This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X750, 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 SI50X750
The AirTAC Airtac SI50 Standard Cylinder SI50X750 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 750mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X750, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke750 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X750
- 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 SI50X750
The AirTAC SI50X750 is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 750mm stroke. Delivering 982N push force at 0.5MPa via a G1/4 port, it is replaced by the direct replacement SAI50X750. This upgrade matches the exact ISO 15552 mounting interface, bore, stroke, force and port, fitting existing fixtures perfectly.
The SAI50X750 features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life. This SKU lacks a magnet, so it cannot take a sensor. The SAI family also adds SAIL, SAIF and BSAI lock variants the SI lacked.
Airtac SI50 Standard Cylinder SI50X750 Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X750 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X750 |
| Bore size | Ø50 mm |
| Stroke | 750 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 SAI50X750 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 SAI50X750 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 SI50X750
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×750 | 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 SI50X750 Is Used
Long-Stroke Diversion
Actuates routing gates on packaging lines, using the 750mm stroke to shift products between parallel conveyor belts smoothly.
Vertical Material Lift
Raises light pallets or totes up to 50kg in mezzanine lifts, safely operating within the 982N push force limit at 0.5MPa.
Tooling Ejection
Pushes machined parts out of a fixture at 0.7MPa (1374N), clearing the workspace for the next automated cycle.
Replacing the Airtac SI50 Standard Cylinder SI50X750 with the SAI50X750
To replace the SI50X750, order the SAI50X750. Confirm the ISO 15552 mounting interface (LB, FA, CA, TC), the G1/4 port, and the 750mm stroke. Because this is a non-magnet SKU, it cannot accept position sensors; if sensing is needed, specify an SAI50X750S. For load holding, note that a plain cylinder drifts on air loss—the cushion only decelerates—so use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant. With a 750mm stroke, use external guides to prevent rod bending and side loads. Sizing both ways: the 40mm bore yields 628N [email protected], while the 63mm bore yields 1559N.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X750
- ✓ 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 SI50X750 FAQ
Yes, the AirTAC SI50X750 is discontinued. The direct replacement is the SAI50X750. It is dimensionally interchangeable per ISO 15552, matching the 50mm bore, 750mm stroke, 982N force, G1/4 port, and mounting accessories.
The 50mm bore features a G1/4 air port and a 20mm rod. Force output is 982N push and 825N pull at 0.5MPa, 1374N push at 0.7MPa, 1767N push at 0.9MPa, and a theoretical max of 200kgf at 1.0MPa.
Request a Quote for the SAI50X750
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X750 replacement — usually within 7-8 hours.