This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X220S, 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 SI50X220S
The AirTAC Airtac SI50 Standard Cylinder SI50X220S 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 SAI50X220S, 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 → SAI50X220S
- 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 SI50X220S
The AirTAC SI50X220S 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. AirTAC replaced this legacy unit with the SAI50X220S, a direct upgrade retaining the exact interface, dimensions, and output.
The SAI successor features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life. The original SI line lacked lock variants, but the SAI family adds SAIL and BSAI options. The -S suffix denotes a piston magnet for legacy CS1-B/DS1-B sensors.
Airtac SI50 Standard Cylinder SI50X220S Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X220S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X220S |
| 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 SAI50X220S 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 SAI50X220S 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 SI50X220S
| 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 SI50X220S Is Used
Package Diverting
Actuates routing gates on packaging lines using the 982N push force, with the 220mm stroke providing full lane-clearance travel.
Pallet Stopping
Deploys a mechanical stop block for low-inertia pallets, safely handling the 50kg vertical-lift equivalent load.
Clamp Actuation
Drives mid-force clamping fixtures on machining cells, relying on the 30mm adjustable air cushions for smooth end-of-stroke deceleration.
Replacing the Airtac SI50 Standard Cylinder SI50X220S with the SAI50X220S
To replace the SI50X220S, order the SAI50X220S. Confirm the ISO 15552 mounting interface, 50mm bore, 220mm stroke, M16x1.5 rod thread, and G1/4 port (PT/G/NPT). Retain your mounting accessory (LB, FA, TC, etc.) and the -S magnet requirement for current AirTAC switches. For sizing, the neighbouring 63mm bore yields 1559N push at 0.5MPa, while dropping to 40mm gives 628N. Note that a plain cylinder drifts on air loss; the cushion only decelerates. For load holding, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant. At 220mm stroke, guide the load to prevent rod bending and side-load wear.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X220S
- ✓ 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 SI50X220S FAQ
Yes, the SI50X220S is discontinued. The direct replacement is the AirTAC SAI50X220S. It is dimensionally interchangeable per ISO 15552, matching the 50mm bore, 220mm stroke, 982N force, G1/4 port, and mounting interface.
This double-acting cylinder uses a G1/4 air port. It generates 982N push and 825N pull at 0.5MPa, 1374N push at 0.7MPa, and 1767N at 0.9MPa. The theoretical maximum force is 200kgf at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50X220S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X220S replacement — usually within 7-8 hours.