This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X700S, 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 SI50X700S
The AirTAC SI50 Standard Cylinder SI50X700S 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 SAI50X700S, 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 → SAI50X700S
- 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 SI50X700S
The AirTAC SI50X700S is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 700mm stroke. Delivering 982N push force at 0.5MPa, it features a G1/4 port and an integrated piston magnet for position sensing. AirTAC replaced this legacy unit with the SAI50X700S, a direct upgrade retaining the exact ISO 15552 mounting interface, bore, stroke, output force, and port size.
The SAI replacement introduces an upgraded piston seal utilizing two Y-shaped one-way elements for extended lifespan and lower start-up pressure. The SAI family also expands functionality with SAIL, SAIF, and BSAI lock or valve variants absent from the SI line. Your existing CS1-B/DS1-B legacy sensors will mount to the SI, while the SAI uses current AirTAC switches.
Airtac SI50 Standard Cylinder SI50X700S Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X700S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X700S |
| 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 SAI50X700S 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 SAI50X700S 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 SI50X700S
| 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 SI50X700S Is Used
Long-Stroke Diversion
Drives large packages across transfer lines using the 700mm stroke, safely managing loads near the 589N working limit.
Vertical Material Lift
Raises and lowers platforms carrying up to 50kg, relying on the 982N thrust at 0.5MPa for stable elevation changes.
Automated Press Ejection
Pushes finished parts out of machinery beds, utilizing the 1374N force at 0.7MPa to clear heavy obstructions.
Replacing the Airtac SI50 Standard Cylinder SI50X700S with the SAI50X700S
To replace the SI50X700S, order the SAI50X700S and verify your ISO 15552 mounting interface, 50mm bore, 700mm stroke, G1/4 port (PT/G/NPT), and mounting accessory. The integrated magnet (-S) carries over. Sizing both ways: a neighboring 40mm bore yields 628N push at 0.5MPa, while a 63mm bore provides 1559N. Note that a plain cylinder drifts on air loss since the air cushion only decelerates near stroke end; for load holding, specify an external rod lock, pilot check valve, or the SAIL/BSAI lock variant. Because the 700mm stroke exceeds 300mm, use external guides to prevent rod bending and side-load wear.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X700S
- ✓ 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 SI50X700S FAQ
Yes, the SI50X700S is discontinued. The direct replacement is the SAI50X700S. It is dimensionally interchangeable per ISO 15552, matching the 50mm bore, 700mm stroke, G1/4 port, and mounting fixtures.
This double-acting cylinder uses a G1/4 port. It generates 982N push and 825N pull at 0.5MPa, 1374N push at 0.7MPa, 1767N push at 0.9MPa, and a theoretical maximum of 200kgf at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50X700S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X700S replacement — usually within 7-8 hours.