This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50BX500N, 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 SI50BX500N
The AirTAC Airtac SI50 Standard Cylinder SI50BX500N 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 SAI50BX500N, 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 → SAI50BX500N
- 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 SI50BX500N
The AirTAC SI50BX500N is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 500mm stroke. Delivering 982N push at 0.5MPa via a G1/4 port, it is replaced by the SAI50BX500N. This direct upgrade retains the exact ISO 15552 mounting interface, force, and accessories.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. This SKU uses an NBR seal (-N) for -20 to +70C, a SUS304 stainless rod (-B), and lacks a magnet so cannot take sensors. The SAI family adds SAIL and BSAI lock variants the SI lacked.
Airtac SI50 Standard Cylinder SI50BX500N Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50BX500N |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50BX500N |
| 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 SAI50BX500N 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 SAI50BX500N 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 SI50BX500N
| 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 SI50BX500N Is Used
Long-Stroke Diversion
Pushes packages across a 500mm transfer gap with a 982N thrust at 0.5MPa, guided externally to prevent rod bending.
Stainless Rod Washdown
Uses the SUS304 rod option for corrosion resistance in damp assembly areas, operating at 30-800mm/s.
Replacing the Airtac SI50 Standard Cylinder SI50BX500N with the SAI50BX500N
To replace the SI50BX500N, order the SAI50BX500N. Verify the ISO 15552 mounting interface, 50mm bore, 500mm stroke, G1/4 port, and NBR seals. Because this is a 500mm stroke, prevent rod bending by using an external guide to absorb side loads. For sizing, neighbouring bores are 40mm (628N [email protected]) and 63mm (1559N [email protected]). This plain cylinder drifts on air loss; for load holding use an external pilot check valve or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50BX500N
- ✓ 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 SI50BX500N FAQ
Yes, the SI50BX500N is discontinued. The direct replacement is the SAI50BX500N, which shares the same ISO 15552 mounting interface, 50mm bore, 500mm stroke, force, and G1/4 port.
It features a G1/4 port and delivers 982N push / 825N pull at 0.5MPa, 1374N push at 0.7MPa, 1767N push at 0.9MPa, and a 200kgf max at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50BX500N
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50BX500N replacement — usually within 7-8 hours.