This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAIJ63X50-20, with the same bore, stroke, output force, port and mounting, so it fits the same application. The SAI replacement keeps the same ISO 15552 mounting interface, bore, stroke, output force and accessories, so it drops straight into existing fixtures. It is the current-production version of this cylinder with an upgraded piston seal.
Airtac SIJ63 Double Rod Adjustable Cylinder SIJ63X50-20
The AirTAC SIJ63 Double Rod Adjustable Cylinder SIJ63X50-20 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 50mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAIJ63X50-20, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke50 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAIJ63X50-20
- No minimum order. A single piece can be ordered.
- Ready in 3–5 business days. That is the time we take to process the order and hand it to the carrier. Transit time after that depends on the destination.
About the Airtac SIJ63 Double Rod Adjustable Cylinder SIJ63X50-20
The AirTAC SIJ63X50-20 is a discontinued double-acting double-rod ISO 15552 adjustable-stroke cylinder with a 63 mm bore and 50 mm maximum extend stroke. An external stop screw lets you trim the extend stroke by up to 20 mm on-site, yielding a usable 30-50 mm window. The direct replacement is the SAIJ63X50-20, matching the interface, force, and mounting.
The SAIJ successor retains the upgraded SAI piston seal (two Y-shaped one-way elements for low start-up pressure and long life) and enables ISO 15552 mounting reuse. Note this SKU lacks a -S magnet, so it cannot accept a sensor. The stop screw sets end position but is not a lock; cylinders drift on air loss, so use an external rod lock for held loads.
Airtac SIJ63 Double Rod Adjustable Cylinder SIJ63X50-20 Technical Specifications
| Model | Airtac SIJ63 Double Rod Adjustable Cylinder SIJ63X50-20 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAIJ63X50-20 |
| Bore size | Ø63 mm |
| Stroke | 50 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, 30 mm |
| Max standard stroke | Up to 1500 mm |
Specifications follow the official AirTAC SI datasheet (now discontinued). The SAIJ63X50-20 carries the same ISO 15552 ratings. Confirm against the product label before installation. Thread options: PT / G / 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 | |
The SAIJ63X50-20 produces the same force from the same bore. Actual usable force is lower than theoretical; size with a margin.
Model Code: Airtac SIJ63 Double Rod Adjustable Cylinder SIJ63X50-20
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×50 | Stroke length in mm. |
| -S | Optional built-in magnet for sensor position sensing. |
Legacy SI-family variants: SID (double rod), SIJ (adjustable stroke) — each maps to its SAI equivalent (SID→SAID, SIJ→SAIJ). Rod material: carbon steel (blank) / SUS420J2 (A) / SUS304 (B).
Where the Airtac SIJ63 Double Rod Adjustable Cylinder SIJ63X50-20 Is Used
Press Fit Stops
Trimming the extend stroke by up to 20 mm on-site allows operators to set precise bottoming positions for light-duty press fit operations without machining spacers.
Transfer Diverter Setup
Field tuning the 50 mm maximum stroke lets maintenance teams adjust diverter gate endpoints on a conveyor line to accommodate varying package sizes.
Pallet Positioning
The external stop screw provides a mechanical end-position reference for aligning pallets, ensuring consistent placement before downstream wrapping processes.
Replacing the Airtac SIJ63 Double Rod Adjustable Cylinder SIJ63X50-20 with the SAIJ63X50-20
To replace the discontinued SIJ63X50-20, order the direct replacement SAIJ63X50-20. Choose the 20 mm adjust window to fine-tune the extend end position on-site. Mounting options include FA, LB, and TC brackets. Because this SKU lacks the -S magnet, it cannot accept legacy CS1-B/DS1-B sensors. For strokes at or above 300 mm, verify side-load limits to prevent guide wear.
Replacement checklist
- ✓ Same ISO 15552 interface → SAIJ63X50-20
- ✓ Same bore / stroke / force
- ✓ Port/thread type (PT/G/NPT)
- ✓ Magnet (-S) for sensors?
- ✓ Mounting reused (FA/FB/CA/CB/CR/LB/TC)
Airtac SIJ63 Double Rod Adjustable Cylinder SIJ63X50-20 FAQ
Yes, the SIJ63X50-20 is discontinued. The direct replacement is the SAIJ63X50-20. It shares the same ISO 15552 interface, 63 mm bore, 50 mm stroke, 20 mm adjust window, G3/8 port, and mounting options, while adding the upgraded SAI piston seal.
The external stop screw window is 20 mm, allowing you to shorten the 50 mm nominal extend stroke down to 30 mm. The stop sets end position and is not a load lock.
Related AirTAC SAI Cylinders
Request a Quote for the SAIJ63X50-20
Send us the quantity and destination. We confirm price, stock and lead time on the SAIJ63X50-20 replacement — usually within 7-8 hours.