The permissible values and each part of denitions are shown below.

Accuracy Attribute Definition:
Travel Length——— Thread Length

Nominal Travel———Lead×Thread circle

Cumulative Representative Lead———Nominal travel+C

Actual value—————Curved line

ep——————Permissible value

E —————— Actual average travel-Specified Travel

Vup —————Accumulated reference lead deviation

V300p————Lead deviation in random 300 mm

V2πp ————Lead deviation in random 1 revolution 2π rad
Precision Grade and  Permissible value　
SURELEN precision level ball bar is divided into six grades (C0 ~ C5), and four characteristic items (ep, Vup, V300P, V2πp) to provide the error tolerance.
Ordinary grade (including cold-rolled) ball screw is divided into three grades (C6 ~ C10), with the characteristic item V300p to specify the error tolerance value.
Accumulated reference lead deviation and total relative variation                                                Unit:μm

Variation in random 300mm (（V300p)和 22π Variation（V 22πp)                                            Umnit:μm