Set Screws
Set screws, also known as grub screws or blind screws, are types of fasteners designed to secure one object within or against another object without the need for a nut. Unlike traditional screws, set screws typically do not have a head and are fully threaded along their entire length. They are threaded on one end and usually have a blunt or pointed tip on the other end.
Set screws are commonly used to secure rotating parts such as shafts or gears onto a shaft or to fix one object tightly against another object, such as securing a pulley onto a shaft. They are often used in applications where space is limited or where a smooth external surface is desired because they can be installed flush with or below the surface of the material.
Set screws are typically tightened using an Allen key or hex key, which fits into a hexagonal socket or recessed hole on the top of the screw. This drive type allows for easy tightening and loosening of the screw without the need for additional tools.
Set screws are available in various materials such as steel, stainless steel, brass, and nylon, depending on the application requirements. They come in different thread sizes, lengths, and tip types (e.g., cup point, flat point, cone point) to accommodate different applications and materials. The choice of set screw depends on factors such as the type of material being fastened, the required holding strength, and environmental conditions.
Hexagon socket set screw
Head Type: Typically has a cylindrical head with a hexagonal recessed drive.
Drive Type: Hexagonal Allen key or wrench is used to tighten or loosen.
Sizes: M3 to M12 and lengths from 6 mm to 100 mm.
Application: Commonly used in machinery and equipment assembly to secure rotating components such as gears or pulleys onto shafts, as well as in various industrial and DIY projects.
Material: Hexagon socket set screws are typically made from materials such as stainless steel, carbon steel, or alloy steel, depending on the application's demands.
Slotted set screw
Head Type: Features a flat or slightly domed head with a single straight slot across the top.
Drive Type: A flat-blade screwdriver is used to tighten or loosen the screw.
Sizes: M3 to M10 and lengths ranging from 6 mm to 80 mm.
Application: Slotted set screws are commonly used in applications where adjustments need to be made frequently, such as in machinery setup or alignment tasks.
Material: Similar to hexagon socket set screws, slotted set screws are often made from stainless steel, carbon steel, or alloy steel to suit different environmental conditions and load requirements.
SURFACE TREATMENT OF SET SCREWS
Zinc Plating: This is one of the most common surface treatments for set screws. Zinc plating provides corrosion resistance by forming a protective layer on the surface of the screw. It also offers some degree of lubricity, aiding in easier installation.
Black Oxide Coating: Black oxide coating provides a black finish to set screws while offering moderate corrosion resistance. It also provides some lubricity and improves the aesthetics of the screw.
Nickel Plating: Nickel plating is used to enhance corrosion resistance and improve the appearance of set screws. It provides a bright and shiny finish while offering good protection against rust and wear.
Cadmium Plating: Cadmium plating is less common due to environmental concerns, but it provides excellent corrosion resistance and durability. However, cadmium is toxic, so its use is restricted in many applications.
Hot Dip Galvanizing: This process involves immersing the set screws in molten zinc to provide a thick, durable coating that offers excellent corrosion protection, especially in harsh environments.