Premium Machine Screws Phil Undercut Flat 18/8 Stainless Black Oxide 4-40 x 3/8 are designed for precise, flush-fastening in electronics, cabinetry, and machinery. The combination of corrosion-resistant 18/8 stainless steel with a durable black oxide finish delivers long-lasting performance and a clean look in tight spaces.

Key specifications

• Thread size: 4-40
• Length: 3/8 inch
• Drive type: Phillips
• Head style: Undercut Flat
• Material: 18/8 stainless steel (AISI 304)
• Finish: Black oxide
• Type: Machine screw

Why choose these screws

• High corrosion resistance thanks to 18/8 stainless steel for durable performance in varying environments.
• Low-profile, flush-fit head reduces protrusion for clean assemblies.
• Undercut head design and Phillips drive provide reliable seating and easy drive with standard tools.
• Black oxide finish adds an extra layer of protection and a professional appearance on dark assemblies.

Ideal applications

• Electronics enclosures and panels
• Appliances, motors, and equipment assemblies
• Cabinetry, furniture, and machinery where a flush, secure fastener is required

Choose these 4-40 x 3/8 undercut flat machine screws when you need precise fit, sturdy hold, and a corrosion-resistant solution that blends with metallic surfaces while delivering a clean, professional finish.