S-90275A130 5-40 x 5/8" ASME B18.6.3 Steel Slotted Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with zinc-plated steel construction, extending service life in demanding industrial environments
• Exceptional mechanical strength with 60,000 psi tensile strength and Rockwell B70 hardness for reliable load-bearing performance
• Precision thread engagement with Class 2A UNC coarse threads ensuring consistent fastening and vibration resistance
• Optimized flush mounting featuring standard 82° countersink angle for seamless surface integration and reduced snagging
• Full-threaded design providing maximum grip length and uniform stress distribution across the entire fastener
• Industry-standard compliance meeting ASME B18.6.3 specifications for dimensional accuracy and interchangeability
• Environmental responsibility with RoHS 3 and REACH compliance for safe use in regulated applications

Professional Applications & Engineering Value

Engineered for precision fastening in industrial assemblies, these 5-40 UNC flat head slotted screws deliver critical performance advantages. The zinc-plated steel construction provides essential corrosion protection for machinery, electrical enclosures, and automotive components exposed to harsh conditions. With fully threaded design and Class 2A thread fit, these fasteners maintain consistent clamping force in vibration-prone applications. The standard 82° countersink angle ensures flush mounting in precision-machined surfaces, eliminating protrusions that could interfere with moving parts. These slotted drive screws offer reliable manual installation in confined spaces where power tools cannot access, making them ideal for maintenance, repair, and OEM assembly operations requiring dependable right-hand thread fasteners.

Specification Summary & Compliance

This 5-40 UNC flat head screw maintains precise Class 2A thread fit tolerances per ASME B18.6.3 specifications, ensuring dimensional accuracy and interchangeability. The coarse thread spacing provides rapid installation while the standard flat head profile with 82° countersink angle guarantees proper seating. Manufacturing compliance includes full adherence to ASME B18.6.3 standards for dimensional requirements, along with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations for hazardous substance restrictions.