BOLT, MACHINE - DOUBLE HEXAGON EXTENDED WASHER HEAD, PD SHANK, CORROSION AND HEAT RESISTANT STEEL, UNS S41800, 140 KSI MIN, .1900-32 UNJF-3A

This technical specification defines precise requirements for bolts featuring a dual-hexagon extension washer head design, intended specifically for machine applications. The document establishes dimensional tolerances, mechanical properties, and performance criteria for components manufactured from corrosion-resistant and heat-resistant stainless steel designated as UNS S41800. A critical aspect of this specification is the mandate for a minimum tensile strength of 140 KSI, ensuring reliability under high-stress conditions. The standard further details the threading configuration, specifying a .1900-32 UNJF-3A thread series to guarantee compatibility and proper assembly within designated machinery systems. It encompasses all necessary material characteristics to maintain structural integrity in environments where resistance to both oxidative degradation and elevated temperatures is essential. The scope includes verification methods for hardness, thread engagement, and head geometry to ensure uniformity across production batches. Adherence to these guidelines facilitates the interchangeability of fasteners in critical engineering applications, supporting consistent quality and safety in mechanical assemblies. This document serves as a comprehensive reference for manufacturers and engineers requiring durable fastening solutions with specific high-performance attributes.