Common Bolt Fastener Types

Bolts are a common fastener for numerous assemblies, and they are often paired with an external nut with the use of their threading. This allows a bolt to be inserted into the hole of a component in order to permit two or more parts to come together. The joined components can then be tightened together by applying torque to the bolt fastener. In this blog, we will provide a brief overview of the most commonly used bolts and why they are fundamentally important in aiding the assembly of components and structures.

Blind Bolts

When access to a certain part or element of an assembly is restricted during the construction process, blind bolts allow you to anchor the fastener to a structure with ease. Typically used in cases where access to the bolt is limited and unable to be tightened, blind bolts can be inserted into metal tubing, bypassing a structure and eliminating the need for drilling holes.

Carriage Bolts

Carriage bolts are a bolt type that feature self-locking capabilities, and this allows for a more secure installation as the bolt will resist turning or loosening after the nut is tightened to the opposite side. This bolt’s flush-mount domed head is consecutive with a squared underbelly followed by a nut, permitting the bolts to be tightened or loosened with torque.

Hex Bolts

Hex bolts, also known as hexagon head bolts, can commonly be found internationally in both metric and imperial sizes. Consisting of a hexagonal shaped head, these bolts can be tightened with the aid of a socket or wrench. Additionally, varying on the form of use, these bolts can be found either threaded or unthreaded.

Pentagon-Head Bolts

Pentagon-head bolts, or penta-head bolts, are specifically designed to help mitigate the risk of tampering with a structure and its fasteners. Offering a five-sided head, this bolt requires an uncommon and specialized penta-socket tool to be removed. As most standard wrench and socket tools will be incapable of removing such bolts after they are tightened, there is less likelihood that an individual may be capable of interfering with the installation.

Round Head Bolts

In resemblance to, yet unlike the carriage bolt, a round head bolt can be seen without a squared taper beneath its head. Typically used to join wooden parts together, this component relies on the softer density of the installation material to hold it in place with friction. This allows a nut to be tightened on the opposite end of the bolt to inhibit it from turning in place.

T-Head Bolts

Due to the design of T-head bolts, such components are capable of being inserted into the slot or recess of a part, enabling it to be secured below the surrounding material. Once inserted, the bolt head will remain intact, allowing a nut to be secured and tightened. Often, you can find these components commonly used to hold fuel tanks and other larger objects in place with a strap or band clamp for the ease of tightening.

Like all parts, the material of bolt fasteners can corrode or become worn over time and such components should be replaced as necessary before they become a costly issue. Regardless of the fastener types you need for your operations, NSN Unlimited can help you find what you need, new or obsolete. NSN Unlimited is owned and operated by ASAP Semiconductor, and we are dedicated to providing customers with competitive pricing on everything that we offer for their benefit. We also serve as a trusted distributor for bearing fasteners, connector parts, and aircraft parts that come from leading manufacturers. If you would like to request a quote for your comparisons, you can submit an RFQ form as provided on our website. Upon receival, a dedicated account manager will quickly review and respond with a personalized solution to your needs in just 15 minutes or less, 24/7x365.


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