Keyence FU-35FA M3 Coaxial Reflective Fiber Unit

Keyence FU-35FA is a reflective fiber unit with a compact M3 threaded coaxial design. Used as a sensing head with Keyence fiber amplifiers (FS‑N, FS‑V series) for detecting small objects in tight spaces. 1 m flexible fiber (ø1.3×2) free‑cut to required length. Minimum bending radius R25 mm. Minimum detectable object 0.005 mm gold wire. Operating temperature –40 to +70 °C.

Applications:

• Detection of miniature components in electronics assembly

• Part presence verification in semiconductor and precision machining

• Object detection in packaging machinery with limited space

• Integration into high‑density automation panels and miniature assembly lines

Core Specifications:

• Fiber type: Reflective (coaxial detection arrangement)

• Thread size: M3

• Fiber length: 1 m (free‑cut)

• Fiber diameter: ø1.3 mm × 2

• Shape: Straight

• Minimum bending radius: R25 mm

• Minimum detectable object: ø0.005 mm gold wire *

• Ambient temperature: –40 to +70 °C

• Weight: approx. 6 g

System Integration:

• This fiber unit belongs to the Keyence FU series.

• M3 coaxial design aligns the fiber axis and optical path for stable detection across different target surfaces and angles.

• Flexible free‑cut fiber can be trimmed to exact length for cable management in confined machinery.

• Compatible with Keyence FS‑N series fiber amplifiers for detection distance from 45 mm (HSP) to 550 mm (MEGA), depending on amplifier and mode.

Standards & Compliance:
Refer to manufacturer official documentation for detailed certification and compliance information.

Related Products:

• FS‑N series – Digital fiber amplifiers for use with FU‑35FA

• FU‑35FZ – High sensitivity version for precision applications

• FU‑35TZ – High anti‑interference version for harsh environments

• F‑2HA – Small spot lens for FU‑35FA (approx. ø0.4 mm spot)