This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50BX170, 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 SI50BX170
The AirTAC Airtac SI50 Standard Cylinder SI50BX170 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 170mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50BX170, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke170 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50BX170
- 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 SI50BX170
The AirTAC SI50BX170 is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore, 170mm stroke, and a SUS304 stainless steel rod. Delivering 982N push force at 0.5MPa, it is replaced by the SAI50BX170 direct. This upgrade retains the exact G1/4 port, M16x1.5 thread, and mounting interface, while adding an upgraded two Y-shaped piston seal for low start-up pressure.
As a non-magnet SKU, it cannot accept a sensor. For load holding, the cushion only decelerates; use an external pilot check valve or the SAIL lock variant.
Airtac SI50 Standard Cylinder SI50BX170 Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50BX170 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50BX170 |
| Bore size | Ø50 mm |
| Stroke | 170 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 SAI50BX170 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 SAI50BX170 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 SI50BX170
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×170 | 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 SI50BX170 Is Used
Stainless Rod Clamping
Ideal for packaging machines requiring corrosion resistance, using the SUS304 rod to push 982N at 0.5 MPa.
Mid-Stroke Diverting
Provides 170mm travel to actuate diverters on material handling lines without needing full stroke extension.
Replacing the Airtac SI50 Standard Cylinder SI50BX170 with the SAI50BX170
To replace the SI50BX170, order the SAI50BX170 to get the exact ISO 15552 interface, 50mm bore, 170mm stroke, G1/4 port, and SUS304 rod. This non-magnet SKU cannot take a switch; if sensing is needed, use a magnet-equipped SAI. The cushion only decelerates; for held loads use a pilot check valve or the SAIL/BSAI lock variants. At 170mm stroke, side-load risk is low, but ensure guide alignment. For higher force, the 63mm bore offers 1559N at 0.5MPa; for less force, the 40mm bore gives 628N.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50BX170
- ✓ 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 SI50BX170 FAQ
Yes, the SI50BX170 is discontinued. The direct replacement is the SAI50BX170, which matches the ISO 15552 mounting interface, 50mm bore, 170mm stroke, force, and G1/4 port.
The G1/4 port bore delivers 982N push and 825N pull at 0.5 MPa, 1374N push at 0.7 MPa, 1767N push at 0.9 MPa, and a max force of 200 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50BX170
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50BX170 replacement — usually within 7-8 hours.