In the hardware industry, there are hex nuts in varieties you might not have imagined

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http://www.yafan88.com/up/image/201611/20161128182181338133.png Hex nuts are classified into Type I, Type II, and thin type according to their nominal thickness. Nuts of grade 8 and above are divided into Type 1 and Type II. Type 1 hex nuts are the most widely used. Type 1 nuts are further divided into grades A, B, and C: grades A and B are suitable for machines, equipment, and structures with low surface roughness and high precision requirements, while grade C nuts are used for those with relatively rough surfaces and lower precision demands. Type 2 hex nuts are thicker and are often used in applications where frequent installation and removal are required. Type 1 nuts refer to ordinary hexagonal nuts with a nominal height of m ≥ 0.8D, whose dimensional specifications shall comply with GB/T6170; whereas type 2 nuts have a higher height than type 1 nuts, and their dimensional specifications shall comply with GB/T6175. There are two purposes to adding a type 2 nut: one is to obtain a nut that does not require heat treatment and is relatively inexpensive, by increasing the height of the nut. Since type 1 nuts of grade 8 with D≤M16 do not require heat treatment, among grade 8 nuts, only those with D>M16~39 use type 2 nuts. Obviously, type 1 nuts that do not require heat treatment cannot meet the mechanical property requirements of grade 9 nuts. Another purpose of specifying Type 2 nuts is to obtain Grade 12 nuts with better toughness. Due to the increased height of the nut, the guaranteed stress criteria can be met at lower quenching and tempering hardnesses, thereby improving the toughness of the nut. Classified by tooth pitch: standard tooth, regular tooth, fine tooth, extremely fine tooth, and reverse tooth. Classified by material: stainless steel hex nuts, carbon steel hex nuts, copper hex nuts, and iron hex nuts. Classified by thickness: hex thick nuts and hex thin nuts. Classified by usage method: hot-melt copper nuts, hot-press copper nuts, embedded copper nuts, and ultrasonic copper nuts. Dongguan Yafan Hardware & Mechanical Equipment Co., Ltd