This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63X120, 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 SI63X120
The AirTAC Airtac SI63 Standard Cylinder SI63X120 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 120mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63X120, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke120 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63X120
- 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 SI63X120
The AirTAC SI63X120 is a discontinued double-acting ISO 15552 profile cylinder with a 63mm bore and 120mm stroke. It delivers 1559N push and 1402N pull at 0.5MPa using a G3/8 port. AirTAC replaced this legacy unit with the SAI63X120, a direct upgrade sharing the exact ISO 15552 mounting interface, bore, stroke, force, and accessories. The SAI features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life.
Since this specific SKU lacks the -S magnet suffix, it cannot accept a position sensor. For load holding, note that a standard cylinder drifts on air loss; the cushion only decelerates. Use an external rod lock or pilot check valve, or step up to the SAIL or BSAI lock variants.
Airtac SI63 Standard Cylinder SI63X120 Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63X120 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63X120 |
| 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, 30 mm |
| Max standard stroke | Up to 1500 mm |
Specifications follow the official AirTAC SI datasheet (now discontinued). The SAI63X120 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 SAI63X120 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 SI63X120
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×120 | 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 SI63X120 Is Used
Package Diverting
Drives diverter arms on packaging lines where the 1559N push force at 0.5MPa easily redirects heavy cartons without bounce.
Clamp Actuation
Secures heavy steel workpieces in machining fixtures, utilizing the 1402N pull force to hold parts firmly during milling.
Pallet Stops
Functions as a robust pneumatic stop gate on roller conveyors, reliably halting loaded pallets up to the 79kg vertical lift limit.
Replacing the Airtac SI63 Standard Cylinder SI63X120 with the SAI63X120
To replace the SI63X120, order the SAI63X120 keeping the identical ISO 15552 mounting interface, 120mm stroke, G3/8 port, and M16x1.5 rod thread. Confirm your mounting accessory (LB, FA, TC, etc.) and note this no-S SKU cannot take a sensor. If you need position feedback, select the SAI63X120S instead. Sizing both ways: the 63mm bore gives 1559N push at 0.5MPa; if you need less force, the 50mm bore offers 982N, while the 80mm bore provides 2513N. For load holding on air loss, the cushion only decelerates; add a pilot check valve or choose the SAIL lock variant. At 120mm stroke, side-load risks are low, but always guide the load to prevent rod bending.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63X120
- ✓ 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 SI63X120 FAQ
Yes, the SI63X120 is discontinued. The direct replacement is the AirTAC SAI63X120. It shares the identical ISO 15552 mounting interface, 63mm bore, 120mm stroke, G3/8 port, and output force, fitting existing fixtures perfectly while adding an upgraded piston seal.
The 63mm bore features a G3/8 air port and M16x1.5 rod thread. It generates 1559N push and 1402N pull at 0.5MPa, 2182N push at 0.7MPa, 2805N push at 0.9MPa, and a theoretical maximum of 318kgf at 1.0MPa. Operating speed is 30-800mm/s.
Request a Quote for the SAI63X120
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63X120 replacement — usually within 7-8 hours.