This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X305S, 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 SI50X305S
The AirTAC Airtac SI50 Standard Cylinder SI50X305S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 305mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X305S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke305 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X305S
- 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 SI50X305S
The AirTAC SI50X305S is a discontinued double-acting ISO 15552 profile cylinder featuring a 50 mm bore and 305 mm stroke. It delivers 982 N push force at 0.5 MPa through a G1/4 port. AirTAC replaced this legacy unit with the SAI50X305S, a direct upgrade retaining the exact ISO 15552 mounting interface, bore, stroke, and output force.
The SAI replacement introduces an upgraded piston seal with two Y-shaped one-way elements for lower start-up pressure and longer life. The original -S magnet supports CS1-B/DS1-B sensors, while the SAI family adds lock variants like SAIL and BSAI absent from the SI line.
Airtac SI50 Standard Cylinder SI50X305S Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X305S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X305S |
| Bore size | Ø50 mm |
| Stroke | 305 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 SAI50X305S 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 SAI50X305S 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 SI50X305S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×305 | 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 SI50X305S Is Used
Package Diverting
Drives diverting arms on packaging lines, utilizing the 305 mm stroke to push cartons cleanly onto adjacent conveyor belts.
Pallet Positioning
Indexes empty pallets into loading zones, providing reliable horizontal shifting with 982 N of push force at 0.5 MPa.
Replacing the Airtac SI50 Standard Cylinder SI50X305S with the SAI50X305S
To replace the SI50X305S, order the SAI50X305S and confirm the ISO 15552 mounting interface, 305 mm stroke, and G1/4 port (PT/G/NPT). Retain your original mounting accessory and the -S magnet requirement. Sizing context: a 50 mm bore yields 982 N push at 0.5 MPa, whereas the neighboring 63 mm bore provides 1559 N. For the 305 mm stroke, use an external guide to prevent rod bending and side-load damage. Note that a standard cylinder does not hold load without live air; the cushion only decelerates. For load holding, specify the SAIL or BSAI lock variant, or use an external pilot check valve.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X305S
- ✓ 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 SI50X305S FAQ
Yes, the AirTAC SI50X305S is discontinued. The direct replacement is the SAI50X305S. It is dimensionally interchangeable per ISO 15552, matching the 50 mm bore, 305 mm stroke, G1/4 port, and mounting interface, so it fits existing fixtures perfectly.
This 50 mm bore cylinder uses a G1/4 air port. It delivers 982 N push and 825 N pull at 0.5 MPa, 1374 N push at 0.7 MPa, and 1767 N push at 0.9 MPa. The theoretical maximum force is 200 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50X305S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X305S replacement — usually within 7-8 hours.