This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63X1200LB, 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 SI63X1200LB
The AirTAC Airtac SI63 Standard Cylinder SI63X1200LB is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 1200mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63X1200LB, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke1200 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63X1200LB
- 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 SI63X1200LB
The AirTAC SI63X1200LB is a discontinued double-acting ISO 15552 profile cylinder with an LB foot mount. Built for a 63 mm bore and 1200 mm stroke, it delivers 1559 N push force at 0.5 MPa through a G3/8 port. Because this legacy unit lacks a magnet (-S), it cannot accept position switches. AirTAC replaced it with the SAI63X1200LB direct upgrade.
The SAI63X1200LB matches the exact ISO 15552 mounting interface, bore, stroke, output force, port and LB accessory. It features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life. The SAI family also adds SAIL, SAIF and BSAI lock variants the SI line lacked.
Airtac SI63 Standard Cylinder SI63X1200LB Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63X1200LB |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63X1200LB |
| Bore size | Ø63 mm |
| Stroke | 1200 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 SAI63X1200LB 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 SAI63X1200LB 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 SI63X1200LB
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×1200 | 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 SI63X1200LB Is Used
Long-Stroke Material Transfer
Pushes workpieces between machining stations over a 1200 mm span, utilizing the 1559 N thrust at 0.5 MPa to move heavy jigs along an assembly conveyor.
Pallet Push-Off Mechanism
Actuates a 79 kg vertical lift or horizontal pusher on a packaging line, requiring the LB foot mount to secure the 63 mm bore body against high reaction forces.
Automated Door Operation
Opens and closes large industrial blast doors or safety gates, where the 1200 mm stroke provides full clearance and the adjustable cushion decelerates the 20 mm rod smoothly.
Replacing the Airtac SI63 Standard Cylinder SI63X1200LB with the SAI63X1200LB
To replace the SI63X1200LB, order the SAI63X1200LB. Confirm the ISO 15552 interface, 63 mm bore, 1200 mm stroke, G3/8 port, LB foot mount, and thread type (PT/G/NPT). Since this SKU has no magnet, it cannot hold a sensor; if sensing is needed, order an SAI with the S suffix for current AirTAC switches. Sizing both ways: a 50 mm bore gives 982 N push @0.5 MPa, while an 80 mm bore yields 2513 N. Note that a plain cylinder drifts on air loss—the cushion only decelerates. For load holding, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant. Finally, at 1200 mm stroke, prevent rod bending by guiding the load externally to avoid side-load damage.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63X1200LB
- ✓ 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 SI63X1200LB FAQ
Yes, the SI63X1200LB is discontinued. The direct replacement is the SAI63X1200LB. It shares the identical ISO 15552 mounting interface, 63 mm bore, 1200 mm stroke, output force, G3/8 port, and LB foot mount, fitting directly into your existing fixtures.
The 63 mm bore uses a G3/8 port. At 0.5 MPa it provides 1559 N push and 1402 N pull force. At 0.7 MPa push is 2182 N, and at 0.9 MPa it is 2805 N. The theoretical maximum force is 318 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63X1200LB
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63X1200LB replacement — usually within 7-8 hours.