This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X260S, 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 SI50X260S
The AirTAC Airtac SI50 Standard Cylinder SI50X260S 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 SAI50X260S, 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 → SAI50X260S
- 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 SI50X260S
The AirTAC SI50X260S is a discontinued double-acting ISO 15552 profile cylinder with a 50 mm bore and 260 mm stroke. It delivers 982 N push force at 0.5 MPa through a G1/4 port. AirTAC replaced this legacy unit with the SAI50X260S, a direct replacement retaining the exact ISO 15552 mounting interface, bore, stroke, output force, port size and mounting accessories.
The SAI upgrade features a modernized piston seal using two Y-shaped one-way elements for low start-up pressure and extended life. This -S model includes a piston magnet for legacy CS1-B/DS1-B sensors, while the SAI family also introduces SAIL, SAIF and BSAI lock or valve variants the SI lacked.
Airtac SI50 Standard Cylinder SI50X260S Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X260S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X260S |
| 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 SAI50X260S 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 SAI50X260S 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 SI50X260S
| 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 SI50X260S Is Used
Package Diverting
Actuates diverting gates on packaging lines where the 982 N push force easily redirects moderate weight cartons at speed.
Pallet Stop Arms
Controls pallet flow on roller conveyors, using the 260 mm stroke to deploy stopping arms safely into the物流 path.
Replacing the Airtac SI50 Standard Cylinder SI50X260S with the SAI50X260S
To replace the SI50X260S, order the SAI50X260S and verify your ISO 15552 mounting interface, G1/4 port thread (PT/G/NPT), M16x1.5 rod thread and mounting accessory (LB, FA, TC, etc.). The -S denotes a magnet for position sensing, so confirm current AirTAC switches if upgrading from legacy CS1-B/DS1-B sensors. Sizing both ways: the 50 mm bore gives 982 N push at 0.5 MPa, while the neighboring 40 mm bore offers 628 N and the 63 mm bore provides 1559 N. Because the 260 mm stroke exceeds 300 mm is false here, but always ensure adequate guide support to prevent rod bending under side loads. A plain cylinder does not hold load on air loss; the cushion only decelerates. For load holding, use an external pilot check valve, rod lock, or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X260S
- ✓ 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 SI50X260S FAQ
Yes, the SI50X260S is discontinued. The direct replacement is the SAI50X260S. It shares the identical ISO 15552 mounting interface, 50 mm bore, 260 mm stroke, output force, G1/4 port and mounting accessories, fitting directly into existing fixtures.
This double-acting cylinder uses a G1/4 air port. It delivers 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 maximum force of 200 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50X260S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X260S replacement — usually within 7-8 hours.