This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X200S, 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 SI50X200S
The AirTAC Airtac SI50 Standard Cylinder SI50X200S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 200mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X200S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke200 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X200S
- 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 SI50X200S
The AirTAC SI50X200S is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 200mm stroke. Delivering 982N push force at 0.5MPa via a 1/4 in port, it is succeeded by the SAI50X200S, with the same bore, stroke and ISO 15552 mounting interface. AirTAC's replacement chart confirms the series path only, not every detail of an installation; check the drawing, rod end and sensor fit against your machine before swapping. The SAI features an upgraded piston seal with two Y-shaped one-way elements for lower start-up pressure and longer life. For magnet-equipped legacy SI models, position CS1-B/DS1-B switches in the sensor groove.
The SAI family also introduces variants absent from the SI line, including SAIL air-released locks, SAIF integrated 4M valves, and BSAI clamp-locks. Rod material options span carbon steel, SUS420J2, and SUS304, with Viton H seals available for high-temperature environments.
Airtac SI50 Standard Cylinder SI50X200S Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X200S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X200S |
| Bore size | Ø50 mm |
| Stroke | 200 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 SAI50X200S 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 SAI50X200S 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 SI50X200S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×200 | 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 SI50X200S Is Used
Package Diverting
Actuates diverting arms on packaging lines using the 982N push force at 0.5MPa to redirect cartons reliably without bouncing.
Pallet Stopping
Deploys heavy-duty end stops for roller conveyors, absorbing kinetic energy from pallets via the 30mm adjustable air cushion.
Clamp Actuation
Drives medium-duty machining clamps with 982N theoretical push at 0.5MPa.
Replacing the Airtac SI50 Standard Cylinder SI50X200S with the SAI50X200S
To replace the discontinued SI50X200S, order the successor SAI50X200S, verifying the ISO 15552 mounting interface, 50mm bore, 200mm stroke, 1/4 in port and thread type, and the -S magnet for current AirTAC switch compatibility. If downsizing, the 40mm bore yields 628N push at 0.5MPa; if upsizing, the 63mm bore provides 1559N. Note that a plain cylinder drifts on air loss because the adjustable cushion only decelerates at stroke end, so specify an external rod lock, pilot check valve, or the SAIL/BSAI lock variant for held loads. For 200mm strokes, guide external rods to prevent side-loading and rod bending.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X200S
- ✓ 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 SI50X200S FAQ
Yes, the SI50X200S is discontinued. The current successor is the SAI50X200S, with the same ISO 15552 mounting interface, 50mm bore, 200mm stroke, output force and 1/4 in port. Check the drawing, rod end and sensor fit against your machine before swapping.
This double-acting cylinder features a 1/4 in air port and an M16x1.5 rod thread. It delivers 982N push and 825N pull at 0.5MPa, 1374N push at 0.7MPa, 1767N push at 0.9MPa, and a maximum theoretical force of 200kgf at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50X200S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X200S replacement — usually within 7-8 hours.