S-92991A215 1/4"-20 x 5/16" ASME B18.3 Set Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance due to durable brass construction, ideal for harsh environments and extending component lifespan.
• Exceptional thread engagement and holding power provided by the Class 3A fit and coarse UNC thread, ensuring a secure, vibration-resistant connection.
• High-strength performance with a Rockwell B55 hardness, offering reliable durability under load without deforming.
• Secure and flush installation enabled by the headless design and 1/8" hex drive, perfect for confined spaces and providing a clean finish.
• Enhanced grip and minimal surface damage from the cup point tip, which bites into the shaft for superior torque transmission.
• Guaranteed quality and safety through compliance with ASME B18.3, RoHS 3, and REACH standards, ensuring material and performance reliability.
• Broad industrial compatibility with the standard 1/4"-20 right-hand thread, making it a versatile choice for various assembly applications.

Professional Applications & Engineering Value

This brass set screw is engineered to address critical challenges in precision assembly, such as loosening under vibration and corrosion in demanding conditions. The UNC coarse thread and Class 3A fit provide a tight, reliable hold that resists back-out, while the cup point design ensures maximum grip on shafts and collars without causing excessive damage. Manufactured from brass with a Rockwell B55 hardness, it offers an optimal balance of strength and corrosion resistance, making it ideal for industrial applications in machinery, electrical components, and marine environments where non-magnetic, non-sparking properties are essential. Its headless and hex drive configuration allows for easy installation in tight spaces, providing a secure and permanent fastening solution that maintains alignment and torque integrity.

Specification Summary & Compliance

This set screw adheres to precise dimensional standards with a 1/4"-20 UNC coarse thread and Class 3A thread fit for high precision. It is manufactured in compliance with the ASME B18.3 specification, ensuring consistent quality and performance. The product is also RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, confirming it meets stringent environmental and safety regulations for hazardous substances.