Airtac SAIJ63 Adjustable Stroke Air Cylinder SAIJ63AX120-20
The AirTAC Airtac SAIJ63 Adjustable Stroke Air Cylinder SAIJ63AX120-20 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 SAIJ63AX120-20
The AirTAC SAIJ63X120-20 is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It features a 63 mm bore delivering 1559 N of push force at 0.5 MPa, paired with a 120 mm nominal stroke that can be fine-tuned down by up to 20 mm, yielding a usable travel window of 100 to 120 mm. This built-in adjustability allows you to dial in exact retract end-positions during commissioning without swapping out the cylinder or adding external stops.
This variant utilizes a SUS420J2 stainless steel rod (material code A) for enhanced corrosion resistance and features PT tapered port threads with a G3/8 connection. The extruded aluminum barrel includes sensor grooves on both sides for flexible switch mounting, while the variable air cushions at both ends manage deceleration. Remember that the rear adjuster functions strictly as a travel stop, not a locking mechanism, so the cylinder cannot hold a load without live air pressure.
Airtac SAIJ63 Adjustable Stroke Air Cylinder SAIJ63AX120-20 Technical Specifications
| Model | Airtac SAIJ63 Adjustable Stroke Air Cylinder SAIJ63AX120-20 |
|---|---|
| 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 SAIJ63AX120-20
| 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 SAIJ63AX120-20 Is Used
Machine Changeover
Quickly fine-tune the 100-120 mm retract end-stop during product size changeovers without disassembling the tooling or swapping cylinders.
End-Position Tuning
Dial in the exact bottoming position during initial commissioning to prevent mechanical interference and optimize cycle timing.
Variable End Stops
Accommodate slight variations in part dimensions on the line by adjusting the stroke length on the fly via the rear stopper screw.
Is the Airtac SAIJ63 Adjustable Stroke Air Cylinder SAIJ63AX120-20 the Right Cylinder?
Selecting this 63 mm bore cylinder makes sense when your application requires the 1559 N push force at 0.5 MPa, but you need precise leeway during machine setup; if you need less force, stepping down to a 50 mm bore provides 982 N, while an 80 mm bore offers 2513 N. The adjustable 100-120 mm travel window is ideal for product changeovers where exact end-positioning varies slightly, replacing the need for a fixed-stroke SAI cylinder. To match this exact configuration for an ISO 15552 replacement, specify the 63 mm bore, 120 mm stroke, 20 mm adjustment, PT G3/8 port, SUS420J2 rod, and no magnet.
Because this model lacks a magnet, it cannot host CMSE or DMSE sensors without changing the piston assembly. Furthermore, the rear stopper and air cushions only set the travel end and decelerate the load; they do not act as a brake. If your setup requires true load-holding without continuous air pressure, consider an external rod lock or explore the SAIL or BSAI cylinder series. Mounting options for this profile cylinder include Basic, FA, LB, TC, FTC, TCM1, and TCM2.
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 SAIJ63AX120-20 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 its maximum 1.0 MPa pressure, it delivers up to 318 kgf.
The rear adjusting screw acts as a mechanical stopper that shortens the effective retract stroke by up to 20 mm. This creates a usable travel window of 100 to 120 mm, allowing you to fine-tune the end position without replacing the cylinder.
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