S-99926A148 5/16"-18 x 1" 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 longevity in harsh industrial environments.
• High tensile strength of 70,000 psi combined with Rockwell B70 hardness provides reliable, heavy-duty fastening for demanding applications.
• Precise Class 3A thread fit guarantees tight tolerances and secure mating, reducing the risk of loosening under vibration.
• Hex drive design (5/32") allows for easy installation and high torque application, minimizing tool slippage and damage.
• Undercut flat head with 100° countersink angle ensures a flush, low-profile finish that enhances aesthetics and prevents snagging.
• Coarse UNC threading and partial threading enable quick assembly and optimal grip in various materials, improving efficiency.
• Compliance with RoHS 3 and REACH standards ensures environmental safety and regulatory adherence for global supply chains.

Professional Applications & Engineering Value

Engineered for industrial reliability, these 5/16"-18 UNC flat head screws address common fastening challenges such as corrosion, vibration, and high-stress loads. The 18-8 stainless steel material and passivated finish provide exceptional resistance to rust and chemicals, making them ideal for machinery, automotive, and outdoor equipment. The hex drive and Class 3A thread fit ensure precise installation and sustained integrity in dynamic environments, while the undercut flat head offers a seamless fit that reduces protrusion risks. Suitable for assembly lines and maintenance operations, these screws deliver consistent performance where durability and compliance with RoHS and REACH are critical.

Specification Summary & Compliance

This screw adheres to UNC coarse thread standards with a Class 3A thread fit for high precision. Dimensions include a thread size of 5/16"-18, length of 1", and head diameter of 0.656". It features a right-hand thread direction and is partially threaded with a minimum thread length of 0.82". Manufactured in accordance with industry norms, it is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring safe and sustainable use.