This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X430S, 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 SI50X430S
The AirTAC Airtac SI50 Standard Cylinder SI50X430S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 430mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X430S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke430 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X430S
- 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 SI50X430S
The AirTAC SI50X430S is a discontinued double-acting ISO 15552 profile cylinder with a 50 mm bore and 430 mm stroke, delivering 982 N push force at 0.5 MPa through its G1/4 port. AirTAC replaced this legacy unit with the SAI50X430S. This current-production direct maintains the exact ISO 15552 mounting interface, bore, stroke, output force, and port size, fitting existing fixtures perfectly.
The SAI upgrade features a revised piston seal with two Y-shaped one-way elements for low start-up pressure and extended life. The SI -S suffix denotes a piston magnet for CS1-B/DS1-B switches, while the SAI family adds SAIL, SAIF, and BSAI lock variants absent from the SI line.
Airtac SI50 Standard Cylinder SI50X430S Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X430S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X430S |
| Bore size | Ø50 mm |
| Stroke | 430 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 SAI50X430S 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 SAI50X430S 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 SI50X430S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×430 | 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 SI50X430S Is Used
Extended Stroke Diversion
Pushes packages across a 430 mm transfer gap with 982 N of force at 0.5 MPa, requiring external guides to prevent rod bending over the long travel.
Long-Reach Clamping
Actuates a remote clamping fixture 430 mm away, using the G1/4 port and ISO 15552 mounting to integrate seamlessly into existing machinery.
Replacing the Airtac SI50 Standard Cylinder SI50X430S with the SAI50X430S
To replace the SI50X430S, order the SAI50X430S and verify the ISO 15552 mounting interface, G1/4 port, and M16x1.5 rod thread. Retain your original mounting accessory and confirm the -S magnet for current AirTAC switches. For sizing alternatives, a 40 mm bore yields 628 N push at 0.5 MPa, while a 63 mm bore provides 1559 N. Because this is a 430 mm stroke, use an external guide to prevent rod bending and side-load damage. A plain cylinder drifts on air loss; for load holding, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X430S
- ✓ 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 SI50X430S FAQ
Yes, the AirTAC SI50X430S is discontinued. The direct replacement is the SAI50X430S. It is dimensionally interchangeable per ISO 15552, retaining the same 50 mm bore, 430 mm stroke, output force, G1/4 port, and mounting interface.
The bore features a G1/4 air port and delivers 982 N push and 825 N pull at 0.5 MPa. At 0.7 MPa it pushes 1374 N, and the theoretical maximum force is 200 kgf at 1.0 MPa. It operates at speeds of 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50X430S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X430S replacement — usually within 7-8 hours.