This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63X850STC, 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 SI63X850STC
The AirTAC Airtac SI63 Standard Cylinder SI63X850STC 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 SAI63X850STC, 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 → SAI63X850STC
- 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 SI63X850STC
The AirTAC SI63X850STC is a discontinued double-acting ISO 15552 profile cylinder with an 850 mm stroke, delivering a push force of 1559 N at 0.5 MPa. It is directly replaced by the SAI63X850STC. This direct upgrade maintains the exact bore, stroke, output force, G3/8 port, TC trunnion mount, and ISO 15552 interface dimensions, fitting existing fixtures seamlessly.
The SAI successor features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life. The -S suffix denotes a piston magnet for legacy CS1-B/DS1-B sensors, while the SAI family introduces lock and valve variants like SAIL and BSAI absent from the SI line.
Airtac SI63 Standard Cylinder SI63X850STC Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63X850STC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63X850STC |
| 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 SAI63X850STC 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 SAI63X850STC 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 SI63X850STC
| 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 SI63X850STC Is Used
Long-Stroke Material Transfer
Pushes workpieces between machining stations over an 850 mm distance, utilizing the 1559 N thrust at 0.5 MPa to move heavy jigs along an assembly line.
Pallet Positioning
Indexes loaded pallets via a TC trunnion mount, absorbing mid-stroke momentum while relying on external guides to prevent rod bending over the long travel.
Vertical Lift Gates
Raises and lowers access gates using the 79 kg vertical lift capacity, requiring an external pilot check valve to safely hold the load without live air.
Replacing the Airtac SI63 Standard Cylinder SI63X850STC with the SAI63X850STC
To replace the SI63X850STC, order the SAI63X850STC. Verify the ISO 15552 TC trunnion mounting, 63 mm bore, 850 mm stroke, G3/8 port, and the -S magnet for current AirTAC switches. Sizing both ways: a 50 mm bore yields 982 N push at 0.5 MPa, while an 80 mm bore provides 2513 N. Because this is a long 850 mm stroke, use an external guide to prevent rod bending and side-load damage. A plain cylinder drifts on air loss; the cushion only decelerates. For load holding, use an external pilot check valve or the SAIL/BSAI lock variants. Rod material options include carbon steel, SUS420J2, and SUS304.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63X850STC
- ✓ 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 SI63X850STC FAQ
Yes, the SI63X850STC is discontinued. The direct replacement is the SAI63X850STC. It matches the ISO 15552 mounting interface, 63 mm bore, 850 mm stroke, force, G3/8 port, and TC mount, fitting your existing fixtures perfectly.
The 63 mm bore features a G3/8 air port. It delivers a push force of 1559 N and a pull force of 1402 N at 0.5 MPa. At 0.7 MPa, the push force is 2182 N, and the theoretical maximum force is 318 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63X850STC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63X850STC replacement — usually within 7-8 hours.