Below are images of locking nuts and non-locking nuts. Factory direct sales of anti-loosening nuts, self-retaining nuts, splined nuts, nylon nuts, and press-fitting screws PLC-M4. A complete range of specifications. Shenzhen Hengbo Precision Hardware Products Co., Ltd. specializes in the production and sales of American PEM and Southco press-fitting screws and various products. A large inventory of commonly used parts is available. Welcome new and old customers to send in drawings for processing and customization. Look forward to establishing a good, mutually beneficial business partner relationship. Welcome to send in drawings and samples or visit us.