S-90604A311 4-40 x 5/8" ASME B18.6.3 Stainless Steel Pan Head Combination Phillips/Slotted Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction and passivated finish for long-lasting performance in harsh environments
• High tensile strength of 100,000 psi ensures reliable fastening under demanding mechanical loads
• Dual-drive convenience with Phillips/Slotted head accommodates various installation tools and preferences
• Precision Class 2A thread fit guarantees consistent engagement and reduces cross-threading risks
• Full threading along 5/8" length provides maximum grip and uniform stress distribution
• Comprehensive regulatory compliance with ASME B18.6.3, RoHS 3, and REACH standards ensures safety and environmental responsibility
• Optimized pan head design offers excellent bearing surface while maintaining low profile clearance

Professional Applications & Engineering Value

These 4-40 UNC rounded head screws deliver exceptional engineering value across industrial applications where corrosion resistance and mechanical reliability are critical. The 18-8 stainless steel composition, enhanced by passivated surface treatment, provides superior protection against oxidation and chemical exposure in manufacturing equipment, electronic enclosures, and marine components. The coarse UNC thread pattern with Class 2A fit ensures rapid assembly and vibration resistance, while the Rockwell B100 hardness maintains thread integrity through repeated installations. The dual Phillips/Slotted drive configuration offers installation flexibility for both automated and manual assembly lines, reducing tooling requirements and improving production efficiency in fastening operations requiring 5/8" length fully threaded fasteners.

Specification Summary & Compliance

Manufactured to precise inch system dimensions with Class 2A thread fit tolerance per UNC standards. Complies with ASME B18.6.3 mechanical specifications, RoHS 3 (2015/863/EU) for hazardous substance restriction, and REACH (EC 1907/2006) environmental safety standards. Features right-hand coarse threading with full 5/8" length and standardized pan head profile for consistent performance across industrial applications.