S-91783A599 5/16"-18 x 4" 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, ideal for harsh industrial environments
• High tensile strength of 100,000 psi ensures reliable performance under heavy loads and mechanical stress
• Rockwell B100 hardness provides superior durability and resistance to wear in demanding applications
• Class 2A thread fit with UNC coarse threading enables quick assembly and secure fastening in various materials
• Partially threaded design offers optimal grip and clamping force where full threading isn't required
• Slotted drive compatibility allows for easy installation with standard tools while maintaining a clean aesthetic
• Full regulatory compliance including ASME B18.6.3, RoHS 3, and REACH ensures safety and environmental responsibility

Professional Applications & Engineering Value

This 18-8 stainless steel rounded head screw delivers exceptional engineering value through its combination of corrosion-resistant material and high-strength performance. The passivated finish significantly enhances the natural corrosion resistance of stainless steel, making it ideal for applications exposed to moisture, chemicals, or outdoor elements. The UNC coarse thread pattern with Class 2A fit ensures reliable engagement in various substrates while the partially threaded design provides precise clamping control. These industrial fasteners are engineered to solve common challenges in machinery assembly, structural frameworks, and equipment manufacturing where corrosion resistance, mechanical strength, and regulatory compliance are critical requirements. The rounded head profile with slotted drive offers both functional installation and clean visual appeal for finished applications.

Specification Summary & Compliance

This fastener maintains precise Class 2A thread fit tolerances with UNC coarse threading (5/16"-18) and right-hand thread direction. Manufacturing and dimensional specifications comply with ASME B18.6.3 standards for consistent quality and performance. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental responsibility and workplace safety. With a minimum thread length of 1-1/2" and overall length of 4", this screw meets rigorous industrial requirements for dimensional accuracy and mechanical performance.