Keyence FU-21X | High-Flex Fiber Optic Sensor Head for FS

Keyence FU-21X | Flexible Fiber Optic Sensor Head for Tight-Space Detection

Overview

The Keyence FU-21X is a high-flex fiber optic sensor head designed for use with the FS Series fiber optic amplifiers. It features an ultra-flexible fiber jacket and a side-view sensing direction, making it ideal for compact and dynamic applications such as moving machinery, limited mounting spaces, or robotics.

With strong resistance to repetitive bending and environmental stress, the FU-21X offers long-lasting precision detection in harsh industrial environments.

Key Features

• Side-View Detection – 90° sensing angle for side-access installations

• Ultra-Flexible Jacket – Built for movement and tight routing

• Slim and Compact – Perfect for small equipment or restricted areas

• High Durability – Resists vibration, abrasion, and repeated bending

• Plug-and-Play with FS Series – Compatible with FS-V10, FS-V20, FS-N Series, and others

Technical Specifications

• Model: FU-21X

• Detection Type: Side-view reflective

• Fiber Length: 2 meters (cuttable to fit)

• Minimum Detectable Object: Approx. 0.005 mm (with FS amplifier)

• Bend Radius: R4 mm or more (with high-flex sheath)

• Temperature Range: –40 to +70°C

• Jacket Type: High-flex, protective outer coating

• Mounting: Screw or optional fiber clamp

• Compatible Amplifiers: FS-V10/20 Series, FS-N Series, etc.

Applications

• Electronics and PCB Assembly – Detect tiny components in tight spaces

• Automation Systems – Withstands constant motion and vibration

• Packaging Equipment – Slim profile fits into narrow equipment zones

• Precision Part Detection – Accurate, repeatable detection of small items

Why Choose the Keyence FU-21X?

• Compact and flexible for tough installation environments

• Durable construction for long-term stability

• Precise side-view detection for micro-targets

Order Now

Available and ready for fast worldwide shipping. Compatible accessories and amplifiers also in stock.

NEW product in original sealed packaging. The product may be of older version or design. The packaging may have markings, signs of discoloration, and wear. DDPARTSSOLUTION Warranty: 1 Year. Manufacturer's Warranty and Support NEVER apply