This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X210, 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 SI50X210
The AirTAC Airtac SI50 Standard Cylinder SI50X210 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 210mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X210, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke210 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X210
- 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 SI50X210
The AirTAC SI50X210 is a discontinued double-acting ISO 15552 profile cylinder with a 50 mm bore and 210 mm stroke. Delivering 982 N push and 825 N pull at 0.5 MPa via a G1/4 port, it is replaced by the SAI50X210. This direct successor shares the exact mounting interface, bore, stroke, force and port size.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. Because this specific SI SKU lacks the -S magnet, it cannot accept a CS1-B or DS1-B sensor. For high heat, Viton H seals raise the temperature limit to 150 C.
Airtac SI50 Standard Cylinder SI50X210 Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X210 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X210 |
| Bore size | Ø50 mm |
| Stroke | 210 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 SAI50X210 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 SAI50X210 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 SI50X210
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×210 | 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 SI50X210 Is Used
Package Diverting
Actuates routing gates on packaging lines where the 982 N push force at 0.5 MPa easily deflects standard cartons.
Light Pressing
Provides consistent downward pressure for assembling small components, utilizing the 825 N pull force for return.
Pallet Stops
Functions as a pneumatic stop in conveyor endpoints, holding loads safely within the 589 N working limit.
Replacing the Airtac SI50 Standard Cylinder SI50X210 with the SAI50X210
To replace the SI50X210, order the SAI50X210. Confirm the ISO 15552 mounting accessory (LB, FA, TC, etc.), the G1/4 port thread (PT, G or NPT), and note this non-magnetic SKU cannot hold a switch. For sizing both ways: a 40 mm bore gives 628 N push at 0.5 MPa, while a 63 mm bore yields 1559 N. With a 210 mm stroke, guide the load to prevent rod bending and side-load wear. A plain cylinder drifts on air loss; for load holding, use an external pilot check valve, rod lock, or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X210
- ✓ 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 SI50X210 FAQ
Yes, the AirTAC SI50X210 is discontinued. The direct replacement is the SAI50X210. It is dimensionally interchangeable per ISO 15552, retaining the same 50 mm bore, 210 mm stroke, G1/4 port and mounting interface.
This double-acting cylinder uses a G1/4 air port. It generates 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.
Request a Quote for the SAI50X210
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X210 replacement — usually within 7-8 hours.