Precision Balls

Category Select a category Ball BearingsAngular Contact Ball BearingsSelf-Aligning Ball BearingsCylindrical Roller BearingsTapered Roller BearingsSpherical Roller BearingsNeedle Roller BearingsThrust BearingsInsert Bearings & Housed UnitsLinear Motion BearingsPlain & Spherical Plain BearingsBearing AccessoriesPrecision BallsEngineering Reference Type Any type Standard Any standard ISO (international)DIN (German)GB/T (Chinese national)AISI / SAE (steel grades)ABMA / ANSI (American)ASTM (materials) Bore diameter (mm) Material No preference Bearing steel (GCr15 / 100Cr6 / SAE 52100)Carburizing steel (20CrMnTi / SAE 8620)Stainless steel 440C (hardened, corrosion resistant)Stainless steel 304 (non-hardenable, wash-down parts)Stainless steel 420 (hardenable, moderate corrosion resistance)Ceramic — silicon nitride (Si3N4)Ceramic — zirconia (ZrO2)Hybrid ceramic (steel rings, ceramic balls)Bronze (cast / wrapped bushings)Sintered bronze (oil impregnated)PTFE composite (dry running liner)Cast iron (housings)Polymer (plastic bushings and rings) Seals / shields No preference Open (no seal or shield)ZZ — metal shields both sides2RS — contact rubber seals both sides2RZ — non-contact seals both sidesRS — one contact sealZ — one metal shieldN — snap ring groove in the outer ringNR — snap ring groove and snap ringSealed for life (greased, non-relubricatable) Bore & locking type No preference Cylindrical bore (plain)Tapered bore 1:12Tapered bore 1:30Setscrew locking (insert bearings)Eccentric locking collarAdapter sleeve (H / HE)Withdrawal sleeve (AH / AHX)Flanged outer ringPress fit into housing Internal clearance No preference C2 — less than normal, for tight running accuracy and low noiseCN — normal, the standard choice for a steady load and ambient temperatureC3 — greater than normal, for interference fits, thermal gradient or high speedC4 — greater than C3, for heavy interference fits or a large temperature difference across the ringsC5 — greatest, for extreme thermal gradient or heavily deformed housings Tolerance class No preference P0 — normal class (ABEC 1), general industrial useP6 — closer than normal (ABEC 3)P5 — precision (ABEC 5), machine tool and electric motor dutyP4 — high precision (ABEC 7), spindle dutyP2 — ultra precision (ABEC 9) Cage material No preference Pressed steel cageMachined brass cagePolyamide PA66 cage (glass reinforced)PEEK cage (high temperature and speed)Phenolic cage (precision spindle)Full complement (no cage)