Types of Weld Nuts

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Types of Weld Nuts
Weld nuts fasten and weld to other objects. (nut image by Jesse-lee Lang from Fotolia.com)

Nuts refer to hardware fastener devices with threaded holes that typically connect parts together. Weld-style nuts are designed to weld to another object. Welding nuts come in numerous styles and types.

Round Base

Round base weld nuts contain a cylinder that is threaded and relatively long, and a base that is circular and large to facilitate welding. Round base weld nuts may also contain projections, called nibs, designed to prevent the weld nut from warping during welding at high heat.

Slab Base

Slab base weld nuts offer a similar cylinder configuration to round base nuts, but contain an obround base as opposed to a round base. Obround refers to a shape consisting of a pair of semicircles that connect via parallel lines. Slab base weld nuts are often applied in tubes and similarly constricted areas.


Retainer type weld nuts, also referred to as bridge weld nuts, are comprised of a retainer which holds a floating nut. The retainer piece is welded directly to the weld object, enabling the nut to float.

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