Airtac SAIJ50 Adjustable Cylinder SAIJ50BX425-30
The AirTAC Airtac SAIJ50 Adjustable Cylinder SAIJ50BX425-30 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 SAIJ50BX425-30
The AirTAC SAIJ50X425-30 is a double-acting ISO 15552 profile cylinder featuring a rear mechanical adjuster that allows you to fine-tune the stroke length. With a nominal travel of 425 mm and a 30 mm adjustment range, you get a usable end-position window of 395-425 mm. This bore size delivers 982 N of push force and 825 N of pull force at 0.5 MPa, making it well-suited for medium-duty handling tasks.
This specific configuration uses a SUS304 stainless steel piston rod (option B) for superior corrosion resistance and features PT tapered port threads. The extruded aluminum barrel includes sensor grooves on both sides for flexible mounting of CMSE reed or DMSE electronic solid-state switches. The rear adjuster functions purely as a travel stop for deceleration and positioning; it does not hold the load pneumatically without live air pressure.
Airtac SAIJ50 Adjustable Cylinder SAIJ50BX425-30 Technical Specifications
| Model | Airtac SAIJ50 Adjustable Cylinder SAIJ50BX425-30 |
|---|---|
| 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 SAIJ50BX425-30
| 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 SAIJ50BX425-30 Is Used
Product Changeover Tuning
Dial in the end-stop up to 30 mm during format changes on a packaging line, avoiding the need to swap physical spacers or cylinders for different carton sizes.
Variable End-Stop Positioning
Set precise retract distances for diverters or gates on a conveyor, using the 395-425 mm travel window to adapt to varying product lengths on the fly.
Assembly Press Stroke Setup
Fine-tune the final approach position of a medium-duty assembly tool at commissioning, using the rear screw to compensate for mechanical tolerances without external stops.
Is the Airtac SAIJ50 Adjustable Cylinder SAIJ50BX425-30 the Right Cylinder?
Choose this adjustable-stroke model over a fixed SAI cylinder when your machine setup requires variable end-stops or precise product-changeover tuning without physically swapping out the actuator. If you need higher force, stepping up to a 63 mm bore yields 1559 N at 0.5 MPa; if your load is lighter, a 40 mm bore provides 628 N.
Because the 425 mm stroke is substantial, the 20 mm rod diameter and M16x1.5 rod thread will still experience some deflection under heavy side loads, so an external guide rail is recommended for rigid transport. To replace an ISO 15552 cylinder, match the 50 mm bore, 425 mm stroke, 30 mm adjuster, PT G1/4 ports, and your required mounting interface (Basic, FA, LB, TC, FTC, TCM1, or TCM2). Note that SAIJ omits the FB, CA, CB, and CR mountings. For fail-safe load holding without live air, select an SAIL or BSAI cylinder instead, as this adjuster is not a lock.
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 SAIJ50BX425-30 FAQ
At 0.5 MPa operating pressure, this 50 mm bore cylinder provides 982 N of push force and 825 N of pull force. It can deliver up to 1767 N of push force at 0.9 MPa.
The rear adjuster acts as an external stopper that shortens the effective stroke by up to 30 mm, giving you a usable travel window of 395-425 mm. It sets the end position but does not lock or hold the load without live air pressure.
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