This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X700SN, 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 SI50X700SN
The AirTAC Airtac SI50 Standard Cylinder SI50X700SN is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 700mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X700SN, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke700 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X700SN
- 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 SI50X700SN
The AirTAC SI50X700SN is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 700mm stroke. It delivers 982 N push force at 0.5 MPa via a G1/4 port. The direct replacement is the SAI50X700SN, matching the exact bore, stroke, force, and ISO 15552 mounting interface for existing fixtures.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. This -S/-N variant includes a piston magnet for CS1-B/DS1-B switches and NBR seals (-20 to +70 C); Viton H raises this to 150 C.
Airtac SI50 Standard Cylinder SI50X700SN Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X700SN |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X700SN |
| Bore size | Ø50 mm |
| Stroke | 700 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 SAI50X700SN 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 SAI50X700SN 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 SI50X700SN
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×700 | 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 SI50X700SN Is Used
Long-Stroke Diversion
Pushes packages across transfer lines with a 700mm reach, yielding 589 N of safe working force at 0.5 MPa.
Vertical Material Lift
Raises 50 kg payloads through a 700mm vertical stroke, requiring an external guide to prevent rod bending.
Multi-Station Indexing
Shifts tooling carriages between machining stations, relying on adjustable 30mm air cushions for smooth stops.
Replacing the Airtac SI50 Standard Cylinder SI50X700SN with the SAI50X700SN
To replace the SI50X700SN, order the SAI50X700SN. Confirm the ISO 15552 interface, 50mm bore, 700mm stroke, G1/4 port, and mounting accessory. The built-in magnet (-S) works with legacy CS1-B/DS1-B sensors, though the SAI uses current AirTAC switches. The NBR seal (-N) is standard. At 700mm, prevent rod bending by using an external guide to handle side loads. If sizing up or down, the 63mm bore yields 1559 N push at 0.5 MPa, while the 40mm bore yields 628 N. Remember, a plain cylinder drifts on air loss; for load holding, use an external pilot check valve or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X700SN
- ✓ 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 SI50X700SN FAQ
Yes, the SI50X700SN is discontinued. The direct replacement is the SAI50X700SN. It is dimensionally interchangeable per ISO 15552, retaining the same 50mm bore, 700mm stroke, 982 N force, G1/4 port, and mounting interface.
It features a G1/4 air port and provides 982 N push and 825 N pull at 0.5 MPa. At 0.7 MPa push is 1374 N, and at 0.9 MPa it is 1767 N. The theoretical maximum force is 200 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50X700SN
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X700SN replacement — usually within 7-8 hours.