S-91512A140 6-32 x 1/2" Left-Hand-Thread Stainless Steel Hex-Drive Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction and passivated finish, ideal for harsh industrial environments
• Exceptional thread engagement with Class 3A fit and UNC coarse threads ensuring reliable fastening in demanding applications
• High mechanical strength with 70,000 psi tensile strength and Rockwell B70 hardness for long-lasting performance under stress
• Secure left-hand threading providing counter-rotational security in applications where standard right-hand threads may loosen
• Flush mounting capability with standard 82° countersink angle and flat head design for smooth surface finishes
• Easy installation with 5/64" hex drive allowing for efficient torque application and reduced assembly time
• Full regulatory compliance meeting RoHS 3 and REACH standards for safe use across various industries

Professional Applications & Engineering Value

These 6-32 UNC left hand thread flat head screws deliver critical engineering solutions where reverse-thread security is paramount. The 18-8 stainless steel composition combined with passivated finish provides exceptional protection against corrosion in challenging environments including marine, chemical processing, and outdoor applications. The Class 3A thread fit ensures precise engagement with mating components, reducing the risk of cross-threading while the left-hand threading prevents unintentional loosening in rotating machinery and specialized equipment. The 82° countersink angle and flat head profile enable flush mounting in precision assemblies where surface continuity is essential. These fully threaded screws with coarse UNC threading offer superior holding power in various materials, making them ideal for maintenance, repair, and OEM applications requiring reliable reverse-thread fastening solutions.

Specification Summary & Compliance

Manufactured to precise dimensional standards with Class 3A thread fit and UNC coarse thread specifications. Features include 6-32 thread size, 1/2" length, 0.138" thread diameter, and standard flat head profile with 82° countersink angle. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and regulatory adherence for industrial applications worldwide.