Airtac SAIJ63 Adjustable Stroke Air Cylinder SAIJ63AX125-50S
The AirTAC Airtac SAIJ63 Adjustable Stroke Air Cylinder SAIJ63AX125-50S 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 SAIJ63AX125-50S
The AirTAC SAIJ63X125-50-S is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a usable travel window of 75 to 125 mm, allowing you to dial back the nominal stroke by up to 50 mm during commissioning without adding external stops. With a 63 mm bore, it delivers 1559 N of push force at 0.5 MPa and reaches 2805 N at 0.9 MPa.
This variant includes a SUS420J2 stainless steel piston rod (option A) for enhanced corrosion resistance and uses PT tapered port threads with a G3/8 connection. The integrated magnet supports position sensing via AirTAC CMSE reed or DMSE electronic switches mounted in the dual-side sensor grooves. The rear adjuster functions strictly as a travel stop for end-position tuning and does not hold the load without live air pressure.
Airtac SAIJ63 Adjustable Stroke Air Cylinder SAIJ63AX125-50S Technical Specifications
| Model | Airtac SAIJ63 Adjustable Stroke Air Cylinder SAIJ63AX125-50S |
|---|---|
| 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 SAIJ63AX125-50S
| 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 SAIJ63AX125-50S Is Used
Machine Changeover
Dial in the exact end-of-stroke position within the 75-125 mm window when switching product sizes on a conveyor line, eliminating the need to physically swap cylinders.
Assembly Positioning
Fine-tune the retract distance during initial commissioning to guarantee precise part placement without installing bulky external mechanical stops.
Sensor-Driven Sorting
Leverage the integrated magnet and dual sensor grooves with CMSE or DMSE switches to confirm travel endpoints while adjusting the stroke for varying package dimensions.
Is the Airtac SAIJ63 Adjustable Stroke Air Cylinder SAIJ63AX125-50S the Right Cylinder?
Choose this 63 mm bore adjustable-stroke model when your machine setup requires frequent end-position fine-tuning across a 75 to 125 mm window, such as during product changeovers on a packaging line. If your application needs less force, stepping down to a 50 mm bore yields 982 N at 0.5 MPa; stepping up to an 80 mm bore provides 2513 N at 0.5 MPa. Because this is a 125 mm stroke, side-load risks are moderate, but long unsupported travels still require an external guide. For a direct ISO 15552 replacement, match the 63 mm bore, 125 mm stroke, 50 mm adjustment, PT G3/8 port, and -S magnet. If you need true load-holding without continuous air pressure, use an SAIL pneumatic lock or BSAI clamp-lock cylinder 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 SAIJ63AX125-50S FAQ
At 0.5 MPa operating pressure, this 63 mm bore cylinder provides 1559 N of push force and 1402 N of pull force. At 0.9 MPa, the push force increases to 2805 N.
The rear adjuster screw acts as a mechanical stop that lets you shorten the effective travel from the 125 mm nominal stroke down to a minimum of 75 mm. It is a travel stop for end-position tuning, not a lock, and will not hold the load without live air pressure.
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