S-90910A494 1/4"-20 x 1 3/4" 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 for extended service life in harsh industrial environments
• Maximum torque transmission through Torx Plus IP27 drive system, reducing cam-out and tool wear during high-torque applications
• Precise thread engagement with Class 3A UNC coarse threads ensuring reliable fastening and vibration resistance
• Exceptional mechanical strength with 120,000 PSI tensile rating and Rockwell C39 hardness for heavy-duty applications
• Full thread coverage along the 1 3/4" length provides maximum grip and load distribution
• Rounded button head design offers a low-profile finish while maintaining high clamping force
• Comprehensive compliance with ASME B18.3, ASTM F835, RoHS 3, and REACH standards for guaranteed quality and safety

Professional Applications & Engineering Value

This high-strength rounded head screw delivers exceptional performance in demanding industrial applications where reliability is critical. The zinc-plated alloy steel construction provides superior corrosion protection for machinery, equipment assemblies, and structural components exposed to challenging environments. The Torx Plus IP27 drive system eliminates cam-out issues common in high-torque applications, ensuring secure fastening in automotive, manufacturing, and construction settings. With Class 3A UNC coarse threads and full threading along the 1 3/4" length, these screws provide maximum engagement and vibration resistance in heavy machinery, industrial equipment, and structural frameworks. The combination of 120,000 PSI tensile strength and Rockwell C39 hardness makes these fasteners ideal for applications requiring repeated disassembly and reassembly without performance degradation.

Specification Summary & Compliance

This 1/4-20 x 1 3/4" rounded head screw features precision Class 3A thread fit with UNC coarse threading (20 threads per inch) for optimal engagement and reliability. Manufactured to exacting standards including ASME B18.3 and ASTM F835 specifications, ensuring dimensional accuracy and performance consistency. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, meeting the latest environmental and safety requirements for industrial applications worldwide.