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High nuts are considerably thicker than standard hex nuts. Aside from offering increased thread engagement with the bolt/screw, their height provides more surface area for wrenching, which makes them popular in the vehicle and industrial equipment industries. Hex is short for hexagon, which means they have six sides. High nuts are also known as:
Lock washers may used with high nuts.
Threads are standard right-hand and Unified inch fine (UNF, Unified National Fine).
High nut size refers to its nominal thread diameter. Typically, sizes range from 3/8" to about 1 1/2". Size is specified in inches, usually fractional rather than decimal. Not all types are available in all sizes.
Grade 5 and heat treated (Grade 8), plain finish and zinc plated, are common types. Never replace a graded high nut with a lower grade or lower strength nut. Surface markings identify the grade. (Plain finish is unplated so there is no surface treatment to inhibit rust.)
Always follow the manufacturer's recommendations regarding nut reuse, thread lubricants/locking compounds and torque values.
If you need a nut thinner than a high nut, choose a thick hex nut.