S-99934A840 5/16"-18 x 3/4" ASME B18.3 Set Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction, ideal for harsh industrial environments
• Exceptional thread engagement and holding power provided by Class 3A thread fit for secure, vibration-resistant fastening
• High durability and wear resistance from Rockwell B80 hardness, ensuring long service life under mechanical stress
• Easy installation and removal with 5/32" hex drive design, allowing for efficient assembly and maintenance
• Reliable soft-tip performance with silver tip material that minimizes damage to shaft surfaces during clamping
• Broad compatibility with UNC coarse threads (5/16"-18) for quick assembly in various industrial applications
• Headless, space-saving design that fits flush in assemblies where protruding fasteners are not feasible

Professional Applications & Engineering Value

This 5/16"-18 UNC set screw delivers critical engineering value in applications requiring precise component positioning and secure shaft retention. Manufactured from 18-8 stainless steel, it resists corrosion in demanding environments like outdoor machinery, food processing equipment, and marine components. The Class 3A thread fit and coarse UNC threads ensure rapid installation and high vibration resistance, preventing loosening in dynamic systems such as motor pulleys, gear assemblies, and rotating shafts. The headless design and silver soft tip protect adjacent surfaces from galling while providing flush mounting in tight spaces. These features make it an optimal choice for OEMs and maintenance teams seeking reliable, long-term fastening solutions that reduce downtime and maintenance costs.

Specification Summary & Compliance

This set screw adheres to ASME B18.3 specifications, ensuring dimensional accuracy and performance reliability. Thread specifications include 5/16"-18 UNC coarse threads with a Class 3A thread fit for precise tolerances. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its suitability for use in environmentally sensitive and global industrial markets.