This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63AX90S, 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 SI63AX90S
The AirTAC SI63 Standard Cylinder SI63AX90S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 90mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63AX90S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke90 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63AX90S
- 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 SI63AX90S
The AirTAC SI63AX90S is a discontinued double-acting ISO 15552 profile cylinder with a 63 mm bore and 90 mm stroke. Delivering 1559 N push force at 0.5 MPa, it features a G3/8 port, an M16x1.5 rod thread, and an SUS420J2 stainless steel rod (-A). The built-in magnet (-S) supports CS1-B/DS1-B sensors. AirTAC replaced this legacy unit with the SAI63AX90S.
The SAI63AX90S is a direct replacement matching the ISO 15552 mounting interface, bore, stroke, and output force. It upgrades the piston seal to two Y-shaped one-way elements for lower start-up pressure and longer life. Note that a plain cylinder drifts on air loss; use a pilot check valve or SAIL lock variant for load holding.
Airtac SI63 Standard Cylinder SI63AX90S Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63AX90S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63AX90S |
| Bore size | Ø63 mm |
| Stroke | 90 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 SAI63AX90S 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 SAI63AX90S 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 SI63AX90S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×90 | 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 SI63AX90S Is Used
Mid-Tonnage Pressing
Applies 1559 N of push force at 0.5 MPa for seating bearings, stamping light tags, or clinching sheet metal enclosures.
Package Diverting
Drives 90 mm stroke diverters or pop-up gates on material handling lines, cycling safely within the 30-800 mm/s speed range.
Pallet Stops
Acts as a robust pneumatic stop for medium-weight pallets, using the SUS420J2 stainless rod to resist moisture and impact.
Replacing the Airtac SI63 Standard Cylinder SI63AX90S with the SAI63AX90S
To replace the discontinued SI63AX90S, order the SAI63AX90S. It drops into the exact same ISO 15552 fixtures with identical 63 mm bore, 90 mm stroke, G3/8 port, and mounting accessories. Retain the -S magnet for current AirTAC switches and the -A SUS420J2 rod if corrosion resistance is needed. If you need more force, the 80 mm bore yields 2513 N push at 0.5 MPa; if less is acceptable, the 50 mm bore provides 982 N. Remember that a standard cylinder does not hold load without live air—the cushion only decelerates. For secure holding, consider an external rod lock, a pilot check valve, or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63AX90S
- ✓ 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 SI63AX90S FAQ
Yes, the AirTAC SI63AX90S is discontinued. The direct replacement is the SAI63AX90S. It shares the same ISO 15552 mounting interface, 63 mm bore, 90 mm stroke, output force, and G3/8 port, but features an upgraded two Y-shaped element piston seal for longer life.
This 63 mm bore cylinder has a G3/8 air port. It delivers 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 force of 318 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63AX90S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63AX90S replacement — usually within 7-8 hours.