S-91385A621 3/8"-16 x 5/8" ASME B18.3, ASTM F912 Set Screws
Set Screws
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Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
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Key Features & Benefits at a Glance
- Permanent vibration resistance with integrated Nylon Patch thread locker that prevents loosening under extreme conditions
- Exceptional temperature durability from -50°F to 250°F for reliable performance in fluctuating industrial environments
- Superior material strength from Black-Oxide Alloy Steel with Rockwell C45 hardness for long-lasting, wear-resistant fastening
- Precise thread engagement with UNC Class 3A coarse threads ensuring secure fits and reduced cross-threading risks
- Easy installation and removal using a standard 3/16" hex drive, ideal for confined spaces with its headless design
- Enhanced grip and alignment with cup tip design that minimizes surface damage while maintaining holding power
- Broad regulatory compliance meeting ASME B18.3, ASTM F912, RoHS 3, and REACH standards for global industrial use
Professional Applications & Engineering Value
This Black-Oxide Alloy Steel set screw delivers critical engineering solutions where vibration-induced loosening compromises assembly integrity. The permanent Nylon Patch thread locker technology creates consistent friction along the UNC Class 3A coarse threads, effectively resisting rotational forces in high-stress environments like heavy machinery, automotive systems, and power transmission equipment. The headless design with hex drive allows flush mounting in tight spaces while the cup tip concentrates clamping force without damaging shaft surfaces. With operating temperatures from -50°F to 250°F and Rockwell C45 hardness, it maintains reliable performance in both extreme cold and industrial heat cycles, making it ideal for permanent installations requiring zero maintenance.
Specification Summary & Compliance
This set screw features 3/8"-16 UNC coarse threads with precision Class 3A fit for superior thread engagement and dimensional accuracy. Manufactured to ASME B18.3 specifications and ASTM F912 standards, it ensures consistent quality and performance. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, meeting global environmental and safety requirements for industrial components.
