This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50BX300, 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 SI50BX300
The AirTAC Airtac SI50 Standard Cylinder SI50BX300 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 300mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50BX300, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke300 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50BX300
- 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 SI50BX300
The AirTAC SI50BX300 is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 300mm stroke. It delivers 982N push force at 0.5MPa via a G1/4 port. The direct replacement is the SAI50BX300, matching the interface, force, and mounting.
This SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure. The -B rod is SUS304 stainless steel. With no -S suffix, this SKU lacks a magnet and cannot take a sensor.
Airtac SI50 Standard Cylinder SI50BX300 Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50BX300 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50BX300 |
| Bore size | Ø50 mm |
| Stroke | 300 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 SAI50BX300 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 SAI50BX300 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 SI50BX300
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×300 | 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 SI50BX300 Is Used
Carton Diverting
Pushes packages at 30-800 mm/s on packaging lines where the 982N thrust easily handles standard transit loads.
Light Pressing
Applies consistent downward pressure for component seating, utilizing the 825N pull force at 0.5 MPa for stable return.
Pallet Stops
Acts as a pneumatic stop mechanism for palletized goods, with the 300mm stroke providing ample reach to halt workflow.
Replacing the Airtac SI50 Standard Cylinder SI50BX300 with the SAI50BX300
To replace the SI50BX300, order the SAI50BX300. Confirm the ISO 15552 mounting interface, 50mm bore, 300mm stroke, G1/4 port (PT/G/NPT), and accessories. If sensing is needed, note this non-magnetic SKU cannot hold a switch. For sizing, a 40mm bore yields 628N push at 0.5MPa, while a 63mm bore provides 1559N. At 300mm stroke, use external guides to prevent rod bending and side-load wear. The cushion only decelerates; for load holding on air loss, use an external pilot check valve or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50BX300
- ✓ 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 SI50BX300 FAQ
Yes, the SI50BX300 is discontinued. The direct replacement is the SAI50BX300. It is dimensionally interchangeable per ISO 15552, keeping the same 50mm bore, 300mm stroke, G1/4 port, and mounting fixtures.
It features a G1/4 port and delivers a push force of 982N and pull of 825N at 0.5 MPa. At 0.7 MPa push is 1374N, and 1767N at 0.9 MPa. The theoretical maximum force is 200 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50BX300
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50BX300 replacement — usually within 7-8 hours.