This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50AX240, 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 SI50AX240
The AirTAC Airtac SI50 Standard Cylinder SI50AX240 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 240mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50AX240, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke240 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50AX240
- 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 SI50AX240
The AirTAC SI50AX240 is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 240mm stroke. It delivers 982N push and 825N pull at 0.5MPa via a G1/4 port. The direct replacement is the SAI50AX240, matching the interface, force, and mounting exactly.
This SKU features a SUS420J2 stainless piston rod but lacks a magnet, so it cannot accept position switches. The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure. For load holding, note the cushion only decelerates; use an external rod lock or SAIL variant.
Airtac SI50 Standard Cylinder SI50AX240 Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50AX240 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50AX240 |
| Bore size | Ø50 mm |
| Stroke | 240 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 SAI50AX240 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 SAI50AX240 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 SI50AX240
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×240 | 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 SI50AX240 Is Used
Diverting Mechanisms
Actuates routing gates on packaging lines using the 982N push force, with the SUS420J2 stainless rod resisting washdown moisture.
Clamping Jigs
Secures aluminium extrusions during machining operations, relying on the 825N pull force at 0.5MPa to maintain grip.
Replacing the Airtac SI50 Standard Cylinder SI50AX240 with the SAI50AX240
To replace the SI50AX240, order the SAI50AX240. Verify the ISO 15552 mounting interface, 50mm bore, 240mm stroke, and G1/4 port. Because this SKU lacks a magnet (-S), it cannot support sensors; if sensing is needed, specify an SAI50X240S. The standard carbon steel rod is substituted here with the SUS420J2 stainless option (-A) for corrosion resistance. At 0.5MPa it yields 982N push; sizing down, a 40mm bore gives 628N, while an 80mm bore yields 2513N. For load holding on air loss, the cushion only decelerates; add a pilot check valve or consider the SAIL lock variant. Since the 240mm stroke exceeds 300mm? No, but always ensure guide support to prevent rod bending under side loads.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50AX240
- ✓ 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 SI50AX240 FAQ
Yes, the SI50AX240 is discontinued. The direct replacement is the SAI50AX240. It is dimensionally interchangeable per ISO 15552, retaining the same 50mm bore, 240mm stroke, G1/4 port, and mounting interface.
This double-acting cylinder has a 50mm bore, 240mm stroke, M16x1.5 rod thread, 30mm cushion, and operates at 30-800 mm/s. Force output is 982N push / 825N pull at 0.5MPa, 1374N push at 0.7MPa, and a theoretical max of 200kgf at 1.0MPa. It uses a G1/4 port.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50AX240
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50AX240 replacement — usually within 7-8 hours.