This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X380, 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 SI50X380
The AirTAC Airtac SI50 Standard Cylinder SI50X380 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 380mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X380, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke380 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X380
- 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 SI50X380
The AirTAC SI50X380 is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 380mm stroke, delivering 982N push force at 0.5MPa. AirTAC replaced it with the SAI50X380 direct replacement, matching the exact bore, stroke, G1/4 port and ISO 15552 mounting interface.
The SAI upgrade features a new piston seal with two Y-shaped one-way elements for low start-up pressure and long life. Because this specific SI50X380 SKU lacks a magnet (-S), it cannot accept position sensors.
Airtac SI50 Standard Cylinder SI50X380 Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X380 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X380 |
| Bore size | Ø50 mm |
| Stroke | 380 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 SAI50X380 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 SAI50X380 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 SI50X380
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×380 | 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 SI50X380 Is Used
Material Diversion
Actuates sorting flaps on packaging lines using its 380mm stroke to push items into secondary lanes.
Part Ejection
Ejects machined components from fixtures, utilizing the 982N push force at 0.5MPa to clear the work area.
Replacing the Airtac SI50 Standard Cylinder SI50X380 with the SAI50X380
To replace the SI50X380, order the SAI50X380. Verify the ISO 15552 mounting interface, 50mm bore, 380mm stroke, G1/4 port (PT/G/NPT threads), and mounting accessory. Since this SKU lacks an -S magnet, it cannot take CS1-B/DS1-B sensors; order SAI50X380S if sensing is needed. Neighbouring bores are 40mm (628N push @0.5MPa) and 63mm (1559N). The 380mm stroke requires external guides to prevent rod bending under side loads. For load holding on air loss, use an external pilot check valve or the SAIL/BSAI lock variants, as cushions only decelerate.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X380
- ✓ 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 SI50X380 FAQ
Yes, the SI50X380 is discontinued. The direct replacement is the SAI50X380, a true ISO 15552 profile cylinder with the same 50mm bore, 380mm stroke, output force, G1/4 port and mounting dimensions.
It features a 20mm rod, M16x1.5 thread, 30mm cushions, and operates at 30-800mm/s. Force ratings are 982N push / 825N pull @0.5MPa, 1374N push @0.7MPa, 1767N @0.9MPa, and a 200kgf maximum @1.0MPa.
Request a Quote for the SAI50X380
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X380 replacement — usually within 7-8 hours.