This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63X120STC, 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 SI63X120STC
The AirTAC Airtac SI63 Standard Cylinder SI63X120STC 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 SAI63X120STC, 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 → SAI63X120STC
- 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 SI63X120STC
The AirTAC SI63X120STC is a discontinued double-acting ISO 15552 profile cylinder with a 63 mm bore and 120 mm stroke. It delivers 1559 N push force at 0.5 MPa via a G3/8 port. AirTAC replaced this legacy unit with the SAI63X120STC, a direct upgrade sharing the exact ISO 15552 mounting interface, bore, stroke, force, and TC trunnion mount.
The SAI upgrade features a new piston seal with two Y-shaped one-way elements for low start-up pressure and extended life. The SAI family also adds SAIL, SAIF, and BSAI lock variants absent in the SI line. Your -S magnet works with legacy CS1-B/DS1-B sensors.
Airtac SI63 Standard Cylinder SI63X120STC Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63X120STC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63X120STC |
| 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 SAI63X120STC 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 SAI63X120STC 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 SI63X120STC
| 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 SI63X120STC Is Used
Package Diversion
Pushes medium-weight cartons off a main conveyor line using the 1559 N push force at 0.5 MPa with reliable TC trunnion mounting.
Clamp Actuation
Secures aluminum extrusions during machining operations, providing stable clamping via the 120 mm stroke and double-acting profile barrel.
Pallet Stopper
Acts as a pneumatic stop for incoming pallets on roller conveyors, absorbing kinetic energy through the 30 mm adjustable air cushions.
Replacing the Airtac SI63 Standard Cylinder SI63X120STC with the SAI63X120STC
To replace the SI63X120STC, order the SAI63X120STC. Confirm the ISO 15552 TC trunnion interface, 63 mm bore, 120 mm stroke, G3/8 port, and the -S magnet for CS1-B/DS1-B switches. Sizing context: a 50 mm bore yields 982 N push at 0.5 MPa, while an 80 mm bore yields 2513 N. This plain cylinder lacks load-holding; air loss causes drift, as cushions only decelerate. For secure holding, use an external pilot check valve or explore the SAIL or BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63X120STC
- ✓ 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 SI63X120STC FAQ
Yes, the SI63X120STC is discontinued. The direct replacement is the SAI63X120STC. It shares the identical ISO 15552 mounting interface, 63 mm bore, 120 mm stroke, output force, G3/8 port, and TC mounting, fitting directly into existing fixtures.
It features a G3/8 air port and provides 1559 N push / 1402 N pull at 0.5 MPa, 2182 N push at 0.7 MPa, 2805 N push at 0.9 MPa, and a theoretical max of 318 kgf at 1.0 MPa. The piston rod is Ø20 mm with an M16x1.5 thread.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63X120STC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63X120STC replacement — usually within 7-8 hours.