Airtac SAIJ50 Adjustable Cylinder SAIJ50BX425-50
The AirTAC Airtac SAIJ50 Adjustable Cylinder SAIJ50BX425-50 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø50mm bore and 425mm 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.
- BoreØ50 mm
- Stroke425 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- CushionAdjustable, 30 mm
- No minimum order. A single piece can be ordered.
- Ready in 3–5 business days. That is the time we take to process the order and hand it to the carrier. Transit time after that depends on the destination.
About the Airtac SAIJ50 Adjustable Cylinder SAIJ50BX425-50
The AirTAC SAIJ50X425-50 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a 425 mm nominal stroke that can be dialed back by up to 50 mm, yielding a precise 375-425 mm usable travel window for exact end-position tuning during commissioning. At 0.5 MPa, it delivers 982 N of push force and 825 N of pull force.
This unit is built with a SUS304 stainless steel rod for superior corrosion resistance and includes sensor grooves on both sides of the extruded aluminum barrel. It uses PT tapered G1/4 ports and operates at speeds between 30 and 800 mm/s. The rear adjuster acts purely as a mechanical stop to set the retract end, meaning it cannot hold a load without live air pressure.
Airtac SAIJ50 Adjustable Cylinder SAIJ50BX425-50 Technical Specifications
| Model | Airtac SAIJ50 Adjustable Cylinder SAIJ50BX425-50 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø50 mm |
| Stroke | 425 mm |
| Acting type | Double acting |
| Port size | G1/4 |
| Rod thread | M16×1.5 |
| 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 (Ø50mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 982 N | 825 N |
| 0.7 MPa | 1374 N | — |
| Max (@1.0 MPa) | 200 kgf | |
Actual usable force is lower than theoretical due to friction and back-pressure. Size with a safety margin.
Model Code: Airtac SAIJ50 Adjustable Cylinder SAIJ50BX425-50
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 50 | Bore size in mm. |
| ×425 | 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 SAIJ50 Adjustable Cylinder SAIJ50BX425-50 Is Used
Product Changeover
Dial the stroke back by up to 50 mm to quickly adapt machinery for different package lengths without replacing the cylinder.
Variable End-Stop Diverter
Fine-tune the retract position within the 375-425 mm window to precisely align pushers with changing conveyor lane widths.
Commissioning Calibration
Use the rear stopper to micro-adjust the end of travel during machine setup, avoiding the need for external shims.
Is the Airtac SAIJ50 Adjustable Cylinder SAIJ50BX425-50 the Right Cylinder?
Choose this 50 mm bore when a 40 mm bore (628 N push at 0.5 MPa) lacks sufficient thrust, but a 63 mm bore (1559 N push) is oversized. An adjustable stroke is selected over a fixed SAI when a machine requires variable end-stops to accommodate product changeovers without physically swapping the cylinder. For load-holding without continuous air pressure, this cylinder is inadequate since the adjuster is a stop not a lock; you should explore an AirTAC SAIL or BSAI series instead.
Because the 425 mm stroke exceeds 300 mm, an external guide is recommended to prevent excessive side-loading on the SUS304 piston rod. To achieve a direct ISO 15552 replacement match, ensure your specifications align with a 50 mm bore, 425 mm stroke, 50 mm adjustment range, PT G1/4 ports, and the Basic, FA, LB, TC, FTC, TCM1, or TCM2 mounting set (omitting FB, CA, CB, and CR).
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 SAIJ50 Adjustable Cylinder SAIJ50BX425-50 FAQ
At 0.5 MPa operating pressure, this 50 mm bore cylinder provides 982 N of push force and 825 N of pull force. At 0.7 MPa, the push force increases to 1374 N.
The rear mechanical stopper allows you to shorten the 425 mm nominal stroke by up to 50 mm, creating a usable travel window of 375-425 mm. This adjuster only sets the end position and does not lock or hold the load without live air pressure.
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