S-90910A493 1/4"-20 x 5/8" ASME B18.3, ASTM F835 Steel Button Head Torx Plus Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with zinc-plated alloy steel construction, extending service life in harsh industrial environments
• Maximum torque transmission and reduced cam-out with Torx Plus IP27 drive for secure fastening and minimal tool wear
• Exceptional load-bearing capacity with 120,000 psi tensile strength and Rockwell C39 hardness for demanding applications
• Reliable thread engagement and vibration resistance through Class 3A thread fit and UNC coarse threading
• Streamlined assembly process with fully threaded design and rounded button head for flush mounting and easy installation
• Enhanced workplace safety and compliance by meeting ASME B18.3 standards and environmental regulations (RoHS 3, REACH)
• Versatile industrial compatibility with 1/4"-20 thread size and 5/8" length suitable for various machinery and equipment

Professional Applications & Engineering Value

Engineered for high-stress industrial assemblies, this zinc-plated alloy steel screw addresses critical challenges like vibration loosening and corrosion-induced failure. The Torx Plus IP27 drive ensures precise torque application, preventing strip-out in repetitive disassembly scenarios common in maintenance-heavy sectors. With its Class 3A thread fit and UNC coarse threading, it maintains consistent clamping force in machinery, automotive, and electrical enclosures where right-hand threaded fasteners are standard. The rounded button head profile offers a low-profile finish, reducing snag risks while providing ample bearing surface. Ideal for OEMs and MRO specialists seeking ASME B18.3 compliant solutions that balance durability with regulatory adherence.

Specification Summary & Compliance

This screw maintains precision Class 3A thread tolerances with UNC coarse threads (1/4"-20) and a 5/8" fully threaded length. Manufactured to ASME B18.3 specifications (ASTM F835), it guarantees dimensional consistency. The product is verified RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliant, ensuring adherence to hazardous substance restrictions and environmental safety protocols.