Buy Hex Set Screws Online in Australia
Hex Set Screws (Grub Screws) — Full Metric Range
Hex set screws — also known as grub screws — are headless threaded fasteners tightened with a hex key, used to lock components such as pulleys, gears, sprockets, and shaft collars onto shafts and spindles. Unlike cap screws, set screws sit flush or below the surface of the component, making them the preferred choice where a projecting head would create interference with guards, adjacent components, or moving parts. AIMS stocks hex set screws across a full range of metric sizes, point styles, and material grades for immediate dispatch.
Point Styles and Their Applications
The point style determines how the set screw engages with the shaft and the type of joint it creates. Cup point set screws are the most commonly used — the cup-shaped indent bites into the shaft surface to create a strong mechanical interlock and positive resistance against axial movement. Flat point set screws distribute load over a larger shaft area and are preferred for softer shaft materials or applications requiring periodic disassembly without shaft damage. Dog point (half dog) set screws engage a mating drilled flat on the shaft for precise axial and radial location. Cone point set screws provide maximum holding force and are used for permanent installations. Knurled cup points combine cup point grip with an added serrated ring for additional locking.
Material and Coating Selection
Standard hex set screws in carbon steel with black oxide or zinc plating are suitable for most general engineering and machine assembly applications. Stainless steel set screws in Grade 304 are specified for food processing, pharmaceutical, marine, and corrosive environments where carbon steel would be subject to rust or contamination. For particularly corrosive applications, Grade 316 stainless steel offers superior resistance. High-tensile set screws to Class 45H are available for applications requiring maximum holding force in a small screw size, such as high-torque drive applications on shaft collars and hubs.
AIMS stocks hex set screws across all standard metric sizes from M3 to M24 in the most common point styles and materials. For quantities, unusual sizes, or material certifications, contact our team.
AIMS stocks hex set screws across the full standard metric size range from M3 to M24 in cup point as standard, with flat point, dog point, and cone point available on request. Stainless steel and high-tensile grades are stocked in the most common sizes, and materials certifications are available for traceability-critical assembly and engineering applications where documentation is required. Contact our team for non-catalogue sizes or grade-specific requirements.