This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63AX40S, 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 SI63AX40S
The AirTAC Airtac SI63 Standard Cylinder SI63AX40S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 40mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63AX40S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke40 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63AX40S
- 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 SI63AX40S
The AirTAC SI63AX40S is a discontinued double-acting ISO 15552 profile cylinder with a 63 mm bore and 40 mm stroke. It delivers 1559 N push and 1402 N pull at 0.5 MPa, uses a G3/8 port, and features a SUS420J2 stainless piston rod for corrosion resistance. AirTAC replaced this legacy unit with the SAI63AX40S, a direct replacement sharing the exact ISO 15552 mounting interface, bore, stroke, force, and port.
The SAI upgrade introduces a two Y-shaped one-way piston seal for lower start-up pressure and longer life. This magnet-ready model (-S) accepts legacy CS1-B/DS1-B sensors, while the SAI family adds SAIL, SAIF, and BSAI lock variants the SI lacked.
Airtac SI63 Standard Cylinder SI63AX40S Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63AX40S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63AX40S |
| Bore size | Ø63 mm |
| Stroke | 40 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 SAI63AX40S 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 SAI63AX40S 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 SI63AX40S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×40 | 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 SI63AX40S Is Used
Clamp Actuation
Provides 1559 N of clamping force at 0.5 MPa for holding steel workpieces in CNC machining fixtures.
Short-Stroke Diverter
Executes rapid 40 mm lane-changing movements on packaging lines using the 30-800 mm/s speed range.
Pallet Stopper
Acts as a robust pneumatic stop for medium-weight pallets, benefiting from the SUS420J2 stainless rod.
Replacing the Airtac SI63 Standard Cylinder SI63AX40S with the SAI63AX40S
To replace the SI63AX40S, order the SAI63AX40S. Verify the ISO 15552 mounting interface, 40 mm stroke, G3/8 port, and the -S magnet for CS1-B/DS1-B switches. If you need higher force, the neighboring 80 mm bore yields 2513 N push at 0.5 MPa; if smaller, the 50 mm bore gives 982 N. Note that a plain cylinder drifts on air loss—the cushion only decelerates—so use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant for held loads. The 40 mm stroke is short, so side-load risks are minimal, but always guide the load to prevent rod bending.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63AX40S
- ✓ 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 SI63AX40S FAQ
Yes, the SI63AX40S is discontinued. The direct replacement is the SAI63AX40S. It shares the same ISO 15552 mounting interface, 63 mm bore, 40 mm stroke, output force, G3/8 port, and SUS420J2 rod, fitting existing fixtures perfectly.
This 63 mm bore cylinder uses a G3/8 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 max of 318 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63AX40S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63AX40S replacement — usually within 7-8 hours.