S-98164A519 1/4"-20 x 7/8" ASME B18.3, ASTM F879 Stainless Steel Button Head Hex-Drive Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance in harsh environments thanks to 316 stainless steel construction with passivated finish
• Exceptional mechanical strength with 70,000 psi tensile strength and Rockwell B55 hardness for heavy-duty applications
• Precise thread engagement ensured by Class 3A UNC coarse threads for reliable fastening in industrial assemblies
• Easy installation and removal with 5/32" hex drive and rounded button head design requiring minimal clearance
• Full-length threading provides consistent grip along the entire 7/8" length for maximum holding power
• Compliance with major industry standards including ASME B18.3, RoHS 3, and REACH for quality assurance
• Right-hand thread direction offers standard operation compatibility across various equipment and machinery

Professional Applications & Engineering Value

These 316 stainless steel rounded head screws deliver critical performance advantages in demanding industrial environments where corrosion resistance and mechanical reliability are paramount. The combination of UNC coarse threads and Class 3A thread fit ensures rapid assembly with superior vibration resistance, making them ideal for machinery, marine equipment, chemical processing systems, and food processing applications. The passivated finish enhances the natural corrosion resistance of 316 stainless steel, while the hex drive and rounded button head design provide secure tool engagement with a low-profile appearance. With 70,000 psi tensile strength and full threading, these screws maintain structural integrity under significant loads, solving common fastening failures in corrosive or high-stress applications.

Specification Summary & Compliance

This 1/4"-20 x 7/8" screw features precision UNC coarse threads with Class 3A fit for optimal engagement and meets ASME B18.3 dimensional specifications. Manufacturing complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across various industrial sectors. The fully threaded design maintains consistent performance throughout the fastener length, while the right-hand thread direction and 5/32" hex drive provide standard installation compatibility.