The Eaton cap screw, part number 127551, is a differential bolt used in Eaton and Spicer axle differential applications. This fastener is sold individually (each). It falls under the differential bearing and seal service category, which means it is a common replacement item during axle differential rebuilds and service kit installations. Not sure this is the correct fastener for your axle? Call Pro Gear and Transmission to confirm proper fit before ordering.Interchanges:2719-127551ETN127551SP127551ZBP0127551Spicer EH127551FeaturesGenuine Eaton differential cap screw, part number 127551Sold individually, one cap screw per unit of measureApplies to Eaton and Spicer axle differential service and rebuild applicationsCompatible with axle differential bearing and seal service kit category partsTech SpecsUnit of Measure: Each (sold individually)NMFC Code: 121875-70 – Miscellaneous Truck Parts (includes Transmission and Clutch Parts, Gears, Pumps)Used in these Dana Spicer models40 Series Single Reduction Tandem Drive AxleDS404 / RS404 Tandem Drive AxleDS405 Tandem Drive AxleDSH40 Tandem Drive AxleDSH44 Tandem Drive AxleDSP41 Single Reduction Drive AxleDST40 Tandem Drive AxleDST41 Tandem Drive Axle