This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63X50, 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 SI63X50
The AirTAC Airtac SI63 Standard Cylinder SI63X50 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 SAI63X50, 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 → SAI63X50
- 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 SI63X50
The AirTAC SI63X50 is a discontinued double-acting ISO 15552 profile cylinder with a 63 mm bore and 50 mm stroke. Delivering 1559 N push force at 0.5 MPa through a G3/8 port, it is replaced by the SAI63X50 direct upgrade. This successor maintains the exact ISO 15552 mounting interface, bore, stroke, output force, and port size for existing fixtures.
The SAI upgrade features a refined piston seal with two Y-shaped one-way elements for low start-up pressure and extended life. Note this non-magnet SKU cannot accept a sensor, and the family now includes SAIL lock, SAIF valve, and BSAI clamp-lock variants.
Airtac SI63 Standard Cylinder SI63X50 Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63X50 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63X50 |
| 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 SAI63X50 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 SAI63X50 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 SI63X50
| 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 SI63X50 Is Used
Clamp Actuation
Provides 1559 N of push force at 0.5 MPa to secure heavy workpieces in machining fixtures.
Package Diverting
Drives a 50 mm stroke diverter arm to route medium-weight goods across handling lines.
Pallet Stopping
Acts as a robust pneumatic stop gate for pallets accumulating on roller conveyors.
Replacing the Airtac SI63 Standard Cylinder SI63X50 with the SAI63X50
To replace the SI63X50, order the SAI63X50. Verify your ISO 15552 mounting accessory (LB foot, FA flange, TC trunnion), G3/8 port thread (PT/G/NPT), and M16x1.5 rod end. This non-magnet version cannot hold a position switch; order an SAI63X50S if sensing is required. For sizing, the 50 mm bore yields 982 N push at 0.5 MPa, while the 80 mm bore yields 2513 N. A plain cylinder drifts on air loss—the cushion only decelerates—so use a SAIL lock variant or external pilot check valve for load holding. The 30 mm cushion stroke ensures smooth end-of-travel stopping.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63X50
- ✓ 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 SI63X50 FAQ
Yes, the AirTAC SI63X50 is discontinued. The direct replacement is the SAI63X50. It is a true ISO 15552 profile cylinder that matches the 63 mm bore, 50 mm stroke, G3/8 port, and mounting interface, dropping directly into existing fixtures.
The G3/8 port feeds a 20 mm rod. Force output is 1559 N push and 1402 N pull at 0.5 MPa, 2182 N push at 0.7 MPa, and 2805 N push at 0.9 MPa. The theoretical maximum is 318 kgf at 1.0 MPa. Operating speed is 30-800 mm/s.
Request a Quote for the SAI63X50
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63X50 replacement — usually within 7-8 hours.