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Fully and Partially Threaded Bolts: How to Choose

Choosing the right type of fasteners is an important consideration if you want to utilise them. Generally, most individuals will find this to be a challenging task, especially if they have not given any thought to the wide variety of alternatives accessible to them or the precise reasons for purchasing the fasteners in the first place.

A key decision is deciding between partially threaded and fully threaded bolts. It is not advised to just choose one or the other, but rather to address the reasons why you are acquiring the fasteners to begin with.


Typically, a fully threaded bolt will have threading throughout its whole length, from the head to the tip. The partially threaded variants, on the other hand, often have a non-threaded section below the head. The grip length of a bolt varies from one design to the next, depending on the intended application.


When grip strength is absolutely necessary, fully threaded bolts are what you want to utilise. Unlike partially threaded bolts, a fully threaded shaft distributes the force acting on the bolt over the whole structure, allowing it to bear larger loads. Additionally, fully threaded bolts are less likely to shear and loosen up. However, partially threaded bolts are often utilised in situations where alignment and shear resistance are crucial. Because there are no threads throughout the bolt's grip length, it has excellent shear properties and is not susceptible to cracking or bending. Extremely high levels of force are often required to shear such a bolt.


Once you understand the distinctions between the two kinds of bolts, it should be simpler to choose which one to use for a specific application. If you believe that the fasteners will be subjected to a great deal of shear, it may be preferable to use a partially threaded bolt, whereas it may be preferable to use a fully threaded bolt you need the grip strength to be high.

Avlock International is a leading manufacturer and distributor of specialised fastening systems to both the domestic market and other global destinations. For an obligation-free quote or demonstration, contact Avlock today.

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