This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X160STC, 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 SI50X160STC
The AirTAC Airtac SI50 Standard Cylinder SI50X160STC is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 160mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X160STC, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke160 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X160STC
- 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 SI50X160STC
The AirTAC SI50X160STC is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 160mm stroke. Delivering 982N push force at 0.5MPa via a G1/4 port, it is replaced direct by the SAI50X160STC.
The SAI upgrade features two Y-shaped one-way piston seals for low start-up pressure. The SAI family adds SAIL and BSAI lock variants the SI lacked.
Airtac SI50 Standard Cylinder SI50X160STC Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X160STC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X160STC |
| Bore size | Ø50 mm |
| Stroke | 160 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 SAI50X160STC 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 SAI50X160STC 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 SI50X160STC
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×160 | 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 SI50X160STC Is Used
Package Diverting
Ideal for actuating routing gates on conveyor lines, using the 160mm stroke to shift parcels smoothly without overwhelming the 982N push force capacity.
Pallet Stopping
Deploys a physical stop block for low-inertia pallets entering a wrapping station, relying on the adjustable 30mm air cushions to absorb end-of-stroke impact.
Replacing the Airtac SI50 Standard Cylinder SI50X160STC with the SAI50X160STC
To replace the SI50X160STC, order the SAI50X160STC. Verify the ISO 15552 TC trunnion mount, 160mm stroke, G1/4 port, M16x1.5 rod thread, and the -S magnet for CS1-B/DS1-B sensors (SAI uses current AirTAC switches). Neighbouring bores: a 40mm bore yields 628N push at 0.5MPa, while a 63mm bore yields 1559N. A plain cylinder drifts on air loss; the cushion only decelerates. For load holding, use an external pilot check valve or the SAIL/BSAI lock variant. At 160mm stroke, rod side-load is minimal, but always guide the load to prevent bending.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X160STC
- ✓ 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 SI50X160STC FAQ
Yes, the SI50X160STC is discontinued. The direct replacement is the SAI50X160STC. It shares the identical ISO 15552 mounting interface, 50mm bore, 160mm stroke, output force, G1/4 port, and TC trunnion mounting, fitting existing fixtures perfectly.
This 50mm bore double-acting cylinder has a G1/4 air port. Theoretical forces are: 982N push and 825N pull at 0.5MPa, 1374N push at 0.7MPa, 1767N push at 0.9MPa, and a maximum force of 200kgf at 1.0MPa. It operates at 30-800mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50X160STC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X160STC replacement — usually within 7-8 hours.