Radial Internal Clearance (C2–C5)
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Ball Bearings Angular Contact Ball Bearings Self-Aligning Ball Bearings Cylindrical Roller Bearings Tapered Roller Bearings Spherical Roller Bearings Needle Roller Bearings Thrust Bearings Insert Bearings & Housed Units Linear Motion Bearings Plain & Spherical Plain Bearings Bearing Accessories Precision Balls Engineering 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 sides 2RS — contact rubber seals both sides 2RZ — non-contact seals both sides RS — one contact seal Z — one metal shield N — snap ring groove in the outer ring NR — snap ring groove and snap ring Sealed for life (greased, non-relubricatable) Bore & locking type
No preference
Cylindrical bore (plain) Tapered bore 1:12 Tapered bore 1:30 Setscrew locking (insert bearings) Eccentric locking collar Adapter sleeve (H / HE) Withdrawal sleeve (AH / AHX) Flanged outer ring Press fit into housing Internal clearance
No preference
C2 — less than normal, for tight running accuracy and low noise CN — normal, the standard choice for a steady load and ambient temperature C3 — greater than normal, for interference fits, thermal gradient or high speed C4 — greater than C3, for heavy interference fits or a large temperature difference across the rings C5 — greatest, for extreme thermal gradient or heavily deformed housings Tolerance class
No preference
P0 — normal class (ABEC 1), general industrial use P6 — closer than normal (ABEC 3) P5 — precision (ABEC 5), machine tool and electric motor duty P4 — high precision (ABEC 7), spindle duty P2 — ultra precision (ABEC 9) Cage material
No preference
Pressed steel cage Machined brass cage Polyamide PA66 cage (glass reinforced) PEEK cage (high temperature and speed) Phenolic cage (precision spindle) Full complement (no cage)
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