Types And Causes Of Nut Surface Defects-Cut Marks

In a previous article, we looked at indentation in fastener surface defects. In this article, as a professional fastener manufacturer, we will continue to introduce the cutting marks on the nut surface of fasteners.

Cut marks are shallow grooves in longitudinal or circumferential directions.

Cut marks on the nut surface

The cause of the cut mark: The cut mark is caused by the relative motion between the manufacturing tool and the workpiece.

Note: The surface roughness of the cut mark on the nut-supporting surface shall not exceed Ra=3.2μm(according to GB/T1031). Cut marks on other surfaces are allowed.

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