S-91783A119 4-40 x 1 1/2" 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 load-bearing performance
• Precision thread engagement with Class 2A UNC coarse threads ensuring consistent fastening and vibration resistance
• Full-length threading provides maximum grip and load distribution across the entire 1-1/2" length
• Standard slotted drive design enables quick installation and removal with common tools
• Compliance with major industry standards including ASME B18.6.3 for dimensional accuracy and quality assurance
• Environmental regulation compliance with RoHS 3 and REACH, making them suitable for regulated industries

Professional Applications & Engineering Value

These 4-40 UNC rounded head slotted screws deliver exceptional engineering value in demanding applications where corrosion resistance and mechanical reliability are paramount. The 18-8 stainless steel construction combined with passivated finish creates a protective barrier against oxidation and chemical exposure, making them ideal for marine, chemical processing, and food equipment applications. The coarse thread design provides superior holding power in softer materials and resists loosening under vibration, while the fully threaded configuration ensures maximum engagement strength. The rounded head profile with slotted drive offers both aesthetic appeal and practical installation benefits, meeting strict ASME B18.6.3 specifications for dimensional consistency across industrial assemblies.

Specification Summary & Compliance

These screws feature precision Class 2A thread fit with UNC coarse threading (4-40 size) and right-hand thread direction, manufactured to exacting ASME B18.6.3 standards. The 1-1/2" length with full threading maintains dimensional accuracy for consistent performance. Compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations ensures environmental safety and suitability for global industrial markets, while the 100,000 psi tensile strength and Rockwell B100 hardness guarantee mechanical reliability in critical applications.