This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50AX300, 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 SI50AX300
The AirTAC Airtac SI50 Standard Cylinder SI50AX300 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 SAI50AX300, 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 → SAI50AX300
- 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 SI50AX300
The AirTAC SI50AX300 is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 300mm stroke. It delivers a push force of 982 N at 0.5 MPa via a G1/4 port. The direct replacement is the SAI50AX300, which shares identical ISO 15552 mounting-interface dimensions, bore, stroke, output force, and accessories.
The SAI upgrade features a modernized piston seal with two Y-shaped one-way elements for low start-up pressure and long life. This -A variant uses a SUS420J2 stainless steel piston rod for corrosion resistance. Lacking the -S magnet, this SKU cannot take a sensor.
Airtac SI50 Standard Cylinder SI50AX300 Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50AX300 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50AX300 |
| 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 SAI50AX300 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 SAI50AX300 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 SI50AX300
| 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 SI50AX300 Is Used
Material Diversion
Actuates routing flaps on package conveyors, providing reliable 982 N push force to redirect heavy cartons at sorting hubs.
Vertical Lowering
Controls the descent of a 50 kg payload using the 300mm stroke, requiring external guides to prevent rod bending.
Press Fixture
Drives a clamping press in humid environments, utilizing the SUS420J2 stainless rod option for corrosion resistance.
Replacing the Airtac SI50 Standard Cylinder SI50AX300 with the SAI50AX300
To replace the SI50AX300, order the SAI50AX300. Verify the ISO 15552 mounting interface, 50mm bore, 300mm stroke, G1/4 port (PT/G/NPT thread), and your specific mounting accessory. Because this is a 300mm stroke, prevent rod bending by guiding the load externally to avoid side loads. If you need to hold position, note that a plain cylinder drifts on air loss—the cushion only decelerates—so use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant. If 982 N push at 0.5 MPa is insufficient, step up to the 63mm bore (1559 N); if excessive, drop to 40mm (628 N).
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50AX300
- ✓ 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 SI50AX300 FAQ
Yes, the SI50AX300 is discontinued. The direct replacement is the SAI50AX300. It is dimensionally interchangeable per ISO 15552, retaining the same 50mm bore, 300mm stroke, 982 N force, G1/4 port, and mounting interface.
This double-acting cylinder features a G1/4 air port and M16x1.5 rod thread. 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 max of 200 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50AX300
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50AX300 replacement — usually within 7-8 hours.