S-90403A145 6-32 x 5/16" ASME B18.13 Steel Pan Head Phillips Screws with Internal-Tooth Lock Washer

Key Features & Benefits at a Glance

• Superior vibration resistance with integrated internal-tooth lock washer that maintains tight fastening under dynamic loads
• Enhanced corrosion protection through zinc-plated steel construction for extended service life in harsh environments
• High tensile strength performance rated at 60,000 psi for reliable fastening in demanding applications
• Optimized drive engagement with Phillips No. 2 drive design for efficient installation and reduced cam-out
• Precise thread compatibility featuring UNC coarse threads with Class 2A fit for secure mating with standard components
• Complete thread coverage with fully threaded design ensuring maximum grip length and holding power
• Regulatory compliance assurance meeting ASME B18.13 standards and environmental regulations for quality and safety

Professional Applications & Engineering Value

These zinc-plated steel pan head screws with internal-tooth lock washers provide critical vibration-resistant fastening solutions for industrial equipment, machinery assemblies, and electronic enclosures. The 6-32 UNC coarse thread configuration ensures rapid installation and reliable performance in materials where fine threads might strip or fail. The integrated lock washer eliminates the need for separate components while providing permanent locking action that withstands mechanical stress and thermal cycling. With 60,000 psi tensile strength and Rockwell B69 hardness, these fully threaded screws maintain structural integrity in high-vibration environments where loosening could compromise safety or functionality. The Phillips No. 2 drive offers familiar, efficient installation while the rounded pan head profile provides a finished appearance with adequate clearance for tool access.

Specification Summary & Compliance

Manufactured to precise dimensional standards with Class 2A thread fit and UNC coarse thread specifications. These screws feature a 5/16" length with fully threaded design and integrated internal-tooth lock washer (0.288" OD). Compliance includes ASME B18.13 mechanical standards, RoHS 3 (2015/863/EU) for hazardous substance restrictions, and REACH (EC 1907/2006) environmental regulations, ensuring quality and regulatory adherence for industrial applications.