This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63X135S, 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 SI63X135S
The AirTAC Airtac SI63 Standard Cylinder SI63X135S 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 SAI63X135S, 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 → SAI63X135S
- 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 SI63X135S
The AirTAC SI63X135S is a discontinued double-acting ISO 15552 profile cylinder with a 63 mm bore and 135 mm stroke. Delivering 1559 N push force at 0.5 MPa through a G3/8 port, it is replaced by the SAI63X135S. This direct successor shares the exact interface, bore, stroke, force and mounting, fitting existing fixtures perfectly.
The SAI upgrade features two Y-shaped one-way piston seals for low start-up pressure and long life. The -S magnet works with legacy CS1-B/DS1-B sensors, while the SAI family adds SAIL, SAIF and BSAI variants the SI lacked.
Airtac SI63 Standard Cylinder SI63X135S Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63X135S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63X135S |
| 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 SAI63X135S 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 SAI63X135S 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 SI63X135S
| 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 SI63X135S Is Used
Clamp Actuation
Provides 1559 N of push force at 0.5 MPa to secure medium-duty workpieces during machining operations.
Package Diversion
Uses the 135 mm stroke to push cartons off a main conveyor belt line into secondary sorting lanes.
Pallet Stops
Acts as a robust pneumatic stop mechanism for pallets up to 79 kg moving through distribution hubs.
Replacing the Airtac SI63 Standard Cylinder SI63X135S with the SAI63X135S
To replace the SI63X135S, order the SAI63X135S. Confirm the ISO 15552 mounting interface, 63 mm bore, 135 mm stroke, G3/8 port (PT/G/NPT thread), M16x1.5 rod thread and the -S magnet for CS1-B/DS1-B switches. If sizing up or down, neighbouring bores (50 mm or 80 mm) yield 982 N or 2513 N push at 0.5 MPa. Remember a plain cylinder drifts without live air; the cushion only decelerates. For load holding, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant. Stroke is under 300 mm so rod bending is minimal, but check side loads.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63X135S
- ✓ 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 SI63X135S FAQ
Yes, the AirTAC SI63X135S is discontinued. The direct replacement is the SAI63X135S. It is dimensionally interchangeable per ISO 15552, retaining the same 63 mm bore, 135 mm stroke, output force, G3/8 port and mounting accessories.
The 63 mm bore features a G3/8 air port and an M16x1.5 rod thread. Force output is 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 maximum of 318 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63X135S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63X135S replacement — usually within 7-8 hours.