S-90251A620 3/8"-16 x 5/8" ASME B18.3 Set Screws

Key Features & Benefits at a Glance

• Vibration-resistant locking with permanent nylon patch that maintains secure fastening even under continuous stress
• Superior corrosion resistance from 18-8 stainless steel construction for extended service life in harsh environments
• Precise thread engagement with Class 3A fit ensuring reliable performance in critical applications
• Wide temperature tolerance from -50° to 250°F allowing consistent performance across diverse operating conditions
• Enhanced installation control through hex drive design providing positive torque application
• Optimized holding power with cup tip design that creates secure contact points on shaft surfaces
• Industry compliance assurance meeting ASME B18.3 standards and environmental regulations

Professional Applications & Engineering Value

This 3/8"-16 UNC hex headless set screw delivers exceptional engineering value in demanding industrial applications where vibration resistance and permanent positioning are critical. The nylon patch thread locker provides chemical-free locking that won't degrade over time, solving common loosening problems in machinery, automotive components, and power transmission systems. Manufactured from 18-8 stainless steel with Rockwell B80 hardness, it maintains structural integrity while resisting corrosion in outdoor, marine, or chemical exposure environments. The coarse thread spacing and Class 3A thread fit ensure rapid installation with minimal cross-threading risk, while the cup tip design maximizes gripping force on shafts and collars without damaging surfaces. Ideal for permanent assembly applications requiring reliable, maintenance-free performance.

Specification Summary & Compliance

This set screw features 3/8"-16 UNC coarse threads with precision Class 3A thread fit for superior engagement and load distribution. The 5/8" length provides optimal fastening depth for various applications. Manufacturing complies with ASME B18.3 specifications for dimensional accuracy and performance. Environmental compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring safe use across global markets. The nylon patch thread locker maintains effectiveness across the specified temperature range of -50° to 250°F without compromising the material's corrosion resistance properties.