Types And Causes Of Nut Surface Defects-Indentation

In a previous article, we looked at wrinkles in fastener surface defects. In this article, as a professional fastener manufacturer, we Xinchi Fastener Company will continue to introduce the indentation of fastener nut surface.

A dent is a shallow pit or depression that appears on the surface of a nut due to metal not being filled during forging or upsetting.

Indentation on fastener nut surface

Cause of indentation: Indentation is a mark or impression caused by chips or shear burrs or rust layers of raw materials and not eliminated in the forging or upsetting process.

Note: The depth of the dent is h: h should be less than 0.02D or 0.25mm at most.

Indentation area: For those nuts whose nominal diameter D is less than or equal to 24mm, the sum of indentation area on the supporting surface shall not exceed 5% of the total area of the supporting surface; For nuts whose thread nominal diameter D is greater than 24mm, the sum of indentation areas on the supporting surface should not exceed 10% of the total area of the supporting surface.

D- nominal diameter of the thread

Xinchi Fastener Company is a trustworthy fastener company, especially in furniture nuts. And we are the designated fastener supplier to“STAPLE”. As a trusted fastener supplier,  Xinchi Fastener Company can offer a wide range of high-quality fasteners, including tee nuts, screws, bolts, rivets, washers, etc. If you want to know more about fasteners or want to wholesale fasteners, please feel free to contact us. And then our experienced and expert service team will reply to you as soon as possible.