This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50BX500S, 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 SI50BX500S
The AirTAC Airtac SI50 Standard Cylinder SI50BX500S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 500mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50BX500S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke500 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50BX500S
- 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 SI50BX500S
The AirTAC SI50BX500S is a discontinued double-acting ISO 15552 profile cylinder featuring a SUS304 stainless steel rod and a 500 mm stroke. It delivers 982 N push and 825 N pull at 0.5 MPa through a G1/4 port. AirTAC replaced this legacy unit with the SAI50BX500S, a direct sharing the exact bore, stroke, force, port and ISO 15552 mounting interface.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and long life. The SAI family also adds SAIL, SAIF and BSAI lock variants the SI lacked. Your built-in magnet works with legacy CS1-B/DS1-B switches.
Airtac SI50 Standard Cylinder SI50BX500S Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50BX500S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50BX500S |
| Bore size | Ø50 mm |
| Stroke | 500 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 SAI50BX500S 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 SAI50BX500S 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 SI50BX500S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×500 | 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 SI50BX500S Is Used
Long-Stroke Diversion
Executes 500 mm pusher travel on packaging lines, using the SUS304 rod to resist washdown moisture while diverting goods between conveyors.
Pneumatic Slide Gate
Actuates 500 mm to open bulk material hoppers, relying on adjustable end cushions to decelerate the heavy gate smoothly.
Replacing the Airtac SI50 Standard Cylinder SI50BX500S with the SAI50BX500S
To replace the SI50BX500S, order the SAI50BX500S. Confirm the ISO 15552 mounting interface, 50 mm bore, 500 mm stroke, G1/4 port (PT/G/NPT thread options) and mounting accessory. The -B rod is SUS304 stainless; the -S magnet supports CS1-B/DS1-B sensors. If sizing alternatives, neighboring bores offer different forces: a 40 mm bore yields 628 N push, while a 63 mm bore yields 1559 N at 0.5 MPa. For this 500 mm stroke, use external guides to prevent rod bending and side-load wear. A plain cylinder drifts on air loss; for load holding, use an external pilot check valve or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50BX500S
- ✓ 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 SI50BX500S FAQ
Yes, the SI50BX500S is discontinued. The direct replacement is the SAI50BX500S. It shares the identical ISO 15552 mounting interface, 50 mm bore, 500 mm stroke, output force, G1/4 port and accessories, fitting existing fixtures perfectly.
This double-acting cylinder has a G1/4 port. It delivers 982 N push and 825 N pull at 0.5 MPa, 1374 N push at 0.7 MPa, and a theoretical maximum force of 200 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50BX500S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50BX500S replacement — usually within 7-8 hours.