This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50AX260S, 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 SI50AX260S
The AirTAC Airtac SI50 Standard Cylinder SI50AX260S 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 SAI50AX260S, 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 → SAI50AX260S
- 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 SI50AX260S
The AirTAC SI50AX260S is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 260mm stroke. Featuring a SUS420J2 stainless piston rod, it delivers 982 N push force at 0.5 MPa via a G1/4 port. AirTAC replaced this legacy unit with the SAI50AX260S, a direct upgrade retaining the exact interface, bore, stroke, force and mounting.
The SAI replacement features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and extended life. It also adds SAIL, SAIF and BSAI lock variants absent in the SI line. The original -S magnet supports legacy CS1-B/DS1-B sensors.
Airtac SI50 Standard Cylinder SI50AX260S Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50AX260S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50AX260S |
| 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 SAI50AX260S 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 SAI50AX260S 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 SI50AX260S
| 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 SI50AX260S Is Used
Diverting Gate Actuation
Drives routing flaps on packaging lines where the 982 N push force at 0.5 MPa easily overcomes flap friction and product deflection loads.
Light Press Assembly
Pushes small bearings into housings; the SUS420J2 stainless rod resists moisture in washdown areas while the 260mm stroke provides ample reach.
Replacing the Airtac SI50 Standard Cylinder SI50AX260S with the SAI50AX260S
To replace the SI50AX260S, order the SAI50AX260S. Confirm the ISO 15552 mounting interface, 50mm bore, 260mm stroke, G1/4 port (PT/G/NPT thread), and mounting accessory. The -S magnet and SUS420J2 rod (-A) must be specified. Sizing both ways: a 40mm bore yields 628 N push at 0.5 MPa, while a 63mm bore yields 1559 N. Note that a plain cylinder drifts on air loss; the air cushion only decelerates. For load holding, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant. At 260mm stroke, ensure guide alignment to prevent rod bending and side-load wear.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50AX260S
- ✓ 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 SI50AX260S FAQ
Yes, the SI50AX260S is discontinued. The direct replacement is the SAI50AX260S. It is dimensionally interchangeable per ISO 15552, matching the 50mm bore, 260mm stroke, G1/4 port, force, and mounting fixtures exactly.
The 50mm bore uses a G1/4 air port. Force ratings are: 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 of 200 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50AX260S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50AX260S replacement — usually within 7-8 hours.