基本齿条齿形和模块从0.150 mm到0.700 mm（含0.150 mm）。叶尖直径、节距、齿厚、轮廓、轴向和径向跳动及中心距的公差限值；六齿到十二齿小齿轮的切割器。交叉引用:BS 978:第2BS 2519部分

Basic rack tooth shape and modules from 0.150 mm to 0.700 mm inclusive. Limits of tolerance for tip diameter, pitch, tooth thickness, profile, axial and radial run-out and centre distance; cutters for pinions with from six to twelve teeth.Cross References:BS 978:Part 2BS 2519