This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63X850, 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 SI63X850
The AirTAC Airtac SI63 Standard Cylinder SI63X850 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 850mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63X850, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke850 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63X850
- 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 SI63X850
The AirTAC SI63X850 is a discontinued double-acting ISO 15552 profile cylinder with an 850 mm stroke and a 63 mm bore, delivering 1559 N push force at 0.5 MPa through a G3/8 port. As an end-of-life unit, it is replaced by the SAI63X850. This direct successor matches the exact ISO 15552 mounting interface, bore, stroke, output force, and port size, fitting existing fixtures perfectly.
The SAI upgrade features a modernized piston seal with two Y-shaped one-way elements for low start-up pressure and extended life. Note that this specific SI SKU lacks a magnet and cannot accept a sensor. If you need load holding on air loss, the plain SAI drifts, so consider the SAIL or BSAI lock variants.
Airtac SI63 Standard Cylinder SI63X850 Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63X850 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63X850 |
| Bore size | Ø63 mm |
| Stroke | 850 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 SAI63X850 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 SAI63X850 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 SI63X850
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×850 | 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 SI63X850 Is Used
Long-Stroke Diversion
Pushes packages across a 850 mm transfer gap with 1559 N of force at 0.5 MPa, requiring external guides to prevent rod bending over the long travel.
Material Ejection
Ejects molded parts from a press over an extended 850 mm distance, relying on the 30 mm adjustable air cushions to decelerate the 20 mm rod smoothly.
Replacing the Airtac SI63 Standard Cylinder SI63X850 with the SAI63X850
To replace the discontinued SI63X850, order the SAI63X850. Verify your ISO 15552 mounting interface (LB, FA, TC, etc.), the G3/8 port thread (PT, G, or NPT), and the M16x1.5 rod-end thread. Because this SKU has no -S magnet, it cannot support legacy CS1-B/DS1-B sensors; order a magnet-equipped SAI if position detection is needed. Sizing both ways: a 63 mm bore yields 1559 N push at 0.5 MPa, while an 80 mm bore provides 2513 N. For load holding without live air, use an external pilot check valve or the SAIL/BSAI lock variants, as cushions only decelerate. With an 850 mm stroke, prevent rod bending by guiding the load externally to avoid side-loading.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63X850
- ✓ 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 SI63X850 FAQ
Yes, the SI63X850 is discontinued. The direct replacement is the SAI63X850. It shares the identical ISO 15552 mounting interface, 63 mm bore, 850 mm stroke, output force, G3/8 port, and accessories, so it drops directly into existing fixtures.
The 63 mm bore features a G3/8 air port and a 20 mm rod. 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 of 318 kgf at 1.0 MPa.
Request a Quote for the SAI63X850
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63X850 replacement — usually within 7-8 hours.