National standard pulley models are there? National standards for the V-belt models are O, A, B, C, D, E, F seven models, the corresponding groove pulley wheel angle, there are three 34 °, 36 °, 38 °, each model also provides the Triangle The minimum diameter of the wheel with each groove corresponding to the angle of the small pulley large pulley is not specified. Pulley belong hub parts, generally relatively large size, the manufacturing process generally casting, forging based. Generally larger size designed for casting methods, materials are generally cast iron (casting performance is better), rarely used steel (steel casting performance is poor); general smaller size, can be designed to forging material steel. Pulley indicators and the choice of materials is able to achieve the requirements under the premise of minimizing the raw material, technology is feasible, the principle of the lowest cost option! Pulley is mainly used for long-distance transmission of power situations, such as the output power of small diesel engines, agricultural vehicles, tractors, auto large Bushes, mining machinery, processing equipment, textile machinery spz Bushes, packaging machinery Bushes, lathe , forging bed spc Bushes, some small horsepower motorcycle power transmission, the transmission power of agricultural machinery, air compressors, reducers, gear, generator, ginning machines and more. Large Bushes, Hengda Machinery (certified), Shaanxi Bushes provided by the Texas Hengda Machinery Co., Ltd. Texas Hengda Machinery Co., Ltd. (www.sddzhdjx.com) (www.sddzhdjx.com) Shandong Dezhou, machining leaders, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer demand. In Hengda Machinery leadership with the staff warmly welcome all inquiries negotiations to create a better future Hengda machinery.