Sterling Instrument's S991HY hollow-shaft right-angle helical gear drives feature built-in keyways
Sterling Instrument's hollow-shaft right-angle helical gear drives feature built-in keyways plus left- or right-hand rotation. Identified as the S991HY Series, the gear drives feature sealed ball bearings; 1:1, 2:1 or 3:2 ratios; and rated speeds up to 1,200 rpm. They are made with an aluminum alloy, hard-anodized case; 1144 steel, hollow-bore shafts; and 4140 heat-treated steel gears. Their hollow-bore sizes range from 5/8 inch to 3/4 inch, and their maximum operating temperature is 200° F.