This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50BX260, 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 SI50BX260
The AirTAC Airtac SI50 Standard Cylinder SI50BX260 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 260mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50BX260, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke260 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50BX260
- 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 SI50BX260
The AirTAC SI50BX260 is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 260mm stroke. Delivering 982N push force at 0.5MPa via a G1/4 port, it is replaced by the SAI50BX260. This direct successor matches the exact interface, stroke and force, fitting existing fixtures perfectly.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. This SKU has a SUS304 stainless rod (-B) and no magnet, so it cannot take a sensor. For high heat, Viton H seals raise the temperature limit to 150C.
Airtac SI50 Standard Cylinder SI50BX260 Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50BX260 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50BX260 |
| Bore size | Ø50 mm |
| Stroke | 260 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 SAI50BX260 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 SAI50BX260 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 SI50BX260
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×260 | 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 SI50BX260 Is Used
Stainless Rod Actuation
The SUS304 piston rod excels in mildly corrosive washdown environments, driving clamps and stops where standard carbon steel would pit or degrade.
Mid-Stroke Diverting
With a 260mm stroke, it pushes packages between parallel conveyor lanes, using the 982N thrust to reposition heavy goods smoothly.
Replacing the Airtac SI50 Standard Cylinder SI50BX260 with the SAI50BX260
To replace the SI50BX260, order the SAI50BX260. Confirm the ISO 15552 mounting interface, G1/4 port, M16x1.5 rod thread and 260mm stroke. Because this SKU lacks a magnet (-S), it cannot accept CS1-B/DS1-B sensors; order a magnet-equipped SAI if position detection is needed. Sizing down, a 40mm bore yields 628N at 0.5MPa; sizing up, a 63mm bore provides 1559N. At 260mm stroke, use a guide to prevent rod bending and side-load wear. A plain cylinder drifts on air loss—the cushion only decelerates—so use an external rod lock or pilot check valve for load holding, or specify the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50BX260
- ✓ 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 SI50BX260 FAQ
Yes, the SI50BX260 is discontinued. The direct replacement is the SAI50BX260. It is dimensionally interchangeable per ISO 15552, retaining the same 50mm bore, 260mm stroke, G1/4 port, and mounting interface, so it drops directly into existing fixtures.
The bore is 50mm with a G1/4 air port. The thrust is 982N push and 825N pull at 0.5MPa, 1374N push at 0.7MPa, and 1767N push at 0.9MPa. The theoretical maximum force is 200kgf at 1.0MPa. Operating speed is 30-800mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50BX260
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50BX260 replacement — usually within 7-8 hours.