This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50BX190S, 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 SI50BX190S
The AirTAC Airtac SI50 Standard Cylinder SI50BX190S 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 SAI50BX190S, 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 → SAI50BX190S
- 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 SI50BX190S
The AirTAC SI50BX190S is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 190mm stroke. It delivers 982 N push force at 0.5 MPa, features a G1/4 air port, and includes a SUS304 stainless piston rod (B option) for corrosion resistance. The built-in magnet (-S) supports legacy CS1-B/DS1-B switches.
Directly replace it with the SAI50BX190S, a direct sharing the exact ISO 15552 mounting interface, bore, stroke, and port. The SAI upgrades the piston seal to two Y-shaped one-way elements for low start-up pressure and long life.
Airtac SI50 Standard Cylinder SI50BX190S Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50BX190S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50BX190S |
| 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 SAI50BX190S 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 SAI50BX190S 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 SI50BX190S
| 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 SI50BX190S Is Used
Diverting Mechanism
Pushes packages on a line using its 982 N thrust, with the 190mm stroke providing ample travel to clear adjacent lanes.
Stainless Rod Clamping
Secures raw material in machining centers where coolant splashes, leveraging the SUS304 rod for corrosion resistance.
Replacing the Airtac SI50 Standard Cylinder SI50BX190S with the SAI50BX190S
To replace the SI50BX190S, order the SAI50BX190S. Confirm the ISO 15552 mounting interface (LB, FA, TC, etc.), the G1/4 port, and the -S magnet for current AirTAC switches. The SUS304 rod (B) handles wet environments. For higher force, the 63mm bore yields 1559 N at 0.5 MPa; for lighter loads, the 40mm bore yields 628 N. This plain cylinder will not hold a load without air; use an external pilot check valve or the SAIL/BSAI lock variant. At 190mm stroke, rod bending is minimal, but ensure adequate guidance for side loads.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50BX190S
- ✓ 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 SI50BX190S FAQ
Yes, the SI50BX190S is discontinued. The direct replacement is the SAI50BX190S. It shares the identical ISO 15552 mounting interface, 50mm bore, 190mm stroke, output force, and G1/4 port, fitting existing fixtures perfectly.
The SI50BX190S operates at 30-800 mm/s. Force ratings are: 982 N push and 825 N pull at 0.5 MPa, 1374 N push at 0.7 MPa, 1767 N push at 0.9 MPa, and a theoretical maximum of 200 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50BX190S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50BX190S replacement — usually within 7-8 hours.