S-90124A313 1/4"-20 x 3/4" ASME B18.2.1, SAE J429 Steel Wire-Lockable Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 120,000 psi ensures reliable performance under high-stress conditions, reducing failure risks in demanding applications.
• Durable black-oxide steel construction provides enhanced corrosion resistance, extending service life in harsh industrial environments.
• Grade 5 classification and Rockwell C25 hardness deliver consistent mechanical properties for predictable load-bearing and vibration resistance.
• UNC coarse threading with Class 2A fit allows for quicker assembly and easier alignment, improving installation efficiency.
• Fully threaded design maximizes grip and clamping force along the entire length, enhancing joint stability.
• External hex drive and hex head enable secure tool engagement and high torque application, minimizing stripping and slippage.
• Compliance with ASME B18.2.1 and RoHS 3 ensures adherence to industry standards and environmental regulations, supporting quality and safety.

Professional Applications & Engineering Value

Engineered for industrial and construction settings, these Grade 5 black-oxide steel hex head screws address critical challenges like vibration loosening and corrosion. The UNC coarse thread design facilitates rapid installation in materials where fine threads might be prone to cross-threading, while the fully threaded shank distributes stress evenly to prevent joint failure. With a high tensile strength of 120,000 psi and Rockwell C25 hardness, they withstand heavy loads and repetitive stress in machinery, automotive assemblies, and structural frameworks. The black-oxide finish adds a protective layer against moisture and chemicals, making them ideal for outdoor or corrosive environments. These screws are a dependable choice for engineers seeking ASME B18.2.1-compliant fasteners that combine durability with ease of use in right-hand thread applications.

Specification Summary & Compliance

This screw features precise UNC coarse threading with Class 2A fit, ensuring standard-compliant dimensions for reliable interchangeability. It adheres to ASME B18.2.1 and SAE J429 specifications, confirming manufacturing consistency and performance benchmarks. Additionally, it is RoHS 3 (2015/863/EU) compliant, meeting environmental regulations for restricted substances.