This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63AX135S, 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 SI63AX135S
The AirTAC Airtac SI63 Standard Cylinder SI63AX135S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 135mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63AX135S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke135 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63AX135S
- 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 SI63AX135S
The AirTAC SI63AX135S is a discontinued double-acting ISO 15552 profile cylinder with a 63mm bore and 135mm stroke. It delivers 1559N push force at 0.5MPa via a G3/8 port. The direct replacement is the SAI63AX135S, matching the interface, bore, stroke, force, and mounting. The SAI features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life. This specific unit includes the -A SUS420J2 stainless piston rod for corrosion resistance and the -S magnet for legacy CS1-B/DS1-B sensors.
The SAI family also introduces variants the SI lacked, such as the SAIL air-released lock, SAIF built-in valve, and BSAI clamp-lock. If you need to hold a load without live air, note that a plain cylinder drifts; the cushion only decelerates. You would need the SAIL/BSAI variant or an external pilot check valve.
Airtac SI63 Standard Cylinder SI63AX135S Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63AX135S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63AX135S |
| Bore size | Ø63 mm |
| Stroke | 135 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 SAI63AX135S 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 SAI63AX135S 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 SI63AX135S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×135 | 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 SI63AX135S Is Used
Stainless Rod Clamping
Ideal for packaging machines where the SUS420J2 rod resists washdown moisture while providing 1559N of clamping thrust.
Material Diversion
Actuates diverters on medium-duty conveyors, using the 135mm stroke to push products cleanly into sorting lanes.
Replacing the Airtac SI63 Standard Cylinder SI63AX135S with the SAI63AX135S
To replace the SI63AX135S, order the SAI63AX135S. Confirm the ISO 15552 mounting interface, the 135mm stroke, the G3/8 port, and your mounting accessory (LB, FA, TC, etc.). This unit has the -S magnet (for CS1-B/DS1-B switches) and the -A SUS420J2 stainless rod; specify these on the SAI order. Sizing both ways: a 50mm bore gives 982N push at 0.5MPa, while an 80mm bore gives 2513N. For load holding, a standard cylinder drifts on air loss—the cushion only decelerates—so use an external rod lock, a pilot check valve, or the SAIL/BSAI lock variant. Since the 135mm stroke is under 300mm, rod bending is minimal, but always guide external loads to prevent side-load wear.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63AX135S
- ✓ 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 SI63AX135S FAQ
Yes, the SI63AX135S is discontinued. The direct replacement is the SAI63AX135S. It is dimensionally interchangeable per ISO 15552, retaining the same 63mm bore, 135mm stroke, output force, G3/8 port, and mounting interface.
The bore is 63mm with a G3/8 air port. Force output is 1559N push and 1402N pull at 0.5MPa, 2182N push at 0.7MPa, 2805N push at 0.9MPa, and a theoretical maximum of 318kgf at 1.0MPa. Operating speed is 30-800mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63AX135S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63AX135S replacement — usually within 7-8 hours.