S-94518A519 1/4"-20 x 5/8" QQ-P-35, MS24671-29 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, ensuring long-term reliability in harsh environments.
• High-strength performance offering 70,000 psi tensile strength for secure, durable fastening in demanding industrial applications.
• Precise Class 3A thread fit provides tighter tolerances and improved assembly accuracy, reducing the risk of loosening or failure.
• Efficient hex drive design (5/32") allows for quick installation and high torque application, minimizing assembly time and labor costs.
• Optimized flat head profile with 82° countersink angle ensures a flush, low-profile finish that enhances safety and aesthetics.
• Full threading along the 5/8" length maximizes grip and load distribution, ideal for varied material thicknesses.
• Compliance with stringent standards including Fed. Spec. QQ-P-35 (MS24671-29), RoHS 3, and REACH, ensuring environmental and regulatory safety.

Professional Applications & Engineering Value

These 1/4-20 UNC flat head screws are engineered to address critical industrial fastening challenges, such as vibration resistance and corrosion in machinery, automotive, and construction sectors. The 18-8 stainless steel material and passivated finish provide exceptional durability against moisture and chemicals, reducing maintenance needs. With a coarse thread spacing and Class 3A thread fit, they ensure rapid installation and reliable holding power in metals and composites. The hex drive style facilitates high-torque applications, making them ideal for assembly lines where efficiency and strength are paramount. By integrating fully threaded design and standardized dimensions, these screws deliver consistent performance in OEM and MRO environments, enhancing project timelines and operational safety.

Specification Summary & Compliance

This product adheres to precise dimensional standards, including Class 3A thread fit for superior accuracy and UNC coarse threads for robust engagement. It meets Fed. Spec. QQ-P-35 (MS24671-29) for quality assurance and is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material integrity. The specifications cover a 5/8" length, 1/4"-20 thread size, and 82° countersink angle, supporting reliable integration in various industrial fastening systems.