Purpose of Hexagon Bolts Manufacturer's Hexagon Bolts
Typical use
Hex bolts for construction projects where materials need to be held together; such as installing a bike seat, assembling a swing, or building a boat dock. They are held in place with hex nuts. A wrench is usually used to tighten the nut to the bolt with the proper torque. Flat washers can also be used to help secure the bolt and cover any excess space/gap between the hole the bolt goes through and the bolt head. Lock washers, while also helping to secure bolts and covering gaps, also help prevent components from moving.
sizing
Hexagon Bolt Size Chart
Hex bolt diameter is expressed by shank diameter and threads per inch. For example, a typical hex bolt with a 1/4" shank diameter and 20 threads per inch would be represented as "1/4 -20". Typical diameters range from 1/4" to 2".
The length of the hex bolt is measured from the top of the shank (under the head) to the tip of the shank. Typical lengths range from 1/4" to 30". Larger sizes in diameter and length can be ordered by special order.
thread
fine thread
Hexagon bolts are available in two sizes: fine thread and coarse thread. The number "20" in the 1/4-20 hex bolt example above is a coarse thread, meaning there are 20 threads per inch. Conversely, 1/4-28 hex bolts are finely threaded, meaning there are 28 threads per inch. Therefore, coarse thread bolts always have fewer threads per inch than fine thread bolts.
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