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-LubricatedYesRatio500:1Max Input HP1/2Fan CooledNoUnit Of Measure ShowEnglishOutput RPM @17503.5Output Shaft StyleHollow O/PProduct Family800BR SERIESExact Gear Ratio469.091Product DescriptionSF863BR-T/R RED 500:1 Ratio, No Base, "H" ASSYRated Efficiency62%BaseNo BaseMax Output Torque Cap5573Input Frame SizeB5-56CInput StyleQuillReduction StagesTripleWeight78Motor HP0.5Recommended LubricationKlubersynth UH1 6-460Family Id30,315AGMA Service ClassIOutput Shaft O.D./Bore Size1.5