Airtac SAIJ63 Adjustable Stroke Air Cylinder SAIJ63AX120-20S
The AirTAC Airtac SAIJ63 Adjustable Stroke Air Cylinder SAIJ63AX120-20S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø63mm bore and 120mm 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
- Stroke120 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- CushionAdjustable, 36 mm
About the Airtac SAIJ63 Adjustable Stroke Air Cylinder SAIJ63AX120-20S
The AirTAC SAIJ63X120-20-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster, providing a usable travel window of 100-120 mm from its 120 mm nominal stroke. Featuring a 20 mm piston rod and a G3/8 port, it delivers a push force of 1559 N and a pull force of 1402 N at 0.5 MPa. This bore size hits a practical middle ground for mid-range automation tasks, supplying up to 318 kgf of maximum push force at 1.0 MPa.
This unit includes a magnet for position sensing with CMSE reed and DMSE electronic solid-state switches. The piston rod is constructed from SUS420J2 stainless steel for improved corrosion resistance, and it uses PT tapered port threads. The rear adjustment screw allows you to dial in the exact retract end-position during commissioning without adding external stops. Remember that this adjuster acts only as a travel stop and does not function as a load-holding lock; for position holding without live air pressure, consider the SAIL or BSAI series.
Airtac SAIJ63 Adjustable Stroke Air Cylinder SAIJ63AX120-20S Technical Specifications
| Model | Airtac SAIJ63 Adjustable Stroke Air Cylinder SAIJ63AX120-20S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø63 mm |
| Stroke | 120 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 SAIJ63AX120-20S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 63 | Bore size in mm. |
| ×120 | 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 SAIJ63AX120-20S Is Used
Machine Changeover
Dial in the 100-120 mm travel window during product size transitions to set new retract endpoints without physically swapping the cylinder.
End-Position Tuning
Fine-tune the final retract position during commissioning using the rear stopper screw to perfect machine timing and mechanical alignment.
Sensor-Driven Setup
Leverage the integrated magnet with CMSE or DMSE switches to confirm the adjusted end-of-stroke position for automated sequencing.
Is the Airtac SAIJ63 Adjustable Stroke Air Cylinder SAIJ63AX120-20S the Right Cylinder?
Choose this 63 mm bore adjustable-stroke cylinder when your machine setup requires variable end-stops or frequent product changeovers, stepping up from a 50 mm bore (which provides 982 N push at 0.5 MPa) to handle heavier actuation demands. An adjustable stroke is highly beneficial over a fixed-stroke SAI cylinder when you need to fine-tune the retract distance on the fly rather than swapping the entire actuator.
As a dimensionally interchangeable ISO 15552 cylinder, the replacement match for this SKU is: 63 mm bore, 120 mm stroke, 20 mm adjustment, PT thread port, and an -S magnet. It supports a reduced mounting subset of Basic, FA, LB, TC, FTC, TCM1, and TCM2 (omitting FB, CA, CB, and CR). Because the 120 mm stroke is under 300 mm, side-load stress on the rod is minimal, 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 SAIJ63AX120-20S FAQ
At a 0.5 MPa operating pressure, this 63 mm bore cylinder provides a push force of 1559 N and a pull force of 1402 N. At the maximum 1.0 MPa pressure, it delivers up to 318 kgf of push force.
The rear adjuster screw lets you shorten the 120 mm nominal stroke by up to 20 mm, creating a 100-120 mm usable travel window. It functions as a mechanical stop to set the end position and is not a lock, meaning the cylinder requires live air to hold its load.
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