This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50AX475, 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 SI50AX475
The AirTAC Airtac SI50 Standard Cylinder SI50AX475 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 475mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50AX475, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke475 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50AX475
- 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 SI50AX475
The AirTAC SI50AX475 is a discontinued double-acting ISO 15552 profile cylinder featuring a 50mm bore, 475mm stroke, and a SUS420J2 stainless piston rod. Delivering 982N push force at 0.5MPa, it is replaced by the SAI50AX475. This direct successor shares the exact G1/4 port, M16x1.5 thread, and ISO 15552 mounting interface, fitting existing fixtures perfectly.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and long life. Without a magnet, this SKU cannot take a sensor. The SAI family adds SAIL, SAIF, and BSAI variants.
Airtac SI50 Standard Cylinder SI50AX475 Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50AX475 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50AX475 |
| Bore size | Ø50 mm |
| Stroke | 475 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 SAI50AX475 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 SAI50AX475 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 SI50AX475
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×475 | 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 SI50AX475 Is Used
Diverting Mechanisms
Drives routing gates on packaging lines, utilizing the 982N push force to reliably pivot heavy product flows.
Vertical Lift Stops
Raises 50kg pallet stops in low-pressure pneumatics, where the 475mm stroke provides ample clearance for forklift entry.
Corrosive Test Chambers
Actuates sample trays inside humid or mildly corrosive environments, leveraging the SUS420J2 stainless rod option.
Replacing the Airtac SI50 Standard Cylinder SI50AX475 with the SAI50AX475
To replace the SI50AX475, order the SAI50AX475, confirming the ISO 15552 mounting accessory (LB, FA, TC, etc.), the G1/4 port, and the SUS420J2 rod. Since this is a non-magnet SKU, it cannot accept a CS1-B or DS1-B switch; order a magnet-equipped SAI if sensing is needed. For load holding, note that a plain cylinder drifts on air loss—the cushion only decelerates—so use an external rod lock or pilot check valve. At 475mm stroke, prevent rod bending by using external guides to manage side loads. Sizing both ways: the 50mm bore yields 982N push at 0.5MPa, while the neighboring 40mm bore yields 628N.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50AX475
- ✓ 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 SI50AX475 FAQ
Yes, the SI50AX475 is discontinued. The direct replacement is the SAI50AX475. It features the same ISO 15552 mounting interface, 50mm bore, 475mm stroke, force, and G1/4 port, fitting existing fixtures perfectly.
It features a G1/4 air port. Theoretical forces are 982N push and 825N pull at 0.5MPa, 1374N push at 0.7MPa, and a maximum force of 200 kgf at 1.0 MPa. The rod is Ø20mm with an M16x1.5 thread.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50AX475
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50AX475 replacement — usually within 7-8 hours.