This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X260, 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 SI50X260
The AirTAC Airtac SI50 Standard Cylinder SI50X260 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 SAI50X260, 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 → SAI50X260
- 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 SI50X260
The AirTAC SI50X260 is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 260mm stroke. Delivering 982N push force at 0.5MPa through a G1/4 port, it is replaced by the SAI50X260. This direct successor matches the exact ISO 15552 mounting interface, bore, output force and cushioning.
The SAI upgrade features a modernized piston seal with two Y-shaped one-way elements for low start-up pressure and extended life. Note this specific SKU lacks a magnet (-S), so it cannot accept CS1-B/DS1-B sensors.
Airtac SI50 Standard Cylinder SI50X260 Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X260 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X260 |
| 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 SAI50X260 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 SAI50X260 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 SI50X260
| 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 SI50X260 Is Used
Package Diversion
Actuates routing gates on packaging lines where the 982N push force at 0.5MPa easily overcomes carton friction.
Pallet Stop Arms
Controls pallet flow on conveyors, using the 260mm stroke to deploy physical stops safely.
Replacing the Airtac SI50 Standard Cylinder SI50X260 with the SAI50X260
To replace the SI50X260, order the SAI50X260 direct: verify the ISO 15552 mounting interface, 260mm stroke, G1/4 port (PT/G/NPT thread options) and your specific mounting accessory (LB, FA, TC, etc.). Because this SKU lacks a magnet, you cannot mount position sensors; order an SAI50X260S if sensing is required. Sizing both ways: the 50mm bore yields 982N push at 0.5MPa, while the neighboring 63mm bore offers 1559N. For a 260mm stroke, ensure guide support to prevent rod bending and side-load wear. Plain cylinders drift on air loss; for load holding, use an external pilot check valve or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X260
- ✓ 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 SI50X260 FAQ
Yes, the SI50X260 is discontinued. The direct replacement is the SAI50X260, which shares the same ISO 15552 mounting interface, 50mm bore, 260mm stroke, G1/4 port and force ratings.
At 0.5MPa it provides 982N push and 825N pull. This rises to 1374N push at 0.7MPa and 1767N at 0.9MPa, with a theoretical max of 200kgf at 1.0MPa. Operating speed is 30-800mm/s.
Request a Quote for the SAI50X260
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X260 replacement — usually within 7-8 hours.