This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63X50STC, 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 SI63X50STC
The AirTAC Airtac SI63 Standard Cylinder SI63X50STC is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 50mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63X50STC, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke50 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63X50STC
- 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 SI63X50STC
The AirTAC SI63X50STC is a discontinued double-acting ISO 15552 profile cylinder with a 63mm bore and 50mm stroke. It delivers 1559N push force at 0.5MPa via a G3/8 port. The direct replacement is the SAI63X50STC, matching the TC trunnion mount, M16x1.5 rod, and output force perfectly.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. It also adds SAIL, SAIF, and BSAI lock variants the SI lacked. The -S magnet works with legacy CS1-B/DS1-B sensors, while SAI uses current AirTAC switches.
Airtac SI63 Standard Cylinder SI63X50STC Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63X50STC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63X50STC |
| Bore size | Ø63 mm |
| Stroke | 50 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 SAI63X50STC 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 SAI63X50STC 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 SI63X50STC
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×50 | 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 SI63X50STC Is Used
Clamp Actuation
Provides 1559N of clamping force at 0.5MPa for securing mid-weight workpieces during machining operations.
Package Diverting
Short 50mm stroke quickly extends diverters or gates to route goods on production line conveyors.
Pallet Stops
Deploys a physical stop block to halt pallets at 63mm bore force within automated handling zones.
Replacing the Airtac SI63 Standard Cylinder SI63X50STC with the SAI63X50STC
To replace the SI63X50STC, order the SAI63X50STC. Verify the ISO 15552 TC trunnion mounting interface, 63mm bore, 50mm stroke, G3/8 port (PT/G/NPT thread options), and the -S magnet. If you need more force, the 80mm bore yields 2513N push at 0.5MPa; if less is acceptable, the 50mm bore provides 982N. Note that a plain cylinder drifts on air loss—the cushion only decelerates—so use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant for held loads. The 63mm bore operates at 30-800 mm/s.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63X50STC
- ✓ 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 SI63X50STC FAQ
Yes, the AirTAC SI63X50STC is discontinued. The direct replacement is the SAI63X50STC. It is dimensionally interchangeable per ISO 15552, keeping the same 63mm bore, 50mm stroke, TC trunnion mount, G3/8 port, and output force.
The 63mm bore uses a G3/8 air port. Force output is 1559N push and 1402N pull at 0.5MPa, 2182N push at 0.7MPa, 2805N push at 0.9MPa, and a theoretical max of 318kgf at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63X50STC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63X50STC replacement — usually within 7-8 hours.