This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X610S, 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 SI50X610S
The AirTAC Airtac SI50 Standard Cylinder SI50X610S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 610mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X610S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke610 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X610S
- 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 SI50X610S
The AirTAC SI50X610S is a discontinued double-acting ISO 15552 profile cylinder with a 50 mm bore and 610 mm stroke. It delivers 982 N push force at 0.5 MPa via a G1/4 port. AirTAC replaced this legacy unit with the SAI50X610S, a direct upgrade sharing the exact ISO 15552 mounting interface, bore, stroke, output force and accessories.
The SAI successor features an upgraded piston seal using two Y-shaped one-way elements for low start-up pressure and long life. The original -S magnet supports legacy CS1-B/DS1-B sensors, while the SAI family also introduces SAIL, SAIF and BSAI lock variants the SI line lacked.
Airtac SI50 Standard Cylinder SI50X610S Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X610S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X610S |
| Bore size | Ø50 mm |
| Stroke | 610 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 SAI50X610S 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 SAI50X610S 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 SI50X610S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×610 | 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 SI50X610S Is Used
Long-Stroke Diversion
Pushes packages across transfer lines using the full 610 mm extension, relying on external guides to prevent rod bending during lateral diversion.
Pallet Positioning
Indexes pallets into wrapping stations, using adjustable end cushions to decelerate the 982 N thrust smoothly at the end of the 610 mm travel.
Replacing the Airtac SI50 Standard Cylinder SI50X610S with the SAI50X610S
To replace the SI50X610S, order the SAI50X610S. Confirm the ISO 15552 mounting interface, 50 mm bore, 610 mm stroke, G1/4 port (PT/G/NPT thread options) and your specific mounting accessory (LB, FA, TC, etc.). The -S magnet equips it for CS1-B/DS1-B switches. Sizing both ways: a neighbouring 63 mm bore offers 1559 N push at 0.5 MPa, while dropping to 40 mm yields 628 N. Because this is a 610 mm stroke, use external guides to prevent rod bending and side-load damage. A plain cylinder drifts without live air; for load holding, specify the SAIL lock variant, BSAI clamp-lock, or an external pilot check valve.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X610S
- ✓ 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 SI50X610S FAQ
Yes, the SI50X610S is discontinued. The direct replacement is the SAI50X610S. It is dimensionally interchangeable per ISO 15552, retaining the same 50 mm bore, 610 mm stroke, G1/4 port and mounting interface.
This 50 mm bore double-acting cylinder features a G1/4 air port and a 20 mm rod. It generates 982 N push and 825 N pull at 0.5 MPa, 1374 N push at 0.7 MPa, and a theoretical maximum of 200 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50X610S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X610S replacement — usually within 7-8 hours.