Hex Nut

A hex nut is a six-sided internally threaded fastener used with a compatible bolt, screw or threaded rod. It provides a removable threaded joint in construction, machinery, maintenance and general hardware assemblies. Buyers should specify standard, thread diameter and pitch, style, property class, material and coating. Standards listed here govern particular forms and do not make sizes, materials or finishes interchangeable. The RFQ should state the exact standard or drawing, required configuration, quantity and inspection evidence. This directory entry references ISO 4032:2023, which covers hexagon regular nuts with metric coarse and fine pitch threads. The nominal size range in the main scope is M5 to M39, but the actual applicable size must be confirmed against the standard and the specific product. Materials on file are steel and stainless steel; strength and performance classes should be selected according to ISO 898-2 for steel and ISO 3506-2 for stainless steel. Surface finishes may be plain, zinc-plated, hot-dip galvanized, or a specified coating. These parameters are reference values and must be verified with the legal manufacturer or supplier for the exact model. The working principle is that the mating threads convert tightening torque into axial preload, clamping the joint against the bolt head or opposite feature. For proper selection, the user must confirm the thread size, pitch, style, property class, material, and coating against the relevant standard and the application requirements. Always verify model-specific values and standards with the legal manufacturer or supplier before purchase.

The mating threads convert tightening torque into axial preload and clamp the joint against the bolt head or opposite feature. When the nut is turned onto a bolt, the helical threads engage, and the applied torque creates a tensile force in the bolt and a compressive force on the clamped parts. This preload holds the joint together, resisting separation and shear. The nut's hexagonal shape allows a wrench to apply torque. The effectiveness depends on thread fit, friction, and material properties. Over-tightening can cause thread stripping or bolt failure; under-tightening can lead to loosening. Regular inspection and proper torque are essential for maintaining joint integrity.