Gear Profile and Lead Report by German Gear Grinder

Creating the best high-precision gears with the world's most advanced equipment

Any high-precision machinery and industrial gear product must require precision grinding machineries for manufacturing, and a sound gear unit must rely on standardized teeth and tooth line to achieve a contact rate of over 70% in order to reduce noise during operation. Gear tooth profile and poor tooth line will cause the running gear to produce noise, which leads to serious damage gear and causes cracked or fractured teeth. More seriously, it will damage the machinery and reduce its useful life.

To overcome the difficulties in precision processing of gear, tooth, and tooth line associated with old grinders, "SHIUH CHENG Gear Minute" teamed up with HÖFLER and GLEASON of Germany and introduced the world's most advanced high-precision form grinding equipment and specialized OEM grinding, for the precision of quality, standardization of mating rate, noise reduction, while improving gear precision and useful life.

Gear Precision Comparison Sheet
Country Type Precision Grade
U.S.A. AGMA   16 15 14 13 12 11 10 9 8 7 6
JAPAN JIS       0 1 2 3 4 5 6 7 8
Germany DIN 1 2 3 4 5 6 7 8 9 10 11 12


Commonly Metallic Materials for Precision Gears
Classification Taiwanese Name JIS JIS(Prev.) DIN AISI Heat Treatment
Carburization High Frequency
Carbon Steel Medium-Carbon S45C     1045  
Alloy Steel Green Cross SCM415 SCM21 15CrMo5 4115  
Green Cross SCM420 SCM22 18CrMo4 4118  
Red Cross SCM435 SCM3 34CrMo4 4135  
Red Cross SCM440 SCM4 42CrMo4 4140  
White Cross SNCM220 SNCM22 21NiCrMo2 8620  
Blue Cross SNCM439 SNCM8 40NiCrMo6 4340  
      17CrNiMo6 4820