B20A型风扳机于1972年设计、试制成功,并于当年投入成批生产。本产品在南京市政水泥制品厂和杭州汽车发动机厂试用一年,性能及寿命稳定,受到用户欢迎。 B20A型风扳机以压缩空气为动力能源,用于旋拧M18～22的螺钉螺帽,特别适用于汽车、拖拉机、内燃机、机车等的装配流水作业线。使用风扳机比手工旋拧螺钉可提高工效3～16倍,并可保证装配质量,减轻劳动强度。 B20A type wind trigger designed in 1972, trial success, and in the same year put into mass production. This product in Nanjing municipal cement products factory and Hangzhou Automobile Engine Factory pilot year, the performance and life expectancy of stability, welcomed by users. B20A type air blower uses compressed air as power source, which is used to screw screw nuts M18 ~ 22. It is especially suitable for assembling assembly line of automobiles, tractors, internal combustion engines and locomotives. Using the wind trigger than manual screwing can improve work efficiency 3 to 16 times, and can ensure the assembly quality, reduce labor intensity.