Airtac SAIJ63 Adjustable Stroke Air Cylinder SAIJ63AX135-20
The AirTAC Airtac SAIJ63 Adjustable Stroke Air Cylinder SAIJ63AX135-20 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø63mm bore and 135mm 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
- Stroke135 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- CushionAdjustable, 36 mm
About the Airtac SAIJ63 Adjustable Stroke Air Cylinder SAIJ63AX135-20
The AirTAC SAIJ63X135-20 is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It provides a 115-135 mm usable travel window, allowing you to dial back the nominal 135 mm stroke by up to 20 mm. Delivering 1559 N of push force at 0.5 MPa, it fits medium-force applications perfectly. The extruded aluminum barrel features sensor grooves on both sides for flexible switch placement.
This specific configuration uses SUS420J2 stainless steel for the piston rod (material code A) and PT tapered port threads (G3/8). The rear adjuster acts purely as a mechanical stop to fine-tune the retract end position during commissioning or product changeover, without requiring you to swap the cylinder or bolt on external stops. It is not a locking device and cannot hold a load without live air pressure.
Airtac SAIJ63 Adjustable Stroke Air Cylinder SAIJ63AX135-20 Technical Specifications
| Model | Airtac SAIJ63 Adjustable Stroke Air Cylinder SAIJ63AX135-20 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø63 mm |
| Stroke | 135 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 SAIJ63AX135-20
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 63 | Bore size in mm. |
| ×135 | 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 SAIJ63AX135-20 Is Used
Machine Setup Tuning
Dial in the exact 115-135 mm retract position during initial commissioning without machining custom spacers or changing the cylinder.
Product Size Changeover
Quickly adjust the end-stop by up to 20 mm to accommodate a slightly shorter product variant running on the same conveyor line.
Fixture Positioning
Fine-tune the clamping travel on a 63 mm bore fixture to ensure precise contact force (1559 N at 0.5 MPa) across different part tolerances.
Is the Airtac SAIJ63 Adjustable Stroke Air Cylinder SAIJ63AX135-20 the Right Cylinder?
Choose this 63 mm bore when your application requires roughly 1559 N of push force at 0.5 MPa, stepping up from a 50 mm bore (982 N) or down from an 80 mm bore (2513 N). An adjustable stroke is preferred over a fixed SAI cylinder when you need variable end-stops to accommodate minor product size changes on a line. For load-holding without live air, this cylinder is insufficient as the rear adjuster is only a travel stop; you would need to specify a SAIL (air-released lock) or BSAI (clamp-lock) cylinder instead.
To replace this exact ISO 15552 unit, match the 63 mm bore, 135 mm stroke, 20 mm adjustment range, G3/8 PT ports, and SUS420J2 rod material. The mounting interface supports Basic, FA, LB, TC, FTC, TCM1, and TCM2 accessories. As a standard 135 mm stroke under the 1500 mm maximum, it operates efficiently within the 30-800 mm/s speed range.
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 SAIJ63AX135-20 FAQ
The rear adjuster screw acts as a mechanical stop, letting you shorten the effective stroke from 135 mm down to 115 mm. This creates a 20 mm adjustable window for fine-tuning the end position at commissioning. The adjuster only sets the travel end; it does not lock or hold the load without live air pressure.
At 0.5 MPa operating pressure, the SAIJ63X135-20 provides 1559 N of push force and 1402 N of pull force. At its maximum rated pressure of 1.0 MPa, it delivers up to 318 kgf of push force.
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