This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63AX5S, 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 SI63AX5S
The AirTAC Airtac SI63 Standard Cylinder SI63AX5S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 5mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63AX5S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke5 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63AX5S
- 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 SI63AX5S
The AirTAC SI63AX5S is a discontinued double-acting ISO 15552 profile cylinder with a 63 mm bore and 5 mm stroke, delivering 1559 N push force at 0.5 MPa through its G3/8 port. AirTAC replaced this legacy unit with the SAI63AX5S, a direct replacement retaining the exact ISO 15552 mounting interface, M16x1.5 rod thread, and 30 mm cushions.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and extended life. This specific SI63AX5S variant features a SUS420J2 stainless steel rod (A) and a piston magnet (S) for CS1-B/DS1-B sensors.
Airtac SI63 Standard Cylinder SI63AX5S Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63AX5S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63AX5S |
| Bore size | Ø63 mm |
| Stroke | 5 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 SAI63AX5S 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 SAI63AX5S 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 SI63AX5S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×5 | 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 SI63AX5S Is Used
Short-Stroke Clamping
Ideal for holding parts securely in machining fixtures using its 1559 N push force within a compact 5 mm travel.
Ejector Pins
Provides rapid, precise ejection of finished components from automated tooling at 30-800 mm/s speeds.
Valve Actuation
Drives mechanical diverter valves or gates where a short, powerful 63 mm bore thrust is required.
Replacing the Airtac SI63 Standard Cylinder SI63AX5S with the SAI63AX5S
To replace the SI63AX5S, order the SAI63AX5S to keep the identical ISO 15552 footprint, 63 mm bore, 5 mm stroke, G3/8 port, and SUS420J2 rod. Retain your existing mounting hardware and confirm the magnet (S) for current AirTAC switches. If you need more force, the 80 mm bore yields 2513 N push at 0.5 MPa; if less is required, the 50 mm bore provides 982 N. Remember that a standard cylinder drifts without live air—the cushion only decelerates—so use an external pilot check valve or the SAIL/BSAI lock variant for load holding. At this short 5 mm stroke, side-load risks are minimal, but ensure precise rod alignment to prevent binding.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63AX5S
- ✓ 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 SI63AX5S FAQ
Yes, the AirTAC SI63AX5S is discontinued. The direct replacement is the SAI63AX5S, which shares the identical ISO 15552 mounting interface, 63 mm bore, 5 mm stroke, G3/8 port, and force ratings.
This 63 mm bore double-acting cylinder uses a G3/8 port and provides 1559 N push / 1402 N pull at 0.5 MPa, 2182 N push at 0.7 MPa, 2805 N at 0.9 MPa, and a maximum theoretical force of 318 kgf at 1.0 MPa.
Request a Quote for the SAI63AX5S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63AX5S replacement — usually within 7-8 hours.