Recycled plastics industry will follow the development of the Belt and Road
Application scope: mostly used for the connection of smaller parts. Cross Recessed Tapping Screws,Pan Head Tapping Screws,Stainless Steel Screws,Steel Head Tapping Screw Kunshan Zhonggu Precision Hardware Co., Ltd. , https://www.zgfastener.com
It has pan head Screws, countersunk head screws, half countersunk head screws and large flat head screws. Pan head screws and large flat head screws are used in the occasion where the nail head is allowed to be exposed;
Half countersunk head screws have an arc-shaped head, and its top is slightly exposed after installation, and beautiful and smooth, generally used in instruments or precision machinery; countersunk head screws are used in places where the nail head is not allowed to be exposed.
2. Reference standard: Reference standard
Cross recessed pan head screws GB818-85
Cross recessed countersunk head screws GB819-85
Cross recessed umbrella head screws GB820-85