S-92991A148 1/2"-13 x 1 1/2" ASME B18.3 Set Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance from high-quality brass material, ideal for harsh environments and preventing rust-related failures.
• Exceptional thread engagement and vibration resistance due to the precise Class 3A thread fit, ensuring a secure and long-lasting hold.
• High torque application capability with the 1/4" hex drive, allowing for easy and secure installation with standard tools.
• Effective locking and minimal surface marring provided by the cup point tip, which bites into the shaft for a reliable, semi-permanent fixture.
• Reliable mechanical strength and durability backed by a Rockwell B55 hardness, resisting wear and deformation under load.
• Broad compatibility and interchangeability with 1/2"-13 UNC coarse threads, a common standard in North American inch-system machinery.
• Guaranteed safety and environmental compliance, meeting ASME B18.3 specifications and being RoHS 3 & REACH compliant for global use.

Professional Applications & Engineering Value

This 1/2"-13 UNC brass set screw is engineered to solve critical challenges in assembly and maintenance. The headless design and cup point create a flush, high-grip connection perfect for securing collars, gears, and pulleys on shafts without protruding, reducing the risk of snagging or interference in compact machinery. The Class 3A thread fit provides a tighter tolerance than standard fits, significantly enhancing vibration resistance in dynamic systems like motors, conveyors, and powertrains. Manufactured from brass, it offers inherent corrosion resistance, making it a superior choice for applications exposed to moisture, chemicals, or electrical components where non-magnetic and non-sparking properties are vital. This combination of precision, material integrity, and a 1/4" hex drive for high-torque installation delivers reliable performance in demanding industrial set screw applications, from heavy equipment to precision instruments.

Specification Summary & Compliance

This set screw adheres to stringent dimensional and performance standards. The thread system is 1/2"-13 UNC with coarse spacing and a high-precision Class 3A thread fit for superior engagement. It is manufactured in compliance with the ASME B18.3 specification, ensuring dimensional accuracy and interchangeability. The product is confirmed to be RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting the latest environmental and safety regulations for hazardous substances.