This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50AX65, 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 SI50AX65
The AirTAC Airtac SI50 Standard Cylinder SI50AX65 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 65mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50AX65, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke65 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50AX65
- 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 SI50AX65
The AirTAC SI50AX65 is a discontinued double-acting ISO 15552 profile cylinder with a 50 mm bore and 65 mm stroke. It delivers 982 N push force at 0.5 MPa via a G1/4 port. The direct replacement is the SAI50AX65, which matches the interface, bore, stroke, force, and mounting.
This SKU features a SUS420J2 stainless steel piston rod (-A) for corrosion resistance but lacks a magnet, meaning it cannot accept a CS1-B/DS1-B sensor. The SAI upgrade uses two Y-shaped one-way piston seals for low start-up pressure.
Airtac SI50 Standard Cylinder SI50AX65 Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50AX65 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50AX65 |
| Bore size | Ø50 mm |
| Stroke | 65 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 SAI50AX65 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 SAI50AX65 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 SI50AX65
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×65 | 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 SI50AX65 Is Used
Corrosive Clamping
Ideal for fixture clamping in washdown environments thanks to the SUS420J2 stainless piston rod, delivering 982 N of secure holding force.
Short-Stroke Diverting
Provides reliable 65 mm actuation for routing lightweight packages on processing lines without occupying excessive machine footprint.
Replacing the Airtac SI50 Standard Cylinder SI50AX65 with the SAI50AX65
To replace the SI50AX65, order the SAI50AX65. Confirm the ISO 15552 mounting interface, 65 mm stroke, G1/4 port, and your specific mounting accessory. Because this is a no-magnet SKU, it cannot support position sensing; if you need switches, specify the SAI equivalent with an S suffix for current AirTAC sensor compatibility. The 50 mm bore yields 982 N push at 0.5 MPa; if less force is needed, step down to a 40 mm bore (628 N), or step up to 63 mm (1559 N) for heavier loads. Note that a plain cylinder drifts on air loss—the cushion only decelerates. For load holding, use an external pilot check valve or explore the SAIL or BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50AX65
- ✓ 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 SI50AX65 FAQ
Yes, the SI50AX65 is discontinued. The direct replacement is the SAI50AX65. It is dimensionally interchangeable per ISO 15552, retaining the exact same 50 mm bore, 65 mm stroke, force, and G1/4 port to fit existing fixtures perfectly.
This double-acting cylinder has a 50 mm bore, 65 mm stroke, G1/4 port, M16x1.5 rod thread, and 30 mm cushions. Force ratings are 982 N push / 825 N pull at 0.5 MPa, 1374 N push at 0.7 MPa, and a theoretical max of 200 kgf at 1.0 MPa. This no-magnet SKU cannot accept sensors.
Request a Quote for the SAI50AX65
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50AX65 replacement — usually within 7-8 hours.