Hex Flat Nut

A hex flat nut is a six-sided fastener with a flat bearing surface designed to evenly distribute clamping forces across the joints of mechanical, automotive and building components. Unlike flange nuts or dome nuts, the low profile design of the nut minimizes volume, making them ideal for narrow Spaces where space is limited. Its hexagonal shape makes it easy to tighten a standard wrench or socket, ensuring compatibility with global bolt systems. Manufactured to ISO 4032 (metric) and ASME B18.2.2 (imperial) standards, hex flat nut guarantee precise threading and reliable performance at high torques. Due to their durability and ease of installation, they are widely used in structural frames, pipes and industrial equipment.

Product details and parameters

Our hex flat nut meet international standards (ISO 9001, ASME B18.2.2) and are rigorously tested for hardness, tensile strength and thread integrity. Factory Test Certificate (mtc) and third party inspection (SGS, TUV) ensure traceability and quality consistency. For key sectors such as oil/gas or defense, hex flat nut comply with API 20E or NADCAP specifications. Custom orders include complete documentation for material certification and compliance audits, guaranteeing the reliability of the global supply chain.

FAQ

Q: What are the main differences between hex flat nut and square nuts in installation?

A: The hex flat nut is designed with six sides and matches the wrench, which relies on flat or square grooves. While flat nut provide better accessibility in confined Spaces using standard tools, square nuts perform well in manual assembly where rotational resistance is critical. Both nuts distribute the load evenly, but hex flat nuts are preferred for heavy machinery due to their wrench-friendly design, while square nuts are suitable for low-clearance applications without tools.

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