S-90275A125 5-40 x 5/16" ASME B18.6.3 Steel Slotted Flat Head Screws
Steel Slotted Flat Head Screws
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Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
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Key Features & Benefits at a Glance
- Superior corrosion resistance with zinc-plated steel construction for extended service life in demanding 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 fit and UNC coarse threads ensuring secure fastening and vibration resistance
- Optimized flush mounting with standard 82° countersink angle for seamless surface integration in industrial assemblies
- 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
These 5-40 UNC flat head slotted screws deliver critical engineering solutions where surface flushness and structural integrity are paramount. The zinc-plated steel construction provides essential corrosion protection for machinery, electrical enclosures, and automotive components exposed to harsh operating conditions. With coarse UNC threads and Class 2A thread fit, these fasteners offer superior resistance to vibration loosening while maintaining easy installation in various materials. The standard 82° countersink angle ensures perfect seating in precision-machined components, eliminating protrusions that could interfere with moving parts or compromise aesthetic requirements. Ideal for industrial assembly lines, maintenance operations, and OEM equipment manufacturing where reliability and regulatory compliance are non-negotiable.
Specification Summary & Compliance
Manufactured to exacting ASME B18.6.3 standards with Class 2A thread fit tolerances for consistent dimensional accuracy. Features 5-40 UNC coarse threads in right-hand direction with full threading along the 5/16" length. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across global industrial markets. The zinc-plated steel construction meets mechanical requirements of 60,000 psi tensile strength and Rockwell B70 hardness for demanding applications.
