Airtac SAIJ63 Adjustable Stroke Air Cylinder SAIJ63AX120-50S
The AirTAC Airtac SAIJ63 Adjustable Stroke Air Cylinder SAIJ63AX120-50S 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 SAIJ63AX120-50S
The AirTAC SAIJ63X120-50-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster. It provides a usable travel window of 70 to 120 mm, allowing you to dial back the nominal 120 mm stroke by up to 50 mm during commissioning. In the 63 mm bore class, it delivers a push force of 1559 N and a pull force of 1402 N at 0.5 MPa, making it well-suited for moderate to heavy actuation tasks.
This variant includes a SUS420J2 stainless steel rod for improved corrosion resistance and a magnetic piston (-S) for position sensing. It supports AirTAC CMSE reed and DMSE solid-state switches via sensor grooves on both sides of the extruded aluminum barrel. The rear adjuster acts purely as a mechanical stop to set the retract end position and does not hold the load without live air pressure.
Airtac SAIJ63 Adjustable Stroke Air Cylinder SAIJ63AX120-50S Technical Specifications
| Model | Airtac SAIJ63 Adjustable Stroke Air Cylinder SAIJ63AX120-50S |
|---|---|
| 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 SAIJ63AX120-50S
| 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 SAIJ63AX120-50S Is Used
Changeover Calibration
Quickly reconfigure the retract end-stop from 120 mm down to 70 mm when adapting machinery for a new product run.
End-Position Tuning
Fine-tune the stroke during initial commissioning to absorb mechanical tolerances without machining external stops.
Variable End Stops
Set precise retract positions on automated lines where multiple end-of-stroke distances are required from a single cylinder.
Is the Airtac SAIJ63 Adjustable Stroke Air Cylinder SAIJ63AX120-50S the Right Cylinder?
Choose this 63 mm bore adjustable-stroke model when your assembly requires flexible end-position tuning at machine setup or during product changeovers, avoiding the need to swap cylinders or add external stops. If your application requires less force, stepping down to a 50 mm bore yields 982 N of push force at 0.5 MPa. For higher force needs, moving up to an 80 mm bore provides 2513 N.
To replace this cylinder per ISO 15552 dimensions, match the 63 mm bore, 120 mm stroke, 50 mm adjustment, PT tapered port threads, and the -S magnet. Note that the SAIJ mounting set is limited to Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting the FB, CA, CB, and CR styles. If your process requires true load holding without continuous air pressure, consider the SAIL or BSAI series instead of relying on the rear stopper.
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 SAIJ63AX120-50S FAQ
At an operating pressure of 0.5 MPa, this 63 mm bore cylinder generates a push (extend) force of 1559 N and a pull (retract) force of 1402 N. At 0.9 MPa, the push force increases to 2805 N.
The rear adjuster screw allows you to shorten the effective stroke by up to 50 mm. This creates a usable travel window between 70 mm and 120 mm, letting you set the exact retract end-position without changing the cylinder.
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