This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63AX25S, 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 SI63AX25S
The AirTAC Airtac SI63 Standard Cylinder SI63AX25S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 25mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63AX25S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke25 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63AX25S
- 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 SI63AX25S
The AirTAC SI63AX25S is a discontinued double-acting ISO 15552 profile cylinder with a 63mm bore and 25mm stroke. Delivering 1559N push force at 0.5MPa, it features a SUS420J2 stainless piston rod and a built-in magnet for CS1-B/DS1-B switches. The direct replacement is the SAI63AX25S, matching the G3/8 port, M16x1.5 thread, and ISO 15552 mounting interface.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and long life. The SAI family also adds SAIL, SAIF, and BSAI lock variants lacking in the SI line.
Airtac SI63 Standard Cylinder SI63AX25S Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63AX25S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63AX25S |
| Bore size | Ø63 mm |
| Stroke | 25 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 SAI63AX25S 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 SAI63AX25S 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 SI63AX25S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×25 | 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 SI63AX25S Is Used
Short-Stroke Clamping
Ideal for holding parts during machining with a robust 1559N push force over a compact 25mm travel.
Product Diversion
Provides rapid 25mm actuation to push items off a belt, utilizing the 30-800mm/s speed range.
Pallet Stop Gate
Acts as a heavy-duty stop mechanism on packaging lines, withstanding dynamic impacts via the 30mm cushion.
Replacing the Airtac SI63 Standard Cylinder SI63AX25S with the SAI63AX25S
To replace the SI63AX25S, order the SAI63AX25S keeping the exact 63mm bore, 25mm stroke, -S magnet, and -A SUS420J2 rod. Confirm the ISO 15552 mounting accessory (LB, FA, TC) and G3/8 port. It pushes 1559N at 0.5MPa; if undersized, the 80mm bore yields 2513N. A plain cylinder drifts on air loss as cushions only decelerate; for load holding use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63AX25S
- ✓ 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 SI63AX25S FAQ
Yes, the SI63AX25S is discontinued. The direct replacement is the SAI63AX25S. It is dimensionally interchangeable per ISO 15552, keeping the same 63mm bore, 25mm stroke, G3/8 port, and mounting interface.
This double-acting cylinder uses a G3/8 port. It generates 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 SAI63AX25S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63AX25S replacement — usually within 7-8 hours.