what is hex nut

Aug 27, 2025

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Parameters of Hex Nuts

 

Hex nuts are defined by several key parameters that ensure compatibility with mating fasteners (bolts, screws, or studs) and suitability for specific applications. These parameters are standardized across metric and imperial systems.

 

 
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Thread Parameters

 

Metric: Expressed as "M" followed by diameter (e.g., M5, M10, where "M5" indicates a 5mm nominal diameter).

Imperial: Expressed in inches (e.g., 1/4", 3/8").

 

 
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Dimensional Parameters

Width Across Flats (WAF): The distance between two opposite flat sides of the hexagon. This determines the size of the wrench or socket required for installation/removal (e.g., an M8 metric nut usually has a WAF of 13mm).

 
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Material Grade: Indicates strength and performance (e.g., metric steel nuts: 8.8, 10.9; imperial: Grade 2, Grade 5). Higher grades withstand greater tensile and shear forces.

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Single 92*188
King-Single 107*203
Double 138*188
Queen 153*203
King 183*203

 

 

 

Applications of Hex Nuts

 

 
Application scenarios

 

Hex nuts are one of the most widely used fasteners in machinery, construction, and daily life, valued for their hexagonal shape that allows easy tightening/loosening with wrenches. Here are their common application scenarios:
 
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Mechanical Engineering

Used with bolts or screws to secure components in engines, gearboxes, and industrial machinery. For example, they fasten metal plates, shafts, and brackets in manufacturing equipment.

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nstruction and Infrastructure

Essential in building structures (e.g., bridges, steel frames) to connect beams, columns, and panels. They also secure scaffolding, ensuring stability during construction.

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Automotive and Transportation

Found in cars, trucks, and motorcycles to fasten parts like engines, wheels, and chassis. Their robust grip prevents loosening from vibrations during movement.

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Electrical and Electronics

Secure electrical enclosures, junction boxes, and mounting brackets for wires or circuit boards. They provide a reliable seal against dust and moisture.

 

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The Advantages of Hex Bolts

 

 

  • The hexagonal head design provides a stable contact surface for wrenches (such as open-end wrenches, box-end wrenches, socket wrenches, etc.), making it less likely to slip during operation.  Compared with slotted or Phillips screws, even in scenarios with limited space or requiring large force, torque can be applied more easily, improving the efficiency of installation and disassembly.

  • When subjected to loads such as vibration and impact, the contact area between the head of the hex bolt and the nut (or the connected part) is relatively large. With appropriate pre-tightening force, it can form more stable friction, reduce the risk of loosening, and ensure long-term reliability of connection.The cross-section of the bolt shank is circular, with uniform material distribution, which can bear large axial tension and shear force; the structural design of the hexagonal head also enables it to better transmit torque, avoiding head deformation or fracture when the force is too large.
  • Hex bolts can maintain good performance whether in normal temperature and pressure environments, or harsh environments such as high temperature, low temperature, humidity, and corrosion (by selecting materials such as stainless steel and galvanized), and are widely used in machinery manufacturing, construction engineering, automobile and shipbuilding, electronic equipment and other fields.
  • The processing  (such as cold heading forming, thread processing, etc.) of hex bolts is very mature. When mass-produced, the efficiency is high and the cost is low, which is suitable for large-scale applications.

    High material utilization rate: Compared with some fasteners with special shapes, the structure of hex bolts is simple, with less material waste, which further reduces the manufacturing cost.

 

 

 

We are professional fastener manufacturers, dedicated to the research, development, production and sales of various fasteners. With years of industry experience and technical accumulation, we have established a complete and mature production system to provide reliable fastening solutions for customers in different fields.Our product line is rich and diverse, covering bolts, nuts, screws, washers, rivets, studs and other series. These products are available in a variety of materials, including carbon steel, stainless steel, alloy steel, copper, aluminum, etc., to meet the needs of different working environments and application scenarios. Whether it is the harsh conditions of construction engineering, the high precision requirements of the automotive industry, the strict standards of the machinery manufacturing field, or the delicate needs of the electronics industry, we can provide suitable fastener products.

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