Airtac SAIJ50 Adjustable Cylinder SAIJ50BX425-20S
The AirTAC Airtac SAIJ50 Adjustable Cylinder SAIJ50BX425-20S 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 SAIJ50BX425-20S
The AirTAC SAIJ50X425-20-S is a double-acting, single-rod ISO 15552 profile cylinder featuring a rear stroke adjuster. It provides a usable travel window of 405 to 425 mm, allowing you to fine-tune the retract end position by up to 20 mm without adding external stops. In the 50 mm bore class, it delivers 982 N of push force and 825 N of pull force at 0.5 MPa.
Built with a SUS304 stainless steel rod and PT tapered ports, this variant includes a magnet for CMSE reed and DMSE electronic sensors. The extruded aluminum barrel integrates sensor grooves on both sides, and the mounting interface supports Basic, FA, LB, TC, FTC, TCM1, and TCM2 brackets.
Airtac SAIJ50 Adjustable Cylinder SAIJ50BX425-20S Technical Specifications
| Model | Airtac SAIJ50 Adjustable Cylinder SAIJ50BX425-20S |
|---|---|
| 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 SAIJ50BX425-20S
| 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 SAIJ50BX425-20S Is Used
Machine Setup & Changeover
Dial in the 405-425 mm travel window during commissioning to perfectly position end-stops for new product runs without changing the cylinder.
Variable End-Stop Positioning
Fine-tune the retract stroke by up to 20 mm to accommodate minor differences in part dimensions on the assembly line.
Material Handling
Provides 982 N of push force at 0.5 MPa for pushing or lifting loads, with a rear stopper that sets the travel end without holding the load.
Is the Airtac SAIJ50 Adjustable Cylinder SAIJ50BX425-20S the Right Cylinder?
Choose this 50 mm bore when you need more thrust than the 40 mm version (628 N at 0.5 MPa) but want a smaller footprint than the 63 mm option (1559 N). The 20 mm adjustable stroke is ideal for product changeovers, letting you dial in the exact end-stop during commissioning rather than swapping a fixed-stroke SAI cylinder. Because the 425 mm stroke is relatively long, an external guide is recommended to handle side loading. Remember that the rear adjuster is a travel stop, not a lock; for fail-safe load holding without live air, use an SAIL or BSAI cylinder. To match this ISO 15552 replacement, specify the 50 mm bore, 425 mm stroke, 20 mm adjustment, PT G1/4 ports, and the -S magnet.
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 SAIJ50BX425-20S FAQ
At 0.5 MPa operating pressure, the 50 mm bore provides 982 N of push force and 825 N of pull force. At the maximum 1.0 MPa pressure, it delivers up to 200 kgf.
The rear adjuster acts as a stopper that lets you shorten the 425 mm nominal stroke by up to 20 mm, creating a usable travel window of 405 to 425 mm. It sets the end position but does not lock the load without live air pressure.
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Covers non-human-caused product damage.
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Standard models are processed and dispatched in 3-5 business days.
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