This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63X90S, 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 SI63X90S
The AirTAC Airtac SI63 Standard Cylinder SI63X90S 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 SAI63X90S, 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 → SAI63X90S
- 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 SI63X90S
The AirTAC SI63X90S is a discontinued double-acting ISO 15552 profile cylinder with a 63 mm bore and 90 mm stroke. It delivers 1559 N push force at 0.5 MPa through a G3/8 port. AirTAC replaced this legacy unit with the SAI63X90S, a direct upgrade sharing the exact ISO 15552 mounting interface, bore, stroke, output force, and accessories.
The SAI replacement features an upgraded piston seal using two Y-shaped one-way elements for low start-up pressure and extended life. The family also introduces SAIL and BSAI lock variants the original SI lacked. This -S SKU includes a piston magnet for CS1-B/DS1-B switches.
Airtac SI63 Standard Cylinder SI63X90S Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63X90S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63X90S |
| 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 SAI63X90S 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 SAI63X90S 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 SI63X90S
| 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 SI63X90S Is Used
Mid-Tonnage Clamping
Ideal for holding heavier workpieces in CNC machining fixtures, utilizing the 1559 N push force at 0.5 MPa for rigid, deflection-free part securing.
Package Diversion
Drives robust routing gates or pop-up stops on high-throughput material handling lines, where the 90 mm stroke and 1402 N pull force easily redirect heavy goods.
Pallet Lift Stops
Acts as a reliable mechanical stop or positioning pin in automated storage systems, benefiting from the 63 mm bore's high thrust capacity and adjustable end cushions.
Replacing the Airtac SI63 Standard Cylinder SI63X90S with the SAI63X90S
To replace the discontinued SI63X90S, order the SAI63X90S. Confirm the ISO 15552 mounting accessory (LB, FA, CA, TC), the G3/8 port thread (PT/G/NPT), and the -S magnet for legacy CS1-B/DS1-B sensors. If you need more force, the neighboring 80 mm bore yields 2513 N push at 0.5 MPa; if less is required, the 50 mm bore provides 982 N. Remember that a plain cylinder drifts without live air, so for load holding consider an external pilot check valve or the SAIL/BSAI lock variants. At 90 mm stroke, side-load risks are minimal, but always ensure rigid guidance for heavy loads.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63X90S
- ✓ 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 SI63X90S FAQ
Yes, the SI63X90S is discontinued. The direct replacement is the AirTAC SAI63X90S. It shares the identical ISO 15552 mounting interface, 63 mm bore, 90 mm stroke, output force, and G3/8 port, fitting directly into existing fixtures without modification.
This 63 mm bore double-acting cylinder features a G3/8 air port and an M16x1.5 rod thread. It generates 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.
Request a Quote for the SAI63X90S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63X90S replacement — usually within 7-8 hours.