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石家庄拖拉机配件厂生产的STP牌4115、4125（东方红54/75、东方红—28）型活塞销,近几年来在部、省的质量检查和行业检查评比中一直稳定在优等品水平,1980年分别被评为河北省和农机部的优质产品,在1981年全面质量评比中荣获国家银质奖。 ST P牌4115,4125型活塞销加工精度高、外观光洁、装配性能好、使用寿命长。外圆尺寸的几何精度（棱圆度、圆锥度、椭圆
STP brand 4115, 4125 (Dongfanghong 54/75, Dongfanghong-28) type piston pin produced by Shijiazhuang Tractor Parts Factory has been stable in the quality inspection and industrial inspection appraisals of the provinces and autonomous regions in recent years. Year were rated as Hebei Province and the Ministry of Agricultural Machinery of quality products, in 1981 the overall quality appraisal won the national silver medal. ST P brand 4115,4125-type piston pin processing precision, smooth appearance, good assembly performance, long service life. Geometric accuracy of the outer dimensions (roundness, conicity, ellipse