This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X360S, 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 SI50X360S
The AirTAC SI50 Standard Cylinder SI50X360S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 360mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X360S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke360 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X360S
- 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 SI50X360S
The AirTAC SI50X360S is a discontinued double-acting ISO 15552 profile cylinder with a 50 mm bore and 360 mm stroke. It delivers 982 N push and 825 N pull at 0.5 MPa through a G1/4 port. AirTAC replaced this legacy unit with the SAI50X360S, a direct upgrade sharing the exact ISO 15552 mounting interface, bore, stroke, force and port size.
The SAI replacement features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life. The SAI family also adds SAIL, SAIF and BSAI lock variants the SI lacked. Your -S suffix means a piston magnet for CS1-B/DS1-B sensors.
Airtac SI50 Standard Cylinder SI50X360S Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X360S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X360S |
| Bore size | Ø50 mm |
| Stroke | 360 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 SAI50X360S 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 SAI50X360S 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 SI50X360S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×360 | 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 SI50X360S Is Used
Package Diverting
Actuates routing gates on packaging lines, utilizing the 982 N push force to redirect heavy cartons reliably at speed.
Pallet Handling
Provides the 360 mm stroke needed to push pallets onto accumulation zones without requiring external extensions.
Replacing the Airtac SI50 Standard Cylinder SI50X360S with the SAI50X360S
To replace this SI50X360S with the SAI50X360S, verify the ISO 15552 mounting interface, 50 mm bore, 360 mm stroke, G1/4 port (PT/G/NPT) and your mounting accessory. Because the stroke is 360 mm, use external guides to prevent rod bending and side loads. Size both ways: a 63 mm bore gives 1559 N push at 0.5 MPa, while a 40 mm bore yields 628 N. A plain cylinder drifts on air loss as the cushion only decelerates; for load holding use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X360S
- ✓ 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 SI50X360S FAQ
Yes, the SI50X360S is discontinued. The direct replacement is the SAI50X360S. It shares the same ISO 15552 mounting interface, 50 mm bore, 360 mm stroke, output force and G1/4 port, fitting existing fixtures perfectly.
The 50 mm bore uses a G1/4 port. 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. It features a 20 mm rod and M16x1.5 thread.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50X360S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X360S replacement — usually within 7-8 hours.