This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50AX190S, 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 SI50AX190S
The AirTAC Airtac SI50 Standard Cylinder SI50AX190S 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 SAI50AX190S, 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 → SAI50AX190S
- 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 SI50AX190S
The AirTAC SI50AX190S is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore, 190mm stroke, and a SUS420J2 stainless steel piston rod. Generating 982N push force at 0.5MPa, it is directly replaced by the SAI50AX190S. This direct upgrade shares the exact ISO 15552 mounting interface, G1/4 port, and M16x1.5 rod thread, fitting existing fixtures seamlessly.
The SAI replacement features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life. The built-in magnet supports legacy CS1-B/DS1-B sensors, and a Viton H seal option extends operating temperature to 150C.
Airtac SI50 Standard Cylinder SI50AX190S Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50AX190S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50AX190S |
| 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 SAI50AX190S 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 SAI50AX190S 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 SI50AX190S
| 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 SI50AX190S Is Used
Stainless Rod Clamping
Ideal for repetitive part clamping in machining cells where the SUS420J2 rod resists coolant spray and moisture.
Package Diverting
Provides reliable 190mm stroke actuation for diverting medium-weight packages on packaging lines at 50kg lift capacity.
Vertical Lift Gates
Suitable for lifting lightweight access gates or stops, utilizing the 982N thrust to move 50kg loads with a safety margin.
Replacing the Airtac SI50 Standard Cylinder SI50AX190S with the SAI50AX190S
To replace the SI50AX190S, order the SAI50AX190S. Verify your ISO 15552 mounting accessory (LB, FA, TC, etc.), the G1/4 air port, and the M16x1.5 rod thread. The -S denotes a magnet for CS1-B/DS1-B switches; the SAI uses current AirTAC switches. The -A indicates a SUS420J2 stainless rod for corrosion resistance. For sizing, a 40mm bore yields 628N push at 0.5MPa, while a 63mm bore yields 1559N. 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 variants. The SAIF variant integrates a 4M valve for bores up to 100mm.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50AX190S
- ✓ 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 SI50AX190S FAQ
Yes, the SI50AX190S is discontinued. The direct replacement is the SAI50AX190S. It shares the same ISO 15552 mounting interface, 50mm bore, 190mm stroke, G1/4 port, and output force, fitting directly into existing fixtures.
The 50mm bore features a G1/4 air port and M16x1.5 rod thread. Force output is 982N push and 825N pull at 0.5MPa, 1374N push at 0.7MPa, 1767N push at 0.9MPa, and a theoretical max of 200kgf at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50AX190S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50AX190S replacement — usually within 7-8 hours.