Airtac SAIJ50 Adjustable Cylinder SAIJ50AX280-20S
The AirTAC Airtac SAIJ50 Adjustable Cylinder SAIJ50AX280-20S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø50mm bore and 280mm 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
- Stroke280 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- CushionAdjustable, 30 mm
About the Airtac SAIJ50 Adjustable Cylinder SAIJ50AX280-20S
The AirTAC SAIJ50X280-20-S is a double-acting ISO 15552 profile cylinder with a rear stroke adjuster, letting you dial back the 280 mm nominal travel by up to 20 mm. This creates a precise 260-280 mm usable window for fine-tuning end positions during commissioning without adding external stops. It delivers 982 N of push force and 825 N of pull force at 0.5 MPa, matching standard SAI power classes.
This SKU features a SUS420J2 stainless steel rod (option A) for corrosion resistance and includes a magnet for position sensing. You can mount CMSE reed or DMSE electronic sensors directly into the extruded aluminum barrel grooves. The PT tapered porting is G1/4, and the rear adjuster acts purely as a travel stop to set deceleration, not as a lock to hold the load without live air.
Airtac SAIJ50 Adjustable Cylinder SAIJ50AX280-20S Technical Specifications
| Model | Airtac SAIJ50 Adjustable Cylinder SAIJ50AX280-20S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø50 mm |
| Stroke | 280 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 SAIJ50AX280-20S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 50 | Bore size in mm. |
| ×280 | 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 SAIJ50AX280-20S Is Used
Commissioning End-Position Tuning
Dial in the exact 260 to 280 mm travel window during machine setup without physically swapping cylinders or machining external stopper blocks.
Product Size Changeover
Quickly adjust the retract stop on packaging lines when product dimensions change, using the rear screw to fine-tune the stroke limit.
Sensor-Ready Positioning
Leverage the built-in magnet and dual sensor grooves to mount CMSE or DMSE switches for precise end-of-stroke detection in automated workflows.
Is the Airtac SAIJ50 Adjustable Cylinder SAIJ50AX280-20S the Right Cylinder?
Choose this 50 mm bore when you need the 982 N thrust class but require variable end-stops for product changeovers, stepping down from a 63 mm bore (1559 N at 0.5 MPa) to save space and air volume. The adjustable stroke is ideal for machine setup where a fixed SAI cylinder would require repeated physical repositioning. Because the total stroke is 280 mm, ensure an external guide supports the load to prevent excessive side-load wear on the M16x1.5 rod thread.
For ISO 15552 dimensional interchangeability, match the 50 mm bore, 280 mm stroke, 20 mm adjustment range, PT G1/4 port, and the -S magnet requirement. If the application demands true load-holding without continuous air pressure, select a SAIL air-released lock or BSAI clamp-lock cylinder instead of relying on the SAIJ rear stopper. SAIJ supports Basic, FA, LB, TC, FTC, TCM1, and TCM2 mounts.
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 SAIJ50AX280-20S FAQ
At 0.5 MPa, this 50 mm bore cylinder provides 982 N of push force and 825 N of pull force. It operates at speeds between 30 and 800 mm/s.
The rear adjuster screw lets you shorten the 280 mm nominal stroke by up to 20 mm, creating a 260-280 mm travel window. It acts as a physical stop to tune the end position and does not lock the load without air pressure.
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