Operating priorityCommon starting materialsWhat the buyer must confirm
High rolling-contact fatigueAISI 52100 chrome steel, 440C or hybrid ceramicGrade, roundness, hardness, surface integrity, lubrication
Wet or corrosive service316/316L, 304, ceramic, glass or compatible polymerFluid chemistry, temperature, crevice exposure, cleaning
Low weight or floating functionPP, HDPE, POM, nylon or aluminumDensity, buoyancy, moisture absorption, temperature
Electrical insulation / non-magneticSi3N4, Al2O3, ZrO2, glass or polymerDielectric behavior, brittleness, precision, thermal cycling
Severe abrasion / high pressureTungsten carbide or engineered ceramicGrade, binder, fracture risk, seat/contact design
Welding or downstream machiningSoft unhardened low-carbon steelHardness condition, surface cleanliness, corrosion protection