S-90393A118 5/16"-18 x 1 1/4" IFI 111, SAE J429 Medium-Strength Grade 5 Steel Serrated-Flange Hex Head Screws

Key Features & Benefits at a Glance

• High tensile strength of 120,000 psi ensures reliable performance in demanding applications, reducing the risk of fastener failure under load.
• Grade 5 classification provides consistent quality and durability, ideal for general-purpose and automotive uses where strength is critical.
• Coarse UNC threading with Class 2A fit allows for quick assembly and resistance to vibration loosening in various materials.
• Flanged hex head design eliminates the need for a separate washer, distributing clamp load evenly and speeding up installation.
• External hex drive offers high torque capability for secure tightening with common tools, enhancing efficiency in maintenance and production.
• Full threading along the 1 1/4" length ensures maximum grip and adjustability in diverse joint configurations.
• RoHS 3 and REACH compliance guarantees environmental safety and regulatory adherence for global industrial supply chains.

Professional Applications & Engineering Value

This Grade 5 hex head screw is engineered to address common industrial challenges such as vibration-induced loosening and high-stress fatigue. Its coarse UNC thread and Class 2A fit provide excellent engagement in metals and plastics, minimizing cross-threading risks during assembly. The flanged design enhances stability by increasing the bearing surface, which is crucial for machinery, automotive frames, and structural assemblies where even load distribution is vital. Made to IFI 111/SAE J429 specifications, it ensures interoperability and reliability in OEM and MRO applications, supported by a Rockwell C22 hardness that resists wear and corrosion in harsh environments. Ideal for construction, equipment manufacturing, and automotive sectors, this screw delivers consistent performance while meeting stringent RoHS and REACH standards for sustainable operations.

Specification Summary & Compliance

This screw features a 5/16"-18 UNC thread with Class 2A tolerance for precise fit, a length of 1 1/4", and full threading for versatile use. It complies with IFI 111 SAE J429 for mechanical properties and dimensional standards. Additionally, it is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, ensuring adherence to environmental and safety regulations without hazardous substances.