This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50BX190, 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 SI50BX190
The AirTAC Airtac SI50 Standard Cylinder SI50BX190 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 190mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50BX190, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke190 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50BX190
- 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 SI50BX190
The AirTAC SI50BX190 is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 190mm stroke. Delivering 982N push and 825N pull at 0.5MPa through a G1/4 port, it is directly replaced by the SAI50BX190. This direct upgrade shares the exact ISO 15552 mounting interface, bore, stroke, force, port and accessories, fitting existing fixtures perfectly.
The SAI replacement features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life. This specific SKU has a SUS304 stainless steel rod (-B) but lacks a magnet, meaning it cannot accept CS1-B/DS1-B sensors.
Airtac SI50 Standard Cylinder SI50BX190 Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50BX190 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50BX190 |
| Bore size | Ø50 mm |
| Stroke | 190 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 SAI50BX190 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 SAI50BX190 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 SI50BX190
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×190 | 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 SI50BX190 Is Used
Diverting Gate Actuation
Drives routing flaps on packaging lines, using the 825N pull force at 0.5MPa to reliably shift product flow between parallel belts.
Stainless Rod Clamping
Actuates light-duty clamps in humid wash-down zones, leveraging the SUS304 rod option to resist corrosion while securing parts.
Replacing the Airtac SI50 Standard Cylinder SI50BX190 with the SAI50BX190
To replace the SI50BX190, order the SAI50BX190 with the exact 50mm bore, 190mm stroke, G1/4 port, and SUS304 rod. Confirm your ISO 15552 mounting accessory (LB, FA, TC, etc.) matches. Because this SKU has no magnet (-S), it cannot take a magnetic switch; if sensing is needed, switch to an SAI50X190S. For sizing alternatives, a 40mm bore yields 628N push at 0.5MPa, while a 63mm bore offers 1559N. Note that a plain cylinder does not hold load without live air—the cushion only decelerates. For load holding, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variants. At 190mm stroke, rod bending is minimal, but always guide the load to prevent side-load wear.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50BX190
- ✓ 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 SI50BX190 FAQ
Yes, the AirTAC SI50BX190 is discontinued. The direct replacement is the SAI50BX190. It is dimensionally interchangeable per ISO 15552, retaining the same 50mm bore, 190mm stroke, 982N force, G1/4 port, and mounting interface.
This double-acting cylinder features a G1/4 air port and an M16x1.5 rod thread. The thrust ratings are: 982N push and 825N pull at 0.5MPa, 1374N push at 0.7MPa, 1767N push at 0.9MPa, and a theoretical maximum force of 200kgf at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50BX190
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50BX190 replacement — usually within 7-8 hours.