S-91783A108 4-40 x 3/8" ASME B18.6.3 Stainless Steel Round Head Slotted Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction and passivated finish, ideal for harsh industrial environments
• Exceptional mechanical strength with 100,000 psi tensile strength and Rockwell B100 hardness for reliable performance under load
• Precision thread engagement through Class 2A thread fit and UNC coarse threads ensuring secure fastening and easy installation
• Full-length threading provides maximum grip and load distribution across the entire fastener length
• Standard slotted drive compatibility with rounded head profile for straightforward installation using common tools
• Regulatory compliance assurance meeting ASME B18.6.3 specifications and environmental standards including RoHS 3 and REACH
• Right-hand thread design offers familiar installation direction compatible with standard assembly processes

Professional Applications & Engineering Value

These 4-40 UNC rounded head slotted screws deliver critical performance advantages in demanding industrial applications. The 18-8 stainless steel composition combined with passivated finish provides exceptional resistance to corrosion and chemical exposure, making them ideal for machinery, electronic enclosures, and outdoor equipment. The coarse thread design ensures rapid installation and superior holding power in various materials, while the fully threaded configuration maximizes surface contact for enhanced vibration resistance. The rounded head profile with slotted drive offers reliable torque transmission without compromising aesthetic requirements. Engineered to ASME B18.6.3 standards, these fasteners provide consistent dimensional accuracy and mechanical properties that manufacturing engineers and maintenance professionals depend on for critical assemblies.

Specification Summary & Compliance

This fastener features Class 2A thread fit tolerance for reliable mating with standard nuts and threaded components. Manufacturing complies with ASME B18.6.3 specifications ensuring dimensional consistency and performance reliability. The product meets RoHS 3 (2015/863/EU) compliance for restricted substance control and REACH (EC 1907/2006) requirements for chemical safety. Thread configuration follows UNC coarse thread standards with 4-40 thread size and right-hand orientation. The combination of 18-8 stainless steel material and passivated surface treatment provides optimal corrosion protection while maintaining mechanical integrity.