S-91783A109 4-40 x 7/16" ASME B18.6.3 Stainless Steel Round Head Slotted Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with 18-8 stainless steel construction and passivated finish for long-term reliability in harsh environments
• High mechanical strength delivering 100,000 psi tensile strength and Rockwell B100 hardness for demanding applications
• Precision thread engagement with Class 2A UNC coarse threads ensuring reliable fastening and vibration resistance
• Optimized drive performance featuring standard slotted drive for straightforward installation with common tools
• Full-threaded design providing maximum grip length and load distribution across the entire 7/16" length
• Industry-standard compliance meeting ASME B18.6.3 specifications for consistent quality and interchangeability
• Environmental responsibility with RoHS 3 and REACH compliance for sustainable manufacturing practices

Professional Applications & Engineering Value

These 4-40 UNC rounded head slotted screws deliver exceptional engineering value in industrial settings where corrosion resistance and mechanical reliability are paramount. The 18-8 stainless steel composition, enhanced by passivated finish, provides superior protection against oxidation and chemical exposure, making them ideal for machinery, electronic enclosures, and marine applications. The Class 2A thread fit with coarse thread spacing ensures rapid assembly while maintaining secure fastening under vibration. The rounded head profile offers a finished appearance while the slotted drive accommodates standard installation tools. These fully threaded fasteners distribute stress evenly across the entire 7/16" length, preventing localized failure points in critical assemblies requiring 100,000 psi tensile strength performance.

Specification Summary & Compliance

This 4-40 UNC screw features precise Class 2A thread fit with coarse thread spacing (40 TPI) and right-hand threading. Manufacturing complies with ASME B18.6.3 specifications for dimensional accuracy and performance standards. The product meets RoHS 3 (2015/863/EU) compliance and REACH (EC 1907/2006) environmental regulations, ensuring adherence to international safety and sustainability requirements. Critical dimensions include 0.211" head diameter, 0.086" head height, and full threading along the 7/16" length.