This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X305SN, 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 SI50X305SN
The AirTAC SI50 Standard Cylinder SI50X305SN 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 SAI50X305SN, 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 → SAI50X305SN
- 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 SI50X305SN
The AirTAC SI50X305SN is a discontinued double-acting ISO 15552 profile cylinder with a 50 mm bore and 305 mm stroke. It delivers a push force of 982 N at 0.5 MPa via a G1/4 port. The direct replacement is the SAI50X305SN, retaining the exact interface, force, and mounting.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure. The NBR seal handles -20 to +70 C, while Viton H extends to 150 C. The SAIL lock and SAIF valve variants expand options. The -S magnet works with CS1-B/DS1-B sensors.
Airtac SI50 Standard Cylinder SI50X305SN Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X305SN |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X305SN |
| 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 SAI50X305SN 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 SAI50X305SN 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 SI50X305SN
| 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 SI50X305SN Is Used
Package Diverting
Drives diverter arms on packaging lines using the 982 N push force to redirect cartons at high speeds.
Clamp Actuation
Secures medium workpieces in machining fixtures, utilizing the adjustable 30 mm cushions for smooth stops.
Replacing the Airtac SI50 Standard Cylinder SI50X305SN with the SAI50X305SN
To replace the SI50X305SN, order the SAI50X305SN. Confirm the ISO 15552 mounting interface, G1/4 port, M16x1.5 rod thread, and 305 mm stroke. The -S magnet enables CS1-B/DS1-B sensors (SAI uses current switches), and the -N NBR seal suits standard temps. For sizing, the 50 mm bore yields 982 N push at 0.5 MPa; dropping to 40 mm gives 628 N, while 63 mm provides 1559 N. At 305 mm, use external guides to prevent rod bending and side loads. A plain cylinder drifts on air loss; for load holding, use an external rod lock, pilot check valve, or SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X305SN
- ✓ 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 SI50X305SN FAQ
Yes, the SI50X305SN is discontinued. The direct replacement is the SAI50X305SN. It is dimensionally interchangeable per ISO 15552, retaining the same 50 mm bore, 305 mm stroke, force, G1/4 port, and mounting interface.
It features a G1/4 air port. The force ratings are: 982 N push and 825 N pull at 0.5 MPa, 1374 N push at 0.7 MPa, 1767 N push at 0.9 MPa, and a theoretical maximum of 200 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50X305SN
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X305SN replacement — usually within 7-8 hours.