Set screws, also known as grub screws, are essential fastening components used to secure one object within or against another without the need for a traditional bolt head. Although set screws may look similar externally, their performance is largely determined by the shape of their point. 

Flat point set screws are designed with a completely flat end surface that distributes pressure evenly across the contact area. This makes them ideal for applications where the screw must press against a surface without causing significant indentation or deformation. In industrial use, flat point set screws are often selected for applications involving hardened shafts or delicate components where surface preservation is important. They provide a secure hold while minimizing damage, making them suitable for repeated adjustments or assemblies that require disassembly and reassembly.

Cup point set screws are the most widely used type in industrial fastening. The concave cup-shaped tip allows the screw to bite slightly into the mating surface, creating strong holding power and resistance to vibration. It offers an excellent balance between grip strength and material compatibility, which is why cup point set screws are frequently used in machinery, motor assemblies, gears, pulleys, and general mechanical systems. In B2B applications, JLHY often recommends cup point set screws as the default choice when no extreme environmental or load conditions are present. Their versatility makes them a reliable solution for most standard engineering requirements.

Cone point set screws feature a sharp, conical tip designed to penetrate deeper into the mating material. This creates a strong mechanical lock, making them ideal for high-vibration or high-torque environments. Because of their aggressive engagement, cone point set screws are commonly used in applications where permanent or semi-permanent locking is required. These include heavy machinery, tooling systems, indexing fixtures, and applications where components must remain fixed under dynamic stress. Cone point set screws are selected when maximum retention force is required and when the mating material can support deeper indentation without structural damage.

Material Selection and Performance Considerations

Beyond point design, material selection plays a significant role in set screw performance. JLHY manufactures set screws in carbon steel, alloy steel, and stainless steel grades such as SUS304 and SUS316, depending on environmental and mechanical requirements.

Carbon steel set screws are widely used in general industrial applications due to their strength and cost efficiency. Stainless steel variants are preferred in corrosive or outdoor environments where long-term durability is essential. Heat treatment and surface coatings further enhance hardness, wear resistance, and corrosion protection.

Selecting the correct set screw type depends on multiple factors, including load conditions, vibration levels, material hardness, and whether the assembly requires future adjustment.

Flat point designs are best suited for non-damaging contact and precision positioning. Cup point screws offer balanced performance for general industrial use, while cone point screws are ideal for heavy-duty locking applications where movement must be fully restricted.

JLHY works closely with B2B customers to ensure proper selection based on real-world application conditions rather than theoretical specifications alone. Contact us today to discuss your needs.