Airtac SAIJ63 Adjustable Stroke Air Cylinder SAIJ63AX125-20
The AirTAC Airtac SAIJ63 Adjustable Stroke Air Cylinder SAIJ63AX125-20 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø63mm bore and 125mm 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
- Stroke125 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- CushionAdjustable, 36 mm
About the Airtac SAIJ63 Adjustable Stroke Air Cylinder SAIJ63AX125-20
The AirTAC SAIJ63X125-20 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a usable travel window of 105 to 125 mm, allowing you to dial in the exact retract end-position during commissioning without swapping hardware. Built with a 63 mm bore, it delivers a robust 1559 N push force at 0.5 MPa and 1402 N pull force.
This variant utilizes a SUS420J2 stainless steel rod (material code A) for enhanced corrosion resistance and features a PT tapered port thread (G3/8). The extruded aluminum barrel includes sensor grooves on both sides, ready to accept AirTAC CMSE reed or DMSE electronic switches if a magnet is added later. The rear adjuster functions strictly as a travel stop for deceleration, not a load-holding lock.
Airtac SAIJ63 Adjustable Stroke Air Cylinder SAIJ63AX125-20 Technical Specifications
| Model | Airtac SAIJ63 Adjustable Stroke Air Cylinder SAIJ63AX125-20 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø63 mm |
| Stroke | 125 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 SAIJ63AX125-20
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 63 | Bore size in mm. |
| ×125 | 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 SAIJ63AX125-20 Is Used
Changeover Calibration
Fine-tune the 105-125 mm retract distance precisely during machine changeovers to handle varying product widths without adding external stopper blocks.
Adjustable Diverting
Provides adjustable end-positioning for diverter arms on packaging lines, allowing operators to trim the 20 mm stroke window to match package dimensions.
Assembly Pressing
Delivers 1559 N of thrust at 0.5 MPa for pressing operations, with the rear screw allowing exact depth calibration without reprogramming pneumatic valves.
Is the Airtac SAIJ63 Adjustable Stroke Air Cylinder SAIJ63AX125-20 the Right Cylinder?
Select this 63 mm bore cylinder when an application requires precise end-stop tuning on the fly, such as accommodating slight product size variations on a conveyor. It generates 1559 N of thrust at 0.5 MPa; if your process demands less force, stepping down to a 50 mm bore yields 982 N, while upgrading to an 80 mm bore provides 2513 N.
Because the stroke is 125 mm, side-load stress is moderate, but always ensure proper external guiding for optimal seal life. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2, intentionally omitting FB, CA, CB, and CR options. If your setup requires the load to remain fixed without continuous live air pressure, pair this cylinder with an external pilot-operated check valve or select an AirTAC SAIL or BSAI locking model instead.
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 SAIJ63AX125-20 FAQ
The rear adjuster screw allows you to shorten the effective stroke by up to 20 mm. This creates a usable travel window of 105 to 125 mm, letting you set the exact retract end-position at commissioning. The adjuster acts as a mechanical stop and does not lock the load without live air.
At a standard operating pressure of 0.5 MPa, the SAIJ63X125-20 generates 1559 N of push force and 1402 N of pull force. At its maximum rated pressure of 1.0 MPa, it can deliver up to 318 kgf of thrust.
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