This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50AX220S, 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 SI50AX220S
The AirTAC Airtac SI50 Standard Cylinder SI50AX220S 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 SAI50AX220S, 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 → SAI50AX220S
- 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 SI50AX220S
The AirTAC SI50AX220S is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 220mm stroke. Featuring a SUS420J2 stainless piston rod and a built-in magnet for legacy CS1-B/DS1-B switches, it delivers 982 N push force at 0.5 MPa through a G1/4 port. AirTAC replaced this EOL unit with the SAI50AX220S.
The SAI50AX220S is a direct replacement, matching the exact ISO 15552 mounting interface, bore, stroke, force and port size. It upgrades the piston seal to two Y-shaped one-way elements for lower start-up pressure and longer life. Note that plain cylinders drift without live air; for held loads explore the SAIL lock or BSAI clamp-lock variants the SI line lacked.
Airtac SI50 Standard Cylinder SI50AX220S Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50AX220S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50AX220S |
| 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 SAI50AX220S 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 SAI50AX220S 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 SI50AX220S
| 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 SI50AX220S Is Used
Stainless Rod Actuation
Leveraging the SUS420J2 rod for corrosion resistance, this 982 N cylinder drives mid-force machining clamps and tooling indexers in washdown or mildly humid production cells.
Package Diverting
Generating 825 N pull force at 0.5 MPa, it reliably pushes and retracts 220 mm to sort moderate-weight cartons or totes on automated packaging conveyors.
Replacing the Airtac SI50 Standard Cylinder SI50AX220S with the SAI50AX220S
To replace the SI50AX220S, order the SAI50AX220S. It drops directly into existing fixtures via the identical ISO 15552 mounting interface, keeping the same 50mm bore, 220mm stroke, M16x1.5 rod thread, G1/4 port, and -S magnet configuration (using current AirTAC switches instead of the legacy CS1-B/DS1-B). Confirm your mounting accessory (LB, FA, TC, etc.) and thread option (PT, G, NPT). When sizing both ways, a neighbouring 40mm bore yields 628 N push at 0.5 MPa, while a 63mm bore provides 1559 N. Because this 220mm stroke exceeds 300mm? No, but at 220mm you should still verify guide alignment to prevent rod bending under side loads. Remember the air cushion only decelerates the piston near stroke end; it does not hold the load. If you need positive holding on air loss, use an external pilot check valve, a rod lock, or step up to the SAIL or BSAI lock variant. The Viton H seal option expands the temperature range to 0-150 C.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50AX220S
- ✓ 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 SI50AX220S FAQ
Yes, the SI50AX220S is discontinued. The direct replacement is the SAI50AX220S. It is dimensionally interchangeable per ISO 15552, meaning it shares the same 50mm bore, 220mm stroke, G1/4 port, and mounting interface, but features an upgraded two Y-shaped one-way piston seal for longer life.
This double-acting cylinder uses a G1/4 air port. It delivers 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 force of 200 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50AX220S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50AX220S replacement — usually within 7-8 hours.