Airtac SAIJ63 Adjustable Stroke Air Cylinder SAIJ63AX120-75
The AirTAC Airtac SAIJ63 Adjustable Stroke Air Cylinder SAIJ63AX120-75 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø63mm bore and 120mm stroke, G3/8 air ports and adjustable end cushioning. Its standardized mounting interface makes it a drop-in replacement for other ISO 15552 cylinders in automation lines.
- BoreØ63 mm
- Stroke120 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- CushionAdjustable, 36 mm
About the Airtac SAIJ63 Adjustable Stroke Air Cylinder SAIJ63AX120-75
The AirTAC SAIJ63X120-75 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a nominal 120 mm travel that can be dialed back by up to 75 mm, creating a highly flexible 45-120 mm usable stroke window. This broad adjustment range is ideal for product-size changeovers without swapping hardware. The 63 mm bore generates 1559 N of pull force at 0.5 MPa, making it suitable for moderate-to-heavy actuation tasks.
This unit uses a SUS420J2 stainless steel rod (material code A) for enhanced corrosion resistance compared to standard carbon steel. It features PT tapered port threads and operates at speeds of 30-800 mm/s. The rear adjuster acts purely as a mechanical stop for end-position tuning and does not hold the load without live air pressure.
Airtac SAIJ63 Adjustable Stroke Air Cylinder SAIJ63AX120-75 Technical Specifications
| Model | Airtac SAIJ63 Adjustable Stroke Air Cylinder SAIJ63AX120-75 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø63 mm |
| Stroke | 120 mm |
| Acting type | Double acting |
| Port size | G3/8 |
| 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, 36 mm |
| Max stroke | Up to 1500 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 (Ø63mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 1559 N | 1402 N |
| 0.7 MPa | 2182 N | — |
| Max (@1.0 MPa) | 318 kgf | |
Actual usable force is lower than theoretical due to friction and back-pressure. Size with a safety margin.
Model Code: Airtac SAIJ63 Adjustable Stroke Air Cylinder SAIJ63AX120-75
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 63 | Bore size in mm. |
| ×120 | 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 SAIJ63 Adjustable Stroke Air Cylinder SAIJ63AX120-75 Is Used
Machine Changeovers
Rapidly adapt to different product lengths on a packaging line by adjusting the retract stop within the 45-120 mm window without changing cylinder mounts.
End-Position Tuning
Fine-tune the exact retract distance during commissioning to perfect a pressing or forming operation, avoiding the need for external stopper blocks.
Variable End Stops
Handle multiple part sizes in automated clamping stations by simply dialing back the stroke up to 75 mm to accommodate shorter workpieces.
Is the Airtac SAIJ63 Adjustable Stroke Air Cylinder SAIJ63AX120-75 the Right Cylinder?
Choose this 63 mm bore when you need more thrust than the 50 mm variant (which yields 825 N pull at 0.5 MPa) but want to avoid the larger footprint of an 80 mm cylinder. The 75 mm adjustment range is exceptionally large, allowing a single cylinder to handle multiple product formats on the same line by simply turning the rear screw. For fixed-position tasks without changeover needs, a standard SAI cylinder is sufficient.
As an ISO 15552 profile cylinder, it is dimensionally interchangeable with other ISO 15552 cylinders. To match this configuration, specify PT ports, no magnet, and the reduced SAIJ mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2). Note that neither the rear adjuster nor the air cushions function as a lock; for load-holding without live air, consider the SAIL or BSAI series.
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 SAIJ63 Adjustable Stroke Air Cylinder SAIJ63AX120-75 FAQ
At 0.5 MPa operating pressure, this 63 mm bore cylinder generates 1559 N of pull force and 2182 N of push force. At 0.9 MPa, the push force reaches 2805 N.
The rear adjuster screw acts as a mechanical stop that shortens the 120 mm nominal stroke by up to 75 mm. This provides a usable travel window of 45 to 120 mm, allowing you to set the exact retract position without adding external stops.
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