Boston Gear 800BR Series helical worm gear drives are heavy duty helical gear drives with long life performance features and simplified maintenance. The 800BR Series comes in double and triple reduction ratios from 8:1 through 900:1 and a maximum 10HP rating. As always, the 800BR Series is available via Reducer Express.Pre-LubricatedYesRatio900:1Max Input HP0.27Fan CooledNoUnit Of Measure ShowEnglishOutput RPM @17501.9Output Shaft StyleHollow O/PProduct Family800BR SERIESExact Gear Ratio885.789Product DescriptionS853BR-T/R RED 900:1 Ratio, No Base, "H" ASSYRated Efficiency58%BaseNo BaseMax Output Torque Cap5099Input Frame SizeNoneInput StyleShaft InputReduction StagesTripleWeight47Motor HP0.25Recommended LubricationKlubersynth UH1 6-460Family Id30,314AGMA Service ClassIOutput Shaft O.D./Bore Size1.375