This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63X1800, 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 SI63 Standard Cylinder SI63X1800
The AirTAC Airtac SI63 Standard Cylinder SI63X1800 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 1800mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63X1800, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke1800 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63X1800
- 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 SI63 Standard Cylinder SI63X1800
The AirTAC SI63X1800 is a discontinued double-acting ISO 15552 profile cylinder with an extruded aluminum barrel. Delivering 1559 N push force at 0.5 MPa via a G3/8 port, this 1800 mm stroke unit is a non-standard made-to-order part exceeding the 1500 mm bore maximum. AirTAC replaced it with the SAI63X1800, a direct sharing the same interface, bore, stroke, force, port and mounting.
The SAI upgrade features a refined piston seal with two Y-shaped one-way elements for low start-up pressure and long life. Note this SKU lacks a magnet (-S) and cannot accept CS1-B/DS1-B sensors.
Airtac SI63 Standard Cylinder SI63X1800 Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63X1800 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63X1800 |
| Bore size | Ø63 mm |
| Stroke | 1800 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 SAI63X1800 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 SAI63X1800 produces the same force from the same bore. Actual usable force is lower than theoretical; size with a margin.
Model Code: Airtac SI63 Standard Cylinder SI63X1800
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×1800 | 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 SI63 Standard Cylinder SI63X1800 Is Used
Long-Stroke Transfer
Pushes workpieces between distant machining stations using the full 1800 mm travel distance.
High-Bay Extraction
Extracts pallets from deep storage racks where extended reach and 1559 N push force are required.
Material Ejection
Ejects molded parts from large presses, utilizing the 30 mm adjustable cushions at both ends.
Replacing the Airtac SI63 Standard Cylinder SI63X1800 with the SAI63X1800
To replace this SI with the SAI63X1800, verify the ISO 15552 mounting interface, G3/8 port, M16x1.5 rod thread, and mounting accessory. Size both ways: neighboring bores offer 982 N (50mm) or 2513 N (80mm) push at 0.5 MPa. Because the 1800 mm stroke exceeds the 1500 mm standard, it is non-standard and requires external guides to prevent rod bending under side loads. A plain cylinder drifts on air loss; for load holding use an external rod lock, pilot check valve, or the SAIL/BSAI lock variants. The SAIF variant adds a built-in valve.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63X1800
- ✓ Same bore / stroke / force
- ✓ Port/thread type (PT/G/NPT)
- ✓ Magnet (-S) for sensors?
- ✓ Mounting reused (FA/FB/CA/CB/CR/LB/TC)
Airtac SI63 Standard Cylinder SI63X1800 FAQ
Yes, the SI63X1800 is discontinued. The direct replacement is the AirTAC SAI63X1800. It is dimensionally interchangeable per ISO 15552, matching the 63 mm bore, 1800 mm stroke, 1559 N force, G3/8 port, and mounting fixtures.
The G3/8 port bore delivers 1559 N push and 1402 N pull at 0.5 MPa, 2182 N push at 0.7 MPa, 2805 N at 0.9 MPa, and a 318 kgf max at 1.0 MPa. Speed is 30-800 mm/s. This non-magnetic SKU cannot take sensors.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63X1800
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63X1800 replacement — usually within 7-8 hours.