The maximum backlash for our standard/stock parallel shaft (helical/spur) gearmotors is 3 degrees. The backlash also depends on the number of gear stages and the gearing type. Some of our parallel shaft gearheads use only helical, some use spur and helical, and some use Nylon and steel gear combinations. In general, we cut and finish all our gearing to AGMA 9 specifications, and we typically see a backlash of 1.5 degrees or better in most of our stock products. Bodine also offers planetary BLDC and PMDC gearmotors that have a standard backlash of < 60 arc minutes.