This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63X120S, 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 SI63X120S
The AirTAC Airtac SI63 Standard Cylinder SI63X120S 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 SAI63X120S, 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 → SAI63X120S
- 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 SI63X120S
The AirTAC SI63X120S is a discontinued double-acting ISO 15552 profile cylinder with a 63mm bore and 120mm stroke. It delivers 1559N push force at 0.5MPa via a G3/8 port. AirTAC replaced this legacy unit with the SAI63X120S, a direct upgrade retaining the exact mounting interface, bore, stroke, output force, and port size.
The SAI upgrade features a modernized piston seal with two Y-shaped one-way elements for low start-up pressure and extended life. The SAI family also introduces lock and valve variants (SAIL, BSAI, SAIF) absent in the SI line.
Airtac SI63 Standard Cylinder SI63X120S Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63X120S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63X120S |
| 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 SAI63X120S 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 SAI63X120S 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 SI63X120S
| 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 SI63X120S Is Used
Clamping Fixtures
Secures mid-weight workpieces with 1559N of push force at 0.5MPa, ideal for machining and welding jigs.
Package Diverting
Drives diverter arms on packaging lines where a 120mm stroke and 79kg vertical lift capacity handle heavy goods.
Pallet Stops
Acts as a robust pneumatic stop mechanism for pallet accumulation zones requiring durable ISO 15552 mounting.
Replacing the Airtac SI63 Standard Cylinder SI63X120S with the SAI63X120S
To replace the SI63X120S, order the SAI63X120S ensuring the ISO 15552 mounting interface, G3/8 port, M16x1.5 rod thread, and magnet (-S) match your fixture. The SAI accepts current AirTAC switches, whereas the legacy SI used CS1-B/DS1-B sensors. Note that plain cylinders drift without live air; for load holding, use an external pilot check valve or the SAIL/BSAI lock variants. Because this is a 120mm stroke, side-load risks are minimal, but always verify rod alignment.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63X120S
- ✓ 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 SI63X120S FAQ
Yes, the SI63X120S is discontinued. The direct replacement is the AirTAC SAI63X120S. It is dimensionally interchangeable per ISO 15552, matching the 63mm bore, 120mm stroke, G3/8 port, and mounting accessories exactly.
The 63mm bore features a G3/8 air port and M16x1.5 rod thread. At 0.5MPa it provides 1559N push and 1402N pull force. At 0.7MPa push is 2182N, and at 0.9MPa it is 2805N. The theoretical maximum force is 318kgf at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63X120S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63X120S replacement — usually within 7-8 hours.