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

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