This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X63S, 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 SI50 Standard Cylinder SI50X63S
The AirTAC Airtac SI50 Standard Cylinder SI50X63S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 63mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X63S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke63 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X63S
- 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 SI50 Standard Cylinder SI50X63S
The AirTAC SI50X63S is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 63mm stroke. Delivering 982 N push force at 0.5 MPa, it features a Ø20mm rod, M16x1.5 thread, G1/4 port, and 30mm adjustable cushions. The direct replacement is the SAI50X63S, matching the interface, force, and mounting.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and long life. The SAI family also adds SAIL, SAIF, and BSAI lock variants. This -S SKU uses CS1-B/DS1-B sensors, while the SAI takes current AirTAC switches.
Airtac SI50 Standard Cylinder SI50X63S Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X63S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X63S |
| Bore size | Ø50 mm |
| Stroke | 63 mm |
| Acting type | Double acting |
| Port size | G1/4 |
| 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 1200 mm |
Specifications follow the official AirTAC SI datasheet (now discontinued). The SAI50X63S carries the same ISO 15552 ratings. Confirm against the product label before installation. Thread options: PT / G / NPT.
Theoretical Output Force (Ø50mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 982 N | 825 N |
| 0.7 MPa | 1374 N | — |
| Max (@1.0 MPa) | 200 kgf | |
The SAI50X63S produces the same force from the same bore. Actual usable force is lower than theoretical; size with a margin.
Model Code: Airtac SI50 Standard Cylinder SI50X63S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×63 | 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 SI50 Standard Cylinder SI50X63S Is Used
Mid-Force Clamping
Secures steel workpieces on machining fixtures using 982 N of thrust at 0.5 MPa.
Pallet Stops
Controls pallet flow on rollers, safely halting materials with 30mm adjustable cushions.
Replacing the Airtac SI50 Standard Cylinder SI50X63S with the SAI50X63S
To replace the SI50X63S, order the SAI50X63S. Verify the ISO 15552 mounting interface, 50mm bore, 63mm stroke, G1/4 port (PT/G/NPT), and the -S magnet. If you need more force, the 63mm bore yields 1559 N push at 0.5 MPa; if less is required, the 40mm bore gives 628 N. Note that 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 variant. Rod material options include carbon steel, SUS420J2 (A), or SUS304 (B).
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X63S
- ✓ Same bore / stroke / force
- ✓ Port/thread type (PT/G/NPT)
- ✓ Magnet (-S) for sensors?
- ✓ Mounting reused (FA/FB/CA/CB/CR/LB/TC)
Airtac SI50 Standard Cylinder SI50X63S FAQ
Yes, the SI50X63S is discontinued. The direct replacement is the SAI50X63S. It shares the same ISO 15552 mounting interface, 50mm bore, 63mm stroke, G1/4 port, and output force, fitting existing fixtures perfectly.
The 50mm bore has a G1/4 port. It delivers 982 N push and 825 N pull at 0.5 MPa, 1374 N push at 0.7 MPa, and a theoretical maximum of 200 kgf at 1.0 MPa. Operating speed is 30-800 mm/s.
Request a Quote for the SAI50X63S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X63S replacement — usually within 7-8 hours.