This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50BX300SH, 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 SI50BX300SH
The AirTAC SI50 Standard Cylinder SI50BX300SH 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 SAI50BX300SH, 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 → SAI50BX300SH
- 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 SI50BX300SH
The AirTAC SI50BX300SH is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 300mm stroke. Built with a SUS304 stainless piston rod (-B) and Viton H seals (-H) for 0-150C environments, it delivers 982N push at 0.5MPa via a G1/4 port. AirTAC replaced this legacy unit with the SAI50BX300SH, a direct replacement sharing the exact ISO 15552 mounting interface, bore, stroke, force and port.
The SAI upgrade features a modernized piston seal with two Y-shaped one-way elements for low start-up pressure and extended life. The -S magnet supports legacy CS1-B/DS1-B sensors, while the SAI family also introduces SAIL lock, SAIF valve and BSAI clamp variants absent from the SI line.
Airtac SI50 Standard Cylinder SI50BX300SH Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50BX300SH |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50BX300SH |
| 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 SAI50BX300SH 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 SAI50BX300SH 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 SI50BX300SH
| 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 SI50BX300SH Is Used
High-Temp Diverting
Actuates routing gates on hot material conveyors where the Viton H seal and SUS304 rod withstand sustained 150C ambient heat.
Guided Pressing
Provides 982N push at 0.5MPa for light assembly presses, requiring an external guide to manage side loads over the 300mm stroke.
Stainless Transfer
Moves parts in wash-down transfer stations using the SUS304 piston rod for corrosion resistance against moisture and cleaning agents.
Replacing the Airtac SI50 Standard Cylinder SI50BX300SH with the SAI50BX300SH
To replace the discontinued SI50BX300SH, order the SAI50BX300SH direct: it matches the ISO 15552 mounting interface, 50mm bore, 300mm stroke, G1/4 port, and Viton H high-temperature seals. Verify your mounting accessory (LB, FA, TC, etc.) and retain the -S magnet for current AirTAC switch compatibility. Because this is a 300mm stroke, use an external guide to prevent rod bending and side-load wear. For sizing, the 50mm bore yields 982N push at 0.5MPa; if undersized, the 63mm bore offers 1559N. Note that a plain cylinder drifts on air loss—the cushion only decelerates. For load holding, specify the SAIL or BSAI lock variant, or use an external pilot check valve.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50BX300SH
- ✓ 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 SI50BX300SH FAQ
Yes, the AirTAC SI50BX300SH is discontinued. The direct replacement is the SAI50BX300SH. It shares the identical ISO 15552 mounting interface, 50mm bore, 300mm stroke, output force, G1/4 port, and mounting accessories, fitting directly into existing fixtures.
It features a G1/4 air port. The thrust ratings are: 982N push and 825N pull at 0.5MPa, 1374N push at 0.7MPa, 1767N push at 0.9MPa, and a theoretical maximum of 200kgf at 1.0MPa. It operates at 30-800mm/s with a 30mm adjustable cushion.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50BX300SH
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50BX300SH replacement — usually within 7-8 hours.