This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50AX260, 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 SI50AX260
The AirTAC Airtac SI50 Standard Cylinder SI50AX260 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 SAI50AX260, 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 → SAI50AX260
- 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 SI50AX260
The AirTAC SI50AX260 is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 260mm stroke. It delivers 982 N push and 825 N pull at 0.5 MPa through a G1/4 port. The direct replacement is the SAI50AX260, matching the interface, force, and mounting.
The SAI upgrade features two Y-shaped one-way piston seals for low start-up pressure. This SKU has no magnet (-S), so it cannot take a sensor. The -A rod is SUS420J2 stainless.
Airtac SI50 Standard Cylinder SI50AX260 Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50AX260 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50AX260 |
| 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 SAI50AX260 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 SAI50AX260 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 SI50AX260
| 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 SI50AX260 Is Used
Stainless Rod Clamping
Clamps aluminum parts in humid machining cells using the SUS420J2 rod to resist corrosion while delivering 982 N of push force at 0.5 MPa.
Package Diversion
Actuates a 260mm stroke routing gate on a packaging line, providing fast 30-800 mm/s cycling to redirect cartons without needing position sensing.
Replacing the Airtac SI50 Standard Cylinder SI50AX260 with the SAI50AX260
To replace the SI50AX260, order the SAI50AX260. Confirm the ISO 15552 mounting, 50mm bore, 260mm stroke, G1/4 port, and SUS420J2 stainless rod. Since this SKU lacks a magnet, it cannot accept CS1-B/DS1-B sensors. For a 260mm stroke, use a guide to prevent rod bending. The plain cylinder drifts on air loss; for load holding use the SAIL or BSAI lock variant, or an external pilot check valve. If sizing up, the 63mm bore offers 1559 N push at 0.5 MPa; if down, the 40mm gives 628 N.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50AX260
- ✓ 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 SI50AX260 FAQ
Yes, the SI50AX260 is discontinued. The direct replacement is the SAI50AX260. It is dimensionally interchangeable per ISO 15552, keeping the same 50mm bore, 260mm stroke, 982 N force, G1/4 port, and mounting fixtures.
The 50mm bore uses a G1/4 port. It provides 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 max of 200 kgf at 1.0 MPa. The rod is 20mm with an M16x1.5 thread.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50AX260
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50AX260 replacement — usually within 7-8 hours.