This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63AX120, 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 SI63AX120
The AirTAC Airtac SI63 Standard Cylinder SI63AX120 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 SAI63AX120, 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 → SAI63AX120
- 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 SI63AX120
The AirTAC SI63AX120 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. The direct replacement is the SAI63AX120, matching the bore, stroke, force, port and ISO 15552 mounting interface exactly.
This SKU features a SUS420J2 stainless rod but lacks a magnet, so it cannot take a sensor. The SAI upgrade uses two Y-shaped piston seals for low start-up pressure.
Airtac SI63 Standard Cylinder SI63AX120 Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63AX120 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63AX120 |
| 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 SAI63AX120 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 SAI63AX120 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 SI63AX120
| 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 SI63AX120 Is Used
Mid-Tonnage Clamping
Secures heavy workpieces in CNC machining fixtures using its 1559N push force at 0.5MPa.
Package Diversion
Actuates routing gates on high-speed packaging lines with a 30-800mm/s speed range.
Pallet Stopping
Halts loaded pallets at transfer stations, relying on the 63mm bore's 1402N pull force.
Replacing the Airtac SI63 Standard Cylinder SI63AX120 with the SAI63AX120
To replace the SI63AX120, order the SAI63AX120. Verify the ISO 15552 mounting interface, 120mm stroke, G3/8 port and the -A SUS420J2 rod. Because this SKU lacks a -S magnet, it cannot accept CS1-B/DS1-B sensors. For sizing, the 50mm bore yields 982N push at 0.5MPa, while the 80mm bore yields 2513N. The cushion only decelerates; for load holding on air loss, use an external pilot check valve or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63AX120
- ✓ 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 SI63AX120 FAQ
Yes, the SI63AX120 is discontinued. The direct replacement is the SAI63AX120, which shares the same ISO 15552 mounting interface, 63mm bore, 120mm stroke, G3/8 port and output force.
It has a G3/8 port. Force ratings are 1559N push and 1402N pull at 0.5MPa, 2182N push at 0.7MPa, 2805N push at 0.9MPa, and a theoretical max of 318kgf at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63AX120
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63AX120 replacement — usually within 7-8 hours.