S-94518A615 5/16"-18 x 3/4" QQ-P-35, MS24671-40 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.
• High tensile strength of 70,000 psi ensures reliable performance and durability under demanding loads.
• Precise Class 3A thread fit provides excellent engagement and vibration resistance in assemblies.
• Efficient hex drive design allows for quick installation and high torque application without cam-out.
• Standard 82° countersink angle enables a flush, professional finish in countersunk holes.
• Full threading along the 3/4" length offers maximum grip and holding power in various materials.
• Compliance with RoHS 3 and REACH ensures environmental safety and regulatory acceptance in global markets.

Professional Applications & Engineering Value

This 5/16"-18 UNC flat head screw is engineered to solve critical fastening challenges in industrial and manufacturing settings. The 18-8 stainless steel material combined with a passivated finish provides exceptional resistance to rust and chemical exposure, making it suitable for outdoor equipment, marine applications, and food processing machinery. Its coarse UNC threading and Class 3A thread fit ensure quick assembly and secure fastening in metals and plastics, reducing the risk of loosening under vibration. The hex drive design facilitates easy installation in tight spaces, while the flat head with an 82° countersink creates a smooth, aerodynamic surface—ideal for automotive panels, aerospace components, and machinery where protrusion is not acceptable. This screw delivers reliable performance, streamlining production and minimizing maintenance in high-stress environments.

Specification Summary & Compliance

This screw adheres to UNC coarse thread standards with a precise Class 3A thread fit for optimal dimensional accuracy. It meets Fed. Spec. QQ-P-35 (MS24671-40) for material and manufacturing quality, ensuring consistency in industrial applications. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, it supports environmental and safety standards for global use.