Airtac SAIJ63 Adjustable Stroke Air Cylinder SAIJ63AX300-75
The AirTAC Airtac SAIJ63 Adjustable Stroke Air Cylinder SAIJ63AX300-75 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø63mm bore and 300mm 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
- Stroke300 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- CushionAdjustable, 36 mm
About the Airtac SAIJ63 Adjustable Stroke Air Cylinder SAIJ63AX300-75
The AirTAC SAIJ63X300-75 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, allowing you to dial back the nominal 300 mm travel to a precise 225-300 mm window without swapping hardware. It delivers 1559 N of pull force at 0.5 MPa, making it well-suited for mid-range positioning tasks. The extruded aluminum barrel features sensor grooves on both sides for flexible switch placement.
This configuration uses a SUS420J2 stainless steel rod for enhanced corrosion resistance and accepts PT tapered port threads. The rear adjustment screw acts purely as a mechanical stop to set the retract end-position; it does not lock the load without live air pressure. For load-holding requirements, consider the SAIL or BSAI series instead.
Airtac SAIJ63 Adjustable Stroke Air Cylinder SAIJ63AX300-75 Technical Specifications
| Model | Airtac SAIJ63 Adjustable Stroke Air Cylinder SAIJ63AX300-75 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø63 mm |
| Stroke | 300 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 SAIJ63AX300-75
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 63 | Bore size in mm. |
| ×300 | 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 SAIJ63AX300-75 Is Used
Product Changeovers
Dial in the 225-300 mm travel window during format changes to accommodate different package sizes without replacing the cylinder.
End-Stop Tuning
Fine-tune the retract position at commissioning using the rear screw, avoiding the need to add physical shims to the machine frame.
Assembly Positioning
Leverage the 1559 N pull force to move mid-weight jigs into place, adjusting the stopper to perfect the final resting position.
Is the Airtac SAIJ63 Adjustable Stroke Air Cylinder SAIJ63AX300-75 the Right Cylinder?
Choose this 63 mm bore when 50 mm (825 N pull at 0.5 MPa) is too weak and 80 mm (2268 N pull) provides excessive force. The 75 mm adjustment range is ideal for product-size changeovers, letting you shorten the stroke by up to 75 mm on the fly rather than machining external stops. If you need to hold a load vertically without continuous air, the SAIJ adjuster will not suffice—you must step up to a SAIL (air-released lock) or BSAI (clamp-lock) cylinder.
Because the 300 mm stroke is relatively long, the 20 mm rod diameter and M16x1.5 rod thread will still experience side-loading forces if the load is unsupported; always guide the tooling externally. To replace an ISO 15552 cylinder, match the 63 mm bore, 300 mm stroke, 75 mm adjustment, G3/8 PT ports, and your required mounting from the SAIJ subset (Basic, FA, LB, TC, FTC, TCM1, TCM2). Note that FB, CA, CB, and CR mounts are omitted from this adjustable 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 SAIJ63AX300-75 FAQ
The rear adjuster screw acts as a mechanical stop that lets you shorten the effective stroke from 300 mm down to as little as 225 mm. It sets the travel end and deceleration point, but it is not a lock—the cylinder requires live air pressure to hold its position.
At 0.5 MPa operating pressure, it provides 1559 N of pull force and 1402 N of push force. At the maximum 1.0 MPa pressure, it can deliver up to 318 kgf.
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