S-95345A033 4-40 x 5/8" ASME B18.13 Stainless Steel Pan Head Phillips Screws with Internal-Tooth Lock Washer

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction and passivated finish for extended service life in harsh environments
• Vibration-resistant locking performance through integrated 410 stainless steel internal-tooth lock washer preventing fastener loosening
• High-strength reliability with 70,000 psi tensile strength ensuring dependable performance in demanding applications
• Quick installation efficiency featuring No. 1 Phillips drive and coarse UNC threads for faster assembly and reduced labor time
• Precise thread engagement with Class 2A thread fit providing consistent clamping force and reliable connections
• Full-threaded design offering maximum grip length and uniform stress distribution along the entire fastener
• Regulatory compliance assurance meeting ASME B18.13 specifications and environmental standards including RoHS 3 and REACH

Professional Applications & Engineering Value

These 4-40 UNC rounded head screws with integrated internal-tooth lock washers address critical vibration and corrosion challenges in industrial assemblies. The 18-8 stainless steel construction combined with passivated finish provides exceptional resistance to oxidation and chemical exposure, making them ideal for electronics enclosures, machinery panels, and outdoor equipment where environmental durability is paramount. The pan head profile with Phillips drive ensures flush mounting and secure tool engagement, while the coarse thread design facilitates rapid installation in various materials. The 410 stainless steel lock washer maintains clamp force under dynamic loads, eliminating the need for separate locking components and reducing assembly complexity. Engineered to ASME B18.13 standards, these screws deliver consistent performance in automated production environments and maintenance applications requiring reliable, long-term fastening solutions.

Specification Summary & Compliance

This 5/8" length screw features Class 2A thread fit tolerances with UNC coarse threads (4-40 size) and fully threaded design. Manufacturing complies with ASME B18.13 specifications for dimensional accuracy and performance. The fastener system meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental compliance requirements, ensuring suitability for regulated industries and international markets.