Airtac SAIJ63 Adjustable Stroke Air Cylinder SAIJ63AX125-75S
The AirTAC Airtac SAIJ63 Adjustable Stroke Air Cylinder SAIJ63AX125-75S 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 SAIJ63AX125-75S
The AirTAC SAIJ63X125-75-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, allowing you to dial back the nominal 125 mm travel by up to 75 mm. This yields a usable end-position window of 50 to 125 mm, providing immense flexibility during machine commissioning or product changeovers without swapping out the physical actuator. In the 63 mm bore class, it delivers a robust 1559 N of push force and 1402 N of pull force at 0.5 MPa, making it well-suited for moderate-to-heavy positioning tasks.
This specific SKU is factory-configured with a SUS420J2 stainless steel rod for enhanced durability against moisture and a PT tapered port thread for a tight, reliable seal. The integrated magnet (-S) enables direct compatibility with AirTAC CMSE reed and DMSE electronic solid-state sensors, which seat cleanly into the extruded aluminum barrel's dual sensor grooves. The rear adjuster functions purely as a mechanical stop to set the travel end, meaning it will not hold a load without live air pressure; for true fail-safe load holding, consider the SAIL or BSAI series.
Airtac SAIJ63 Adjustable Stroke Air Cylinder SAIJ63AX125-75S Technical Specifications
| Model | Airtac SAIJ63 Adjustable Stroke Air Cylinder SAIJ63AX125-75S |
|---|---|
| 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 SAIJ63AX125-75S
| 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 SAIJ63AX125-75S Is Used
Variable End-Stop Tuning
Dial in the exact retract position within a 50-125 mm window during machine commissioning without replacing the actuator or adding external stopper blocks.
Product Changeover
Quickly adapt the cylinder's effective stroke on packaging or sorting lines when handling different product sizes, minimizing downtime between runs.
Precision Positioning
Leverage the 1559 N push force and fine-tuned travel end to accurately push or align moderate loads into fixtures before a secondary operation.
Is the Airtac SAIJ63 Adjustable Stroke Air Cylinder SAIJ63AX125-75S the Right Cylinder?
Choose this adjustable 63 mm bore actuator when your application demands variable end-stops rather than a fixed 125 mm stroke. If your process requires less force, stepping down to a 50 mm bore provides 982 N of push force at 0.5 MPa, whereas moving up to an 80 mm bore yields 2513 N for heavier payloads. The adjustable stroke mechanism is ideal for fine-tuning retract positions on the fly, eliminating the need to bolt on external stops or machine a new cylinder when product dimensions change slightly.
When replacing an ISO 15552 cylinder, match the 63 mm bore, 125 mm nominal stroke, 75 mm adjustment range, PT G3/8 port, and the -S magnet requirement. SAIJ supports a reduced mounting set including Basic, FA, LB, TC, FTC, TCM1, and TCM2, deliberately omitting FB, CA, CB, and CR brackets. Since the 125 mm stroke is well under the 300 mm side-load threshold, standard mounting is highly rigid, though long unsupported loads should still use an external guide.
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 SAIJ63AX125-75S FAQ
At a 0.5 MPa operating pressure, this 63 mm bore cylinder generates 1559 N of push force and 1402 N of pull force. At the maximum 1.0 MPa pressure, it can deliver up to 318 kgf.
A rear-mounted adjusting screw acts as a mechanical stop, allowing you to shorten the effective stroke from its 125 mm nominal length down to as little as 50 mm. This stopper sets the travel end but does not lock or hold the load without continuous air pressure.
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