This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50AX200S, 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 SI50AX200S
The AirTAC Airtac SI50 Standard Cylinder SI50AX200S 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 SAI50AX200S, 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 → SAI50AX200S
- 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 SI50AX200S
The AirTAC SI50AX200S is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore, 200mm stroke, G1/4 port and a SUS420J2 stainless piston rod. Delivering 982N push force at 0.5MPa, it is replaced by the SAI50AX200S. This direct upgrade shares the exact ISO 15552 mounting interface, bore, stroke, port and output force. The SAI features an upgraded piston seal using two Y-shaped one-way elements for low start-up pressure and long life.
The -S magnet supports legacy CS1-B/DS1-B switches, while the SAI family adds SAIL, SAIF and BSAI lock variants. Note that a plain cylinder drifts on air loss; the cushion only decelerates.
Airtac SI50 Standard Cylinder SI50AX200S Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50AX200S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50AX200S |
| 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 SAI50AX200S 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 SAI50AX200S 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 SI50AX200S
| 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 SI50AX200S Is Used
Stainless Rod Clamping
Ideal for fixture clamping requiring corrosion resistance, using the SUS420J2 rod to deliver 982N push force reliably in humid production environments.
Diversion Gate Actuation
Drives routing gates on material handling conveyors, where the 200mm stroke and adjustable 30mm air cushions ensure smooth end-of-travel deceleration.
Replacing the Airtac SI50 Standard Cylinder SI50AX200S with the SAI50AX200S
To replace the SI50AX200S, order the SAI50AX200S, confirming the ISO 15552 interface, 50mm bore, 200mm stroke, G1/4 port and SUS420J2 rod. The -S magnet enables CS1-B/DS1-B sensors. If downsizing, a 40mm bore yields 628N push at 0.5MPa; if upsizing, a 63mm bore provides 1559N. A plain cylinder does not hold load without live air, so for vertical holding use the SAIL lock or an external pilot check valve. The SAI family also offers the SAIF valve and BSAI clamp-lock variants. At 200mm stroke, side-load is minimal, but always guide the rod to prevent bending.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50AX200S
- ✓ 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 SI50AX200S FAQ
Yes, the SI50AX200S is discontinued. The direct replacement is the SAI50AX200S. It shares the same ISO 15552 mounting interface, 50mm bore, 200mm stroke, G1/4 port and output force, fitting existing fixtures perfectly.
The G1/4 port bore delivers a push force of 982N and pull of 825N at 0.5MPa, 1374N push at 0.7MPa, 1767N at 0.9MPa, and a theoretical max of 200kgf at 1.0MPa. It operates at 30-800mm/s with a 30mm adjustable cushion.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50AX200S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50AX200S replacement — usually within 7-8 hours.