S-90279A539 1/4"-20 x 5/8" ASME B18.6.3 Steel Round Head Phillips Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with zinc-plated steel construction, extending service life in demanding environments
• High tensile strength of 60,000 psi ensures reliable fastening under substantial mechanical loads
• Rockwell B69 hardness provides excellent durability and resistance to wear and deformation
• Quick installation and removal with Phillips No. 3 drive and fully threaded UNC coarse thread design
• Precise thread fit (Class 2A) guarantees consistent engagement and reduces cross-threading risks
• Rounded head profile offers a finished appearance and minimizes snagging in assembled products
• Compliance with ASME B18.6.3, RoHS 3, and REACH ensures quality, safety, and environmental standards are met

Professional Applications & Engineering Value

Engineered for robust performance, these zinc-plated steel rounded head screws address critical industrial needs by combining high tensile strength and corrosion resistance. The UNC coarse thread and Class 2A fit facilitate rapid assembly in materials like metal and hardwood, reducing installation time while maintaining secure connections. With a Phillips drive and fully threaded design, they provide uniform clamping force, ideal for machinery, electrical enclosures, and automotive components where vibration resistance and longevity are paramount. Their compliance with ASME B18.6.3 and environmental regulations makes them a trusted choice for OEMs and maintenance teams seeking reliable industrial fasteners.

Specification Summary & Compliance

This screw features a 1/4"-20 UNC coarse thread with Class 2A tolerance for precise fit, a length of 5/8", and a Rockwell B69 hardness. It is manufactured to meet ASME B18.6.3 specifications and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006), ensuring adherence to industry and environmental standards for safe, high-performance use.