This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50BX175, 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 SI50BX175
The AirTAC Airtac SI50 Standard Cylinder SI50BX175 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 175mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50BX175, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke175 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50BX175
- 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 SI50BX175
The AirTAC SI50BX175 is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 175mm stroke. It delivers 982N push force at 0.5MPa through a G1/4 port. The direct replacement is the SAI50BX175, matching the exact ISO 15552 mounting interface, stroke and output force.
This SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and long life. The SI50BX175 uses a SUS304 stainless rod (B option) for corrosion resistance, but lacks a magnet, meaning it cannot accept a CS1-B or DS1-B sensor.
Airtac SI50 Standard Cylinder SI50BX175 Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50BX175 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50BX175 |
| Bore size | Ø50 mm |
| Stroke | 175 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 SAI50BX175 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 SAI50BX175 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 SI50BX175
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×175 | 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 SI50BX175 Is Used
Package Diverting
Drives diverter arms on packaging lines where the 982N push force easily redirects cartons without bounce.
Pallet Stopping
Acts as a pneumatic stop gate for lightweight pallets, using its 50kg vertical lift capacity to hold items securely.
Clamp Actuation
Moves stainless-steel clamping fingers in machining cells, benefiting from the SUS304 rod for corrosion resistance.
Replacing the Airtac SI50 Standard Cylinder SI50BX175 with the SAI50BX175
To replace the discontinued SI50BX175, order the SAI50BX175. Confirm the ISO 15552 mounting interface, the 175mm stroke, G1/4 port and your specific mounting accessory (LB, FA, TC, etc.). This SKU lacks a magnet (-S), so it cannot support position sensing; if you need switches, select an SAI model with the S suffix for current AirTAC sensors. The 50mm bore yields 982N push at 0.5MPa; if undersized, the neighbouring 63mm bore provides 1559N. A plain cylinder drifts on air loss—the cushion only decelerates—so use an external pilot check valve or the SAIL/BSAI lock variant for held loads. Since the 175mm stroke is under 300mm, rod bending is minimal, but always guide the load to prevent side-loading.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50BX175
- ✓ 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 SI50BX175 FAQ
Yes, the SI50BX175 is discontinued. The direct replacement is the SAI50BX175. It is dimensionally interchangeable per ISO 15552, retaining the same 50mm bore, 175mm stroke, G1/4 port and mounting interface.
This double-acting cylinder has a G1/4 port. It generates 982N push and 825N pull at 0.5MPa, 1374N push at 0.7MPa, and a theoretical maximum of 200kgf at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50BX175
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50BX175 replacement — usually within 7-8 hours.