This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63AX120S, 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 SI63AX120S
The AirTAC Airtac SI63 Standard Cylinder SI63AX120S 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 SAI63AX120S, 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 → SAI63AX120S
- 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 SI63AX120S
The AirTAC SI63AX120S 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 through a G3/8 port. The direct replacement is the SAI63AX120S, matching the interface, force, and stroke.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure, and adds SAIL, SAIF, and BSAI variants the SI lacked. This -A rod uses SUS420J2 stainless steel, and the -S magnet works with legacy CS1-B/DS1-B sensors.
Airtac SI63 Standard Cylinder SI63AX120S Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63AX120S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63AX120S |
| 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 SAI63AX120S 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 SAI63AX120S 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 SI63AX120S
| 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 SI63AX120S Is Used
Stainless Rod Actuation
Leverages the SUS420J2 rod for corrosion resistance in damp machining cells while providing 1559 N push force at 0.5 MPa.
Fixture Clamping
Holds workpieces securely with 1402 N pull force at 0.5 MPa, relying on live air pressure to maintain the clamp.
Replacing the Airtac SI63 Standard Cylinder SI63AX120S with the SAI63AX120S
To replace the SI63AX120S, order the SAI63AX120S. Verify the ISO 15552 mounting interface, 120 mm stroke, G3/8 port, and SUS420J2 stainless rod. The built-in magnet (-S) accepts legacy CS1-B/DS1-B switches, though the SAI uses current AirTAC sensors. If sizing up, the 80 mm bore offers 2513 N push at 0.5 MPa; if sizing down, the 50 mm bore provides 982 N. For load holding, note that a plain cylinder drifts on air loss—the cushion only decelerates. Use an external pilot check valve or the SAIL lock variant to hold loads.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63AX120S
- ✓ 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 SI63AX120S FAQ
Yes, the AirTAC SI63AX120S is discontinued. The direct replacement is the SAI63AX120S. It is dimensionally interchangeable per ISO 15552, retaining the same 63 mm bore, 120 mm stroke, force, G3/8 port, and mounting fixtures.
This double-acting cylinder features a G3/8 air port. It delivers 1559 N push and 1402 N pull at 0.5 MPa, 2182 N push at 0.7 MPa, 2805 N push at 0.9 MPa, and a theoretical maximum force of 318 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63AX120S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63AX120S replacement — usually within 7-8 hours.