A Comprehensive Guide to Popular Types of Screws

Screws are common forms of fasteners that are used to secure items in a multitude of settings, ranging in application from the assembly of miniature electronic devices to the construction of large industrial machinery. The versatility and functionality of screws make them indispensable in many industries, where different designs have come about over time to address specific needs and tasks. This comprehensive guide will explore some of the most popular forms of screws used across industries today, ensuring that you can find the most optimal choice for security and reliability.

Machine Screws

Standard machine screws are among the most ubiquitous forms, finding use in everything from DIY projects to highly advanced aerospace assemblies. These fasteners are designed with a uniform diameter and external threading that extends along their entire shaft, making them suitable for securing two or more parts that are made from metals, plastics, or composites. Generally, the tail end of the screw is driven into materials using a screwdriver to provide torque for tightening, though some assemblies may make use of pre-established threading or pair screws with nuts for securing parts together without material damage. Machine screws may feature a number of head types that pair with specific screwdrivers and bits, common options including hex, Philips, and Torx designs.

Self-Tapping Screws

Self-tapping screws are a type that is designed to cut their own threads as they are driven into materials, eliminating the need for creating a pre-tapped hole. This makes them ideal for applications where upholding speed and efficiency is necessary, such as in the assembly of sheet metal, plastics, and wood, as well as where avoiding additional tool or equipment purchases is beneficial. Furthermore, the ability to create threads as they are installed makes self-tapping screws particularly valuable in situations where access to the backside of a material is limited.

Set Screws

Set screws are a specialized type that is primarily relied on in applications to secure an object within or against another object, an example being the fastening of a gear or pulley to a shaft. These screws are typically headless and feature a threaded point that is driven into a pre-tapped hole to create a strong and secure joint. Set screws are commonly used for torque transmission, where they prevent relative motion between two parts by exerting pressure against mating surfaces. Being able to hold components in place without a nut makes set screws an essential component in many mechanical assemblies, especially where there is not feasible room for the nut.

Shoulder Screws

Shoulder screws, also known as shoulder bolts, are characterized by a smooth, unthreaded section that exists between the head and the threaded portion of the screw. This design allows for rotational movement of an assembled part around the fastener’s shoulder, making this choice ideal for use as pivot points, axles, or guides in mechanical assemblies. Moreover, the precise dimensions of the shoulder ensure that the screw fits snugly into its mating part, providing accurate alignment and smooth operation.

Flange Screws

Flange screws are distinguished by the flange or washer-like base that is integrated into the head of the fastener. This helps to distribute the load of the fastener over a larger area, diminishing the risk of damage to the material being secured. Flange screws are often employed in automotive and construction applications, where their ability to withstand high loads and resist loosening under vibration makes them a reliable choice for critical connections. The built-in flange also eliminates the need for a separate washer, simplifying the assembly process and reducing the number of components required.

SEMS Screws

SEMS screws come pre-assembled with one or more washers, creating a convenient, one-piece solution for many fastening applications. The combination of both elements in a single unit saves time during assembly while having the added benefit of ensuring that the washer is always in the correct position for optimal protection. SEMS screws are commonly used in electronics assembly and other various high-volume manufacturing environments, where their pre-assembled nature optimizes installation and reduces the risk of losing small parts.

Conclusion

Whether you need a standard machine screw for an electronics assembly or a specialized aerospace screw for a critical torque transmission application, choose The Industrial Fasteners. Here, we provide competitive pricing options on over 2 billion product listings, all of which are readily available for purchase today on our website. Once you are ready to initiate procurement with us, get in touch with our staff to request a quote, or submit a completed RFQ form through our website. With your offered information, our team will quickly formulate the most fitting procurement options for you. We are also able to handle pressing time constraints or other rigorous requirements, our staff being just a call or email away from providing consultation and service.