This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50BX170S, 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 SI50BX170S
The AirTAC Airtac SI50 Standard Cylinder SI50BX170S 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 SAI50BX170S, 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 → SAI50BX170S
- 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 SI50BX170S
The AirTAC SI50BX170S is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore, 170mm stroke, and a SUS304 stainless steel rod. Generating 982 N push force at 0.5 MPa, it is replaced by the SAI50BX170S. This direct upgrade keeps the same G1/4 port, M16x1.5 thread, and mounting interface, fitting existing fixtures perfectly.
The SAI features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life. The original -S magnet works with legacy CS1-B/DS1-B sensors, while the SAI family adds SAIL lock, SAIF valve, and BSAI clamp-lock variants the SI lacked.
Airtac SI50 Standard Cylinder SI50BX170S Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50BX170S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50BX170S |
| 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 SAI50BX170S 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 SAI50BX170S 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 SI50BX170S
| 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 SI50BX170S Is Used
Stainless Rod Clamping
Ideal for packaging machinery requiring corrosion resistance, using the SUS304 rod to clamp components with 982 N of force at 0.5 MPa.
Material Diversion
Actuates diverters on 50mm bore conveyors, providing reliable 170mm stroke movement for sorting goods at speeds up to 800 mm/s.
Replacing the Airtac SI50 Standard Cylinder SI50BX170S with the SAI50BX170S
To replace the SI50BX170S, order the SAI50BX170S. Confirm the ISO 15552 mounting interface, 50mm bore, 170mm stroke, G1/4 port, and your specific mounting accessory. The -B rod is SUS304 stainless steel, and the -S magnet supports legacy CS1-B/DS1-B switches (SAI uses current AirTAC switches). Size both ways: step down to a 40mm bore (628 N push @0.5 MPa) or up to a 63mm bore (1559 N push @0.5 MPa). A plain cylinder drifts on air loss; the cushion only decelerates. For load holding, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variants. At 170mm stroke, side-load is minimal, but ensure straight alignment to prevent rod bending.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50BX170S
- ✓ 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 SI50BX170S FAQ
Yes, the SI50BX170S is discontinued. The direct replacement is the SAI50BX170S. It is dimensionally interchangeable per ISO 15552, retaining the same 50mm bore, 170mm stroke, G1/4 port, and mounting interface.
The 50mm bore features a G1/4 port. Force ratings are: 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 max of 200 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50BX170S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50BX170S replacement — usually within 7-8 hours.