This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X220STC, 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 SI50X220STC
The AirTAC Airtac SI50 Standard Cylinder SI50X220STC 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 SAI50X220STC, 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 → SAI50X220STC
- 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 SI50X220STC
The AirTAC SI50X220STC is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 220mm stroke. It delivers 982N push force at 0.5MPa via a G1/4 port. The direct replacement is the SAI50X220STC, which shares identical mounting, force, and porting for seamless fixture integration.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. It also adds SAIL, SAIF, and BSAI variants the SI lacked. The -S code denotes a piston magnet for legacy CS1-B/DS1-B sensors, while the SAI uses current AirTAC switches.
Airtac SI50 Standard Cylinder SI50X220STC Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X220STC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X220STC |
| 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 SAI50X220STC 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 SAI50X220STC 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 SI50X220STC
| 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 SI50X220STC Is Used
Package Diverting
Drives diverting arms on packaging lines using the TC trunnion mount to handle the 220mm stroke and 982N push force efficiently.
Pallet Positioning
Pushes or aligns light pallets at workstations, where the 50mm bore provides sufficient force without overpowering the load.
Vertical Lowering
Controls the descent of light 50kg vertical loads, relying on adjustable air cushions to decelerate smoothly at stroke end.
Replacing the Airtac SI50 Standard Cylinder SI50X220STC with the SAI50X220STC
To replace the SI50X220STC, order the SAI50X220STC. Confirm the ISO 15552 TC trunnion mount, 50mm bore, 220mm stroke, G1/4 port, and the -S magnet. Sizing both ways: a neighbouring 63mm bore yields 1559N push at 0.5MPa, while dropping to 40mm gives 628N. At 220mm stroke, guide the load to prevent rod bending and side-load wear. A plain cylinder drifts on air loss; the cushion only decelerates. For load holding, use an external pilot check valve, rod lock, or the SAIL/BSAI lock variants. Rod material options include carbon steel, SUS420J2 (A), or SUS304 (B).
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X220STC
- ✓ 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 SI50X220STC FAQ
Yes, the AirTAC SI50X220STC is discontinued. The direct replacement is the SAI50X220STC. It is dimensionally interchangeable per ISO 15552, retaining the same 50mm bore, 220mm stroke, G1/4 port, TC mount, and 982N force.
The 50mm bore features a G1/4 air port and delivers 982N push and 825N pull at 0.5MPa. At 0.7MPa push is 1374N, and at 0.9MPa it is 1767N. The theoretical maximum force is 200kgf at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50X220STC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X220STC replacement — usually within 7-8 hours.