This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X680SH, 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 SI50X680SH
The AirTAC Airtac SI50 Standard Cylinder SI50X680SH is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 680mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X680SH, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke680 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X680SH
- 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 SI50X680SH
The AirTAC SI50X680SH is a discontinued double-acting ISO 15552 profile cylinder featuring a 50mm bore, 680mm stroke, and a G1/4 port. Delivering 982N push force at 0.5MPa, it is directly replaced by the SAI50X680SH. This direct upgrade shares the exact ISO 15552 mounting interface, bore, stroke, force, and port, fitting existing fixtures perfectly.
The SAI replacement features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life. Your -S magnet works with legacy CS1-B/DS1-B sensors, while the -H Viton seal extends operation to 150C.
Airtac SI50 Standard Cylinder SI50X680SH Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X680SH |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X680SH |
| Bore size | Ø50 mm |
| Stroke | 680 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 SAI50X680SH 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 SAI50X680SH 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 SI50X680SH
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×680 | 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 SI50X680SH Is Used
Long-Stroke Diversion
Pushes packages across transfer lines using the full 680mm extension, relying on the 982N thrust at 0.5MPa for reliable actuation.
High-Temp Ejection
Ejects molded parts near heat zones where the -H Viton seal survives up to 150C, handling repetitive cycling without degradation.
Replacing the Airtac SI50 Standard Cylinder SI50X680SH with the SAI50X680SH
To replace the SI50X680SH, order the SAI50X680SH. Confirm the ISO 15552 mounting interface, 50mm bore, 680mm stroke, G1/4 port (PT/G/NPT), and your specific mounting accessory. The -S magnet enables CS1-B/DS1-B sensors, and the -H Viton seal handles high temperatures. For sizing alternatives, a 40mm bore yields 628N push at 0.5MPa, while a 63mm bore provides 1559N. 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 variants. Because 680mm exceeds 300mm, use external guides to prevent rod bending and side-load wear.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X680SH
- ✓ 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 SI50X680SH FAQ
Yes, the SI50X680SH is discontinued. The direct replacement is the SAI50X680SH. It shares the same ISO 15552 mounting interface, 50mm bore, 680mm stroke, output force, and G1/4 port, fitting existing fixtures seamlessly.
This double-acting cylinder has a G1/4 port. It delivers 982N push and 825N pull at 0.5MPa, 1374N push at 0.7MPa, and 1767N push at 0.9MPa. The theoretical maximum force is 200kgf at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50X680SH
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X680SH replacement — usually within 7-8 hours.