This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X380S, 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 SI50X380S
The AirTAC Airtac SI50 Standard Cylinder SI50X380S 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 SAI50X380S, 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 → SAI50X380S
- 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 SI50X380S
The AirTAC SI50X380S is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 380mm stroke, delivering 982N push force at 0.5MPa via a G1/4 port. AirTAC replaced this legacy unit with the SAI50X380S, a direct replacement retaining the exact ISO 15552 mounting interface, M16x1.5 rod thread, and 30mm cushions.
The SAI upgrade features a modernized piston seal with two Y-shaped one-way elements for low start-up pressure and extended life. If high temperatures up to 150C are needed, Viton H seals are available, and the built-in magnet supports CS1-B/DS1-B switches.
Airtac SI50 Standard Cylinder SI50X380S Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X380S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X380S |
| 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 SAI50X380S 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 SAI50X380S 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 SI50X380S
| 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 SI50X380S Is Used
Package Diversion
Drives a 380mm stroke routing gate on a packaging line, using the 982N push force to deflect heavy cartons at high speed.
Long-Reach Clamping
Extends 380mm to secure large workpieces inside a machining fixture, relying on the ISO 15552 profile barrel for rigid alignment.
Replacing the Airtac SI50 Standard Cylinder SI50X380S with the SAI50X380S
To replace the SI50X380S, order the SAI50X380S and confirm the ISO 15552 mounting accessory (LB, FA, TC, etc.), the G1/4 port thread (PT/G/NPT), and the -S magnet for legacy CS1-B/DS1-B sensors. For sizing both ways: the 50mm bore yields 982N push at 0.5MPa, while the neighboring 40mm bore provides 628N and the 63mm bore offers 1559N. Because the 380mm stroke is long, use an external guide to prevent rod bending and side-load damage. 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 for load holding.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X380S
- ✓ 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 SI50X380S FAQ
Yes, the SI50X380S is discontinued. The direct replacement is the SAI50X380S. It shares the identical ISO 15552 mounting interface, 50mm bore, 380mm stroke, G1/4 port, and output force, fitting existing fixtures perfectly.
This 50mm bore cylinder features a G1/4 air port and provides 982N push / 825N pull at 0.5MPa, 1374N push at 0.7MPa, 1767N at 0.9MPa, and a theoretical maximum of 200kgf at 1.0MPa. The 380mm stroke operates at 30-800mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50X380S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X380S replacement — usually within 7-8 hours.