This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI200BX185S, 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 SI200 Standard Cylinder SI200BX185S
The AirTAC SI200 Standard Cylinder SI200BX185S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø200mm bore and 185mm stroke, G3/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI200BX185S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ200 mm
- Stroke185 mm
- Port sizeG3/4
- Acting typeDouble acting
- Rod threadM36×2.0
- StatusDiscontinued → SAI200BX185S
- 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 SI200 Standard Cylinder SI200BX185S
The AirTAC SI200BX185S is a discontinued double-acting ISO 15552 profile cylinder with a 200mm bore and 185mm stroke. Built for heavy-duty thrust, it delivers 15708N push and 15080N pull at 0.5MPa, utilizing a G3/4 air port and a 40mm SUS304 stainless steel rod. AirTAC replaced this EOL unit with the SAI200BX185S, a direct replacement sharing the exact ISO 15552 mounting interface, bore, stroke, and force ratings.
The SAI upgrade features an advanced piston seal with two Y-shaped one-way elements for low start-up pressure and extended life. This -S model includes a piston magnet for legacy CS1-B/DS1-B sensors, and the SAI family introduces SAIL and BSAI lock variants the SI lacked.
Airtac SI200 Standard Cylinder SI200BX185S Technical Specifications
| Model | Airtac SI200 Standard Cylinder SI200BX185S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI200BX185S |
| Bore size | Ø200 mm |
| Stroke | 185 mm |
| Acting type | Double acting |
| Port size | G3/4 |
| Rod thread | M36×2.0 |
| 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 – 500 mm/s |
| Cushion | Adjustable, 50 mm |
| Max standard stroke | Up to 1500 mm |
Specifications follow the official AirTAC SI datasheet (now discontinued). The SAI200BX185S carries the same ISO 15552 ratings. Confirm against the product label before installation. Thread options: PT / G / NPT.
Theoretical Output Force (Ø200mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 15708 N | 15080 N |
| 0.7 MPa | 21991 N | — |
| Max (@1.0 MPa) | 3204 kgf | |
The SAI200BX185S produces the same force from the same bore. Actual usable force is lower than theoretical; size with a margin.
Model Code: Airtac SI200 Standard Cylinder SI200BX185S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 200 | Bore size in mm. |
| ×185 | 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 SI200 Standard Cylinder SI200BX185S Is Used
Heavy Press Forming
Drives large metal stamping and forming presses where 15708N of thrust at 0.5MPa is required to shape thick plate materials.
Automated Assembly Platens
Actuates large machinery platens and heavy clamping fixtures, relying on the G3/4 port for high-volume air flow.
Replacing the Airtac SI200 Standard Cylinder SI200BX185S with the SAI200BX185S
To replace the SI200BX185S, order the SAI200BX185S, confirming the ISO 15552 mounting interface, 185mm stroke, G3/4 port, and the -S magnet. If you need to size both ways, neighboring bores alter the force: a 160mm bore yields 10053N push at 0.5MPa, while a 200mm bore hits 21991N at 0.7MPa. Because this is a 185mm stroke, ensure your guidance handles potential side-load and rod-bending forces. Note that a plain cylinder drifts without live air; the 50mm adjustable cushion only decelerates. For load holding, use an external rod lock, pilot check valve, or the SAI-only SAIL/BSAI lock variants. The -B rod is SUS304 stainless steel, and Viton H seals raise operating temperature to 0-150C.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI200BX185S
- ✓ Same bore / stroke / force
- ✓ Port/thread type (PT/G/NPT)
- ✓ Magnet (-S) for sensors?
- ✓ Mounting reused (FA/FB/CA/CB/CR/LB/TC)
Airtac SI200 Standard Cylinder SI200BX185S FAQ
Yes, the SI200BX185S is discontinued. The direct replacement is the SAI200BX185S. It shares the identical ISO 15552 mounting interface, 200mm bore, 185mm stroke, output force, and G3/4 port, fitting existing fixtures perfectly while upgrading the piston seal.
The 200mm bore delivers 15708N push and 15080N pull at 0.5MPa, 21991N push at 0.7MPa, and a theoretical max of 3204kgf at 1.0MPa. Operating speed is 30-500mm/s, it uses a G3/4 port, and features a 50mm adjustable air cushion at both ends.
Related AirTAC SAI Cylinders
Request a Quote for the SAI200BX185S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI200BX185S replacement — usually within 7-8 hours.