This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63X850SLB, 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 SI63X850SLB
The AirTAC Airtac SI63 Standard Cylinder SI63X850SLB 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 SAI63X850SLB, 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 → SAI63X850SLB
- 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 SI63X850SLB
The AirTAC SI63X850SLB is a discontinued double-acting ISO 15552 profile cylinder with an 850 mm stroke, delivering 1559 N push force at 0.5 MPa through its G3/8 port. AirTAC replaced this legacy unit with the SAI63X850SLB. This current-production direct maintains the exact same ISO 15552 mounting interface, bore, stroke, output force, and port size, fitting directly into your existing LB foot-mount fixtures.
The SAI upgrade introduces a refined piston seal featuring two Y-shaped one-way elements for low start-up pressure and extended life. The original SI unit relied on a CS1-B/DS1-B sensor set via its -S magnet, while the SAI family also adds SAIL, SAIF, and BSAI lock variants absent from the SI line.
Airtac SI63 Standard Cylinder SI63X850SLB Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63X850SLB |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63X850SLB |
| 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 SAI63X850SLB 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 SAI63X850SLB 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 SI63X850SLB
| 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 SI63X850SLB Is Used
Long-Stroke Material Transfer
Drives heavy pallets across extended conveyor sections where the 1559 N push force and 850 mm travel distance are required for automated routing.
Vertical Lift Gates
Elevates access doors or lifting platforms up to 79 kg, utilizing the LB foot mount to secure the ISO 15552 body to rigid structural frames.
Large Fixture Actuation
Actuates oversized clamping fixtures or welding hoods, relying on the 30 mm adjustable air cushions to decelerate the payload smoothly at stroke ends.
Replacing the Airtac SI63 Standard Cylinder SI63X850SLB with the SAI63X850SLB
To replace the SI63X850SLB, order the SAI63X850SLB. Verify your ISO 15552 interface, 63 mm bore, 850 mm stroke, G3/8 port, LB foot mounting, and -S magnet for current AirTAC switches. When sizing, a 50 mm bore yields 982 N push at 0.5 MPa, while an 80 mm bore provides 2513 N. Because this is an 850 mm stroke, external guides are strongly recommended to prevent rod bending and excessive side loads. A plain cylinder drifts on air loss; for load holding, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63X850SLB
- ✓ 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 SI63X850SLB FAQ
Yes, the SI63X850SLB is discontinued. The direct replacement is the SAI63X850SLB. It is dimensionally interchangeable per ISO 15552, retaining the same 63 mm bore, 850 mm stroke, output force, G3/8 port, and LB mounting interface.
This 63 mm bore double-acting cylinder features a G3/8 air port and provides 1559 N push / 1402 N pull at 0.5 MPa, 2182 N push at 0.7 MPa, 2805 N push at 0.9 MPa, and a maximum theoretical force of 318 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63X850SLB
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63X850SLB replacement — usually within 7-8 hours.