This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50BX330S, 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 SI50BX330S
The AirTAC Airtac SI50 Standard Cylinder SI50BX330S 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 SAI50BX330S, 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 → SAI50BX330S
- 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 SI50BX330S
The AirTAC SI50BX330S is a discontinued double-acting ISO 15552 profile cylinder featuring a SUS304 stainless piston rod (B option) and a 330mm stroke. Delivering 982N push force at 0.5MPa, it is replaced by the SAI50BX330S. This direct successor shares the exact bore, port (G1/4), and mounting interface, fitting existing fixtures perfectly.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and extended life. The -S magnet works with legacy CS1-B/DS1-B sensors, while the SAI family adds SAIL lock, SAIF valve, and BSAI clamp variants absent in the SI line.
Airtac SI50 Standard Cylinder SI50BX330S Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50BX330S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50BX330S |
| 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 SAI50BX330S 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 SAI50BX330S 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 SI50BX330S
| 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 SI50BX330S Is Used
Stainless Rod Diverters
Ideal for pushing packages on packaging lines where the SUS304 rod resists moisture and corrosion.
Long-Stroke Material Handling
Suited for 330mm extraction or transfer tasks, provided external guides minimize rod side-load.
Replacing the Airtac SI50 Standard Cylinder SI50BX330S with the SAI50BX330S
To replace the SI50BX330S, order the SAI50BX330S, confirming the ISO 15552 interface, 50mm bore, 330mm stroke, G1/4 port, and mounting accessory. The -S magnet enables current AirTAC switches (replacing legacy CS1-B/DS1-B). For sizing, neighboring bores offer 628N (40mm) or 1559N (63mm) push at 0.5MPa. Note that a plain cylinder drifts on air loss; the cushion only decelerates. For load holding, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant. Because 330mm exceeds 300mm, add external guides to prevent rod bending under side loads.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50BX330S
- ✓ 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 SI50BX330S FAQ
Yes, the SI50BX330S is discontinued. The direct replacement is the SAI50BX330S. It shares the same ISO 15552 mounting interface, 50mm bore, 330mm stroke, output force, and G1/4 port, fitting existing fixtures directly.
The 50mm bore features a G1/4 air port and provides 982N push / 825N pull at 0.5MPa, 1374N push at 0.7MPa, and a theoretical max of 200kgf at 1.0MPa. It uses a 20mm rod with an M16x1.5 thread.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50BX330S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50BX330S replacement — usually within 7-8 hours.