This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50BX165S, 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 SI50BX165S
The AirTAC Airtac SI50 Standard Cylinder SI50BX165S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 165mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50BX165S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke165 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50BX165S
- 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 SI50BX165S
The AirTAC SI50BX165S is a discontinued double-acting ISO 15552 profile cylinder featuring a 50mm bore, 165mm stroke, and a SUS304 stainless piston rod. Generating 982N push force at 0.5MPa via a G1/4 port, it is replaced by the SAI50BX165S. This direct successor matches the exact ISO 15552 mounting interface, bore, stroke, and force.
The SAI upgrade utilizes two Y-shaped one-way piston seals for low start-up pressure and extended life. Note that 165mm is a non-standard stroke. The -S magnet supports legacy CS1-B/DS1-B sensors, while the SAI family introduces SAIL lock, SAIF valve, and BSAI clamp variants.
Airtac SI50 Standard Cylinder SI50BX165S Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50BX165S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50BX165S |
| Bore size | Ø50 mm |
| Stroke | 165 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 SAI50BX165S 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 SAI50BX165S 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 SI50BX165S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×165 | 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 SI50BX165S Is Used
Palletized Gate Control
Actuates heavy access gates on distribution centers, benefiting from the direct SAI replacement compatibility.
Replacing the Airtac SI50 Standard Cylinder SI50BX165S with the SAI50BX165S
To replace the SI50BX165S, order the SAI50BX165S, confirming the ISO 15552 interface, G1/4 port, M16x1.5 rod thread, and the -S magnet for current AirTAC switches. If downsizing, the 40mm bore yields 628N push at 0.5MPa; if upsizing, the 63mm bore provides 1559N. Remember that a plain cylinder drifts without live air—the cushion only decelerates. For load holding, use an external pilot check valve or the SAIL/BSAI lock variant. Because 165mm is non-standard and under 300mm, standard side-load guides apply.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50BX165S
- ✓ 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 SI50BX165S FAQ
Yes, the SI50BX165S is discontinued. The direct replacement is the SAI50BX165S. It shares the identical ISO 15552 mounting interface, 50mm bore, 165mm stroke, G1/4 port, and output force, fitting existing fixtures perfectly.
The G1/4 port bore delivers a push force of 982N and a pull force of 825N at 0.5MPa. At 0.7MPa it pushes 1374N, and the theoretical maximum force is 200kgf at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50BX165S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50BX165S replacement — usually within 7-8 hours.