S-91783A553 1/4"-20 x 2 3/4" 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, ensuring long-term reliability in harsh environments.
• High mechanical strength with 100,000 psi tensile strength and Rockwell B100 hardness, providing dependable performance under heavy loads.
• Optimized thread engagement with Class 2A thread fit and 1/4"-20 UNC coarse threading, enabling faster assembly and reduced cross-threading risk.
• Secure and accessible fastening via the slotted drive and rounded head design, allowing for straightforward installation and removal with standard tools.
• Partial threading for precise clamping on a 1 1/2" minimum threaded length, ideal for applications requiring specific grip range and vibration resistance.
• Full regulatory compliance with ASME B18.6.3, RoHS 3, and REACH standards, ensuring safety and environmental responsibility in global markets.
• Versatile inch-system sizing with a total length of 2 3/4", making it compatible with a wide range of industrial equipment and designs.

Professional Applications & Engineering Value

This 1/4"-20 UNC partially threaded rounded head screw is engineered to address critical challenges in industrial assembly, where corrosion resistance and mechanical durability are paramount. The 18-8 Stainless Steel material, enhanced by a passivated finish, effectively combats rust and chemical degradation in demanding settings like marine, food processing, and outdoor machinery. Its coarse UNC thread and Class 2A fit ensure quick, secure fastening with minimal risk of stripping, while the partially threaded shank allows for controlled clamping force—preventing joint loosening under vibration. Ideal for securing panels, brackets, and structural components, this screw delivers consistent performance in applications requiring ASME B18.6.3 compliance, reducing downtime and maintenance costs.

Specification Summary & Compliance

This screw adheres to precise dimensional standards, including a Class 2A thread fit and UNC coarse thread profile with a 1/4"-20 size. Manufacturing follows ASME B18.6.3 specifications, ensuring uniformity and reliability. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, confirming the absence of hazardous substances. With a tensile strength of 100,000 psi and Rockwell B100 hardness, it meets rigorous industrial demands for strength and durability.