SALIENT FEATURESCompact sturdy design Total leak-proofness Very low noise level Low heat generation Interchangeability. SELECtION Please review the mounting position chart and speed chart for appropriate selection of Split Casing In-line Helical Gearbox.As duty cycle of the gearbox differs from equipment to equipment, it is imperative for the user to calculate horse - power, output RPM and relevant Service Factor.Thus we have given two ratings of gearboxes in the speed chart, for medium and heavy duty, with service factor of 1.4 and 2 respectively.For light duty the user may, in some cases, obtain gearbox of one smaller size than specified against service factor 1.4, but advisable to consult us, with details.