Generally, the initials of grade names are used, such as common grade N and precision grade P. Some manufacturers use 1, 2,3,4,5 to indicate the precision from high to low.

1. Radial clearance of upper silver guide rail

There are five types: ZF micro gap) ZO zero gap) Z 1 light preloading) Z2 medium preloading) and Z3 heavy preloading).

2. Industrial machinery

Ordinary precision can meet the requirements. For high precision, H-class is selected, and P-class is commonly used for equipment such as CNC machine tools. Other ultra-precision machine tools are suitable for SP (ultra-precision) and UP (top precision). The latter three grades need harsh installation and use conditions to show their performance.

3. The accuracy grade of guide rail is divided into (walking parallelism, taking guide rail length 100mm as an example).

General grade (unmarked /C)5μm, advanced grade (H)3μm, precision grade (P)2μm, ultra-precision grade (SP) 1.5μm, ultra-ultra-precision grade (up)1μ m.