The accuracy of roundness of the hollow parts can be limited in 0.05mm, and it come up to 11-12 degree of IT standard.

• 大批量生产的钢筋连接套；其成形部位横截面上圆度公差可以达到0.；05mm；成形精度已达到或超过GB1184-80《形状与位置公差未注公差规定》中11-12级精度。