This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63X85S, 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 SI63X85S
The AirTAC Airtac SI63 Standard Cylinder SI63X85S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 85mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63X85S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke85 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63X85S
- 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 SI63X85S
The AirTAC SI63X85S is a discontinued double-acting ISO 15552 profile cylinder with an extruded aluminum barrel, delivering 1559 N push and 1402 N pull at 0.5 MPa. It features a 63 mm bore, 85 mm stroke, and a G3/8 port. AirTAC replaced this legacy unit with the SAI63X85S, a direct replacement retaining the exact ISO 15552 mounting interface, output force, and port size.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and extended life. The SAI family also adds SAIL, SAIF, and BSAI lock variants the SI lacked. This -S model carries a piston magnet for CS1-B/DS1-B sensors, while the SAI uses current AirTAC switches.
Airtac SI63 Standard Cylinder SI63X85S Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63X85S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63X85S |
| Bore size | Ø63 mm |
| Stroke | 85 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 SAI63X85S 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 SAI63X85S 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 SI63X85S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×85 | 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 SI63X85S Is Used
Mid-Tonnage Clamping
Secures heavy workpieces in machining fixtures using its 1559 N push force at 0.5 MPa, ensuring rigid holding during milling or drilling operations.
Package Diversion
Actuates routing gates and pushers on automated packaging lines, where the 85 mm stroke provides fast, precise lateral movement of goods.
Pallet Stops
Functions as a robust pneumatic stop in conveyor endpoints, using its 1402 N pull force to reliably arrest incoming pallet loads.
Replacing the Airtac SI63 Standard Cylinder SI63X85S with the SAI63X85S
To replace the SI63X85S, order the SAI63X85S, confirming the ISO 15552 interface, 63 mm bore, 85 mm stroke, G3/8 port, and mounting accessory. The -S suffix means a magnet is present for CS1-B/DS1-B switches; a no-S SKU cannot take a sensor. For sizing both ways: a 50 mm bore yields 982 N push, while an 80 mm bore yields 2513 N at 0.5 MPa. A plain cylinder does not hold load on air loss—the cushion only decelerates—so use the SAIL or BSAI lock variant, or an external pilot check valve for suspended loads.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63X85S
- ✓ 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 SI63X85S FAQ
Yes, the AirTAC SI63X85S is discontinued. The direct replacement is the SAI63X85S. It shares the identical ISO 15552 mounting interface, 63 mm bore, 85 mm stroke, output force, and G3/8 port, fitting existing fixtures perfectly.
The 63 mm bore cylinder delivers 1559 N push and 1402 N pull at 0.5 MPa, 2182 N push at 0.7 MPa, 2805 N at 0.9 MPa, and a theoretical max of 318 kgf at 1.0 MPa. Operating speed is 30-800 mm/s, with a 30 mm adjustable air cushion at each end.
Request a Quote for the SAI63X85S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63X85S replacement — usually within 7-8 hours.