This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50BX800, 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 SI50BX800
The AirTAC Airtac SI50 Standard Cylinder SI50BX800 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 SAI50BX800, 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 → SAI50BX800
- 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 SI50BX800
The AirTAC SI50BX800 is a discontinued double-acting ISO 15552 profile cylinder with a 50 mm bore and 800 mm stroke, delivering a push force of 982 N at 0.5 MPa. It features a Ø20 mm rod, M16x1.5 thread, and a G1/4 air port. AirTAC replaced this EOL unit with the SAI50BX800, a direct upgrade retaining the exact ISO 15552 mounting interface, bore, stroke, and port size.
The SAI upgrade introduces an advanced two-piece Y-shaped piston seal for low start-up pressure and extended life. This SKU lacks a magnet, so it cannot accept a CS1-B/DS1-B sensor. For high-temperature environments, a Viton H seal option extends operation to 150 C.
Airtac SI50 Standard Cylinder SI50BX800 Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50BX800 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50BX800 |
| 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 SAI50BX800 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 SAI50BX800 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 SI50BX800
| 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 SI50BX800 Is Used
Long-Stroke Diversion
Pushes packages across transfer lines with a 982 N push force, utilizing the full 800 mm travel to shift products between parallel conveyor belts.
Automated Door Actuation
Opens large industrial machine guard doors over an 800 mm span, relying on the 30 mm adjustable air cushions to decelerate the motion smoothly.
Replacing the Airtac SI50 Standard Cylinder SI50BX800 with the SAI50BX800
To replace the SI50BX800, order the SAI50BX800. Verify your ISO 15552 mounting accessory (LB, FA, TC, etc.), the G1/4 port, and the M16x1.5 rod thread. Because this SKU lacks the -S magnet, it cannot support position sensing; if switches are needed, select an SAI50BX800S. Sizing both ways: the 50 mm bore yields 982 N push at 0.5 MPa, while a neighbouring 63 mm bore offers 1559 N. For load holding on air loss, a plain cylinder drifts; use an external pilot check valve or the SAIL/BSAI lock variant. At 800 mm, prevent rod bending by using an external guide to absorb side loads.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50BX800
- ✓ 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 SI50BX800 FAQ
Yes, the AirTAC SI50BX800 is discontinued. The direct replacement is the SAI50BX800. It is dimensionally interchangeable per ISO 15552, matching the 50 mm bore, 800 mm stroke, G1/4 port, and mounting interface, but adds an upgraded piston seal.
The 50 mm bore operates on a G1/4 port. At 0.5 MPa it provides 982 N push and 825 N pull force. At 0.7 MPa push is 1374 N, and at 0.9 MPa it is 1767 N. The theoretical maximum force is 200 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50BX800
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50BX800 replacement — usually within 7-8 hours.