Custom Bolts and Fasteners

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There are various aspects to consider if you require custom bolts and fasteners. It is critical to understand how various types of bolts work in order to select the ideal one for your purposes.

Before you decide to purchase custom-made bolts, you should be aware of the many types and sizes available on the market. 

To do so, you must first understand:

  • what pitch diameter is
  • which is an imaginary circle that runs through the thread profile.

This measurement is taken at the intersections of adjacent thread shapes and spaces.


Custom produced bolts have a wide range of applications, from simple to sophisticated. These specialist fasteners are a wonderful choice for industrial needs, from securing cables to repairing automotive leaf springs. Custom-made bolts are created from a range of materials, and their application is ultimately determined by the environment in which they are utilised. Here are just a few of the various applications for custom-made bolts. Flange bolts are most typically utilised in heavy-duty applications.

Flange bolts include an inbuilt washer that distributes stress evenly. A lag bolt is another frequent variety that has threads just on a section of the bolt’s shank. These bolts are often press-fitted into a stud or wood, and their threaded portion can be used effectively and firmly.


Today’s market offers a wide range of custom-made bolts. Learn more about these types so you can choose the ideal one for your needs. For a custom-made bolt, pitch diameter, or the size of an imaginary circle that passes through the thread profile, is a crucial quantity. The diameter of this circle is determined by measuring the diameters of nearby thread shapes and gaps. The pitch diameter of a bolt can be used to change the diameter of the bolt.

A bolt often has an exterior male thread and is used to connect two pieces. These fasteners are sometimes referred to as nuts and bolts because they may be removed for repair and maintenance. Many industries, including construction, agriculture, and consumer products manufacture, rely on custom-made fasteners. If you require a bolt that is custom-made to the exact dimensions of your product, contact a manufacturer which provide you according to your requirement.


Whether your application requires a bolt that has custom-designed threads or a bolt with suitable size, understanding the various types of fasteners is critical to attaining the best outcomes. There are several varieties of custom-made bolts on the market nowadays. The pitch diameter of a thread is the diameter of an imagined circle that runs through the thread profile. This is determined by measuring the sites where the thread shapes and space are equal.

Threads with a large root radius and a low stress concentration are known as external J threads. These threads are found on bolts that support heavy loads. Similarly, the UNR thread has a rounded root radius and is frequently used in applications requiring finer tolerances. External threads of the UNK and UNF kinds are frequently interchangeable. UNEF and UNR threads are slightly different from UNF and UNK threads.


Metric bolts are classified into three types: 

  • Flange
  • Machining  
  • American

Metric bolts are identified by M sizes, which represent the pitch, diameter, and length. The latter is frequently favored over metric sizes because it facilitates conversion to and from imperial units. An M8 bolt, for example, has a diameter of 7.8mm, but an M10 bolt has a diameter of 7.7mm.

Custom-made bolts have a surface and a core in addition to normal lengths. The surface is the top surface of a bolt after surface rust has been removed and the Rockwell or Vickers hardness has been determined, whereas the core is the smallest section.

The discrepancy should not be greater than 30 HV. When the surface is harder than the core, it has been decarburized or carburized, but a lower hardness indicates that it does not have.


When creating a bespoke bolt, you’re probably thinking about a few things. It can range from the hole’s size and form to the type of fastener required. Corrosion-resistant materials should also be considered, as stainless steel fasteners are highly resistant to corrosion. Whatever your needs are, know which type of material you’re working with is critical to the project’s success.

A bespoke fastener with two ribbed male projections and a curved base is a U-Bolt. A carriage bolt has a square proximal shaft that prevents the bolt from twisting during usage. U-bolts and carriage bolts are available in a range of materials, and custom sizes and thicknesses are available.

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