Airtac SAIJ40 Adjustable Cylinder SAIJ40BX50-30
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX50-30 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 SAIJ40BX50-30
The AirTAC SAIJ40X50-30 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a usable travel window of 20 to 50 mm, allowing you to dial back the nominal 50 mm stroke by up to 30 mm during commissioning. This bore size delivers 628N of push force at 0.5 MPa, making it well-suited for moderate actuation tasks.
The barrel is machined from extruded aluminum and includes sensor grooves on both sides for straightforward position feedback. This specific configuration uses a SUS304 stainless steel rod for superior corrosion resistance and features PT tapered port threads. The rear adjuster acts purely as a mechanical stop to set the end position, meaning it cannot hold a load dynamically without live air pressure.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX50-30 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX50-30 |
|---|---|
| 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 SAIJ40BX50-30
| 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 SAIJ40BX50-30 Is Used
Product Changeover
Dial in the 20-50 mm travel window on the fly to accommodate varying package sizes on a packaging line without changing hardware.
Commissioning Setup
Fine-tune the exact end-of-stroke position during machine setup to perfect alignment and avoid rigid external stopper bolts.
Variable End Stops
Adjust the retract distance precisely for delicate positioning tasks where a fixed 50 mm stroke would overpower the assembly.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX50-30 the Right Cylinder?
Choose this adjustable model over a fixed-stroke SAI when your application requires variable end-stops or frequent product-size changeovers that would otherwise demand physically swapping cylinders. If you need higher clamping power, stepping up to the 50mm bore yields 982N of push force at 0.5 MPa. Because this SKU lacks a magnet, you cannot mount AirTAC CMSE or DMSE sensors for end-of-stroke detection. To replace an existing ISO 15552 cylinder, match the 40mm bore, 50mm stroke, PT port thread, and the Basic, FA, LB, TC, FTC, TCM1, or TCM2 mounting interface. Note that the SAIJ series omits the FB, CA, CB, and CR mounts. If your process requires true load-holding without continuous air pressure, consider the SAIL locking cylinder or an external pilot-operated check valve.
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 SAIJ40BX50-30 FAQ
The rear adjuster screw functions as a mechanical stop, letting you shorten the effective stroke from its 50 mm nominal length down to as little as 20 mm. This provides a 30 mm tuning range to set the exact retract position without replacing the cylinder.
At a standard 0.5 MPa operating pressure, this 40 mm bore cylinder generates 628N of push force and 528N of pull force. It can reach up to 1130N of push force at its maximum 0.9 MPa pressure rating.
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