This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63AX850, 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 SI63AX850
The AirTAC SI63 Standard Cylinder SI63AX850 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 SAI63AX850, 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 → SAI63AX850
- 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 SI63AX850
The AirTAC SI63AX850 is a discontinued double-acting ISO 15552 profile cylinder with an extruded aluminum barrel, delivering 1559 N push force at 0.5 MPa. It features a 63 mm bore, 850 mm stroke, and a G3/8 air port. The direct replacement is the SAI63AX850, which matches the original ISO 15552 mounting interface, bore, stroke, output force, port size, and accessories.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and long life. This SI63AX850 variant uses a SUS420J2 stainless steel rod (option A) for corrosion resistance, but lacks a magnet, so it cannot accept position switches. For load holding, note that a plain cylinder drifts on air loss—the cushion only decelerates—so use a pilot check valve or the SAIL lock variant.
Airtac SI63 Standard Cylinder SI63AX850 Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63AX850 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63AX850 |
| 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 SAI63AX850 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 SAI63AX850 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 SI63AX850
| 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 SI63AX850 Is Used
Long-Stroke Diversion
Actuates large diverters on material handling lines over an 850 mm span, relying on the 1559 N push force to pivot heavy product guides.
Pallet Push-Off
Pushes palletized goods onto adjacent accumulation rollers, utilizing the SUS420J2 stainless rod to resist humidity in distribution centers.
Replacing the Airtac SI63 Standard Cylinder SI63AX850 with the SAI63AX850
To replace the SI63AX850, order the SAI63AX850. Verify the ISO 15552 mounting interface, 63 mm bore, 850 mm stroke, G3/8 port, and your specific mounting accessory. Because this SKU has no -S magnet, it cannot support legacy CS1-B/DS1-B sensors; order a magnet-equipped SAI if sensing is required. At 0.5 MPa, the 63 mm bore yields 1559 N push and 1402 N pull; if undersizing, a 50 mm bore gives 982 N push, and if oversizing, an 80 mm bore provides 2513 N. For this 850 mm stroke, external guides are strongly recommended to prevent rod bending and side-load damage. A plain cylinder does not hold load without live air; for secure holding, consider the SAIL air-released lock or BSAI clamp-lock variants, or an external rod lock.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63AX850
- ✓ 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 SI63AX850 FAQ
Yes, the SI63AX850 is discontinued. The direct replacement is the SAI63AX850. It is dimensionally interchangeable per ISO 15552, matching the 63 mm bore, 850 mm stroke, 1559 N force, G3/8 port, and mounting interface.
This double-acting cylinder has a G3/8 air port. 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.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63AX850
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63AX850 replacement — usually within 7-8 hours.