M9×0.5 Focusable Laser Diode Housing – 5.6mm TO-18, 18×45mm

The Laser-Housing-18X45mm is a full-metal, focusable laser diode housing designed to mount and protect standard 5.6mm TO-18 laser diodes while providing precise beam adjustment. Its body measures 18mm in diameter and 45mm in length, and the front aperture uses a standard M9×0.5 thread—the common interface for interchangeable laser collimating lenses. This combination makes the housing compatible with a wide range of 5.6mm diodes and M9-threaded optics, allowing builders to swap lenses as project requirements change.

The housing serves two practical purposes: mechanical protection and optical control. The metal enclosure shields the delicate diode can from physical impact, dust, and thermal stress, while the focusable lens assembly lets the user adjust the distance between the diode emitter and the lens to achieve the desired beam spot or collimation. The kit includes the housing shell, a spring, a spring base, and a lens, so the core assembly can be completed without sourcing additional retaining hardware. The metal lens frame provides stable threading and consistent focus retention compared with plastic-bodied alternatives.

This housing is commonly used in laser pointer builds, DIY laser engraving and marking setups, optical experiments, and industrial or research applications where a 5.6mm diode needs a compact, serviceable metal mount with an M9 optical interface. The wavelength range that can be used depends primarily on the diode and lens installed; the housing itself is a passive mechanical and optical component, not an active laser module.