, 100mm adjustment range, PT G1/4 port, and the reduced SAIJ mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2). Note that this non-magnetic variant cannot host sensors; if position detection is needed, select an -S model to utilize CMSE reed or DMSE electronic switches. For applications requiring true load-holding without continuous air pressure, consider the SAIL or BSAI series instead.
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 SAIJ40BX550-100 FAQ
At a 0.5 MPa operating pressure, this 40mm bore cylinder provides 628N of push force and 528N of pull force. At the maximum 1.0 MPa pressure, it can deliver up to 128 kgf.
The rear adjuster screw allows you to mechanically shorten the nominal 550mm stroke by up to 100mm, providing a usable travel window between 450mm and 550mm. This stopper only sets the end position and decelerates the load; it does not function as a lock or brake to hold the load without air pressure.
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