S-91385A360 5/16"-24 x 3/8" ASME B18.3, ASTM F912 Set Screws

Key Features & Benefits at a Glance

• Superior vibration resistance with nylon patch thread locker that maintains integrity from -50°F to 250°F
• Exceptional holding power through Class 3A thread fit precision and cup point design for maximum grip
• Long-term corrosion protection with black-oxide finish on alloy steel construction
• High-strength performance backed by Rockwell C45 hardness rating for heavy-duty applications
• Secure installation control with 5/32" hex drive in headless design for flush mounting
• Reliable fine thread engagement through 5/16"-24 UNF specification for precise adjustment
• Industry compliance assurance meeting ASME B18.3, ASTM F912, RoHS 3, and REACH standards

Professional Applications & Engineering Value

This black-oxide alloy steel set screw delivers critical vibration resistance in demanding industrial environments where loosening under dynamic loads compromises safety and performance. The nylon patch thread locker provides consistent locking force across temperature extremes from -50°F to 250°F, eliminating the need for secondary locking mechanisms. Engineered with UNF fine threads and Class 3A fit, it ensures precise positioning in collars, gears, and pulleys while the cup point creates permanent seating in shaft applications. The headless design with hex drive allows flush installation in confined spaces, making it ideal for precision machinery, automotive components, and manufacturing equipment requiring reliable, maintenance-free fastening solutions.

Specification Summary & Compliance

Manufactured to Class 3A thread tolerance with 5/16"-24 UNF fine thread specification and 5/32" hex drive. Complies with ASME B18.3 dimensional standards and ASTM F912 material specifications. Meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental compliance requirements. Features Rockwell C45 hardness and black-oxide surface treatment for enhanced durability and corrosion resistance.