This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50BX750, 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 SI50BX750
The AirTAC Airtac SI50 Standard Cylinder SI50BX750 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 SAI50BX750, 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 → SAI50BX750
- 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 SI50BX750
The AirTAC SI50BX750 is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 750mm stroke. Delivering 982N push at 0.5MPa via a G1/4 port, it is replaced by the SAI50BX750. This direct upgrade shares the exact ISO 15552 mounting interface, bore, stroke, force, and port. The SAI features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life. Because this SKU lacks the -S magnet, it cannot accept a CS1-B/DS1-B sensor. The -B rod is SUS304 stainless steel, and a Viton H seal option raises the temperature limit to 150C.
The SAI family also introduces SAIL, SAIF, and BSAI lock or valve variants absent in the SI line.
Airtac SI50 Standard Cylinder SI50BX750 Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50BX750 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50BX750 |
| 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 SAI50BX750 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 SAI50BX750 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 SI50BX750
| 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 SI50BX750 Is Used
Long-Stroke Diversion
Pushes packages across transfer lines using the full 750mm extension, relying on the 982N force to overcome guide friction.
Vertical Material Lift
Raises 50kg platforms through 750mm of travel, requiring external guidance to prevent rod bending on the long stroke.
Stainless Rod Actuation
Drives tooling stages in humid washdown environments using the SUS304 rod, with the G1/4 port managing air flow.
Replacing the Airtac SI50 Standard Cylinder SI50BX750 with the SAI50BX750
To replace the SI50BX750, order the SAI50BX750 direct. Confirm the ISO 15552 mounting interface, 50mm bore, 750mm stroke, G1/4 port, and SUS304 stainless rod (-B). This SKU has no magnet, so it cannot support position sensing; add the -S suffix if switches are needed. Sizing both ways: a 40mm bore yields 628N push, while a 63mm bore yields 1559N at 0.5MPa. For load holding, note that a plain cylinder drifts on air loss—the cushion only decelerates—so use an external rod lock or pilot check valve, or specify a SAIL/BSAI lock variant. At 750mm stroke, prevent rod bending by guiding the load externally to avoid side-load damage.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50BX750
- ✓ 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 SI50BX750 FAQ
Yes, the SI50BX750 is discontinued. The direct replacement is the SAI50BX750, which shares the same ISO 15552 mounting interface, 50mm bore, 750mm stroke, force, and G1/4 port.
It features a G1/4 port, a 20mm rod, and an M16x1.5 thread. Forces are 982N push and 825N pull at 0.5MPa, 1374N push at 0.7MPa, 1767N push at 0.9MPa, and a 200kgf maximum at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50BX750
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50BX750 replacement — usually within 7-8 hours.