This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63AX125, 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 SI63AX125
The AirTAC SI63 Standard Cylinder SI63AX125 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 125mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63AX125, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke125 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63AX125
- 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 SI63AX125
The AirTAC SI63AX125 is a discontinued double-acting ISO 15552 profile cylinder with a 63mm bore and 125mm stroke. It delivers 1559N push force at 0.5MPa through a G3/8 port. The direct replacement is the SAI63AX125, which matches the exact ISO 15552 mounting interface, stroke, force, and port size for immediate fixture compatibility. This specific SKU features a SUS420J2 stainless piston rod for corrosion resistance.
Because this is a no-magnet configuration, it cannot accept position sensors. The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and long life.
Airtac SI63 Standard Cylinder SI63AX125 Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63AX125 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63AX125 |
| Bore size | Ø63 mm |
| Stroke | 125 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 SAI63AX125 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 SAI63AX125 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 SI63AX125
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×125 | 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 SI63AX125 Is Used
Stainless Rod Actuation
Leverages the SUS420J2 rod for mid-force clamping and positioning in environments where moisture or minor corrosion is a concern.
Material Diversion
Provides robust 1559N push force at 0.5MPa to reliably pivot diverters or sort packages on continuous manufacturing lines.
Replacing the Airtac SI63 Standard Cylinder SI63AX125 with the SAI63AX125
To replace the SI63AX125, order the SAI63AX125. Verify the ISO 15552 mounting interface, the 63mm bore, 125mm stroke, G3/8 port, and the SUS420J2 rod option. Since this SKU lacks a magnet, it cannot support switches; if sensing is needed, specify an SAI with the S magnet suffix. For sizing alternatives, a 50mm bore yields 982N push at 0.5MPa, while an 80mm bore provides 2513N. Note that a plain cylinder drifts on air loss; the cushion only decelerates. For load holding, use an external pilot check valve or the SAIL/BSAI lock variants. The SAI family also offers the SAIF self-valve option.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63AX125
- ✓ 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 SI63AX125 FAQ
Yes, the SI63AX125 is discontinued. The direct replacement is the AirTAC SAI63AX125. It is dimensionally interchangeable per ISO 15552, matching the 63mm bore, 125mm stroke, G3/8 port, and mounting interface, but features an upgraded two Y-shaped one-way piston seal for longer life.
This 63mm bore double-acting cylinder uses a G3/8 air port. It generates 1559N push and 1402N pull at 0.5MPa, 2182N push at 0.7MPa, 2805N push at 0.9MPa, and a maximum theoretical force of 318kgf at 1.0MPa. The rod is 20mm with an M16x1.5 thread.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63AX125
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63AX125 replacement — usually within 7-8 hours.