This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X526, 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 SI50X526
The AirTAC SI50 Standard Cylinder SI50X526 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 526mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X526, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke526 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X526
- 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 SI50X526
The AirTAC SI50X526 is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 526mm stroke. Delivering 982N push force at 0.5MPa via a G1/4 port, it is replaced by the SAI50X526. This direct successor matches the exact interface, stroke and force, fitting existing fixtures seamlessly.
The SAI upgrade features two Y-shaped one-way piston seals for low start-up pressure and long life. Note this no-S SKU cannot take a sensor (unlike CS1-B/DS1-B legacy switches); for load holding use SAIL or BSAI lock variants.
Airtac SI50 Standard Cylinder SI50X526 Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X526 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X526 |
| Bore size | Ø50 mm |
| Stroke | 526 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 SAI50X526 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 SAI50X526 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 SI50X526
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×526 | 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 SI50X526 Is Used
Long-Stroke Diversion
Pushes packages across a 526mm lane shift using the 982N push force at 0.5MPa, requiring external guides to prevent rod bending.
Mid-Force Ejection
Ejects machined aluminium parts from a fixture, utilizing the 825N pull force at 0.5MPa for reliable retraction.
Replacing the Airtac SI50 Standard Cylinder SI50X526 with the SAI50X526
To replace the SI50X526, order the SAI50X526. Verify the ISO 15552 mounting interface, 526mm stroke, G1/4 port (PT/G/NPT) and M16x1.5 rod thread. This no-magnet SKU cannot accept a sensor. For sizing, the 50mm bore yields 982N push at 0.5MPa; step down to 40mm for 628N or up to 63mm for 1559N. Because stroke is 526mm, use external guides to prevent rod bending and side loads. The air cushion only decelerates; for load holding on air loss, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X526
- ✓ 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 SI50X526 FAQ
Yes, the SI50X526 is discontinued. The direct replacement is the SAI50X526. It is dimensionally interchangeable per ISO 15552, retaining the same 50mm bore, 526mm stroke, 982N force, G1/4 port and mounting interface.
The G1/4 port bore 50mm cylinder delivers 982N push and 825N pull at 0.5MPa, 1374N push at 0.7MPa, and a theoretical max of 200 kgf at 1.0MPa. It operates at 30-800 mm/s with a 30mm adjustable air cushion.
Request a Quote for the SAI50X526
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X526 replacement — usually within 7-8 hours.