M3 M4 Carbon Steel Black Phillips Countersunk Head Machine Screws for Electronics & Furniture

Our Carbon Steel Black Phillips Countersunk Head Machine Screws are professional-grade fasteners designed for precision assembly, electronics, furniture, and DIY projects. Crafted from high-quality carbon steel with a black oxide finish, these screws offer exceptional durability, corrosion resistance, and a sleek, low-profile appearance that complements any application where a flush finish is required.

 

Featuring a Phillips (cross) drive and countersunk (flat) head design, these machine screws sit flush with the surface of your material once installed, eliminating protruding heads and ensuring a clean, professional look. The precise machine teeth deliver strong threading, providing a secure, tight fit with corresponding nuts or pre-tapped holes, preventing loosening even in high-vibration environments.

 

Available in two essential sizes—M3 and M4—these screws cover a wide range of common assembly needs, making them versatile for use in electronics (circuit boards, small appliances), furniture assembly (cabinets, drawers), DIY craft projects, light industrial machinery, and hardware installation. The black oxide finish not only enhances rust resistance but also adds a professional, understated aesthetic that works well with both industrial and consumer-facing products.

 

Lightweight yet robust, these machine screws are easy to install with a standard Phillips screwdriver, suitable for both professionals (assemblers, technicians) and DIY enthusiasts. Whether you’re working on precision electronics, building furniture, or completing a home repair, these carbon steel countersunk head screws deliver consistent performance, reliability, and a clean finish every time.