S-92991A574 5/16"-18 x 1/4" ASME B18.3 Set Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance thanks to brass construction, ideal for harsh environments and preventing rust-related failures
• Exceptional thread precision and reliability with Class 3A fit, ensuring tight, secure fastening and reduced risk of loosening
• High mechanical strength and durability from Rockwell B55 hardness, providing excellent resistance to wear and deformation
• Secure, flush mounting with its headless design and cup tip, preventing protrusion and offering positive seating
• Easy installation and removal using the 5/32" hex drive, allowing for high torque application in confined spaces
• Broad compatibility with 5/16"-18 UNC coarse threads, making it suitable for a wide range of standard industrial applications
• Full regulatory compliance with ASME B18.3, RoHS 3, and REACH, ensuring safety and environmental standards are met

Professional Applications & Engineering Value

This brass set screw is engineered to address critical challenges in precision assemblies where corrosion resistance, dimensional stability, and reliable clamping force are paramount. The headless design with a cup tip ensures a flush finish, eliminating interference in compact machinery and rotating components. Its 5/16"-18 UNC coarse threads and Class 3A thread fit provide superior holding power, reducing the risk of vibration-induced loosening in demanding applications such as motor shafts, gears, and precision instruments. The hex drive allows for high torque application, ensuring secure fastening even in hard-to-reach areas. Made from brass, it naturally resists galvanic corrosion, making it an excellent choice for electrical components, marine environments, and plumbing systems where non-sparking and non-magnetic properties are beneficial.

Specification Summary & Compliance

This set screw adheres to ASME B18.3 specifications, ensuring dimensional accuracy and performance reliability. The Class 3A thread fit provides a precise, high-quality thread engagement for superior fastening. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006), confirming its safety for use in regulated industries and commitment to environmental standards. Manufactured with a Rockwell B55 hardness, it meets the mechanical demands of industrial applications while maintaining excellent machinability and durability.