S-91783A604 5/16"-18 x 5" ASME B18.6.3 Stainless Steel Round Head Slotted Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance thanks to 18-8 Stainless Steel construction and passivated finish, ideal for harsh industrial environments.
• High tensile strength of 100,000 psi ensures reliable, long-lasting fastening under significant mechanical stress.
• Rockwell B100 hardness provides excellent durability and resistance to wear and deformation.
• Coarse UNC threading (5/16"-18) offers faster installation and superior grip in a wide range of materials.
• Class 2A thread fit guarantees consistent, precise engagement for smooth assembly and reduced cross-threading risk.
• Partially threaded design allows for controlled clamping force, perfect for applications requiring specific unthreaded shank sections.
• Slotted drive and rounded head facilitate easy installation and provide a finished, low-profile appearance.

Professional Applications & Engineering Value

This 5/16"-18 UNC partially threaded rounded head screw is engineered to solve critical fastening challenges in demanding industrial settings. The 18-8 Stainless Steel material, combined with a passivated finish, provides exceptional resistance to rust and corrosion, making it ideal for outdoor equipment, marine applications, and chemical processing plants where environmental factors degrade lesser fasteners. The coarse thread design ensures quick, secure installation in both soft and hard materials, reducing assembly time while maintaining a strong hold. With a high tensile strength and Rockwell B100 hardness, it withstands vibration and heavy loads, preventing joint failure in machinery, structural frameworks, and conveyor systems. The partially threaded shank offers precise clamping, essential for securing components like bearings or pulleys without over-tightening.

Specification Summary & Compliance

This screw features a 5/16"-18 UNC coarse thread with a Class 2A thread fit for standard dimensional accuracy and reliable engagement. It is manufactured in compliance with ASME B18.6.3 specifications, ensuring consistent quality and performance. The product is also RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, confirming it meets stringent environmental and safety regulations for hazardous substances.