This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X220, 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 SI50X220
The AirTAC Airtac SI50 Standard Cylinder SI50X220 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 220mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X220, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke220 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X220
- 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 SI50X220
The AirTAC SI50X220 is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 220mm stroke. It delivers 982 N push and 825 N pull at 0.5 MPa through a G1/4 port. The direct replacement is the SAI50X220, matching the interface, force, and mounting.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. Note this SKU lacks a magnet and cannot take a sensor; legacy -S versions used CS1-B/DS1-B switches.
Airtac SI50 Standard Cylinder SI50X220 Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X220 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X220 |
| Bore size | Ø50 mm |
| Stroke | 220 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 SAI50X220 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 SAI50X220 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 SI50X220
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×220 | 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 SI50X220 Is Used
Package Diverting
Pushes cartons off a main conveyor belt using 982 N of thrust at 0.5 MPa, fitting neatly into existing ISO 15552 fixture spacing.
Pallet Stopper Gate
Acts as a pneumatic stop for incoming pallets, absorbing impact via the 30mm adjustable air cushions at both ends.
Component Clamping
Holds aluminum castings in place for CNC machining, providing 825 N pull force while handling the 220mm stroke length.
Replacing the Airtac SI50 Standard Cylinder SI50X220 with the SAI50X220
To replace the SI50X220, order the SAI50X220. Confirm the ISO 15552 mounting interface, 50mm bore, 220mm stroke, G1/4 port (PT/G/NPT), and accessory type (LB, FA, TC, etc.). This non-magnet SKU cannot accept a switch. At 0.5 MPa it yields 982 N push; sizing down, a 40mm bore gives 628 N, while an 80mm bore provides 2513 N. The 220mm stroke is under the 1200mm standard limit, but for strokes over 300mm, always use guide rails to prevent rod bending and side-load wear. A plain cylinder drifts on air loss; for load holding, use an external pilot check valve or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X220
- ✓ 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 SI50X220 FAQ
Yes, the SI50X220 is discontinued. The direct replacement is the SAI50X220. It is dimensionally interchangeable per ISO 15552, retaining the same 50mm bore, 220mm stroke, G1/4 port, and mounting interface.
The G1/4 port feeds a piston delivering 982 N push and 825 N pull at 0.5 MPa, 1374 N push at 0.7 MPa, 1767 N at 0.9 MPa, and a maximum theoretical force of 200 kgf at 1.0 MPa. Operating speed is 30-800 mm/s.
Request a Quote for the SAI50X220
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X220 replacement — usually within 7-8 hours.