This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50BX800S, 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 SI50BX800S
The AirTAC Airtac SI50 Standard Cylinder SI50BX800S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 800mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50BX800S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke800 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50BX800S
- 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 SI50BX800S
The AirTAC SI50BX800S is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore, 800mm stroke, and a SUS304 stainless steel rod. It delivers 982N push force at 0.5MPa via a G1/4 port. The direct replacement is the SAI50BX800S, matching the interface, force, and mounts.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure. Note the 800mm stroke requires external guides to prevent rod bending. The -S magnet works with CS1-B/DS1-B switches.
Airtac SI50 Standard Cylinder SI50BX800S Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50BX800S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50BX800S |
| Bore size | Ø50 mm |
| Stroke | 800 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 SAI50BX800S 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 SAI50BX800S 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 SI50BX800S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×800 | 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 SI50BX800S Is Used
Long-Stroke Diversion
Pushes packages across a 800mm transfer lane using the 982N force class, guided externally to prevent rod bending.
Pallet Handling
Actuates a 50mm bore stopper gate over an 800mm reach, with the G1/4 port maintaining steady cycle speeds.
Replacing the Airtac SI50 Standard Cylinder SI50BX800S with the SAI50BX800S
To replace the SI50BX800S, order the SAI50BX800S and verify the ISO 15552 mounting interface, G1/4 port, M16x1.5 thread, and -S magnet. The SUS304 rod offers corrosion resistance over standard carbon steel. At 0.5MPa it yields 982N push (825N pull); sizing down to a 40mm bore gives 628N, while a 63mm bore gives 1559N. For the 800mm stroke, use external guides to prevent rod bending. The cushion only decelerates; for load holding on air loss, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50BX800S
- ✓ 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 SI50BX800S FAQ
Yes, the SI50BX800S is discontinued. The direct replacement is the SAI50BX800S. It is dimensionally interchangeable per ISO 15552, retaining the same 50mm bore, 800mm stroke, G1/4 port, and mounting interface.
This double-acting cylinder has a G1/4 port and M16x1.5 rod thread. It generates 982N push and 825N pull at 0.5MPa, 1374N push at 0.7MPa, and a theoretical maximum of 200kgf at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50BX800S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50BX800S replacement — usually within 7-8 hours.