This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X190, 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 SI50X190
The AirTAC Airtac SI50 Standard Cylinder SI50X190 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 SAI50X190, 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 → SAI50X190
- 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 SI50X190
The AirTAC SI50X190 is a discontinued double-acting ISO 15552 profile cylinder with a 50 mm bore and 190 mm stroke. It delivers 982 N push and 825 N pull at 0.5 MPa through a G1/4 port. AirTAC replaced this legacy unit with the SAI50X190, a direct replacement sharing the exact ISO 15552 mounting interface, bore, stroke, force and port size.
The SAI50X190 upgrades the piston seal to two Y-shaped one-way elements for lower start-up pressure and longer life. For sensing, note this specific SI SKU lacks the -S magnet and cannot accept a CS1-B/DS1-B switch. For high heat, Viton H seals raise the temperature limit to 150 C.
Airtac SI50 Standard Cylinder SI50X190 Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X190 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X190 |
| 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 SAI50X190 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 SAI50X190 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 SI50X190
| 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 SI50X190 Is Used
Package Diverting
Actuates routing gates on packaging lines using the 982 N push force at 0.5 MPa to deflect medium-weight cartons reliably.
Pallet Stopping
Functions as a pneumatic stop for roller conveyors, utilizing the 190 mm stroke to halt pallets safely during sequencing.
Clamp Actuation
Drives medium-duty clamping fixtures in CNC machining cells, where the 825 N pull force securely holds workpieces.
Replacing the Airtac SI50 Standard Cylinder SI50X190 with the SAI50X190
To replace the SI50X190, order the SAI50X190. Confirm the ISO 15552 mounting accessory (LB foot, FA flange, TC trunnion), the G1/4 port thread (PT/G/NPT), and that you do not need a magnet, as this no-S SKU cannot mount a sensor. Because this stroke is under 300 mm, rod-bending side loads are minimal, but always guide the load. If sizing up or down, a 40 mm bore yields 628 N push at 0.5 MPa, while a 63 mm bore yields 1559 N. Remember a plain cylinder drifts on air loss; for load holding, specify the SAIL lock or BSAI clamp-lock variant, or use an external pilot check valve.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X190
- ✓ 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 SI50X190 FAQ
Yes, the SI50X190 is discontinued. The direct replacement is the AirTAC SAI50X190. It features the same ISO 15552 mounting interface, 50 mm bore, 190 mm stroke, output force, and G1/4 port, fitting existing fixtures perfectly.
The bore is 50 mm with a G1/4 air port. 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. Operating speed is 30-800 mm/s.
Request a Quote for the SAI50X190
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X190 replacement — usually within 7-8 hours.