SDP/SI-StockDriveProductsandSterlingInstrumentmanufacturelongandshort-run,highqualityprecisionpartsandassemblies.MechanicalcomponentsproducedanddistributedatSDP/SIaretimingbelts,pulleys,sprockets,couplings,universaljoints,fasteners,gearmotors,sinteredbearings,precisionballbearings,precisiongears–groundspurgears,helicalgears,mitergears,bevelgears,internalgears,rackandpinionandprecisiongearheads.ForoverfiftyyearsSDP/SIhasbeensupplyingprecisionmechanicalpartstoawidevarietyofaerospace,medicalandcommercialindustries.)