无公差 meaning in English

zero allowance

Preparation of drawings for optical elements and systems - part 11 : non - toleranced data
光学元件和系统图的绘制.第11部分:无公差的数据
Permissible deviations in dimensions without tolerance indication for metallic sintered products
无公差指示的金属烧结产品的尺寸允许偏差
Optics and optical instruments - preparation of drawings for optical elements and systems - non - toleranced data
光学及光学仪器.光学元件和系统图纸的制备.第11部分:无公差数据