This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63AX135, 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 SI63AX135
The AirTAC Airtac SI63 Standard Cylinder SI63AX135 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 SAI63AX135, 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 → SAI63AX135
- 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 SI63AX135
The AirTAC SI63AX135 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 SAI63AX135, which shares identical ISO 15552 mounting dimensions, stroke, and force. The SAI upgrade features a new piston seal with two Y-shaped one-way elements for low start-up pressure and long life. This specific SKU uses an SUS420J2 stainless steel rod (-A) and lacks a magnet, so it cannot accept position sensors.
Note that a standard cylinder drifts without live air; the cushion only decelerates at stroke end. For load holding, consider an external pilot check valve or the SAIL/BSAI lock variants.
Airtac SI63 Standard Cylinder SI63AX135 Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63AX135 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63AX135 |
| 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 SAI63AX135 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 SAI63AX135 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 SI63AX135
| 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 SI63AX135 Is Used
Clamping Fixtures
Applies up to 2805N of clamping thrust at 0.7MPa to hold heavy metal castings securely during CNC machining operations.
Package Diverters
Drives diverter arms along packaging lines, moving moderate loads with a 135mm stroke and 30-800mm/s speed range.
Pallet Stops
Acts as a robust pneumatic stop for heavy pallets, utilizing the SUS420J2 stainless rod to resist corrosion in humid logistics hubs.
Replacing the Airtac SI63 Standard Cylinder SI63AX135 with the SAI63AX135
To replace the SI63AX135, order the SAI63AX135. It drops directly into existing ISO 15552 fixtures with the same 63mm bore, 135mm stroke, G3/8 port, M16x1.5 rod thread, and SUS420J2 rod. Because this SKU lacks a magnet (-S), it cannot support legacy CS1-B/DS1-B sensors; if sensing is needed, select an SAI model with the S suffix. If downsizing, a 50mm bore yields 982N push at 0.5MPa; if upsizing, an 80mm bore provides 2513N. Remember that air cushions only decelerate the load—they do not hold it. For secure load holding on air loss, use an external rod lock or pilot check valve, or specify the SAIL or BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63AX135
- ✓ 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 SI63AX135 FAQ
Yes, the SI63AX135 is discontinued. The direct replacement is the AirTAC SAI63AX135. It shares the exact same ISO 15552 mounting interface, 63mm bore, 135mm stroke, output force, G3/8 port, and SUS420J2 stainless rod, fitting existing fixtures perfectly.
This 63mm bore cylinder features a G3/8 air port and M16x1.5 rod thread. It delivers 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.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63AX135
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63AX135 replacement — usually within 7-8 hours.