Socket Set Screws (Grub Screws) — Unbrako Knurled Cup Point

Unbrako Socket Set Screws, commonly known as grub screws, are headless fasteners designed to secure components against or within a shaft using point pressure alone. Available in metric sizes M3 through M20, these set screws feature the distinctive Unbrako knurled cup point that bites into the mating surface with a minimum hardness of HRc 45, creating a permanent impression for superior holding power against rotation and axial movement. The full-body hexagon socket allows flush or below-surface installation, making them ideal for shaft collars, pulleys, gears, and couplings where no external protrusion is permitted. Manufactured from high-carbon alloy steel with controlled heat treatment, Unbrako set screws deliver consistent clamping force across millions of fastening cycles. With five point styles available — knurled cup, flat, cone, dog, and half-dog — engineers can select the optimal point geometry for their application. Shri Narayan Machinery LLP supplies Unbrako set screws in Noida with complete technical guidance.