This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X300SN, 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 SI50X300SN
The AirTAC SI50 Standard Cylinder SI50X300SN is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 300mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X300SN, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke300 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X300SN
- 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 SI50X300SN
The AirTAC SI50X300SN is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 300mm stroke. Delivering 982 N push force at 0.5 MPa via a G1/4 port, it is replaced by the SAI50X300SN. This direct successor shares identical ISO 15552 mounting dimensions, bore, stroke, and output force.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. This SI50X300SN includes a piston magnet for CS1-B/DS1-B switches and an NBR seal (-20 to +70 C; Viton H raises this to 150 C).
Airtac SI50 Standard Cylinder SI50X300SN Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X300SN |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X300SN |
| Bore size | Ø50 mm |
| Stroke | 300 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 SAI50X300SN 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 SAI50X300SN 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 SI50X300SN
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×300 | 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 SI50X300SN Is Used
Material Diversion
Actuates sorting gates on packaging lines, using the 982 N push force to deflect medium-weight cartons reliably at speed.
Pallet Handling
Drives lifting forks or indexing pins in automated storage fixtures, fitting existing ISO 15552 foot and clevis mounts.
Replacing the Airtac SI50 Standard Cylinder SI50X300SN with the SAI50X300SN
To replace the SI50X300SN, order the SAI50X300SN. Confirm the ISO 15552 interface, G1/4 port, M16x1.5 rod thread, and 300mm stroke. The built-in magnet (-S) works with legacy CS1-B/DS1-B sensors, while the SAI uses current AirTAC switches. For sizing, the 50mm bore yields 982 N push at 0.5 MPa; dropping to a 40mm bore gives 628 N, while a 63mm bore provides 1559 N. Because this is a 300mm stroke, use external guides to prevent rod bending and side-load wear. A plain cylinder drifts on air loss—the cushion only decelerates. For load holding, use an external pilot check valve, or specify the SAIL or BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X300SN
- ✓ 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 SI50X300SN FAQ
Yes, the SI50X300SN is discontinued. The direct replacement is the SAI50X300SN. It shares the same ISO 15552 mounting interface, 50mm bore, 300mm stroke, output force, and G1/4 port, so it fits directly into existing fixtures.
The G1/4 port feeds a 20mm piston rod. At 0.5 MPa it provides 982 N push and 825 N pull force. 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 SAI50X300SN
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X300SN replacement — usually within 7-8 hours.