This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50BX240, 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 SI50BX240
The AirTAC Airtac SI50 Standard Cylinder SI50BX240 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 SAI50BX240, 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 → SAI50BX240
- 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 SI50BX240
The AirTAC SI50BX240 is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 240mm stroke. It delivers 982 N push force at 0.5 MPa via a G1/4 port. The direct replacement is the SAI50BX240, matching the exact bore, stroke, force, port, and ISO 15552 mounting interface.
This SKU features a SUS304 stainless steel rod (-B) but lacks a magnet, meaning it cannot accept position sensors. The SAI upgrade uses two Y-shaped one-way piston seals for low start-up pressure.
Airtac SI50 Standard Cylinder SI50BX240 Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50BX240 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50BX240 |
| 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 SAI50BX240 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 SAI50BX240 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 SI50BX240
| 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 SI50BX240 Is Used
Product Diversion
Actuates routing gates on packaging lines, utilizing the 982 N push force to smoothly deflect heavy cartons at 240 mm stroke.
Pallet Stopper
Functions as a pneumatic stop for inbound pallets, where the SUS304 stainless rod provides corrosion resistance in humid loading docks.
Replacing the Airtac SI50 Standard Cylinder SI50BX240 with the SAI50BX240
To replace the SI50BX240, order the SAI50BX240. Verify your ISO 15552 mounting fixture (LB, FA, TC, etc.), the G1/4 air port, and the M16x1.5 rod thread. Because this SKU lacks a magnet (-S), it cannot support CS1-B/DS1-B sensors; order a magnet-equipped SAI if position feedback is needed. At 240 mm stroke, side-load risks are moderate, so guide the load to prevent rod bending. The 50mm bore yields 982 N push at 0.5 MPa; if undersized, the 63mm bore offers 1559 N. Note that a plain cylinder drifts on air loss—the cushion only decelerates. For load holding, use an external pilot check valve or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50BX240
- ✓ 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 SI50BX240 FAQ
Yes, the SI50BX240 is discontinued. The direct replacement is the SAI50BX240. It features the same ISO 15552 mounting interface, 50mm bore, 240mm stroke, output force, and G1/4 port, fitting existing fixtures perfectly.
This double-acting cylinder uses a G1/4 port. It generates 982 N push and 825 N pull at 0.5 MPa, 1374 N push at 0.7 MPa, and 1767 N push at 0.9 MPa. The theoretical maximum force is 200 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50BX240
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50BX240 replacement — usually within 7-8 hours.