S-91440A632 1/4"-20 x 1 3/4" ASME B18.6.3 Steel Round Head Combination Phillips/Slotted Screws

Key Features & Benefits at a Glance

• Enhanced corrosion resistance with zinc-plated steel construction for long-lasting performance in demanding environments
• Superior installation flexibility with combined Phillips/Slotted drive (No. 3 size) allowing use with multiple tool types
• Exceptional mechanical strength from Rockwell B70 hardness rating, ensuring reliable load-bearing capacity
• Optimized thread engagement through UNC coarse threading and Class 2A fit for secure fastening and vibration resistance
• Full-length threading provides maximum grip along the entire 1 3/4" shaft for superior holding power
• Standard-compliant reliability meeting ASME B18.6.3 specifications for consistent quality and interchangeability
• Environmental compliance with RoHS 3 and REACH regulations for safe use in regulated industries

Professional Applications & Engineering Value

This zinc-plated steel rounded head screw delivers critical performance advantages for industrial assembly applications where corrosion resistance and mechanical strength are paramount. The combination of UNC coarse threading and Class 2A thread fit ensures rapid installation with excellent vibration resistance, making it ideal for machinery, equipment manufacturing, and structural assemblies. The rounded head profile with dual Phillips/Slotted drive options provides installation versatility while maintaining a low-profile appearance. With full threading along its 1 3/4" length, this fastener maximizes thread engagement in thick materials, delivering superior clamping force and preventing loosening under dynamic loads. The Rockwell B70 hardness rating guarantees durability in high-stress applications, while the zinc plating protects against environmental degradation in industrial settings.

Specification Summary & Compliance

This 1/4"-20 x 1 3/4" screw features precise Class 2A thread fit tolerances with UNC coarse threading (20 threads per inch) and right-hand thread direction. Manufacturing complies with ASME B18.6.3 standards for dimensional accuracy and performance. The product is fully RoHS 3 (2015/863/EU) compliant and REACH (EC 1907/2006) compliant, meeting current environmental regulations for hazardous substances. The fastener is fully threaded with a standard rounded head profile measuring 0.472" diameter and 0.175" height, engineered for consistent performance in industrial applications.