This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50BX180, 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 SI50BX180
The AirTAC Airtac SI50 Standard Cylinder SI50BX180 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 180mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50BX180, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke180 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50BX180
- 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 SI50BX180
The AirTAC SI50BX180 is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 180mm stroke. It delivers 982 N push force at 0.5 MPa via a G1/4 port. The direct replacement is the SAI50BX180, matching the exact interface, force, and mounting.
This SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. Note this SKU lacks a magnet, so it cannot take a CS1-B/DS1-B sensor.
Airtac SI50 Standard Cylinder SI50BX180 Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50BX180 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50BX180 |
| Bore size | Ø50 mm |
| Stroke | 180 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 SAI50BX180 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 SAI50BX180 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 SI50BX180
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×180 | 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 SI50BX180 Is Used
Mid-Force Clamping
Secures workholding fixtures in CNC machining, using the 982 N push force at 0.5 MPa to lock aluminium and steel components firmly during milling operations.
Package Diversion
Drives sorting pop-up arms on packaging lines, where the 180mm stroke provides adequate travel to redirect parcels without excessive cycle time.
Replacing the Airtac SI50 Standard Cylinder SI50BX180 with the SAI50BX180
To replace the SI50BX180, order the SAI50BX180. Verify the ISO 15552 mounting interface, 180mm stroke, G1/4 port, and M16x1.5 rod thread. Because this specific SKU has no magnet (-S), it cannot support position sensing; order a magnet-equipped SAI if switches are needed. For sizing, a neighbouring 40mm bore yields 628 N push at 0.5 MPa, while a 63mm bore provides 1559 N. A plain cylinder does not hold load without live air—the cushion only decelerates—so use an external pilot check valve or the SAIL lock variant for hold requirements.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50BX180
- ✓ 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 SI50BX180 FAQ
Yes, the AirTAC SI50BX180 is discontinued. The direct replacement is the SAI50BX180. It is dimensionally interchangeable per ISO 15552, retaining the same 50mm bore, 180mm stroke, G1/4 port, and mounting accessories.
The bore is 50mm with a G1/4 air port. Force output is 982 N push and 825 N pull at 0.5 MPa, 1374 N push at 0.7 MPa, 1767 N push at 0.9 MPa, and a theoretical maximum of 200 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50BX180
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50BX180 replacement — usually within 7-8 hours.