This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X675S, 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 SI50X675S
The AirTAC SI50 Standard Cylinder SI50X675S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 675mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X675S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke675 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X675S
- 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 SI50X675S
The AirTAC SI50X675S is a discontinued double-acting ISO 15552 profile cylinder featuring a 50mm bore, 675mm stroke, and a G1/4 air port. Delivering 982N push force at 0.5MPa, it is replaced by the direct replacement SAI50X675S, sharing identical mounting and output. The SAI upgrade uses two Y-shaped piston seals for low start-up pressure, and adds SAIL/BSAI lock variants the SI lacked.
This -S model includes a piston magnet for legacy CS1-B/DS1-B sensors. Note that air cushions only decelerate; use an external rod lock or pilot check valve to hold loads, especially on this 675mm stroke which requires external guides to prevent rod bending.
Airtac SI50 Standard Cylinder SI50X675S Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X675S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X675S |
| Bore size | Ø50 mm |
| Stroke | 675 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 SAI50X675S 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 SAI50X675S 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 SI50X675S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×675 | 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 SI50X675S Is Used
Long-Stroke Diversion
Pushes packages across a 675mm conveyor lane using the 982N push force, requiring external guides to support the extended rod.
Component Indexing
Shifts a tooling carriage 675mm along an assembly line, relying on the G1/4 port and adjustable cushions for smooth stops.
Replacing the Airtac SI50 Standard Cylinder SI50X675S with the SAI50X675S
To replace the SI50X675S, order the SAI50X675S, verifying the ISO 15552 mounting interface, G1/4 port, and magnet. If more force is needed, the 63mm bore yields 1559N at 0.5MPa; if less suffices, the 40mm bore provides 628N. The 675mm stroke demands external guides to prevent rod bending under side loads. Standard cylinders drift without air; for load holding, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variants. The SAI family also offers the SAIF self-valve option (bores 32-100) the SI line lacked.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X675S
- ✓ 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 SI50X675S FAQ
Yes, the SI50X675S is discontinued. The direct replacement is the SAI50X675S. It is dimensionally interchangeable per ISO 15552, retaining the same 50mm bore, 675mm stroke, G1/4 port, and mounting interface. The SAI features an upgraded two Y-shaped piston seal for longer life.
The 50mm bore uses a G1/4 air port. At 0.5MPa it provides 982N push and 825N pull force. At 0.7MPa the push force is 1374N, and the theoretical maximum force is 200kgf at 1.0MPa. Operating speed is 30-800mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50X675S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X675S replacement — usually within 7-8 hours.