This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63AX35S, 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 SI63AX35S
The AirTAC Airtac SI63 Standard Cylinder SI63AX35S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 35mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63AX35S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke35 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63AX35S
- 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 SI63AX35S
The AirTAC SI63AX35S is a discontinued double-acting ISO 15552 profile cylinder with a 63mm bore and 35mm stroke. Delivering 1559N push force at 0.5MPa through a G3/8 port, it is replaced by the SAI63AX35S. This direct successor shares the exact ISO 15552 mounting interface, bore, stroke, force and port, fitting existing fixtures perfectly.
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 includes a -S magnet for legacy CS1-B/DS1-B sensors and an -A SUS420J2 stainless rod for corrosion resistance.
Airtac SI63 Standard Cylinder SI63AX35S Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63AX35S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63AX35S |
| Bore size | Ø63 mm |
| Stroke | 35 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 SAI63AX35S 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 SAI63AX35S 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 SI63AX35S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×35 | 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 SI63AX35S Is Used
Short-Stroke Clamping
Ideal for holding heavy machined parts during milling, using the 1559N push force to secure components firmly against locators.
Package Diverting
Provides a fast 35mm actuation to push cartons off a main conveyor belt line into secondary packaging lanes.
Press Ejection
Delivers a rapid 30-800mm/s stroke to eject formed metal parts from a press bed before the next cycle begins.
Replacing the Airtac SI63 Standard Cylinder SI63AX35S with the SAI63AX35S
To replace the SI63AX35S, order the SAI63AX35S. Verify the ISO 15552 mounting interface, 63mm bore, 35mm stroke, G3/8 port (PT/G/NPT thread), M16x1.5 rod thread, and the -S magnet for current AirTAC switches. The -A rod denotes SUS420J2 stainless steel; default is carbon steel. Sizing both ways: a 50mm bore yields 982N push @0.5MPa, while an 80mm bore yields 2513N. If dropping to 0.5MPa is required, the 63mm bore still provides 1559N. A plain cylinder drifts on air loss as the cushion only decelerates; for load holding, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variants. The SAIF variant integrates a 4M valve for bores 32-100.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63AX35S
- ✓ 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 SI63AX35S FAQ
Yes, the SI63AX35S is discontinued. The direct replacement is the SAI63AX35S. It is dimensionally interchangeable per ISO 15552, retaining the same 63mm bore, 35mm stroke, output force, G3/8 port and mounting accessories.
The 63mm bore features a G3/8 air port and M16x1.5 rod thread. Force output is 1559N push and 1402N pull at 0.5MPa, 2182N push at 0.7MPa, 2805N push at 0.9MPa, with a theoretical max of 318kgf at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63AX35S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63AX35S replacement — usually within 7-8 hours.