This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X442S, 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 SI50X442S
The AirTAC Airtac SI50 Standard Cylinder SI50X442S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 442mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X442S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke442 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X442S
- 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 SI50X442S
The AirTAC SI50X442S is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 442mm stroke. Delivering 982N push force at 0.5MPa via a G1/4 port, it is replaced by the direct replacement SAI50X442S, sharing the exact mounting interface and output. The SAI upgrade features two Y-shaped piston seals for low start-up pressure and long life.
This -S variant includes a piston magnet for legacy CS1-B/DS1-B sensors. For high heat, Viton H seals raise the limit to 150C. Note that air cushions only decelerate; use SAIL or BSAI lock variants to hold loads.
Airtac SI50 Standard Cylinder SI50X442S Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X442S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X442S |
| Bore size | Ø50 mm |
| Stroke | 442 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 SAI50X442S 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 SAI50X442S 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 SI50X442S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×442 | 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 SI50X442S Is Used
Package Diverting
Drives diverter arms on sorting lines where the 982N push force easily redirects standard totes.
Vertical Lowering
Lowers light platens up to 50kg; external guides are required to manage rod bending over the 442mm extension.
Clamp Actuation
Secures workpieces during machining, though an external check valve is needed if air pressure is lost.
Replacing the Airtac SI50 Standard Cylinder SI50X442S with the SAI50X442S
To replace the SI50X442S, order the SAI50X442S, confirming the ISO 15552 interface, 50mm bore, 442mm stroke, G1/4 port (PT/G/NPT), and mounting accessory. The -S magnet uses current AirTAC switches on the SAI. Sizing both ways: a 63mm bore offers 1559N at 0.5MPa, while a 40mm bore yields 628N. For the 442mm stroke, use external guides to prevent rod bending and side-load wear. A plain cylinder drifts without air; for load holding, specify the SAIL lock, BSAI clamp-lock, or an external pilot check valve.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X442S
- ✓ 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 SI50X442S FAQ
Yes, the SI50X442S is discontinued. The direct replacement is the SAI50X442S. It is dimensionally interchangeable per ISO 15552, matching the 50mm bore, 442mm stroke, G1/4 port, and mounting hardware.
The 50mm bore uses a G1/4 port. Forces are: 982N push and 825N pull at 0.5MPa, 1374N push at 0.7MPa, 1767N push at 0.9MPa, and a theoretical max of 200 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50X442S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X442S replacement — usually within 7-8 hours.