The Keyence FU-R77 is a threaded, hex-shaped active receiver fiber unit engineered for precision detection in compact industrial applications. Featuring an M4 threaded body, asymmetric optical axis design, and free-cut 2 m fiber length, the FU-R77 delivers reliable performance while offering flexibility for integration into space-constrained machinery and high-speed automation systems.

A defining strength of the FU-R77 is its M4 threaded hex-shaped construction, which enables secure and stable installation directly into machine fixtures or brackets. This compact mounting format is especially valuable in environments where space is limited and sensors must be positioned with absolute precision. The hex body also allows easy tightening, ensuring that the sensor remains firmly in place even in vibration-prone conditions.

The FU-R77 functions as an active receiver fiber, working in tandem with a transmitter fiber to form a through-beam detection system. The design employs an asymmetric optical axis: the transmitter projects a fine beam with a diameter of ‚àö‚àè1 mm (0.04″), while the receiver accepts a larger ‚àö‚àè3.2 mm (0.13″) beam. This configuration ensures stable detection by accommodating slight misalignments and improving reliability in dynamic or high-speed applications. It also enables accurate sensing of very small or thin objects, making it suitable for precision assembly and inspection tasks.

The fiber unit comes with a 2 m (6.6′) length, providing installers with the flexibility to adapt it to a variety of system layouts. Its free-cut design means that the fiber can be trimmed to the exact length required, eliminating excess slack and simplifying cable management. This ensures neat and efficient installations, whether in compact tools or larger machinery.

At just ‚àö‚àè2.2 mm (0.09″) in diameter, the FU-R77 maintains a slim profile while delivering the durability needed for industrial use. Its compact construction allows it to fit into machinery with dense configurations, while still maintaining stable optical performance.

The FU-R77 is particularly well suited for industries requiring micro-scale precision and rugged reliability. In electronics manufacturing, it detects small leads, pins, or soldered joints. In semiconductor fabrication, it ensures the accurate positioning of wafers or glass substrates. In automotive or precision machining environments, it provides reliable part verification, even under conditions where vibration and speed pose challenges.

In summary, the Keyence FU-R77 is a compact, high-precision threaded active receiver fiber unit designed for demanding applications. With its M4 hex-shaped design, asymmetric optical axis, 2 m free-cut fiber, and slim housing, it offers a balance of precision, flexibility, and durability. For manufacturers seeking accurate detection of small objects in tight or complex setups, the FU-R77 is a dependable and versatile choice.