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4-40UNC Imperial Grub Screws
Description
Grub Screw – 4-40 UNC Stainless Steel
Our 4-40 UNC Grub Screws (socket set screws) are compact, precision fasteners designed for internal clamping in small-scale assemblies where space is limited and a flush finish is required. Headless by design, these screws sit entirely within the tapped hole, making them perfect for securing miniature components like shafts, collars, or gears without surface obstruction.
The 4-40 UNC (Unified National Coarse) thread offers strong engagement in smaller tapped holes, ideal for electronics, instrumentation, and light mechanical systems. Despite their small size, these screws provide reliable holding power and vibration resistance in delicate or precision-critical environments.
Equipped with a hex socket drive, they are easy to install using a miniature Allen key, allowing for precise torque control and secure fastening. Made from corrosion-resistant stainless steel, they are suitable for environments exposed to moisture, mild chemicals, or general wear—delivering long-term durability and performance.
Whether used in circuit boards, robotics, or fine assemblies, our 4-40 UNC Grub Screws offer clean, reliable fastening where every millimeter counts.
