S-92991A129 1/4"-28 x 1/2" ASME B18.3 Set Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance due to brass material, ideal for harsh or moist industrial environments.
• Exceptional thread engagement and vibration resistance provided by the Class 3A UNF fine thread fit for reliable, long-term fastening.
• High holding power and minimal surface damage from the cup point tip, engineered with Rockwell B55 hardness for secure component positioning.
• Easy installation and removal in confined spaces with the headless design and 1/8" hex drive, requiring only a standard hex key.
• Precision manufacturing compliance with ASME B18.3 standards ensures consistent quality and dimensional accuracy for industrial use.
• Safe for regulated industries as it is RoHS 3 and REACH compliant, meeting strict environmental and health standards.
• Versatile right-hand thread application for standard assembly processes in machinery, electronics, and precision equipment.

Professional Applications & Engineering Value

This brass set screw is engineered to address common industrial challenges such as component slippage, corrosion, and assembly inefficiency. The Class 3A thread fit and UNF fine threads deliver maximum clamping force and vibration resistance, crucial for precision machinery and automotive assemblies. The headless design with a 1/8" hex drive allows for flush mounting and easy access in tight spaces, reducing installation time. Made from durable brass, it resists rust and galvanic corrosion, making it suitable for electrical enclosures, marine equipment, and plumbing systems. The cup point tip with Rockwell B55 hardness ensures strong bite into shafts and hubs without causing excessive damage, providing reliable positioning in high-stress applications. This combination of features offers a robust solution for engineers seeking longevity and compliance in industrial fasteners.

Specification Summary & Compliance

This set screw adheres to precise dimensional standards, including a Class 3A thread fit for tight tolerances and a 1/4"-28 UNF fine thread with right-hand direction. It meets ASME B18.3 specifications for consistent manufacturing quality. Additionally, it is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free from hazardous substances and safe for various industrial and consumer applications.