This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X189, 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 SI50X189
The AirTAC Airtac SI50 Standard Cylinder SI50X189 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 189mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X189, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke189 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X189
- 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 SI50X189
The AirTAC SI50X189 is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 189mm stroke. It delivers 982N push and 825N pull at 0.5MPa through a G1/4 port. The direct replacement is the SAI50X189, matching the exact interface, force and stroke.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. This no-S SKU lacks a magnet and cannot take a sensor.
Airtac SI50 Standard Cylinder SI50X189 Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X189 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X189 |
| Bore size | Ø50 mm |
| Stroke | 189 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 SAI50X189 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 SAI50X189 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 SI50X189
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×189 | 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 SI50X189 Is Used
Package Diverting
Drives diverting arms on packaging lines where the 982N push force at 0.5MPa easily redirects standard cartons.
Clamp Actuation
Provides reliable clamping pressure for medium-duty machining fixtures, utilizing the 825N pull force.
Gate Control
Operates heavy flow-control gates in material handling systems, benefiting from the 30mm adjustable cushions.
Replacing the Airtac SI50 Standard Cylinder SI50X189 with the SAI50X189
To replace the SI50X189, order the SAI50X189. Confirm the ISO 15552 mounting interface, 50mm bore, 189mm stroke, G1/4 port (PT/G/NPT threads), and your accessory type (LB, FA, TC, etc.). Because this is a no-S SKU, it cannot accept CS1-B/DS1-B sensors; order an SAI50X189S if sensing is needed. For sizing, neighbouring bores are 40mm (628N [email protected]) and 63mm (1559N). Note: 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 variants. At 189mm, side-load risk is low, but ensure straight alignment.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X189
- ✓ 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 SI50X189 FAQ
Yes, the AirTAC SI50X189 is discontinued. The direct replacement is the SAI50X189. It is dimensionally interchangeable per ISO 15552, retaining the same 50mm bore, 189mm stroke, G1/4 port, and mounting interface.
The G1/4 port bore 50mm cylinder delivers 982N push and 825N pull at 0.5MPa, 1374N push at 0.7MPa, 1767N at 0.9MPa, and a theoretical max of 200kgf at 1.0MPa. It operates at 30-800mm/s with a 30mm adjustable cushion.
Request a Quote for the SAI50X189
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X189 replacement — usually within 7-8 hours.