This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50BX500SH, 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 SI50BX500SH
The AirTAC SI50 Standard Cylinder SI50BX500SH 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 SAI50BX500SH, 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 → SAI50BX500SH
- 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 SI50BX500SH
The AirTAC SI50BX500SH is a discontinued double-acting ISO 15552 profile cylinder featuring a 50mm bore, 500mm stroke, SUS304 stainless rod, high-temp Viton H seals and a piston magnet. 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 SAI50BX500SH, a direct sharing the exact ISO 15552 mounting interface, bore, force and stroke.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and extended life. Because this is a 500mm stroke, external guides are recommended to prevent rod bending under side loads.
Airtac SI50 Standard Cylinder SI50BX500SH Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50BX500SH |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50BX500SH |
| 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 SAI50BX500SH 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 SAI50BX500SH 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 SI50BX500SH
| 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 SI50BX500SH Is Used
High-Temp Diverting
Actuates diverting gates on hot material conveyors, utilising the Viton H seals and 500mm reach to span wide belts reliably.
Stainless Washdown Push
Pushes product in washdown zones where the SUS304 rod prevents corrosion, providing 982 N of thrust at 0.5 MPa.
Long-Reach Ejection
Ejects moulded parts from deep press beds, using the 500mm stroke while external guides absorb side-load forces.
Replacing the Airtac SI50 Standard Cylinder SI50BX500SH with the SAI50BX500SH
To replace the SI50BX500SH, order the SAI50BX500SH. Confirm the ISO 15552 mounting interface, G1/4 port, M16x1.5 rod thread and 30mm cushions match your fixture. Retain the -S magnet for current AirTAC switches, the -B SUS304 rod for corrosion resistance, and -H Viton seals for 0-150 C environments. If you need more force, the 63mm bore offers 1559 N push at 0.5 MPa; if less is required, the 40mm bore provides 628 N. Note that a plain cylinder drifts on air loss—the cushion only decelerates. For load holding, use an external pilot check valve or the SAIL/BSAI lock variants. At 500mm stroke, use external guides to mitigate rod-bending side loads.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50BX500SH
- ✓ 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 SI50BX500SH FAQ
Yes, the SI50BX500SH is discontinued. The direct replacement is the SAI50BX500SH. It shares the same ISO 15552 mounting interface, 50mm bore, 500mm stroke, 982 N force, G1/4 port and SUS304 rod, fitting existing fixtures perfectly.
It features a G1/4 air port and delivers 982 N push and 825 N pull at 0.5 MPa, 1374 N push at 0.7 MPa, and a theoretical maximum of 200 kgf at 1.0 MPa. The SAI replacement retains these exact ratings while upgrading the piston seal.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50BX500SH
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50BX500SH replacement — usually within 7-8 hours.