This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X330S, 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 SI50X330S
The AirTAC Airtac SI50 Standard Cylinder SI50X330S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 330mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X330S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke330 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X330S
- 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 SI50X330S
The AirTAC SI50X330S is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 330mm stroke. Delivering 982 N push force at 0.5 MPa through a G1/4 port, it is replaced by the SAI50X330S. This direct successor matches the exact ISO 15552 mounting interface, bore, stroke, force, and accessories.
The SAI upgrade features 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 the SI lacked. Your -S magnet works with legacy CS1-B/DS1-B sensors, though SAI uses current AirTAC switches.
Airtac SI50 Standard Cylinder SI50X330S Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X330S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X330S |
| Bore size | Ø50 mm |
| Stroke | 330 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 SAI50X330S 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 SAI50X330S 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 SI50X330S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×330 | 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 SI50X330S Is Used
Material Diversion
Actuates routing gates on packaging lines, utilizing the 982 N push force to reliably shift heavy product flows at speed.
Pallet Handling
Drives lifting mechanisms on end-of-line conveyors, where the 330mm stroke accommodates varying pallet heights.
Replacing the Airtac SI50 Standard Cylinder SI50X330S with the SAI50X330S
To replace the SI50X330S, order the SAI50X330S. Confirm the ISO 15552 interface, 50mm bore, 330mm stroke, G1/4 port (PT/G/NPT), and mounting accessory. The -S magnet enables CS1-B/DS1-B sensors. If sizing up, the 63mm bore yields 1559 N push at 0.5 MPa; sizing down, the 40mm bore yields 628 N. At 330mm, use external guides to prevent rod bending and side-load wear. 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 → SAI50X330S
- ✓ 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 SI50X330S FAQ
Yes, the SI50X330S is discontinued. The direct replacement is the SAI50X330S. It is dimensionally interchangeable per ISO 15552, matching the 50mm bore, 330mm stroke, 982 N force, G1/4 port, and mounting fixtures.
This 50mm bore double-acting cylinder features a G1/4 air port and a 20mm rod. It delivers 982 N push and 825 N pull at 0.5 MPa, 1374 N push at 0.7 MPa, and a theoretical maximum force of 200 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50X330S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X330S replacement — usually within 7-8 hours.